Special full-biodegradable mulching film for rice

Abstract

The invention relates to the technical field of manufacturing of mulching films special for rice, in particular to a full-biodegradable mulching film special for rice, which is prepared by the following steps: S1, preparing zinc oxide antibacterial master batches through a mixing granulation device; the preparation method comprises the following steps: S1-1, adding 20 parts of PBAT into 100-500 parts of DMF, adjusting the temperature to 60-80 DEG C to completely dissolve PBAT, then adding 50-80 parts of zinc oxide in batches, uniformly stirring, dropwise adding 1-10 parts of a KH570 solution, and stirring for 30 minutes to obtain a mixed solution; and S1-2, slowly dropwise adding the mixed solution into a large amount of water, forming particles when the solution is in contact with the water due to the phase separation effect, namely the zinc oxide antibacterial master batch, and drying at 60 DEG C for later use. The degradation period of the mulching film is controllable, the use requirement in the complex rice field environment is met, the weed suppression effect is 97% or above, the use and harm of herbicide are greatly reduced, meanwhile, the designed mixing granulation device can greatly shorten the period and manufacturing difficulty of antibacterial master batch manufacturing, and the production cost is reduced. And great convenience can be provided for users through automatic production.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing special rice mulch films, in particular to a special rice mulch film that is fully biodegradable. Background Art

[0002] According to data from the National Bureau of Statistics, China's rice planting area reached 430 million mu in 2023, making it one of the indispensable food crops in my country. In recent years, rice mulching has attracted the attention of more and more researchers. Mulching can not only prevent the growth of weeds, greatly reduce the use of herbicides, and improve food security, but also save water and reduce weight, and increase the economic value of rice. However, due to the intensification of white pollution, PE mulch cannot be used on a large scale in rice, and due to the high barrier and thermal insulation properties of PE mulch, the temperature under the film may be too high in the early stage of mulching in summer, leading to seedling burns; therefore, mulching rice with biodegradable mulch has broad application prospects.

[0003] However, the degradation cycle of degradable mulch film at this stage is uncontrollable. It is easy to degrade prematurely under the high temperature, high humidity, high ultraviolet and high microbial conditions in the rice fields, resulting in poor weed control effect. In addition, the production of degradable mulch film requires the cooperation of multiple equipment, which further increases the production difficulty and the production cycle, while increasing production costs. Summary of the invention

[0004] The purpose of the present invention is to provide a fully biodegradable mulch film for rice, so as to solve the problems that the degradation cycle of the current degradable mulch film mentioned in the above background technology is uncontrollable, and it is easy to degrade prematurely under the high temperature, high humidity, high ultraviolet and high microbial conditions in the rice field, resulting in poor weed control effect, and the production of the degradable mulch film requires the cooperation of multiple equipment, which further increases the production difficulty and the production cycle, and the production cost increases. Through this scheme, the degradation cycle of the mulch film can be controlled to meet the use requirements in the complex environment of the rice field, and the weed control effect is above 97%. At the same time, it can not only greatly shorten the manufacturing cycle and manufacturing difficulty of zinc oxide antibacterial masterbatch, but also provide users with great convenience through automated production, and also reduce users' production costs.

[0005] To achieve the above object, the present invention provides the following technical solution: A fully biodegradable mulch film for rice, comprising S1: preparing zinc oxide antibacterial masterbatch by a mixing granulation device; S1-1: Add 20 parts of PBAT to 100-500 parts of DMF, adjust the temperature to 60-80 degrees, and dissolve it completely. Then, add 50-80 parts of zinc oxide in batches, stir evenly, and then drop 1-10 parts of KH570 solution, stir for 30 minutes to obtain a mixed solution; S1-2: slowly drop the mixed solution into a large amount of water. Due to phase separation, the solution will form particles when it comes into contact with water, i.e. zinc oxide antibacterial masterbatch, which is dried at 60 degrees for later use; S2: After uniformly stirring the above zinc oxide masterbatch 20-50 parts, PBST 0-60 parts, PBAT 0-60 parts, PPC 0-30 parts, PLA 0-30 parts, PPC-P 0-30 parts, chain extender 0.1-1 parts, anti-hydrolysis agent 0.1-1 parts, antioxidant 0.1-1 parts for 0.5 hours, adding into a twin-screw granulator for extrusion granulation, and obtaining modified fully biodegradable particles after pelletizing; S3: adding the modified fully biodegradable particles into a film blowing machine for film blowing to obtain a fully biodegradable mulch film for rice; The mixing granulation device in the above S1 includes a mixing tank, a forming mechanism and a drying mechanism, one side of the mixing tank is fixedly connected to a dripping box, the bottom end of the dripping box is fixedly connected to a generating box, one side of the generating box is provided with a drying box, and the top of the drying box is connected to the bottom end of the mixing tank through a rotating shaft, a first heating plate is provided in the middle and lower part of the mixing tank, a second heating plate is provided at the bottom of the mixing tank, a first motor is provided at the top of the mixing tank, the interior of the mixing tank is connected to a stirring rod through a bearing, and the top end of the stirring rod passes through the mixing tank and is fixedly connected to the output end of the first motor, one end of the dripping tank is symmetrically connected to a connecting pipe, and one end of the connecting pipe is connected to the bottom end of the mixing tank, and a pipette pump is provided in the middle of the connecting pipe.

[0006] Preferably, the temperature of the twin-screw extruder is 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5, and 170 degrees in zone 6; the temperature of the film blowing machine is 150 degrees in zone 1, 155 degrees in zone 2, 160 degrees in zone 3, 165 degrees in zone 4, 165 degrees in zone 5, and 160 degrees in zone 6.

[0007] Preferably, the top of the mixing tank is connected to a first cover plate via a rotating shaft, the top of the drip box is connected to a second cover plate via a rotating shaft, the top of the drip box is connected to a first electric push rod via a rotating shaft, and the output end of the first electric push rod is connected to one end of the first cover plate via a rotating shaft, so that it is convenient for users to open the first cover plate and then add materials. The control ends of the first heating plate, the second heating plate, the first motor, the first electric push rod and the pipetting pump are all electrically connected to an external power supply through an external switch, so that the device can work automatically.

[0008] Preferably, the forming mechanism includes a dripping hole, a movable groove, a limiting groove, a dripping leakage plate, a limiting block, a second motor and a threaded rod, the bottom end of the dripping box is located at the top end of the generating box, the bottom end of the dripping box is penetrated by a dripping hole, the bottom end of the dripping box is provided with a movable groove, both sides of the movable groove are provided with limiting grooves, the interior of the movable groove is slidably connected with a dripping leakage plate, the interior of the limiting groove is slidably connected with a limiting block, and one side of the limiting block is fixedly connected to the dripping leakage plate, and a second motor is arranged on one side of the dripping box, the output end of the second motor is fixedly connected with a threaded rod, and one end of the threaded rod passes through the dripping box and is connected to one side of the dripping leakage plate by a thread, so that the user can drip the mixed solution into the water in the generating box, thereby facilitating the forming of zinc oxide antibacterial masterbatch, and at the same time, the user controls the opening and closing of the dripping through the second motor and the threaded rod, and controls the dripping acceleration and the size of the formed zinc oxide antibacterial masterbatch by controlling the overlap degree of the dripping hole and the surface pores of the dripping leakage plate.

[0009] Preferably, the inner wall of the bottom end of the drip box is an inverted cone, which is convenient for the concentration of the mixed solution, and the generating box is an inverted cone, which is convenient for the concentration of zinc oxide antibacterial masterbatch and then for its transfer. The pores on the surface of the drip plate correspond to the drip holes respectively, which is convenient for the dripping of the mixed solution.

[0010] Preferably, the control end of the second motor is electrically connected to an external power source via an external switch, so as to facilitate automatic operation of the device.

[0011] Preferably, the drying mechanism includes a transfer pipe, a third motor, a spiral push rod, a first guide plate, a first feed port, an air intake support pipe, a drying drum, a support, a second feed port, a first air pipe, an air nozzle, an air distribution pipe, a second guide plate, a discharge port, a baffle, a second electric push rod, a first positioning sensor, a second positioning sensor, an air intake hose, a hot air blower, a third electric push rod, a fourth motor, a rotating part, a rotating groove and a transmission belt. A transfer pipe is provided on one side of the drying box, and the bottom end of the transfer pipe is connected to the bottom end of the generating box, and a third motor is provided at the top of the transfer pipe. The interior of the transfer pipe is connected to the spiral push rod through a bearing, and the top of the spiral push rod The end passes through the transfer pipe and is fixedly connected to the output end of the third motor, the top of the transfer pipe is fixedly connected to the first material guide plate, one end of the drying box is provided with a first feed port, an air intake support pipe is fixed inside the drying box, and one end of the air intake support pipe is located outside the drying box, a drying drum is arranged inside the drying box, and one end of the drying drum is connected to the air intake support pipe through a bearing, the inner wall of one side of the support is fixedly connected to the support, and the middle part of the support is connected to the air intake support pipe through a bearing, a second feed port is arranged on one side of the drying drum, the interior of the drying drum is evenly provided with first air pipes, and one side of the first air pipes are evenly connected There is an air jet nozzle, the other side of the transfer pipe is evenly connected with an air distribution pipe, and the top of the air distribution pipe is connected to the air intake support pipe, one end of the drying box is connected with a second guide plate, one end of the drying drum is provided with a discharge port, one end of the drying drum is connected with a baffle through a rotating shaft, and the baffle blocks the discharge port, one end of the drying drum is connected with a second electric push rod through a rotating shaft, and the output end of the second electric push rod is connected to one side of the baffle through the rotating shaft, a first positioning sensor is provided on one side of the drying box, a second positioning sensor is provided on one side of the drying drum, and the second positioning sensor corresponds to the first positioning sensor, one end of the air intake support pipe An air intake hose is connected through a rotating seal, a hot air blower is arranged on one side of the drying box, and the output end of the hot air blower is connected to one end of the air intake hose, the bottom end of the mixing tank is symmetrically connected to a third electric push rod through a rotating shaft, and the output ends of the third electric push rods are connected to the drying box through the rotating shaft, a fourth motor is arranged on one side of the drying box, and the output end of the fourth motor is fixedly linked to a rotating part, a rotating groove is opened at one end of the drying drum, a transmission belt is arranged at one end of the drying drum, and the inner walls of the transmission belt are respectively fitted with the inner wall of the rotating groove and the surface of the rotating groove, so as to facilitate the user to transfer and dry the zinc oxide antibacterial masterbatch, thereby improving the user's work efficiency.

[0012] Preferably, one end of the first material guide plate extends through the first feed port to the interior of the drying drum, and the air nozzles all face the inner wall of the lower middle part of the drying drum. The first air pipe and the air nozzle form a sixty-degree drying area, which can not only blow high-temperature air evenly to the zinc oxide antibacterial masterbatch, but also improve the drying area and drying efficiency.

[0013] Preferably, the control end of the second electric push rod is electrically connected to the external power supply through the first positioning sensor and the second positioning sensor, and the control ends of the third motor, the hot air blower, the third electric push rod and the fourth motor are all electrically connected to the external power supply through an external switch, so as to facilitate the automatic operation of the device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When the user produces degradable mulch, the zinc oxide antibacterial masterbatch is first manufactured. The user controls the first heating plate and the second heating plate to heat the inside of the mixing tank to 60-80 degrees, opens the first cover plate through the first electric push rod, and then adds 100-500 parts of DMF, and then adds 20 parts of PBAT to 100-500 parts of DMF. At the same time, the first motor drives the stirring rod to rotate, and stirs it through the stirring rod until the PBAT is completely dissolved, and then adds 50-80 parts of zinc oxide in batches. After stirring evenly, 1-10 parts of KH570 solution are added dropwise, and stirred for 30 minutes to obtain a mixed solution. Then the user The mixed solution is transported to the inside of the drip tank through the connecting tube and the pipette pump. After the transport is completed, the user continues to make a mixed solution inside the mixing tank. The user controls the drip plate to move inside the movable groove through the second motor and the threaded rod. At the same time, the movement trajectory of the drip plate is limited by the limit groove and the limit block. After the user aligns the pores of the drip plate with the drip hole through the second motor and the threaded rod, the mixed solution inside the drip tank slowly drips into the clean water inside the generating box through the drip hole. At this time, through the effect of phase separation, the mixed solution can form particles when it comes into contact with water, that is, zinc oxide antibacterial masterbatch. The zinc oxide antibacterial masterbatch enters the interior of the drying drum through the first guide plate for drying under the action of the third motor and the spiral push rod. The output end of the fourth motor drives the rotating part to rotate, and the rotating part drives the drying drum to rotate through the transmission belt. The rotating drying drum can evenly disperse the zinc oxide antibacterial masterbatch inside it. At the same time, the user controls the high-temperature air of 60 degrees generated by the hot air blower. The high-temperature air enters the interior of the drying drum through the air intake hose and the air intake support pipe. The air distribution pipe, the first air pipe and the air nozzle inside the drying drum can evenly blow the high-temperature air onto the evenly dispersed zinc oxide antibacterial masterbatch inside it. , so as to dry it. When the dried zinc oxide antibacterial masterbatch needs to be poured out, the first positioning sensor and the second positioning sensor can align the discharge port on one side of the drying drum with the second guide plate, and the second electric push rod can lift the bottom end of the baffle. At this time, the third electric push rod is used to make the end of the drying box with the second guide plate rotate downward, and the dried zinc oxide antibacterial masterbatch in the drying drum can be poured out. At this time, the zinc oxide antibacterial masterbatch is manufactured, and then the modified fully biodegradable particles are granulated. The above zinc oxide masterbatch 20-50 parts, PBST 0-60 parts, PBAT 0-60 parts, PPC 0-30 parts, PLA 0-30 parts, PPC-P 0-30 parts, chain extender 0.1-1 parts, anti-hydrolysis agent 0.1-1 parts, antioxidant 0.1-1 parts are uniformly stirred 0.After 5 hours, add a twin-screw granulator for extrusion granulation, set the temperature of the twin-screw extruder to 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5, and 170 degrees in zone 6, and finally obtain modified fully biodegradable particles after pelletizing. Add the modified fully biodegradable particles to the film blowing machine for film blowing, and adjust the temperature of the film blowing machine to 150 degrees in zone 1, 155 degrees in zone 2, 160 degrees in zone 3, 165 degrees in zone 4, and 160 degrees in zone 5. 5 degrees, six zones 160 degrees, and finally a fully biodegradable mulch film for rice was obtained. After testing in rice fields, the induction period of this mulch film can reach 50 days. At this time, the rice rows are completely closed and weeds will no longer grow in the later stage. No herbicides or manual weeding are required throughout the process. The weed suppression effect is above 97%, which fully meets the growth needs of rice. The CH4 and N2O emissions of rice fields covered with film were reduced by 39.6% and 38.7% respectively, greatly reducing carbon emissions. Through formula design , so that the degradation cycle of the mulch film can be controlled within 45-60 days, which fully meets the rice row closure cycle, and the effect is above 97%. The CH4 and N2O emissions of the rice fields treated with mulch film are reduced by 39.6% and 38.7% respectively, which greatly reduces carbon emissions and helps achieve the dual carbon goals. The hydrophilicity of the mulch film is increased, which greatly reduces the floating rate of the mulch film when the rice fields are flooded, greatly reducing the death of seedlings caused by floating mulch film. Zinc oxide can play the role of UV shielding, antibacterial and increasing the hydrophilicity of the film, so that the induction period of the mulch film is extended and the hydrophilicity is increased. The degradation cycle of the mulch film in the present invention is controllable, which meets the use requirements in the complex environment of the rice field. The weed suppression effect is above 97%, which greatly reduces the use and harm of herbicides. At the same time, the designed mixing granulation device can not only greatly shorten the cycle and difficulty of manufacturing antibacterial masterbatch, but also provide users with great convenience through automated production, and can also reduce the production cost of users. . BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 It is a cross-sectional perspective schematic diagram of the present invention; Figure 3 It is a cross-sectional perspective schematic diagram of the mixing tank, the dripping tank and the movable tank in the present invention; Figure 4 It is a cross-sectional stereoscopic schematic diagram of the movable groove and the limiting groove in the present invention; Figure 5 It is a cross-sectional stereoscopic schematic diagram of the generating box and the transfer pipe in the present invention; Figure 6 It is a cross-sectional perspective schematic diagram of the first heating plate and the drying drum in the present invention; Figure 7 is a three-dimensional schematic diagram of the fourth motor and the baffle in the present invention; Figure 8This is an experimental comparison diagram of unfilm-covered rice and film-covered rice in the present invention.

[0016] In the figure: 1, mixing tank; 2, dripping box; 3, generating box; 4, drying box; 5, first heating plate; 6, second heating plate; 7, first motor; 8, stirring rod; 9, first cover plate; 10, first electric push rod; 11, second cover plate; 12, connecting pipe; 13, transfer pump; 14, movable groove; 15, limit groove; 16, dripping leakage plate; 17, limit block; 18, second motor; 19, threaded rod; 20, transfer tube; 21, third motor; 22, spiral push material leakage rod; 23, first guide plate; 2 4. First feed port; 25. Air intake support pipe; 26. Drying drum; 27. Support member; 28. Second feed port; 29. ​​First air pipe; 30. Air nozzle; 31. Air distribution pipe; 32. Second guide plate; 33. Discharge port; 34. Baffle; 35. Second electric push rod; 36. First positioning sensor; 37. Second positioning sensor; 38. Air intake hose; 39. Hot air blower; 40. Third electric push rod; 41. Fourth motor; 42. Rotating member; 43. Rotating groove; 44. Transmission belt; 45. Drip hole. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-Figure 8 , an embodiment provided by the present invention: A fully biodegradable mulch film for rice, comprising S1: preparing zinc oxide antibacterial masterbatch by a mixing granulation device; S1-1: Add 20 parts of PBAT to 100-500 parts of DMF, adjust the temperature to 60-80 degrees, and dissolve it completely. Then, add 50-80 parts of zinc oxide in batches, stir evenly, and then drop 1-10 parts of KH570 solution, stir for 30 minutes to obtain a mixed solution; S1-2: slowly drop the mixed solution into a large amount of water. Due to phase separation, the solution will form particles when it comes into contact with water, i.e. zinc oxide antibacterial masterbatch, which is dried at 60 degrees for later use; S2: After uniformly stirring the above zinc oxide masterbatch 20-50 parts, PBST 0-60 parts, PBAT 0-60 parts, PPC 0-30 parts, PLA 0-30 parts, PPC-P 0-30 parts, chain extender 0.1-1 parts, anti-hydrolysis agent 0.1-1 parts, antioxidant 0.1-1 parts for 0.5 hours, adding into a twin-screw granulator for extrusion granulation, and obtaining modified fully biodegradable particles after pelletizing; S3: adding the modified fully biodegradable particles into a film blowing machine for film blowing to obtain a fully biodegradable mulch film for rice; The mixing granulation device in the above S1 includes a mixing tank 1, a forming mechanism and a drying mechanism, a dripping box 2 is fixedly connected to one side of the mixing tank 1, a generating box 3 is fixedly connected to the bottom end of the dripping box 2, a drying box 4 is arranged on one side of the generating box 3, and the top of the drying box 4 is connected to the bottom end of the mixing tank 1 through a rotating shaft, a first heating plate 5 is arranged in the middle and lower part of the mixing tank 1, a second heating plate 6 is arranged at the bottom of the mixing tank 1, a first motor 7 is arranged at the top of the mixing tank 1, a stirring rod 8 is connected to the inside of the mixing tank 1 through a bearing, and the top end of the stirring rod 8 passes through the mixing tank 1 and is fixedly connected to the output end of the first motor 7, one end of the dripping box 2 is symmetrically connected to a connecting pipe 12, and one end of the connecting pipe 12 is connected to the bottom end of the mixing tank 1, and a transfer pump 13 is arranged in the middle of the connecting pipe 12; See also Figure 2 and Figure 3 In this embodiment, the top of the mixing tank 1 is connected to the first cover plate 9 through a rotating shaft, the top of the drip box 2 is connected to the second cover plate 11 through a rotating shaft, the top of the drip box 2 is connected to the first electric push rod 10 through a rotating shaft, and the output end of the first electric push rod 10 is connected to one end of the first cover plate 9 through a rotating shaft. The user controls the output end of the first electric push rod 10 to extend, and the output end of the first electric push rod 10 can lift one end of the first cover plate 9, so that it is convenient for the user to open the first cover plate 9, and then it is convenient for the user to add materials. The control ends of the first heating plate 5, the second heating plate 6, the first motor 7, the first electric push rod 10 and the transfer pump 13 are all electrically connected to the external power supply through an external switch, so that the device can work automatically; See also Figure 2-Figure 5In this embodiment, the forming mechanism includes a dripping hole 45, a movable groove 14, a limiting groove 15, a dripping plate 16, a limiting block 17, a second motor 18 and a threaded rod 19. The bottom end of the dripping box 2 is located at the top of the generating box 3. The dripping hole 45 is penetrated through the bottom end of the dripping box 2. The movable groove 14 is provided at the bottom end of the dripping box 2. Both sides of the movable groove 14 are provided with limiting grooves 15. The inside of the movable groove 14 is slidably connected with the dripping plate 16. The inside of the limiting groove 15 is slidably connected with the limiting block 17, and one side of the limiting block 17 is fixedly connected to the dripping plate 16. A second motor 18 is provided on one side of the dripping box 2. The output end of the second motor 18 is fixedly connected with the threaded rod 19, and one end of the threaded rod 19 passes through the dripping box 2 and is connected to one side of the dripping plate 16 by a thread. The output end of the second motor 18 drives the threaded rod 19 to rotate, and the rotating threaded rod 19 can make the dripping plate 16 move inside the movable groove 14. At the same time, the dripping plate 16 drives the two groups of limit blocks 17 to slide inside the limit groove 15. The limit groove 15 and the limit block 17 can limit the moving trajectory of the dripping plate 16, thereby ensuring the stability and accuracy of the movement of the dripping plate 16. After the user aligns the pores of the dripping plate 16 with the dripping hole 45 through the second motor 18 and the threaded rod 19, the mixed solution inside the dripping box 2 slowly drips into the clean water inside the generating box 3 through the dripping hole 45. At this time, through the effect of phase separation, the mixed solution can form particles when it contacts water, that is, zinc oxide antibacterial masterbatch, which is convenient for the user to drop the mixed solution into the water of the generating box 3, thereby facilitating the formation of zinc oxide antibacterial masterbatch. At the same time, the user controls the opening and closing of the dripping through the second motor 18 and the threaded rod 19, and controls the overlap of the dripping hole 45 and the pores on the surface of the dripping plate 16 to control the dripping acceleration and the size of the zinc oxide antibacterial masterbatch. See also Figure 2 , Figure 5 , Figure 6 and Figure 7In this embodiment, the drying mechanism includes a transfer pipe 20, a third motor 21, a spiral push rod 22, a first guide plate 23, a first feed port 24, an air intake support pipe 25, a drying drum 26, a support member 27, a second feed port 28, a first air pipe 29, an air nozzle 30, an air distribution pipe 31, a second guide plate 32, a discharge port 33, a baffle 34, a second electric push rod 35, a first positioning sensor 36, a second positioning sensor 37, an air intake hose 38, a hot air blower 39, a third electric push rod 40, a fourth motor 41, a rotating member 42, a rotating groove 43 and a transmission belt 44. A transfer pipe 20 is provided on one side of the drying box 4, and the bottom end of the transfer pipe 20 is connected to the bottom end of the generating box 3. The top of the transfer pipe 20 is provided with a third motor 21. The rotating member 42 is connected to the bottom end of the generating box 3. The interior of the transfer tube 20 is connected with a spiral push rod 22 through a bearing, and the top of the spiral push rod 22 passes through the transfer tube 20 and is fixedly connected to the output end of the third motor 21. The top of the transfer tube 20 is fixedly connected with a first guide plate 23. One end of the drying box 4 is provided with a first feed port 24. An air intake support pipe 25 is fixed inside the drying box 4, and one end of the air intake support pipe 25 is located outside the drying box 4. A drying drum 26 is arranged inside the drying box 4, and one end of the drying drum 26 is connected to the air intake support pipe 25 through a bearing. The inner wall of one side of the support member 27 is fixedly connected with the support member 27, and the middle part of the support member 27 is connected to the air intake support pipe 25 through a bearing. A second feed port 28 is provided on one side of the drying drum 26. The inside of the drum 26 is evenly provided with a first air pipe 29, one side of the first air pipe 29 is evenly connected with an air nozzle 30, the other side of the transfer pipe 20 is evenly connected with an air distribution pipe 31, and the top of the air distribution pipe 31 is connected to the air intake support pipe 25, one end of the drying box 4 is connected with a second guide plate 32, one end of the drying drum 26 is provided with a discharge port 33, one end of the drying drum 26 is connected with a baffle 34 through a rotating shaft, and the baffle 34 blocks the discharge port 33, one end of the drying drum 26 is connected with a second electric push rod 35 through a rotating shaft, and the output end of the second electric push rod 35 is connected to one side of the baffle 34 through the rotating shaft, one side of the drying box 4 is provided with a first positioning sensor 36, and one side of the drying drum 26 is provided with a second positioning sensor 3 7, and the second positioning sensor 37 corresponds to the first positioning sensor 36, one end of the intake support pipe 25 is connected to the intake hose 38 through a rotating seal, a hot air blower 39 is provided on one side of the drying box 4, and the output end of the hot air blower 39 is connected to one end of the intake hose 38, the bottom end of the mixing tank 1 is symmetrically connected to the third electric push rod 40 through a rotating shaft, and the output ends of the third electric push rod 40 are all connected to the drying box 4 through the rotating shaft, a fourth motor 41 is provided on one side of the drying box 4, the output end of the fourth motor 41 is fixedly linked to the rotating part 42, a rotating groove 43 is opened at one end of the drying drum 26, a transmission belt 44 is provided at one end of the drying drum 26, and the inner walls of the transmission belt 44 are respectively in contact with the inner wall of the rotating groove 43 and the surface of the rotating groove 43,The zinc oxide antibacterial masterbatch is deposited at the lowest end of the generating box 3, and the output end of the third motor 21 drives the spiral push rod 22 to rotate. At this time, the zinc oxide antibacterial masterbatch enters the interior of the drying drum 26 through the first guide plate 23 under the action of the third motor 21 and the spiral push rod 22 for drying. The output end of the fourth motor 41 drives the rotating part 42 to rotate, and the rotating part 42 drives the drying drum 26 to rotate through the transmission belt 44. The zinc oxide antibacterial masterbatch can be evenly dispersed inside the rotating drying drum 26. At the same time, the user controls the high-temperature air of 60 degrees generated by the hot air blower 39. The high-temperature air enters the interior of the drying drum 26 through the air intake hose 38 and the air intake support pipe 25. The high-temperature air enters the interior of the air distribution pipe 31 and the air nozzle 30 through the drying drum 26, and finally can be The high-temperature air is evenly blown onto the zinc oxide antibacterial masterbatch evenly dispersed inside the drying drum 26, so as to dry it. When the dried zinc oxide antibacterial masterbatch needs to be poured out, the first positioning sensor 36 and the second positioning sensor 37 can align the discharge port 33 on one side of the drying drum 26 with the second guide plate 32, and the output end of the second electric push rod 35 is shortened, thereby driving the bottom end of the baffle 34 to rotate. At this time, the bottom end of the baffle 34 can be lifted up by the second electric push rod 35, and the end of the drying box 4 with the second guide plate 32 is rotated downward by the third electric push rod 40. At this time, the dried zinc oxide antibacterial masterbatch inside the drying drum 26 can be poured out. At this time, the zinc oxide antibacterial masterbatch manufacturing is completed, which is convenient for users to transfer and dry the zinc oxide antibacterial masterbatch, thereby improving the user's work efficiency; It should be noted that the temperature of the twin-screw extruder is 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5, and 170 degrees in zone 6; the temperature of the film blowing machine is 150 degrees in zone 1, 155 degrees in zone 2, 160 degrees in zone 3, 165 degrees in zone 4, 165 degrees in zone 5, and 160 degrees in zone 6; the inner wall at the bottom of the drip tank 2 is an inverted cone, which is convenient for the concentration of the mixed solution; the generating box 3 is an inverted cone, which is convenient for the concentration of the zinc oxide antibacterial masterbatch, and then for its transfer; the pores on the surface of the drip plate 16 correspond to the drip holes 45, respectively, which is convenient for dripping the mixed solution; the control end of the second motor 18 is electrically connected to the external power supply through an external switch, which is convenient for the device To work automatically, one end of the first guide plate 23 passes through the first feed port 24 and extends to the interior of the drying drum 26. The air nozzles 30 all face the inner wall of the lower middle part of the drying drum 26. The first air pipe 29 and the air nozzles 30 form a sixty-degree drying area, which can not only blow high-temperature air evenly to the zinc oxide antibacterial masterbatch, but also improve the drying area and drying efficiency. The control end of the second electric push rod 35 is electrically connected to the external power supply through the first positioning sensor 36 and the second positioning sensor 37. The control ends of the third motor 21, the hot air blower 39, the third electric push rod 40 and the fourth motor 41 are all electrically connected to the external power supply through an external switch, which facilitates the automatic operation of the device.

[0019] See also Figure 8 , Figure 8 The left side is not covered with the fully biodegradable mulch film of the present invention. Figure 8 The right side shows the fully biodegradable mulch film of the present invention. Through the comparison of actual usage, it can be seen that the fully biodegradable mulch film of the present invention was tested in a rice field, and the induction period can reach 50 days. At this time, the rice rows are completely closed, and weeds will not grow in the later stage. There is no need to apply herbicides or manual weeding throughout the process. The weed control effect is above 97%, which fully meets the growth needs of rice. The CH4 and N2O emissions of the rice fields covered with film were reduced by 39.6% and 38.7% respectively, greatly reducing carbon emissions. Through formula design, the mulch film The degradation cycle is controllable within 45-60 days, which fully meets the rice row closure cycle, with an effect of over 97%. The CH4 and N2O emissions from rice fields treated with film were reduced by 39.6% and 38.7% respectively, greatly reducing carbon emissions and contributing to the dual carbon goals. The hydrophilicity of the film is increased, which greatly reduces the floating rate of the film when water is released from the rice field, greatly reducing the death of seedlings caused by floating film. Zinc oxide can play a role in UV shielding, antibacterial, and increasing the hydrophilicity of the film, which prolongs the induction period of the film and increases its hydrophilicity.

[0020] Comparative Example 1 (blank control) 1. After 75 parts of PBAT, 20 parts of PPC, 1 part of chain extender, 2 parts of anti-hydrolysis agent, 1 part of antioxidant and 1 part of carbon black were uniformly stirred for 0.5 hours, they were added into a twin-screw granulator for extrusion granulation. The temperature of the twin-screw extruder was set to 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5 and 170 degrees in zone 6. Fully biodegradable particles were obtained after pelletizing.

[0021] 2. Add the fully biodegradable particles into the film blowing machine for film blowing, and adjust the temperature of the film blowing machine to 150 degrees in zone 1, 155 degrees in zone 2, 160 degrees in zone 3, 165 degrees in zone 4, 165 degrees in zone 5, and 160 degrees in zone 6 to obtain a fully biodegradable mulch film.

[0022] After testing in rice fields, the mulch film had an actual induction period of only 15 days, which was completely unable to meet the growth needs of rice, and weeds would still grow in the later stage.

[0023] Comparative Example 2 (Unmodified Zinc Oxide) 1. After uniformly stirring 15 parts of zinc oxide, 60 parts of PBAT, 20 parts of PPC, 1 part of chain extender, 2 parts of anti-hydrolysis agent, 1 part of antioxidant and 1 part of carbon black for 0.5 hours, add them into a twin-screw granulator for extrusion granulation. Set the temperature of the twin-screw extruder to 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5 and 170 degrees in zone 6. After pelletizing, fully biodegradable particles are obtained.

[0024] 2. Add the fully biodegradable particles into the film blowing machine for film blowing, and adjust the temperature of the film blowing machine to 150 degrees in zone 1, 155 degrees in zone 2, 160 degrees in zone 3, 165 degrees in zone 4, 165 degrees in zone 5, and 160 degrees in zone 6 to obtain a fully biodegradable mulch film.

[0025] The mulch film was tested in rice fields and the actual induction period was only 18 days. Although there was an improvement, it still could not meet the growth needs of rice. This is because the unmodified zinc oxide is not compatible with polyester, which leads to defects inside the mulch film.

[0026] 1. Dissolve 20 parts of PBAT in 500ml DMF at 60 degrees, add 80 parts of zinc oxide and stir evenly, add 5ml KH570 during the period, and then drop the mixed solution into water. Due to phase separation, the solution will form particles when it comes into contact with water, that is, zinc oxide / PBAT composite masterbatch, in which the zinc oxide content is 80%. The particles are dried and set aside.

[0027] 2. After uniformly stirring 20 parts of zinc oxide masterbatch, 65 parts of PBAT, 10 parts of PPC, 1 part of chain extender, 2 parts of anti-hydrolysis agent, 1 part of antioxidant, and 1 part of carbon black for 0.5 hour, add them into a twin-screw granulator for extrusion granulation. Set the temperature of the twin-screw extruder to 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5, and 170 degrees in zone 6. After pelletizing, the modified fully biodegradable particles are obtained.

[0028] 3. Add the modified fully biodegradable particles into a film blowing machine for film blowing, and adjust the temperature of the film blowing machine to 150 degrees in zone 1, 155 degrees in zone 2, 160 degrees in zone 3, 165 degrees in zone 4, 165 degrees in zone 5, and 160 degrees in zone 6 to obtain a fully biodegradable mulch film for rice.

[0029] The solution method for preparing zinc oxide masterbatch not only makes it evenly dispersed, but also has a better modification effect. Zinc oxide can have a certain antibacterial effect, preventing rice field microorganisms from eroding the mulch film prematurely, thereby extending the induction period of the mulch film to meet the growth needs of rice.

[0030] When the user produces degradable mulch, the antibacterial zinc oxide masterbatch is first manufactured. The user controls the first heating plate 5 and the second heating plate 6 to heat the interior of the mixing tank 1 to 60-80 degrees, opens the first cover plate 9 through the first electric push rod 10, and then adds 100-500 parts of DMF, and then adds 20 parts of PBAT to 100-500 parts of DMF. At the same time, the first motor 7 drives the stirring rod 8 to rotate, and stirs it through the stirring rod 8 until the PBAT is completely dissolved, and then adds 50-80 parts of zinc oxide in batches. After stirring evenly, 1-10 parts of KH570 solution are added dropwise, stirred for 30 minutes, and a mixed solution is obtained. Then, the user transports the mixed solution to the drip tank 2 through the connecting tube 12 and the pipette pump 13. After the delivery is completed, the user continues to make a mixed solution inside the mixing tank 1, and the output end of the second motor 18 drives the threaded rod 19 to rotate. The rotating threaded rod 19 can make the dripping plate 16 move inside the movable groove 14, and at the same time, the dripping plate 16 drives the two sets of limit blocks 17 to slide inside the limit groove 15. The limit groove 15 and the limit block 17 can limit the movement trajectory of the dripping plate 16, thereby ensuring the stability and accuracy of the movement of the dripping plate 16. After the user aligns the pores of the dripping plate 16 with the dripping hole 45 through the second motor 18 and the threaded rod 19, the mixed solution inside the dripping box 2 slowly drips into the clean water inside the generating box 3 through the dripping hole 45. At this time Through the effect of phase separation, the mixed solution can form particles when it contacts water, that is, zinc oxide antibacterial masterbatch. The zinc oxide antibacterial masterbatch precipitates downward in the water and is finally deposited at the lowest end of the generating box 3. The output end of the third motor 21 drives the spiral push rod 22 to rotate. At this time, the zinc oxide antibacterial masterbatch enters the interior of the drying drum 26 through the first guide plate 23 under the action of the third motor 21 and the spiral push rod 22 for drying. The output end of the fourth motor 41 drives the rotating part 42 to rotate, and the rotating part 42 drives the drying drum 26 to rotate through the transmission belt 44. The rotating drying drum 26 can make the zinc oxide antibacterial masterbatch evenly dispersed therein. At the same time, the user controls the 6 The high-temperature air of 0 degrees enters the interior of the drying drum 26 through the air intake hose 38 and the air intake support pipe 25, and the high-temperature air enters the interior of the air distribution pipe 31 and the air nozzle 30 through the drying drum 26. Finally, the high-temperature air can be evenly blown onto the zinc oxide antibacterial masterbatch evenly dispersed inside the drying drum 26 through the air nozzle 30, so as to dry it. When the dried zinc oxide antibacterial masterbatch needs to be poured out, the first positioning sensor 36 and the second positioning sensor 37 can make the discharge port 33 on one side of the drying drum 26 aligned with the second guide plate 32, and the output end of the second electric push rod 35 is shortened, thereby driving the bottom end of the baffle 34 to rotate. At this time, the bottom end of the baffle 34 can be lifted up by the second electric push rod 35.The third electric push rod 40 is used to make the end of the drying box 4 with the second guide plate 32 rotate downward, and the dried zinc oxide antibacterial masterbatch in the drying drum 26 can be poured out. At this time, the zinc oxide antibacterial masterbatch is manufactured, and then the modified fully biodegradable particles are granulated. 20-50 parts of the zinc oxide masterbatch, 0-60 parts of PBST, 0-60 parts of PBAT, 0-30 parts of PPC, 0-30 parts of PLA, PPC-P 0.1-1 part of chain extender, 0.1-1 part of anti-hydrolysis agent, 0.1-1 part of antioxidant, after uniform stirring for 0.5 hour, add into a twin-screw granulator for extrusion granulation, set the temperature of the twin-screw extruder to 160 degrees in zone 1, 165 degrees in zone 2, 170 degrees in zone 3, 180 degrees in zone 4, 180 degrees in zone 5, 170 degrees in zone 6, finally obtain modified fully biodegradable particles through pelletizing, add the modified fully biodegradable particles into a film blowing machine for film blowing, and adjust the temperature of the film blowing machine to Zone 1 is 150 degrees, zone 2 is 155 degrees, zone 3 is 160 degrees, zone 4 is 165 degrees, zone 5 is 165 degrees, and zone 6 is 160 degrees. Finally, a fully biodegradable mulch film for rice is obtained. After testing in rice fields, the induction period can reach 50 days. At this time, the rice rows are completely closed and weeds will no longer grow in the later stage. There is no need to apply herbicides or manual weeding throughout the process. The weed suppression effect is above 97%, which fully meets the growth needs of rice. The CH4 and N2O emissions of rice fields covered with film were reduced by 39.6% respectively. and 38.7%, greatly reducing carbon emissions. Through formula design, the degradation cycle of the mulch film can be controlled within 45-60 days, which fully meets the rice row closure cycle, with an effect of more than 97%. The CH4 and N2O emissions of the rice fields treated with mulch film were reduced by 39.6% and 38.7% respectively, greatly reducing carbon emissions and contributing to the dual carbon goals. The hydrophilicity of the mulch film is increased, which greatly reduces the floating rate of the mulch film when the rice fields are released, greatly reducing the death of seedlings caused by the floating of the mulch film. Zinc oxide can play the role of UV shielding, antibacterial and increasing the hydrophilicity of the film, which prolongs the induction period of the mulch film and increases the hydrophilicity. The degradation cycle of the mulch film in the present invention is controllable, meeting the use requirements in the complex environment of the rice field. The weed suppression effect is more than 97%, which greatly reduces the use and harm of herbicides. At the same time, the designed mixing granulation device can not only greatly shorten the cycle and difficulty of manufacturing antibacterial masterbatch, but also provide users with great convenience through automated production, and can also reduce the production cost of users. ,

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention, including replacement of antibacterial materials, polyester materials, and granulation methods. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A fully biodegradable mulch film for rice, characterized in that: The following steps are involved: S1: Preparation of zinc oxide antibacterial masterbatch by mixing and granulating device; S1-1: Add 20 parts of PBAT to 100-500 parts of DMF, adjust the temperature to 60-80 degrees, and dissolve it completely. Then, add 50-80 parts of zinc oxide in batches, stir evenly, and then drop 1-10 parts of KH570 solution, stir for 30 minutes to obtain a mixed solution; S1-2: slowly drop the mixed solution into a large amount of water. Due to phase separation, the solution will form particles when it comes into contact with water, i.e. zinc oxide antibacterial masterbatch, which is dried at 60 degrees for later use; S2: After uniformly stirring the above zinc oxide masterbatch 20-50 parts, PBST 0-60 parts, PBAT 0-60 parts, PPC 0-30 parts, PLA 0-30 parts, PPC-P 0-30 parts, chain extender 0.1-1 parts, anti-hydrolysis agent 0.1-1 parts, antioxidant 0.1-1 parts for 0.5 hours, adding into a twin-screw granulator for extrusion granulation, and obtaining modified fully biodegradable particles after pelletizing; S3: adding the modified fully biodegradable particles into a film blowing machine for film blowing to obtain a fully biodegradable mulch film for rice; The mixing granulation device in the above S1 comprises a mixing tank (1), a forming mechanism and a drying mechanism, wherein a dripping box (2) is fixedly connected to one side of the mixing tank (1), a generating box (3) is fixedly connected to the bottom end of the dripping box (2), a drying box (4) is arranged on one side of the generating box (3), and the top end of the drying box (4) is connected to the bottom end of the mixing tank (1) through a rotating shaft, a first heating plate (5) is arranged at the middle and lower part of the mixing tank (1), a second heating plate (6) is arranged at the bottom of the mixing tank (1), a first motor (7) is arranged at the top end of the mixing tank (1), a stirring rod (8) is connected to the inside of the mixing tank (1) through a bearing, and the top end of the stirring rod (8) passes through the mixing tank (1) and is fixedly connected to the output end of the first motor (7), one end of the dripping tank (2) is symmetrically connected to a connecting pipe (12), and one end of each connecting pipe (12) is connected to the bottom end of the mixing tank (1), and a transfer pump (13) is arranged in the middle of each connecting pipe (12).

2. The fully biodegradable mulch film for rice according to claim 1, characterized in that: The temperature of the twin-screw extruder is 160 degrees in zone one, 165 degrees in zone two, 170 degrees in zone three, 180 degrees in zone four, 180 degrees in zone five, and 170 degrees in zone six; the temperature of the film blowing machine is 150 degrees in zone one, 155 degrees in zone two, 160 degrees in zone three, 165 degrees in zone four, 165 degrees in zone five, and 160 degrees in zone six.

3. The fully biodegradable mulch film for rice according to claim 1, characterized in that: The top of the mixing tank (1) is connected to a first cover plate (9) via a rotating shaft, the top of the dripping box (2) is connected to a second cover plate (11) via a rotating shaft, the top of the dripping box (2) is connected to a first electric push rod (10) via a rotating shaft, and the output end of the first electric push rod (10) is connected to one end of the first cover plate (9) via the rotating shaft, and the control ends of the first heating plate (5), the second heating plate (6), the first motor (7), the first electric push rod (10) and the transfer pump (13) are all electrically connected to an external power supply via an external switch.

4. The fully biodegradable mulch film for rice according to claim 1, characterized in that: The forming mechanism comprises a dripping hole (45), a movable groove (14), a limiting groove (15), a dripping leaking plate (16), a limiting block (17), a second motor (18) and a threaded rod (19); the bottom end of the dripping box (2) is located at the top end of the generating box (3); a dripping hole (45) is provided through the bottom end of the dripping box (2); a movable groove (14) is provided at the bottom end of the dripping box (2); limiting grooves (15) are provided on both sides of the movable groove (14); The groove (14) is slidably connected to a dripping plate (16) inside, the limit groove (15) is slidably connected to a limit block (17) inside, and one side of the limit block (17) is fixedly connected to the dripping plate (16), and a second motor (18) is provided on one side of the dripping box (2), and a threaded rod (19) is fixedly connected to the output end of the second motor (18), and one end of the threaded rod (19) passes through the dripping box (2) and is connected to one side of the dripping plate (16) via a thread.

5. The fully biodegradable mulch film for rice according to claim 4, characterized in that: The inner wall of the bottom end of the drip box (2) is in the shape of an inverted cone, the generating box (3) is in the shape of an inverted cone, and the pores on the surface of the drip plate (16) respectively correspond to the drip holes (45).

6. The fully biodegradable mulch film for rice according to claim 4, characterized in that: The control end of the second motor (18) is electrically connected to an external power source via an external switch.

7. The fully biodegradable mulch film for rice according to claim 1, characterized in that: The drying mechanism comprises a transfer pipe (20), a third motor (21), a spiral material pushing and leaking rod (22), a first material guide plate (23), a first material feed port (24), an air intake support pipe (25), a drying drum (26), a support member (27), a second material feed port (28), a first air pipe (29), an air nozzle (30), an air distribution pipe (31), a second material guide plate (32), a material discharge port (33), a baffle (34), a second electric push rod (35), a first positioning sensor (36), a second positioning sensor (37), an air intake hose (38), a hot air blower (39), a third electric push rod (40), a fourth motor (41), a rotating member (42), a rotating groove (43) and a transmission belt (44). One side of the drying box (4) is provided with A transfer pipe (20) is arranged, and the bottom end of the transfer pipe (20) is connected to the bottom end of the generating box (3); a third motor (21) is arranged at the top end of the transfer pipe (20); a spiral material pushing and leaking rod (22) is connected to the inside of the transfer pipe (20) through a bearing, and the top end of the spiral material pushing and leaking rod (22) passes through the transfer pipe (20) and is fixedly connected to the output end of the third motor (21); a first material guide plate (23) is fixedly connected to the top end of the transfer pipe (20); a first material feed port (24) is opened at one end of the drying box (4); an air intake support pipe (25) is fixed inside the drying box (4), and one end of the air intake support pipe (25) is located outside the drying box (4); a drying drum is arranged inside the drying box (4) (26), and one end of the drying drum (26) is connected to the air intake support pipe (25) through a bearing, the inner wall of one side of the support member (27) is fixedly connected to the support member (27), and the middle part of the support member (27) is connected to the air intake support pipe (25) through a bearing, a second feed port (28) is opened on one side of the drying drum (26), a first air pipe (29) is evenly arranged inside the drying drum (26), one side of the first air pipe (29) is evenly connected to an air nozzle (30), the other side of the transfer pipe (20) is evenly connected to an air distribution pipe (31), and the top end of the air distribution pipe (31) is connected to the air intake support pipe (25), and one end of the drying box (4) is connected to a second guide plate (32). A discharge port (33) is provided at one end of the drying drum (26), a baffle (34) is connected to one end of the drying drum (26) via a rotating shaft, and the baffle (34) blocks the discharge port (33), a second electric push rod (35) is connected to one end of the drying drum (26) via a rotating shaft, and an output end of the second electric push rod (35) is connected to one side of the baffle (34) via a rotating shaft, a first positioning sensor (36) is provided at one side of the drying box (4), a second positioning sensor (37) is provided at one side of the drying drum (26), and the second positioning sensor (37) corresponds to the first positioning sensor (36), and one end of the intake support pipe (25) is connected to an intake hose (38) via a rotating seal,A hot air blower (39) is provided on one side of the drying box (4), and the output end of the hot air blower (39) is connected to one end of an air intake hose (38). The bottom end of the mixing tank (1) is symmetrically connected to a third electric push rod (40) via a rotating shaft, and the output ends of the third electric push rods (40) are connected to the drying box (4) via the rotating shaft. A fourth motor (41) is provided on one side of the drying box (4), and the output end of the fourth motor (41) is fixedly connected to a rotating member (42). A rotating groove (43) is provided at one end of the drying drum (26), and a transmission belt (44) is provided at one end of the drying drum (26), and the inner wall of the transmission belt (44) is respectively in contact with the inner wall of the rotating groove (43) and the surface of the rotating groove (43).

8. The fully biodegradable mulch film for rice according to claim 7, characterized in that: One end of the first material guide plate (23) passes through the first material feed port (24) and extends to the interior of the drying drum (26); the air nozzles (30) all face the inner wall of the lower middle portion of the drying drum (26); and the first air pipe (29) and the air nozzles (30) form a sixty-degree drying area.

9. The fully biodegradable mulch film for rice according to claim 7, characterized in that: The control end of the second electric push rod (35) is electrically connected to an external power source via a first positioning sensor (36) and a second positioning sensor (37), and the control ends of the third motor (21), the hot air blower (39), the third electric push rod (40) and the fourth motor (41) are all electrically connected to an external power source via an external switch.

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