Preparation method of bamboo-based full-biodegradable mulching film

Abstract

The invention relates to the technical field of bamboo-based full-biodegradable mulching films, in particular to a bamboo-based full-biodegradable mulching film preparation method which comprises preparation of bamboo-based full-biodegradable master batches and preparation of a bamboo-based full-biodegradable mulching film. The preparation method of the bamboo-based full-biodegradable master batch comprises the following steps: 1, drying bamboo product wastes at 60-80 DEG C for 6-8 hours, removing residual moisture, and crushing in a crushing device for 1-3 hours until the particle size is 500-1500 meshes for later use; 2, soaking PBAT particles in water, putting the PBAT particles into a drying oven, adjusting the temperature to 60-95 DEG C for 8-72 hours, taking out the particles, drying the particles at 60 DEG C for 12 hours to obtain high-melt-index PBAT particles with the melt index of 30-150 g / 10 min, and uniformly mixing KH570 and ethanol according to the ratio of 1: (1-10) for later use; the bamboo product waste is collected, crushed and modified again and added into the degradable mulching film, so that waste resources can be recycled, the performance of the degradable mulching film is improved, the cost is reduced, and the purpose of replacing plastic with bamboo is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bamboo-based fully biodegradable mulch films, in particular to a method for preparing a bamboo-based fully biodegradable mulch film. Background Art

[0002] Adding bamboo powder as filler to polymer is a common way to use bamboo powder. Degradable mulch has been widely used in recent years. It will be an important way to solve white pollution. By combining bamboo powder with degradable materials to prepare bamboo powder-based fully biodegradable mulch, it will have great application prospects. In the process of bamboo processing, a large amount of scraps will be generated. These scraps not only need to be processed manually, but also cause environmental pollution if they are not handled properly. The existing crushing device has a poor crushing effect when used, resulting in the bamboo product waste being unable to meet subsequent use needs after crushing, thereby increasing the user's use cost and reducing its efficiency. Summary of the invention

[0003] The object of the present invention is to provide a method for preparing a bamboo-based fully biodegradable mulch film, so as to solve the problem proposed in the above-mentioned background technology that a large amount of scraps will be generated during the bamboo processing process. These scraps not only need to be processed manually, but also cause environmental pollution if they are not properly disposed of. The existing crushing device has a poor crushing effect when in use, resulting in that the bamboo product waste cannot meet the subsequent use needs after crushing, thereby increasing the user's use cost and reducing its efficiency. The present scheme can improve the crushing effect of bamboo product waste, and at the same time can also improve the utilization rate of bamboo product waste, and can also avoid the impact of flying dust on the environment and users. At the same time, it can also avoid the splashing of bamboo product waste due to crushing during feeding, and further protect the user. At the same time, the present device can work fully automatically, thereby reducing the user's operating difficulty and improving the user's convenience.

[0004] To achieve the above object, the present invention provides the following technical solutions: a method for preparing a bamboo-based fully biodegradable mulch film, the method comprising preparing a bamboo powder-based fully biodegradable masterbatch and preparing a bamboo powder-based fully biodegradable mulch film; The preparation of the bamboo powder-based fully biodegradable masterbatch comprises: Step 1: Dry the bamboo waste at 60-80 degrees for 6-8 hours to remove residual moisture, and crush it in a crushing device for 1-3 hours to obtain a particle size of 500-1500 mesh for later use; Step 2: Soak the PBAT particles in water, put them in an oven, adjust the temperature to 60-95°C, and dry them for 8-72 hours. Take out the particles and dry them at 60 degrees for 12 hours to obtain high melt index PBAT particles with a melt index of 30-150 g / 10min. Mix KH570 and ethanol at a ratio of 1:1-10 for later use. Step 3: Mix 20 parts of high melt index PBAT particles and 20 parts of bamboo powder and add them to the internal mixer for internal mixing. Adjust the temperature to 140-160 degrees. During this period, add 30-60 parts of bamboo powder in batches, and evenly spray 5-10 parts of KH570 ethanol mixed solution. After internal mixing for 1-3 hours, a block material is obtained. The block material is added to a double cone strong feeding extruder for extrusion granulation. The temperature is set to 140-160 degrees to obtain a bamboo powder-based fully biodegradable masterbatch for standby use; The preparation of the bamboo powder-based fully biodegradable mulch film comprises: Step 1: Take 10-50 parts of bamboo powder and treat it in a plasma surface treatment machine for 0.1-2 hours, stirring the bamboo powder every 1 minute to make the bamboo powder modified evenly; Step 2: After bamboo powder is modified, it is quickly mixed with 0-60 parts of PBST, 0-60 parts of PBAT, 0-30 parts of PPC, 0-30 parts of PLA, 0-30 parts of PPC-P, 0.1-1 parts of chain extender, 0.1-1 parts of anti-hydrolysis agent, and 0.1-1 parts of antioxidant, and uniformly stirred for 0.5 hours, and then added into a twin-screw granulator for extrusion granulation; Step 3: Setting 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 obtaining bamboo powder-based fully biodegradable particles through pelletizing; Step 4: Add the bamboo powder-based 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 bamboo powder-based fully biodegradable mulch film.

[0005] Preferably, the crushing device includes a screening box, a feeding auxiliary mechanism, a screening mechanism, a waste circulation mechanism and a negative pressure dust suction mechanism, the bottom end of the screening box is fixedly connected to a crushing box, one end of the screening box is fixedly connected to an auxiliary box, the other end of the screening box is fixedly connected to a transfer box, the bottom end of the crushing box is connected to a solenoid valve, and the top of the solenoid valve is located inside the screening box, a positioning groove is provided on the inner wall of the bottom end of the crushing box, a transmission groove is provided in the middle of the crushing box, a collecting ring is slidably connected to the inside of the crushing box, and the bottom end of the collecting ring is slidably connected to the positioning groove, a first motor is provided at one end of the transmission groove, a first gear is fixedly connected to the output end of the first motor, a second gear is fixedly connected to the middle of the collecting ring, and the second gear is meshed with the first gear, a collecting plate is evenly fixedly connected to the inside of the collecting ring, and the angle between the collecting plate and the inner wall of the collecting ring is ten degrees, a crusher is provided in the middle of the crushing box, and both ends of the crusher are connected to the inner wall of the crushing box through bearings.

[0006] Preferably, the control ends of the solenoid valve, the first motor and the crusher are all electrically connected to an external power source through an external switch, so as to facilitate the operation of the device.

[0007] Preferably, the feeding auxiliary mechanism comprises a raw material trough, a blanking trough, a first material channel, a material tray, a power bin, a pushing roller, a third gear, a toothed belt, a fourth gear, a second motor, a cutter, an electric push rod, a guide groove, a guide rod and a first spring. A raw material trough is provided at the middle and upper part of the auxiliary box, a blanking trough is provided at one end of the raw material trough, the other end of the raw material trough is fixedly connected to the material tray, one end of the blanking trough is connected to the first material channel, and one end of the first material channel is connected to the top of the crushing box, and the end of the first material channel connected to the crushing box is lower than the other end, a power bin is provided on one side of the raw material trough, and the inner walls of the upper and lower ends of the raw material trough are evenly connected with four groups of pushing rollers through bearings, and one end of the pushing rollers is connected to the inner wall of the power bin through bearings, and one end of the pushing rollers is fixedly connected to the third gear, and two groups of toothed belts are arranged inside the power bin, and the inner walls of the toothed belts are respectively meshed with the third gear, and the two groups of One end of the pushing roller is fixedly connected with a fourth gear, and the fourth gears are meshed with each other. A second motor is arranged inside the power bin, and an output end of the second motor is fixedly connected to one end of a group of pushing rollers. A cutting knife is slidably connected to the top of the blanking trough, and one side of the cutter fits with one end of the raw material trough. Three groups of electric push rods are evenly arranged on the inner wall of the top of the blanking trough, and the output ends of the electric push rods are fixedly connected to the top of the cutter. Guide grooves are provided on both sides of the inner wall of the bottom end of the blanking trough, and guide rods are slidably connected to the inside of the guide grooves, and the tops of the guide rods are fixedly connected to the cutters, and the bottom ends of the guide rods are fixedly connected to the first springs, and the bottom ends of the first springs are respectively fixedly connected to the inner walls of the guide grooves, which is convenient for users to load materials and avoid splashing of bamboo product waste during crushing, while improving crushing efficiency. The control ends of the second motor and the electric push rods are electrically connected to an external power supply through an external switch, which is convenient for the device to work.

[0008] Preferably, the screening mechanism comprises a bulk material plate, a screening piece, a material distribution bin, a sliding plate, a fixed plate, a vibration motor, a guide sleeve, a sliding rod, a second spring and a transfer plate, the top of the screening box is provided with a bulk material plate, the bottom end of the bulk material plate is evenly provided with three groups of screening pieces, the screening piece is provided with a material distribution bin, one end of the material distribution bin is fixedly connected with the sliding plate, the screening box is provided with a fixed plate, and the inner wall of the fixed plate is respectively fixedly connected to the two ends of the bulk material plate and the screening piece, the bottom end of the fixed plate is provided with a vibration motor, the inner walls of the two ends of the screening box are evenly fixedly connected with the guide sleeve, the inside of the guide sleeve is slidably connected with the sliding rod, and one end of the sliding rod is respectively fixedly connected to the two ends of the bulk material plate and the screening piece, one end of the sliding rod is fixedly connected to the second spring, and one end of the second spring is fixedly connected to the inner wall of the guide sleeve, one end of the screening box is fixedly connected with the transfer plate, and one end of the transfer plate is located in the middle of the transfer box, which is convenient for users to screen.

[0009] Preferably, the transfer plate is located at the bottom end of the lowest group of screening members, the bulk plate and the screening member are both inclined, and the inclination angles of the bulk plate and the screening member are symmetrically distributed up and down. One end of the screening member fixedly connected to the sliding plate is lower than one end of its diagonal line, which facilitates the automatic falling of bamboo powder. The control end of the vibration motor is electrically connected to the external power supply through an external switch, which facilitates the operation of the device.

[0010] Preferably, the waste circulation mechanism includes a barrel, a third motor, a spiral push rod and a second material channel. The barrel is arranged in the middle of the transfer box, and the barrel is inclined. The third motor is arranged at the top of the barrel. The inside of the barrel is connected with a spiral push rod through a bearing, and one end of the spiral push rod is fixedly connected to the output end of the third motor. The top of the barrel is connected to the second material channel, and one end of the second material channel is connected to the top of the crushing box. The control end of the third motor is electrically connected to an external power supply through an external switch, so as to improve the utilization rate of bamboo product waste.

[0011] Preferably, the negative pressure dust suction mechanism includes a water tank, an air distribution box, an air intake pipe, a fan, an exhaust pipe and a connecting pipe. A water tank is provided at the bottom end of the auxiliary box, and an air distribution box is arranged inside the water tank. The top of the air distribution box is connected to the air intake pipe, and one end of the air intake pipe passes through the auxiliary box and is connected to the top of the crushing box. One end of the screening box is connected to a connecting pipe, and one end of the connecting pipe is connected to the air intake pipe. A fan is provided in the middle of the auxiliary box, and both ends of the fan are connected to exhaust pipes. The bottom end of a group of exhaust pipes is connected to the water tank, and the control end of the fan is electrically connected to an external power supply through an external switch to avoid environmental pollution caused by flying dust.

[0012] Compared with the prior art, the present invention has the following beneficial effects: First, the user dries the bamboo waste, and then puts the dried bamboo waste into the raw material trough through the material tray. At this time, the output end of the second motor can make the upper and lower four groups of push rollers rotate simultaneously through the fourth gear, the toothed belt and the third gear, and the rotation directions of the push rollers of the two adjacent upper and lower groups are opposite. The push rollers can squeeze the bamboo waste and move it forward. At the same time, the output end of the electric push rod drives the cutter to move downward, and at the same time, the guide rod compresses the first spring. The cutter can shear the bamboo waste moving forward into small pieces, and then drop them into the crushing box through the drop trough and the first material channel. At this time, the high-speed rotating crusher can reduce its crushing, and the bamboo powder is far away under the action of the crusher. The first gear and the second gear drive the collecting ring to rotate, and the collecting ring drives the collecting plate to rotate, and the bamboo powder on the surface of the collecting ring can be moved to the center of the crushing box through the collecting plate, so that the bamboo powder continues to be crushed, thereby improving the crushing effect and making the bamboo powder be crushed more thoroughly. The crushed bamboo powder falls to the top of the bulk material plate through the electromagnetic valve. After the vibration motor is started, the bulk material plate and the screening piece are vibrated through the fixed plate, and the bulk material plate can be evenly discharged through vibration. The bamboo powder is screened through the screening piece, and the screened bamboo powder falls into the interior of the sub-bin and is finally discharged through the sliding plate. The larger particles of bamboo powder are screened again until they finally fall on the top of the transfer plate and are discharged through the transfer plate. The air enters the transfer box, and the output end of the third motor drives the spiral push rod to rotate. The spiral push rod moves the larger bamboo powder to the second material channel and finally enters the crushing box again for crushing, thereby improving the utilization rate of bamboo product waste. During the entire crushing process, the input end of the fan generates negative pressure inside the water tank, and the air is discharged through the top of the exhaust pipe. Due to the negative pressure generated inside the water tank, the air inside the device flows into the water tank through the air inlet pipe and the connecting pipe. The air can be dispersed through the air distribution box, so that the dust and fine particles in the air are precipitated in the liquid inside the water tank, thereby avoiding the generation of flying dust by the device and flowing to the outside, thereby causing pollution and affecting the work of users. The device can improve The crushing effect of bamboo product waste can also improve the utilization rate of bamboo product waste, avoid the impact of flying dust on the environment and users, and avoid the splashing of bamboo product waste due to crushing during feeding, so as to further protect users. At the same time, the device can work fully automatically, thereby reducing the difficulty of user operation and improving the convenience of user use. The bamboo product waste is collected and re-crushed and modified, and added to the degradable mulch film, which can not only reuse the waste resources, but also improve the performance of the degradable mulch film and reduce the cost, and has great application value. At the same time, the preparation method of the bamboo powder masterbatch in the present application is simple, the modification effect is good, and it has extremely high application value. First, a large amount of bamboo powder is added to PBAT to obtain bamboo powder masterbatch.Then, bamboo powder masterbatch is directly used in the subsequent processing to make it disperse well in PBAT and improve its performance, avoiding the problems of uneven dispersion, easy defects, small addition, time-consuming and labor-intensive caused by direct addition of bamboo powder. The surface energy of bamboo powder can be improved through plasma modification, which greatly improves its compatibility with polyester and enhances the performance of polyester. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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 stereoscopic schematic diagram of the screening box, the crushing box and the aggregate ring in the present invention; Figure 4 It is a cross-sectional stereoscopic schematic diagram of the blanking chute, guide chute and gas distribution box in the present invention; Figure 5 It is a cross-sectional stereoscopic schematic diagram of the screening box and the guide sleeve in the present invention; Figure 6 It is a three-dimensional schematic diagram of the bulk material plate, the screening member and the transfer plate in the present invention; Figure 7 It is a cross-sectional stereoscopic schematic diagram of the screening box, the crushing box and the barrel in the present invention.

[0014] In the figure: 1, screening box; 2, crushing box; 3, auxiliary box; 4, transfer box; 5, solenoid valve; 6, positioning groove; 7, transmission groove; 8, collecting ring; 9, first motor; 10, first gear; 11, second gear; 12, collecting plate; 13, crusher; 14, raw material trough; 15, drop trough; 16, first material channel; 17, material tray; 18, power bin; 19, push roller; 20, third gear; 21, toothed belt; 22, fourth gear; 23, second motor; 24, cutter; 2 5. Electric push rod; 26. Guide groove; 27. Guide rod; 28. First spring; 29. ​​Bulk material plate; 30. Screening piece; 31. Material distribution bin; 32. Sliding plate; 33. Fixed plate; 34. Vibration motor; 35. Guide sleeve; 36. Sliding rod; 37. Second spring; 38. Transfer plate; 39. Material barrel; 40. Third motor; 41. Screw push rod; 42. Second material channel; 43. Water tank; 44. Air distribution box; 45. Inlet pipe; 46. Fan; 47. Exhaust pipe; 48. Connecting pipe. DETAILED DESCRIPTION

[0015] 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.

[0016] See also Figure 1-Figure 7 , an embodiment provided by the present invention: A method for preparing a bamboo-based fully biodegradable mulch film, the method comprising preparing a bamboo powder-based fully biodegradable masterbatch and preparing a bamboo powder-based fully biodegradable mulch film; The preparation of bamboo powder-based fully biodegradable masterbatch includes: Step 1: Dry the bamboo waste at 60-80 degrees for 6-8 hours to remove residual moisture, and crush it in a crushing device for 1-3 hours to obtain a particle size of 500-1500 mesh for later use; Step 2: Soak the PBAT particles in water, put them in an oven, adjust the temperature to 60-95°C, and dry them for 8-72 hours. Take out the particles and dry them at 60 degrees for 12 hours to obtain high melt index PBAT particles with a melt index of 30-150 g / 10min. Mix KH570 and ethanol at a ratio of 1:1-10 for later use. Step 3: Mix 20 parts of high melt index PBAT particles and 20 parts of bamboo powder and add them to the internal mixer for internal mixing. Adjust the temperature to 140-160 degrees. During this period, add 30-60 parts of bamboo powder in batches, and evenly spray 5-10 parts of KH570 ethanol mixed solution. After internal mixing for 1-3 hours, a block material is obtained. The block material is added to a double cone strong feeding extruder for extrusion granulation. The temperature is set to 140-160 degrees to obtain a bamboo powder-based fully biodegradable masterbatch for standby use; The preparation of bamboo powder-based fully biodegradable mulch film includes: Step 1: Take 10-50 parts of bamboo powder and treat it in a plasma surface treatment machine for 0.1-2 hours, stirring the bamboo powder every 1 minute to make the bamboo powder modified evenly; Step 2: After bamboo powder is modified, it is quickly mixed with 0-60 parts of PBST, 0-60 parts of PBAT, 0-30 parts of PPC, 0-30 parts of PLA, 0-30 parts of PPC-P, 0.1-1 parts of chain extender, 0.1-1 parts of anti-hydrolysis agent, and 0.1-1 parts of antioxidant, and uniformly stirred for 0.5 hours, and then added into a twin-screw granulator for extrusion granulation; Step 3: Setting 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 obtaining bamboo powder-based fully biodegradable particles through pelletizing; Step 4: Add bamboo powder-based 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 bamboo powder-based fully biodegradable mulch film; Comparative Example 1 (blank sample) After uniformly stirring 79 parts of PBAT, 20 parts of PPC, 0.3 parts of chain extender, 0.3 parts of anti-hydrolysis agent and 0.4 parts of antioxidant for 0.5 hours, they were added into a twin-screw granulator for extrusion granulation. The temperatures of the twin-screw extruder were 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.

[0017] Add 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 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 to obtain a fully biodegradable mulch film.

[0018] The tensile strength of the ground film was tested to be 23MPa and the elongation at break was 451%.

[0019] Comparative Example 2 (unmodified bamboo powder) The bamboo waste was dried at 60 degrees for 8 hours to remove residual moisture, and then crushed in a crushing device for 3 hours to a particle size of 500-1000 mesh.

[0020] After uniformly stirring 20 parts of bamboo powder, 59 parts of PBAT, 20 parts of PPC, 0.3 parts of chain extender, 0.3 parts of anti-hydrolysis agent and 0.4 parts of antioxidant for 0.5 hours, add them into a twin-screw granulator for extrusion granulation. The temperature of the twin-screw extruder is 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. After granulation, bamboo-based fully biodegradable particles are obtained.

[0021] Add bamboo powder-based 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 bamboo-based fully biodegradable mulch film.

[0022] The tensile strength of the mulch film was tested to be 20.7MPa and the elongation at break was 407%. Compared with the blank sample, its mechanical properties were reduced. This was because the unmodified bamboo powder had poor compatibility with polyester, which led to defects inside the mulch film and reduced mechanical properties.

[0023] Embodiment 1

[0024] The bamboo waste was dried at 60 degrees for 8 hours to remove residual moisture, and then crushed in a crushing device for 3 hours to a particle size of 500-1000 mesh.

[0025] Boil PBAT in water at 95 degrees for 24 hours to make its melt index 80 g / 10min, and dry it at 60 degrees for later use. (High melt index has good fluidity, and more powder can be added.) 80 parts of bamboo powder and 20 parts of high melt index PBAT were added to an internal mixer for internal mixing. The temperature was adjusted to 160 degrees. During the mixing, KH570 / ethanol solution was evenly sprayed. The obtained block material was extruded and granulated through a double-cone strong feeding screw machine to obtain a high-content bamboo powder / PBAT masterbatch, in which the bamboo powder content was 80%.

[0026] After uniformly stirring 20 parts of bamboo powder masterbatch, 59 parts of PBAT, 20 parts of PPC-P, 0.3 parts of chain extender, 0.3 parts of anti-hydrolysis agent and 0.4 parts of antioxidant for 0.5 hour, add them into a twin-screw granulator for extrusion granulation. The temperature of the twin-screw extruder is 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. After granulation, bamboo-based fully biodegradable particles are obtained.

[0027] Add bamboo-based 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 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 to obtain a bamboo-based fully biodegradable mulch film.

[0028] The mulch film was tested to have a tensile strength of 28.3MPa and an elongation at break of 536%.

[0029] Embodiment 2

[0030] The bamboo waste was dried at 60 degrees for 8 hours to remove the residual moisture, and then crushed in a crushing device for 3 hours to a particle size of 500-1000 mesh.

[0031] The bamboo powder is plasma modified to improve its surface activity, and 20 parts of modified bamboo powder, 55 parts of PBAT, 20 parts of PPC, 2 parts of chain extender, 2 parts of anti-hydrolysis agent, and 1 part of antioxidant are quickly mixed and granulated through a twin-screw extruder. The temperature of the twin-screw extruder is set to 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. After pelletizing, bamboo-based fully biodegradable particles are obtained.

[0032] Add bamboo-based 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 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 to obtain a bamboo-based fully biodegradable mulch film.

[0033] Compared with traditional mulch films, the tested tensile strength of this mulch film reaches 29.8MPa and the elongation at break reaches 533%, which greatly improves its performance.

[0034] The crushing device includes a screening box 1, a feeding auxiliary mechanism, a screening mechanism, a waste circulation mechanism and a negative pressure dust suction mechanism. The bottom end of the screening box 1 is fixedly connected to a crushing box 2, one end of the screening box 1 is fixedly connected to an auxiliary box 3, the other end of the screening box 1 is fixedly connected to a transfer box 4, the bottom end of the crushing box 2 is connected to an electromagnetic valve 5, and the top of the electromagnetic valve 5 is located inside the screening box 1, the inner wall of the bottom end of the crushing box 2 is provided with a positioning groove 6, the middle part of the crushing box 2 is provided with a transmission groove 7, the inside of the crushing box 2 is slidably connected to an aggregate ring 8, and the aggregate The bottom end of the ring 8 is slidably connected to the positioning groove 6, a first motor 9 is provided at one end of the transmission groove 7, a first gear 10 is fixedly connected to the output end of the first motor 9, a second gear 11 is fixedly connected to the middle of the collecting ring 8, and the second gear 11 is meshed with the first gear 10, a collecting plate 12 is evenly fixedly connected to the inside of the collecting ring 8, and the angle between the collecting plate 12 and the inner wall of the collecting ring 8 is ten degrees, a crusher 13 is provided in the middle of the crushing box 2, and both ends of the crusher 13 are connected to the inner wall of the crushing box 2 through bearings; See also Figure 2 and Figure 4In this embodiment, the feeding auxiliary mechanism includes a raw material trough 14, a blanking trough 15, a first material channel 16, a material tray 17, a power bin 18, a pushing roller 19, a third gear 20, a toothed belt 21, a fourth gear 22, a second motor 23, a cutter 24, an electric push rod 25, a guide groove 26, a guide rod 27 and a first spring 28. A raw material trough 14 is provided in the middle and upper part of the auxiliary box 3, a blanking trough 15 is provided at one end of the raw material trough 14, a material tray 17 is fixedly connected to the other end of the raw material trough 14, a first material channel 16 is connected to one end of the blanking trough 15, and one end of the first material channel 16 is connected to the top of the crushing box 2, and the end of the first material channel 16 connected to the crushing box 2 is lower than the other end, a power bin 18 is provided on one side of the raw material trough 14, and the inner The walls are evenly connected with four groups of push rollers 19 through bearings, and one end of the push rollers 19 is connected to the inner wall of the power bin 18 through bearings, one end of the push rollers 19 is fixedly connected with a third gear 20, two groups of toothed belts 21 are arranged inside the power bin 18, and the inner walls of the toothed belts 21 are respectively meshed with the third gear 20, one end of the two groups of push rollers 19 is fixedly connected with a fourth gear 22, and the fourth gears 22 are meshed with each other, a second motor 23 is arranged inside the power bin 18, and the output end of the second motor 23 is fixedly connected with one end of a group of push rollers 19, a cutter 24 is slidably connected to the top of the blanking trough 15, and one side of the cutter 24 is in contact with one end of the raw material trough 14, three groups of electric push rods 25 are evenly arranged on the inner wall at the top of the blanking trough 15, and The output ends of the electric push rods 25 are fixedly connected to the top of the cutter 24, and guide grooves 26 are provided on both sides of the inner wall of the bottom end of the blanking trough 15. The guide grooves 26 are slidably connected to the inside of the guide grooves 26, and the tops of the guide rods 27 are fixedly connected to the cutter 24, and the bottom ends of the guide rods 27 are fixedly connected to the first springs 28, and the bottom ends of the first springs 28 are respectively fixedly connected to the inner walls of the guide grooves 26. First, the user dries the bamboo waste, and then puts the dried bamboo waste into the raw material trough 14 through the material tray 17. At this time, the output end of the second motor 23 drives a group of fourth gears 22 and a group of push rollers 19 to rotate, and a group of fourth gears 22 drives another group of fourth gears 22 to rotate. At this time, the two groups of fourth gears 22 can make the two groups of push rollers 19 rotates in the opposite direction at the same time, and the two groups of third gears 20 are driven to rotate by the two groups of push rollers 19. The two groups of third gears 20 drive the other three groups of third gears 20 to rotate through the two groups of toothed belts 21 respectively. At this time, the upper and lower four groups of push rollers 19 rotate in the opposite direction at the same time, so that the bamboo waste can be squeezed and moved forward by the push rollers 19. At the same time, the output end of the electric push rod 25 drives the cutter 24 to move downward, and at the same time, the guide rod 27 compresses the first spring 28, and the bamboo waste moving forward can be sheared by the cutter 24 and cut into small pieces. The cutter 24 is reset under the action of the first spring 28's own resilience, and the sheared small pieces of bamboo waste fall into the inside of the crushing box 2 through the drop chute 15 and the first material channel 16.It is convenient for users to load materials, avoid splashing of bamboo waste during crushing, and improve crushing efficiency; See also Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the screening mechanism includes a bulk plate 29, a screening member 30, a material distribution bin 31, a sliding plate 32, a fixed plate 33, a vibration motor 34, a guide sleeve 35, a slide bar 36, a second spring 37 and a transfer plate 38. The top of the screening box 1 is provided with a bulk plate 29, and the bottom of the bulk plate 29 is evenly provided with three groups of screening members 30. The screening members 30 are all provided with a material distribution bin 31, and one end of the material distribution bin 31 is fixedly connected with a sliding plate 32. The screening box 1 A fixing plate 33 is arranged inside, and the inner wall of the fixing plate 33 is fixedly connected to the two ends of the bulk material plate 29 and the screening member 30 respectively, a vibration motor 34 is arranged at the bottom end of the fixing plate 33, the inner wall of the two ends of the screening box 1 is evenly fixedly connected with a guide sleeve 35, the inside of the guide sleeve 35 is slidably connected with a slide rod 36, and one end of the slide rod 36 is fixedly connected to the two ends of the bulk material plate 29 and the screening member 30 respectively, one end of the slide rod 36 is fixedly connected to the second spring 37, and the first One end of the second spring 37 is fixedly connected to the inner wall of the guide sleeve 35, and one end of the screening box 1 is fixedly connected to a transfer plate 38, and one end of the transfer plate 38 is located in the middle of the transfer box 4. The user controls the electromagnetic valve 5 to work, and the crushed bamboo powder can fall to the top of the bulk plate 29 through the electromagnetic valve 5. After the vibration motor 34 is started, the bulk plate 29 and the screening member 30 are vibrated through the fixed plate 33, and the sliding rod 36 can slide inside the guide sleeve 35 through the bulk plate 29 and the screening member 30. The second spring 37 can be continuously compressed and stretched by the sliding rod 36, and the bulk plate 29 can be uniformly discharged through vibration. The bamboo powder is screened through the screening member 30, and the screened bamboo powder falls into the inside of the sub-bin 31, and is finally discharged through the sliding plate 32. The bamboo powder with larger particles is screened again until it finally falls on the top of the transfer plate 38 and enters the inside of the transfer box 4 through the transfer plate 38, which is convenient for the user's screening work; See also Figure 2 and Figure 7In this embodiment, the waste circulation mechanism includes a barrel 39, a third motor 40, a spiral push rod 41 and a second material channel 42. The barrel 39 is arranged in the middle of the transfer box 4, and the barrel 39 is inclined. The third motor 40 is arranged at the top of the barrel 39. The inside of the barrel 39 is connected with a spiral push rod 41 through a bearing, and one end of the spiral push rod 41 is fixedly connected to the output end of the third motor 40. The top of the barrel 39 is connected with the second material channel 42, and one end of the second material channel 42 is connected to the top of the crushing box 2. The control end of the third motor 40 is electrically connected to the external power supply through an external switch. The output end of the third motor 40 drives the spiral push rod 41 to rotate, and the larger particles of bamboo powder are moved to the inside of the second material channel 42 through the spiral push rod 41, and finally enter the inside of the crushing box 2 again for crushing, thereby improving the utilization rate of bamboo product waste; See also Figure 1 , Figure 2 and Figure 4 In this embodiment, the negative pressure dust suction mechanism includes a water tank 43, an air distribution box 44, an air intake pipe 45, a fan 46, an exhaust pipe 47 and a connecting pipe 48. The bottom end of the auxiliary box 3 is provided with a water tank 43, and the inside of the water tank 43 is provided with an air distribution box 44. The top of the air distribution box 44 is connected with an air intake pipe 45, and one end of the air intake pipe 45 passes through the auxiliary box 3 and is connected to the top of the crushing box 2. One end of the screening box 1 is connected with a connecting pipe 48, and one end of the connecting pipe 48 is connected to the air intake pipe 45. A fan 46 is provided in the middle of the auxiliary box 3, and both ends of the fan 46 are connected with exhaust pipes 47. The bottom end of a group of exhaust pipes 47 is connected to the water tank 43. The control end of the fan 46 is electrically connected to the external power supply through an external switch. During the entire crushing process, the input end of the fan 46 generates negative pressure inside the water tank 43, and the air is discharged through the top of the exhaust pipe 47. Since the negative pressure is generated inside the water tank 43, the air inside the device flows into the water tank 43 through the air inlet pipe 45 and the connecting pipe 48. The air can be dispersed through the air distribution box 44, so that the dust and fine particles in the air are precipitated in the liquid inside the water tank 43, thereby preventing the device from generating flying dust that flows to the outside, causing pollution and affecting the work of users, and preventing flying dust from causing environmental pollution; It should be noted that the control ends of the solenoid valve 5, the first motor 9 and the crusher 13 are all electrically connected to the external power supply through an external switch, which is convenient for the operation of the device. The control ends of the second motor 23 and the electric push rod 25 are all electrically connected to the external power supply through an external switch, which is convenient for the operation of the device. The transfer plate 38 is located at the bottom end of the bottom group of screening members 30. The bulk plate 29 and the screening member 30 are both inclined. The inclination angles of the bulk plate 29 and the screening member 30 are symmetrically distributed up and down. One end of the screening member 30 is fixedly connected to the sliding plate 32 and is lower than one end of its diagonal line, which is convenient for the automatic falling of the bamboo powder. The control end of the vibration motor 34 is electrically connected to the external power supply through an external switch, which is convenient for the operation of the device.

[0035] Working principle: First, the user dries the bamboo waste at a temperature of 60-80 degrees for 6-8 hours to remove residual moisture, and then pulverizes it in a pulverizing device for 1-3 hours to make the particle size 500-1500 mesh. The specific pulverizing process is as follows: the user puts the dried bamboo waste into the raw material tank 14 through the material tray 17. At this time, the output end of the second motor 23 drives a group of fourth gears 22 and a group of push rollers 19 to rotate, and a group of fourth gears 22 drives another group of fourth gears 22 to rotate. At this time, the two groups of fourth gears 22 can make the two groups of push rollers 19 rotate in the opposite direction at the same time, and the two groups of push rollers 19 drive the two groups of third gears 20 to rotate, and the two groups of third gears 20 drive the other three groups of third gears through two groups of toothed belts 21 respectively. 20 rotates, at this time, the upper and lower four groups of pushing rollers 19 rotate in opposite directions at the same time, so that the bamboo waste can be squeezed and moved forward by the pushing rollers 19, and at the same time, the output end of the electric push rod 25 drives the cutter 24 to move downward, and at the same time, the guide rod 27 compresses the first spring 28, and the bamboo waste moving forward can be sheared by the cutter 24, and cut into small pieces, and the cutter 24 is reset under the action of the first spring 28's own resilience. The sheared small pieces of bamboo waste fall into the crushing box 2 through the drop chute 15 and the first material channel 16. At this time, the crusher 13 rotating at a high speed can reduce its crushing, and at the same time, the bamboo powder is away from the center of the crushing box 2 under the action of the crusher 13. At this time, the output end of the first motor 9 The first gear 10 is driven to rotate, and the first gear 10 drives the second gear 11 and the collecting ring 8 to rotate, and the collecting ring 8 drives the collecting plate 12 to rotate, and the collecting plate 12 can move the bamboo powder on the surface of the collecting ring 8 to the center of the crushing box 2, so that the bamboo powder continues to be crushed, thereby improving the crushing effect and making the bamboo powder more thoroughly crushed. The user controls the electromagnetic valve 5 to work, and the crushed bamboo powder can fall to the top of the bulk plate 29 through the electromagnetic valve 5. After the vibration motor 34 is started, the bulk plate 29 and the sieve member 30 are vibrated through the fixed plate 33, and the bulk plate 29 and the sieve member 30 can make the slide bar 36 slide inside the guide sleeve 35 through the bulk plate 29 and the sieve member 30, and the second spring 37 can be continuously compressed and stretched by the slide bar 36, so that the bulk The material plate 29 can evenly discharge the material, and the bamboo powder is screened by the screening member 30. The screened bamboo powder falls into the interior of the sub-bin 31 and is finally discharged through the sliding plate 32. The larger particles of bamboo powder are screened again until they finally fall on the top of the transfer plate 38 and enter the interior of the transfer box 4 through the transfer plate 38. At the same time, the output end of the third motor 40 drives the spiral push rod 41 to rotate, and the larger particles of bamboo powder are moved to the interior of the second material channel 42 through the spiral push rod 41 and finally enter the interior of the crushing box 2 again for crushing, thereby improving the utilization rate of bamboo product waste. During the entire crushing process, the input end of the fan 46 generates negative pressure inside the water tank 43, and the air is discharged through the top of the exhaust pipe 47. Since the negative pressure is generated inside the water tank 43,Thus, the air inside the device flows to the inside of the water tank 43 through the air inlet pipe 45 and the connecting pipe 48, and the air can be dispersed through the air distribution box 44, so that the dust and fine particles in the air are precipitated in the liquid inside the water tank 43, thereby preventing the device from generating flying dust and flowing to the outside, thereby causing pollution and affecting the work of users. The device can improve the crushing effect of bamboo waste, and at the same time improve the utilization rate of bamboo waste, and can also avoid the impact of flying dust on the environment and users, and can also avoid the splashing of bamboo waste due to crushing during feeding, thereby further protecting users. At the same time, the device can work fully automatically, thereby reducing the difficulty of user operation and improving the convenience of user use. The PBAT particles are soaked in water, put into an oven, and the temperature is adjusted to 60-95°C for 8-72 hours. The particles are taken out and dried at 60 degrees for 12 hours to obtain high melt index PBAT particles with a melt index of 30-150 g / 10min, KH570 and ethanol are mixed evenly at a ratio of 1:1-10 for later use; 20 parts of high melt index PBAT particles and 20 parts of bamboo powder are mixed and added to a mixer for internal mixing, and the temperature is adjusted to 140-160 degrees. During this period, 30-60 parts of bamboo powder are added in batches, and 5-10 parts of KH570 ethanol mixed solution are evenly sprayed. After internal mixing for 1-3 hours, a block material is obtained, and the block material is added to a double cone strong feeding extruder for extrusion granulation. The temperature is set to 140-160 degrees to obtain a bamboo-based fully biodegradable masterbatch for later use; 10-50 parts of bamboo powder are treated in a plasma surface treatment machine for 0.1-2 hours, and the bamboo powder is stirred every 1 minute during the period to make the bamboo powder modified evenly; after the bamboo powder is modified, it is quickly mixed with 0-60 parts of PBST, 0-60 parts of PBAT, 0-30 parts of PPC, and PLA 0-30 parts, PPC-P0-30 parts, chain extender 0.1-1 parts, anti-hydrolysis agent 0.1-1 parts, antioxidant 0.1-1 parts, after uniform stirring for 0.5 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 obtain bamboo-based fully biodegradable particles after granulation; add the bamboo-based fully biodegradable particles into the film blowing machine for film blowing, adjust the blowing machine temperature 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, and obtain bamboo-based fully biodegradable mulch. Collect the waste bamboo products, crush them again, modify them, and add them to the degradable mulch. Not only can the waste resources be reused, but the performance of the degradable mulch is improved and the cost is reduced, which has great practical value.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a bamboo-based fully biodegradable mulch film, characterized in that: Including the preparation of bamboo-based fully biodegradable masterbatch and bamboo-based fully biodegradable mulch film; The preparation of the bamboo-based fully biodegradable masterbatch comprises: Step 1: Dry the bamboo waste at 60-80 degrees for 6-8 hours to remove residual moisture, and crush it in a crushing device for 1-3 hours to obtain a particle size of 500-1500 mesh for later use; Step 2: Soak the PBAT particles in water, put them in an oven, adjust the temperature to 60-95°C, and dry them for 8-72 hours. Take out the particles and dry them at 60 degrees for 12 hours to obtain high melt index PBAT particles with a melt index of 30-150 g / 10min. Mix KH570 and ethanol at a ratio of 1:1-10 for later use. Step 3: Mix 20 parts of high melt index PBAT particles and 20 parts of bamboo powder and add them to the internal mixer for internal mixing. Adjust the temperature to 140-160 degrees. During this period, add 30-60 parts of bamboo powder in batches, and evenly spray 5-10 parts of KH570 ethanol mixed solution. After internal mixing for 1-3 hours, a block material is obtained. The block material is added to a double cone strong feeding extruder for extrusion granulation. The temperature is set to 140-160 degrees to obtain a bamboo powder-based fully biodegradable masterbatch for standby use; The preparation of the bamboo powder-based fully biodegradable mulch film comprises: Step 1: Take 10-50 parts of bamboo powder and treat it in a plasma surface treatment machine for 0.1-2 hours, stirring the bamboo powder every 1 minute to make the bamboo powder modified evenly; Step 2: After bamboo powder is modified, it is quickly mixed with 0-60 parts of PBST, 0-60 parts of PBAT, 0-30 parts of PPC, 0-30 parts of PLA, 0-30 parts of PPC-P, 0.1-1 parts of chain extender, 0.1-1 parts of anti-hydrolysis agent, and 0.1-1 parts of antioxidant, and uniformly stirred for 0.5 hours, and then added into a twin-screw granulator for extrusion granulation; Step 3: Setting 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 obtaining bamboo-based fully biodegradable particles through pelletizing; Step 4: Add the bamboo-based 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 bamboo-based fully biodegradable mulch film.

2. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 1, characterized in that: The pulverizing device comprises a screening box (1), a feeding auxiliary mechanism, a screening mechanism, a waste material circulation mechanism and a negative pressure dust suction mechanism, wherein the bottom end of the screening box (1) is fixedly connected to a crushing box (2), one end of the screening box (1) is fixedly connected to an auxiliary box (3), the other end of the screening box (1) is fixedly connected to a transfer box (4), the bottom end of the crushing box (2) is connected to an electromagnetic valve (5), and the top end of the electromagnetic valve (5) is located inside the screening box (1), a positioning groove (6) is provided on the inner wall of the bottom end of the crushing box (2), a transmission groove (7) is provided in the middle of the crushing box (2), and a collecting ring (8) is slidably connected to the inside of the crushing box (2), and The bottom end of the aggregate ring (8) is slidably connected to the positioning groove (6); a first motor (9) is provided at one end of the transmission groove (7); a first gear (10) is fixedly connected to the output end of the first motor (9); a second gear (11) is fixedly connected to the middle of the aggregate ring (8), and the second gear (11) is meshed with the first gear (10); an aggregate plate (12) is evenly fixedly connected to the inside of the aggregate ring (8), and the angle between the aggregate plate (12) and the inner wall of the aggregate ring (8) is ten degrees; a crusher (13) is provided in the middle of the crushing box (2), and both ends of the crusher (13) are connected to the inner wall of the crushing box (2) through bearings.

3. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 2, characterized in that: The control ends of the solenoid valve (5), the first motor (9) and the crusher (13) are all electrically connected to an external power source via an external switch.

4. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 2, characterized in that: The feeding auxiliary mechanism comprises a raw material trough (14), a blanking trough (15), a first material channel (16), a material tray (17), a power bin (18), a material push roller (19), a third gear (20), a toothed belt (21), a fourth gear (22), a second motor (23), a cutter (24), an electric push rod (25), a guide groove (26), a guide rod (27) and a first spring (28). A raw material trough (14) is provided at the middle and upper part of the auxiliary box (3), a blanking trough (15) is provided at one end of the raw material trough (14), and a material tray (17) is fixedly connected to the other end of the raw material trough (14). One end of the trough (15) is connected to a first material channel (16), and one end of the first material channel (16) is connected to the top of the crushing box (2), and the end of the first material channel (16) connected to the crushing box (2) is lower than the other end. A power bin (18) is provided on one side of the raw material trough (14), and the inner walls of the upper and lower ends of the raw material trough (14) are evenly connected to four sets of push rollers (19) through bearings, and one end of the push rollers (19) is connected to the inner wall of the power bin (18) through bearings, and one end of the push rollers (19) is fixedly connected to a third gear (20), and the interior of the power bin (18) is Two groups of toothed belts (21) are provided, and the inner walls of the toothed belts (21) are respectively meshed with the third gear (20); one end of the two groups of push rollers (19) are fixedly connected to the fourth gear (22), and the fourth gears (22) are meshed with each other; a second motor (23) is provided inside the power bin (18), and the output end of the second motor (23) is fixedly connected to one end of a group of push rollers (19); a cutter (24) is slidably connected to the top of the blanking trough (15), and one side of the cutter (24) is in contact with one end of the raw material trough (14); and the inner wall of the top of the blanking trough (15) is evenly provided with three An electric push rod (25) is provided, and the output end of the electric push rod (25) is fixedly connected to the top end of the cutter (24); guide grooves (26) are provided on both sides of the inner wall of the bottom end of the blanking trough (15); guide rods (27) are slidably connected to the inside of the guide grooves (26), and the top ends of the guide rods (27) are fixedly connected to the cutter (24); the bottom ends of the guide rods (27) are fixedly connected to the first springs (28), and the bottom ends of the first springs (28) are respectively fixedly connected to the inner walls of the guide grooves (26); and the control ends of the second motor (23) and the electric push rod (25) are electrically connected to an external power supply through an external switch.

5. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 2, characterized in that: The screening mechanism comprises a bulk material plate (29), a screening element (30), a material distribution bin (31), a sliding plate (32), a fixed plate (33), a vibration motor (34), a guide sleeve (35), a sliding rod (36), a second spring (37) and a transfer plate (38). The top of the screening box (1) is provided with a bulk material plate (29), the bottom of the bulk material plate (29) is evenly provided with three groups of screening elements (30), the inside of the screening element (30) is provided with a material distribution bin (31), one end of the material distribution bin (31) is fixedly connected with the sliding plate (32), the inside of the screening box (1) is provided with a fixed plate (33), and the inner wall of the fixed plate (33) is respectively connected to the bulk material plate (29). ) and the two ends of the screening member (30), a vibration motor (34) is arranged at the bottom end of the fixed plate (33), the inner walls of the two ends of the screening box (1) are evenly fixedly connected with guide sleeves (35), the interior of the guide sleeves (35) are slidably connected with slide rods (36), and one end of the slide rods (36) are respectively fixedly connected to the two ends of the bulk material plate (29) and the screening member (30), one end of the slide rods (36) are fixedly connected to the second spring (37), and one end of the second spring (37) is fixedly connected to the inner wall of the guide sleeve (35), one end of the screening box (1) is fixedly connected with a transfer plate (38), and one end of the transfer plate (38) is located in the middle of the transfer box (4).

6. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 5, characterized in that: The transfer plate (38) is located at the bottom end of the lowest group of screening members (30); the bulk material plate (29) and the screening member (30) are both inclined; the inclination angles of the bulk material plate (29) and the screening member (30) are symmetrically distributed up and down; one end of the screening member (30) is fixedly connected to the sliding plate (32) and is lower than the end of its diagonal; and the control end of the vibration motor (34) is electrically connected to an external power supply via an external switch.

7. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 2, characterized in that: The waste circulation mechanism comprises a barrel (39), a third motor (40), a spiral push rod (41) and a second material channel (42); the barrel (39) is arranged in the middle of the transfer box (4), and the barrel (39) is inclined; the third motor (40) is arranged at the top of the barrel (39); the inside of the barrel (39) is connected to the spiral push rod (41) via a bearing, and one end of the spiral push rod (41) is fixedly connected to the output end of the third motor (40); the top of the barrel (39) is connected to the second material channel (42), and one end of the second material channel (42) is connected to the top of the crushing box (2); and the control end of the third motor (40) is electrically connected to an external power supply via an external switch.

8. The method for preparing the bamboo-based fully biodegradable mulch film according to claim 2, characterized in that: The negative pressure dust suction mechanism comprises a water tank (43), an air distribution box (44), an air intake pipe (45), a fan (46), an exhaust pipe (47) and a connecting pipe (48). The bottom end of the auxiliary box (3) is provided with a water tank (43), the interior of the water tank (43) is provided with an air distribution box (44), the top end of the air distribution box (44) is connected with an air intake pipe (45), and one end of the air intake pipe (45) passes through the auxiliary box (3) and is connected to the top end of the crushing box (2). One end of the screening box (1) is connected with a connecting pipe (48), and one end of the connecting pipe (48) is connected to the air intake pipe (45). The middle part of the auxiliary box (3) is provided with a fan (46), both ends of the fan (46) are connected to the exhaust pipe (47), the bottom end of a group of the exhaust pipes (47) is connected to the water tank (43), and the control end of the fan (46) is electrically connected to an external power supply through an external switch.

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