Preparation method of black master batch required by black agricultural mulching film

Abstract

The invention provides a preparation method of a black master batch required by a black agricultural mulching film, and relates to the technical field of high polymer materials, and the preparation method comprises the following steps: dissolving target weight of 2, 6-di-tert-butyl-4-hydroxymethylphenol and target weight of dibutyltin dilaurate in a certain weight of N, N-dimethylformamide, and stirring to obtain a mixture; adding a target weight of an isophorone diisocyanate N, N-dimethylformamide solution, and carrying out a reaction in a nitrogen atmosphere; dispersing carbon black with a target weight into N, N-dimethylformamide with a certain weight to obtain a dispersion liquid, adding the dispersion liquid into a reaction system in the step 1, adding into a filtering and washing dryer after the reaction is finished, filtering and collecting to obtain a filter cake, washing and drying the filter cake to obtain hindered phenol modified carbon black, and drying the hindered phenol modified carbon black to obtain the hindered phenol modified carbon black. When the hindered phenol modified carbon black is produced, filtering, washing and drying are integrated in one device by arranging the filtering, washing and drying device, so that the step of transferring materials is reduced, the labor intensity is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and specifically relates to a preparation method of a masterbatch for black agricultural films. Background Art

[0002] Agricultural films are one of the important agricultural supplies for high-standard farmland. Whole-course weed-control black agricultural films can be used for food crops, cash crops, vegetable crops, flowers, fruit trees, etc. They can not only prevent the photosynthesis of weeds, making the weeds unable to grow, but also eradicate the soil pollution caused by the use of herbicides, purify the soil and water sources, prevent crop pollution from the source, and the products can meet the pollution-free standards, thus improving the market share of the products.

[0003] As a black colorant, carbon black has strong coloring power and excellent covering properties, and is widely used in the agricultural film industry. In addition to dyeing, adding carbon black to agricultural films also has various excellent properties such as filling, strengthening, antistatic and anti-aging. However, during the production process of agricultural films, especially in the batching and mixing stages, the addition of carbon black causes environmental pollution problems such as particle flying and dust everywhere. To solve this problem, the agricultural film industry has gradually avoided directly using carbon black and switched to using masterbatch for production. However, the production of masterbatch requires filtration, washing, and drying process steps, which need to be completed by a filter, a washing machine, and a dryer respectively. The transfer of materials between equipment is likely to cause material loss and waste, increase labor intensity, and reduce production efficiency. Summary of the Invention

[0004] The present invention provides a preparation method of a masterbatch for black agricultural films, which is used to solve the technical problems that the production of masterbatch requires filtration, washing, and drying process steps, which need to be completed by a filter, a washing machine, and a dryer respectively. The transfer of materials between equipment is likely to cause material loss and waste, increase labor intensity, and reduce production efficiency.

[0005] To solve the above technical problems, the present invention discloses a preparation method of a masterbatch for black agricultural films, including the following steps: Step 1: Dissolve the target weight of 2,6-di-tert-butyl-4-hydroxymethylphenol and dibutyltin dilaurate in a certain weight of N,N-dimethylformamide, and then add the N,N-dimethylformamide solution of the target weight of isophorone diisocyanate, and react under a nitrogen atmosphere.

[0006] Step 2: Disperse the target weight of carbon black in a certain weight of N,N-dimethylformamide to obtain a dispersion liquid, add the dispersion liquid to the reaction system in Step 1, and after the reaction is completed, add it to a filter-washing-drying machine. First, filter and collect the filter cake, and then wash and dry the filter cake to obtain hindered phenol-modified carbon black.

[0007] Step 3: Mix phosphoric acid of the target weight with urea, add carbon black of a certain weight after heating for reaction, cure in an oven after the reaction ends, and crush the cured substance to obtain ammonium polyphosphate modified carbon black;

[0008] Step 4: Add polyethylene resin of the target weight, hindered phenol modified carbon black, ammonium polyphosphate modified carbon black, dispersant, and solubilizer into a heating kneader for kneading;

[0009] Step 5: Feed the kneaded material into a twin-screw extruder for extrusion, and then successively pass through cooling, drying, and pelletizing to obtain a masterbatch.

[0010] Preferably, the target weight ratio of polyethylene resin, hindered phenol modified carbon black, ammonium polyphosphate modified carbon black, dispersant, and solubilizer is 100-150:25-50:25-50:0.1-5:0.1-10. The dispersant includes any one or a mixture of polyethylene wax, ethylene bisstearamide, and calcium stearate, and the solubilizer is maleic anhydride grafted polyethylene.

[0011] Preferably, in Step 2, the weight ratio of 2,6-di-tert-butyl-4-hydroxymethylphenol, dibutyltin dilaurate, N,N-dimethylformamide, and isophorone diisocyanate N,N-dimethylformamide solution is 45:0.05:168.8:37.5, and the weight ratio of carbon black and N,N-dimethylformamide is 20:944.

[0012] Preferably, in Step 3, the weight ratio of phosphoric acid, urea, and carbon black is 1:1:0.4.

[0013] Preferably, the filter washing dryer includes a working shell. Legs are provided at the lower vertex of the working shell. A cavity is provided inside the working shell. The cavity is distributed from top to bottom as a movable cavity, a working cavity, a drainage cavity, and a pressure cavity. A working plate is slidably provided between the movable cavity and the working cavity. A filter plate is rotatably provided between the working cavity and the drainage cavity. A partition is provided between the drainage cavity and the pressure cavity. A rotating cylinder is rotatably provided at the upper end of the cavity. A filter screen is provided at the side end of the rotating cylinder. The working plate is movably connected to the rotating cylinder, and the filter plate is rotatably connected to the rotating cylinder. An air inlet is communicated with the left lower side of the drainage cavity, and a drainage port is communicated with the right lower side of the drainage cavity. A feeding port and an exhaust port are communicated with the left upper side of the drainage cavity. A driving mechanism is provided at the upper end of the working shell, and the driving mechanism is connected to the rotating cylinder.

[0014] Preferably, the air inlet is communicated with an air inlet pump. The air inlet pump is fixedly arranged at the lower left side of the working shell. A heater is fixedly arranged in the air inlet. The drainage port is communicated with a drainage pump. The drainage pump is fixedly arranged at the lower right side of the working shell.

[0015] Preferably, a plurality of first spring rods are fixedly arranged between the partition and the lower end of the cavity.

[0016] Preferably, the driving mechanism includes a fixing plate fixedly arranged at the upper end of the working shell. The fixing plate is fixedly connected to the motor, the motor is fixedly connected to the driving shaft, the driving shaft penetrates through the upper end of the working shell and enters the flow cavity in the rotating cylinder and is fixedly connected to the intake fan. The upper end of the working shell is provided with a ventilation port penetrating through, and the ventilation port is communicated with the flow cavity. The driving shaft is fixedly connected to an external gear one, the gear one meshes with the gear two, the gear two is fixedly connected to the threaded sleeve, the threaded sleeve passes through the annular groove at the upper end of the working shell and enters the movable cavity and is in threaded connection with the threaded rod, the threaded rod is connected to the working plate, the working plate is fixedly connected to the connecting rod, the connecting rod penetrates through the filter plate and is matched with the matching groove on the upper side of the matching block, the matching groove on the lower side of the matching block is matched with the vertical section of the L-shaped connecting rod, the vertical section of the L-shaped connecting rod penetrates through the lower end of the working shell and is communicated with the outside, and a third spring rod is fixedly arranged between the horizontal end of the L-shaped connecting rod and the lower end of the working shell. The horizontal section of the L-shaped connecting rod is rotatably connected to the rotating ball, and the rotating ball is slidably connected to the spiral groove on the rotating shaft. The rotating shaft penetrates through the lower end of the working shell and the partition plate and is fixedly connected to the rotating cylinder.

[0017] Preferably, the upper side of the connecting rod is fixedly connected to the first stirring rod, the lower side of the rotating cylinder is provided with the second stirring rod, the left and right sides of the horizontal section of the L-shaped connecting rod are symmetrically provided with the first connecting blocks, the first connecting blocks penetrate through the lower end of the working shell and are fixedly connected to the rotating blocks, the rotating blocks are movably connected to the rotating shaft, the rotating blocks are rotatably connected to the pulling blocks, the pulling blocks are fixedly connected to the blocking plates, and the blocking plates are matched with the liquid discharge port at the lower end of the rotating cylinder.

[0018] Preferably, it further includes a switching mechanism. The switching mechanism includes a rotating sleeve. The lower end of the rotating sleeve is provided with a guiding ring groove, and the guiding ring groove is slidably connected to the rough block. The rough block is fixedly connected to the fixing plate through the mounting block. The upper and lower ends of the rotating sleeve are provided with through holes, and a driving shaft is arranged in the through holes. The driving shaft is fixedly connected to the rotating block, and the rotating block is correspondingly in contact with the inclined end of the guiding block. The through holes are communicated with the sliding grooves, and the sliding grooves are arranged on the rotating sleeve. A plurality of springs are fixedly arranged between the guiding block and the sliding grooves. The guiding block is fixedly connected to the pushing rod, the pushing rod penetrates through the end of the sliding groove far away from the through hole and is in contact with an external control block, the control block is fixedly connected to the second connecting block, a plurality of second spring rods are fixedly arranged between the second connecting block and the right end of the working shell, the second connecting block is fixedly connected to the third connecting block and the clamping block, the third connecting block penetrates through the right end of the working shell and enters the liquid discharge cavity and is slidably connected to the matching block, and the clamping block is correspondingly matched with the clamping hole on the limiting block. The limiting block is rotatably connected to the gear two.

[0019] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail.

[0020] The present invention has the following beneficial effects:

[0021] When producing hindered phenol modified carbon black, by setting up a filter-washing dryer, the processes of filtration, washing, and drying are integrated in one device, namely the filter-washing dryer, which reduces the steps of transferring materials, lowers the labor intensity, and improves the production efficiency. Description of the Drawings

[0022] The drawings are used to provide a further understanding of the present invention and form a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0023] Figure 1 is the process flow chart of the present invention;

[0024] Figure 2 is the schematic structural diagram of the filter-washing dryer of the present invention;

[0025] Figure 3 is Figure 2 the enlarged structural diagram of area A in

[0026] Figure 4 is Figure 2 the enlarged structural diagram of area B in

[0027] Figure 5 is the schematic structural diagram of the rotating sleeve connection of the present invention.

[0028] In the figures: 1, working shell; 2, working plate; 3, filter plate; 4, movable cavity; 5, working cavity; 6, drainage cavity; 7, partition board; 8, pressure cavity; 9, annular groove; 10, ventilation port; 11, feeding port; 12, exhaust port; 13, filter net; 14, sliding groove; 15, rotating cylinder; 16, flow cavity; 17, intake fan; 18, drive shaft; 19, fixing plate; 20, motor; 21, gear one; 22, gear two; 23, limiting block; 24, clamping hole; 25, control block; 26, clamping block; 27, connecting block two; 28, threaded sleeve; 29, threaded rod; 30, spring rod two; 31, connecting rod; 32, stirring rod one; 33, drainage pump; 34, stirring rod two; 35, fitting block; 36, fitting groove; 37, connecting block three; 38, L-shaped connecting rod; 39, rotating ball; 40, rotating shaft; 41, spiral groove; 42, spring rod one; 43, intake pump; 44, intake port; 45, support leg; 46, blocking plate; 47, pulling block; 48, connecting block one; 49, rotating block; 50, rotating sleeve; 51, mounting block; 52, rough block; 53, through hole; 54, guiding block; 55, guiding ring groove; 56, spring; 57, pushing rod; 58, rotating block. Detailed Embodiments

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0030] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence. Nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions and technical features between various embodiments may be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides the following embodiments

[0032] Embodiment 1

[0033] The embodiment of the present invention provides a preparation method of a black masterbatch required for a black agricultural film, as Figure 1 shown, including the following steps:

[0034] Step 1: Dissolve the target weight of 2,6-di-tert-butyl-4-hydroxymethylphenol and dibutyltin dilaurate in a certain weight of N,N-dimethylformamide, and then add the target weight of isophorone diisocyanate N,N-dimethylformamide solution, and react under a nitrogen atmosphere;

[0035] Step 2: Disperse the target weight of carbon black in a certain weight of N,N-dimethylformamide to obtain a dispersion, add the dispersion to the reaction system of Step 1, and after the reaction is completed, add it to a filter washing dryer. First, filter and collect the filter cake, and then wash and dry the filter cake to obtain hindered phenol-modified carbon black;

[0036] Step 3: Mix the target weight of phosphoric acid and urea, heat and then add a certain weight of carbon black to react. After the reaction is completed, cure it in an oven, and crush the cured substance to obtain ammonium polyphosphate-modified carbon black;

[0037] Step 4: Add the target weight of polyethylene resin, hindered phenol-modified carbon black, ammonium polyphosphate-modified carbon black, dispersant, and solubilizer to a heating kneader and knead;

[0038] Step 5: Feed the kneaded material into a twin-screw extruder for extrusion, and then successively pass through cooling, drying, and pelletizing to obtain a black masterbatch;

[0039] The target weight ratios of polyethylene resin, hindered phenol modified carbon black, ammonium polyphosphate modified carbon black, dispersant, and solubilizer are 100 - 150:25 - 50:25 - 50:0.1 - 5:0.1 - 10. The dispersant includes any one or a mixture of polyethylene wax, ethylene bisstearamide, and calcium stearate, and the solubilizer is maleic anhydride grafted polyethylene;

[0040] In step 2, the weight ratios of 2,6 - di - tert - butyl - 4 - hydroxymethylphenol, dibutyltin dilaurate, N,N - dimethylformamide, and isophorone diisocyanate N,N - dimethylformamide solution are 45:0.05:168.8:37.5, and the weight ratio of carbon black to N,N - dimethylformamide is 20:944;

[0041] In step 3, the weight ratios of phosphoric acid, urea, and carbon black are 1:1:0.4.

[0042] The beneficial effects of the above - mentioned technical solution are:

[0043] In step 1, under a nitrogen atmosphere, the reaction is carried out at 30°C for 6 h. In step 2, ultrasonic dispersion is carried out at 400 W and 35 kHz for 20 min to obtain a dispersion liquid, and the dispersion liquid is added to the reaction system in step 1, and the reaction is carried out at 80°C for 2 h. The filter cake is washed 3 times with 98 wt% ethanol aqueous solution, and vacuum - dried at 50°C for 12 h to obtain hindered phenol modified carbon black. In step 3, phosphoric acid is heated to 70°C and then urea is added, and then heated to 130°C at a heating rate of 3°C / min, carbon black is added, and the reaction is carried out for 30 min. After the reaction, the product is transferred to an oven and cured at 210°C for 3 h. The cured material is crushed and passed through a 200 - mesh sieve to obtain ammonium polyphosphate modified carbon black. Mixing is carried out in a heating kneader at a temperature of 120°C and a rotation speed of 40 r / min for 50 min. The extrusion temperatures of the twin - screw extruder are: 150°C, 160°C, 170°C, 180°C, 190°C, the head temperature is 180°C, and the main machine rotation speed is 300 r / min;

[0044] When the hindered phenol modified carbon black and the ammonium polyphosphate modified carbon black are used in combination, through the synergistic effects of free - radical capture, catalytic carbonization, physical barrier, and hindered phenol and free - radical quenching, the material has better flame - retardant properties. When producing the hindered phenol modified carbon black, by setting up a filter - washing - drying device, filtering, washing, and drying are integrated in one device for operation, reducing the steps of transferring materials, solving the technical problems of the process steps of filtering, washing, and drying required for producing masterbatch. The above - mentioned process needs to be completed separately by a filter, a washing machine, and a dryer. The transfer of materials between devices easily causes material loss and waste, and increases the labor intensity and reduces the production efficiency.

[0045] Example 2

[0046] On the basis of Embodiment 1, as Figures 2 - 5 shown, the filtration washing dryer includes a working shell 1. Legs 45 are provided at the lower vertex angles of the working shell 1. A cavity is provided inside the working shell 1. The cavity is distributed from top to bottom as a movable cavity 4, a working cavity 5, a drainage cavity 6, and a pressure cavity 8. A working plate 2 is slidably provided between the movable cavity 4 and the working cavity 5. A filter plate 3 is rotatably provided between the working cavity 5 and the drainage cavity 6. A partition plate 7 is provided between the drainage cavity 6 and the pressure cavity 8. A rotating cylinder 15 is rotatably provided at the upper end of the cavity. A filter net 13 is provided at the side end of the rotating cylinder 15. The working plate 2 is movably connected to the rotating cylinder 15. The filter plate 3 is rotatably connected to the rotating cylinder 15. An air inlet 44 is communicated with the left end of the lower side of the drainage cavity 6. A liquid outlet is communicated with the right end of the lower side of the drainage cavity 6. A feeding port 11 and an exhaust port 12 are communicated with the left end of the upper side of the drainage cavity 6. A driving mechanism is provided at the upper end of the working shell 1. The driving mechanism is connected to the rotating cylinder 15;

[0047] The air inlet 44 is communicated with an air inlet pump 43. The air inlet pump 43 is fixedly arranged at the lower left side of the working shell 1. A heater is fixedly provided in the air inlet 44. The liquid outlet is communicated with a liquid outlet pump 33. The liquid outlet pump 33 is fixedly arranged at the lower right side of the working shell 1;

[0048] A number of first spring rods 42 are fixedly provided between the partition plate 7 and the lower end of the cavity.

[0049] The beneficial effects of the above technical solution are:

[0050] After adding the reaction solution that has ended in Step 2 into the working chamber 5 through the feeding port 11, the liquid in the reaction solution passes through the filter plate 3 and the filter screen 13, and then enters the liquid discharge chamber 6. The liquid discharge pump 33 operates to discharge the filtered liquid. The remaining materials are distributed on the filter plate 3 and the filter screen 13 to obtain a filter cake. Then, a washing liquid is added into the working chamber 5 through the feeding port 11. The washing liquid washes away the impurities in the materials and takes them away from the materials. The washing liquid containing impurities passes through the filter plate 3 and the filter screen 13 and enters the liquid discharge chamber 6. The setting of the filter plate 3 and the filter screen 13 increases the filtering area, avoiding the situation that the filtering area is too small and prone to blockage, thus unable to carry out the filtering work. The liquid discharge pump 33 operates to discharge the washing liquid. Finally, the air inlet pump 43 and the heater are controlled to work, so that the gas entering the liquid discharge chamber 6 blows up the filter cake through the filter plate 3, making it suspended in the working chamber 5 in a powder form, which is beneficial to accelerating the drying speed of the materials. A number of first spring rods 42 are fixedly arranged at the lower end of the partition plate 7 and the cavity. After the liquid enters the liquid discharge chamber 6, under the action of the gravity of the liquid, the partition plate 7 can be driven to move downward, and the first spring rods 42 are compressed. At this time, the sum of the elastic forces of the number of first spring rods 42 is the total weight of the filtered liquid. According to the compression value of the first spring rods 42, it is convenient to monitor the amount of the filtered liquid, and then the liquid is discharged. Under the elastic action of the first spring rods 42, the partition plate 7 gradually returns to its original position. Similarly, when the air inlet pump 43 operates and the gas entering the liquid discharge chamber 6 increases, when the air pressure in the liquid discharge chamber 6 becomes larger, the partition plate 7 will also move downward. At this time, the sum of the elastic forces of the number of first spring rods 42 is the change value of the air pressure in the liquid discharge chamber 6. According to the compression value of the first spring rods 42, it is convenient to control the air pressure in the liquid discharge chamber 6 and the gas pressure entering the working chamber 5 through the filter plate 3 to reach the target air pressure value, ensuring that the filter cake is blown up.

[0051] Example 3

[0052] On the basis of Example 2, as Figures 2 - 5As shown in the figure, the driving mechanism includes a fixing plate 19 which is fixedly arranged at the upper end of the working shell 1. The fixing plate 19 is fixedly connected to the motor 20. The motor 20 is fixedly connected to the driving shaft 18. The driving shaft 18 penetrates through the upper end of the working shell 1 and enters the flow cavity 16 in the rotating cylinder 15 and is fixedly connected to the intake fan 17. The upper end of the working shell 1 is provided with a ventilation port 10 which penetrates through. The ventilation port 10 is communicated with the flow cavity 16. The driving shaft 18 is fixedly connected to the external gear one 21. The gear one 21 meshes with the gear two 22. The gear two 22 is fixedly connected to the threaded sleeve 28. The threaded sleeve 28 passes through the annular groove 9 at the upper end of the working shell 1 and enters the moving cavity 4 and is threadedly connected to the threaded rod 29. The threaded rod 29 is rotatably connected to the working plate 2. The working plate 2 is fixedly connected to the connecting rod 31. The connecting rod 31 penetrates through the filter plate 3 and cooperates with the cooperation groove 36 on the upper side of the cooperation block 35. The cooperation groove 36 on the lower side of the cooperation block 35 cooperates with the vertical section of the L-shaped connecting rod 38. The vertical section of the L-shaped connecting rod 38 penetrates through the lower end of the working shell 1 and is communicated with the outside. A third spring rod is fixedly arranged between the horizontal end of the L-shaped connecting rod 38 and the lower end of the working shell 1. The horizontal section of the L-shaped connecting rod 38 is rotatably connected to the rotating ball 39. The rotating ball 39 is slidably connected to the spiral groove 41 on the rotating shaft 40. The rotating shaft 40 penetrates through the lower end of the working shell 1 and the partition plate 7 and is fixedly connected to the rotating cylinder 15;

[0053] The upper side of the connecting rod 31 is fixedly connected to the first stirring rod 32. The lower side of the rotating cylinder 15 is provided with the second stirring rod 34. Symmetrically arranged on the left and right sides of the horizontal section of the L-shaped connecting rod 38 are the first connecting blocks 48. The first connecting blocks 48 penetrate through the lower end of the working shell 1 and are fixedly connected to the rotating blocks 49. The rotating blocks 49 are movably connected to the rotating shaft 40. The rotating blocks 49 are rotatably connected to the pulling blocks 47. The pulling blocks 47 are fixedly connected to the blocking plates 46. The blocking plates 46 cooperate with the liquid discharge port at the lower end of the rotating cylinder 15.

[0054] The beneficial effects of the above technical solution are:

[0055] The filter plate 3 is rotatably connected to the rotating cylinder 15, so that the rotating cylinder 15 supports the upper end of the working shell 1. When filtering, the driving mechanism works. The motor 20 drives the driving shaft 18 to work, the driving shaft 18 drives the first gear 21 and the intake fan 17 to work. The first gear 21 drives the second gear 22 to rotate, the second gear 22 drives the threaded sleeve 28 to rotate, the threaded sleeve 28 drives the threaded rod 29 to move downward, the threaded rod 29 drives the working plate 2 to move downward, the working plate 2 drives the connecting rod 31 to move downward, the connecting rod 31 pushes the matching block 35 to move downward, the matching block 35 drives the L-shaped connecting rod 38 to move downward, the third spring rod stretches, the L-shaped connecting rod 38 drives the rotating ball 39 to move downward, the rotating ball 39 slides along the spiral groove 41, drives the rotating shaft 40 to rotate, the rotating shaft 40 drives the rotating cylinder 15 to rotate. As the L-shaped connecting rod 38 moves downward, it drives the first connecting block 48 to move downward. The first connecting block 48 drives the blocking plate 46 to disengage from the liquid discharge port at the lower end of the rotating cylinder 15 through the rotating block 49 and the pulling block 47, so that the liquid entering the flow chamber 16 flows into the liquid discharge chamber 6 through the liquid discharge port. And during the downward movement of the working plate 2, pressure can be applied to the reaction liquid in the working chamber 5, accelerating the liquid in the reaction liquid to pass through the filter plate 3 and the filter net 13. And the working plate 2 slides along the rotating cylinder 15, scraping the materials attached to the filter net 13 onto the filter plate 3. And the rotation of the rotating cylinder 15 also makes the filter net 13 in a rotating state, further reducing the materials attached to the filter net 13 under the centrifugal force;

[0056] Control the motor 20 to drive the driving shaft 18 to rotate in the reverse direction, so that the working plate 2 returns to its original position. Under the elastic action of the third spring rod, the blocking plate 46 is re-mated with the liquid discharge port. At this time, since the threaded rod 29 cannot move upward continuously, the threaded rod 29 and the threaded sleeve 28 form a whole, so that the threaded sleeve 28 and the second gear 22 connected thereto cannot rotate. At this time, the first gear 21 drives the second gear 22 to rotate around the first gear 21 as the center. The second gear 22 drives the threaded sleeve 28 to slide along the annular groove 9. The center of the annular groove 9 coincides with the center of the first gear 21. The threaded sleeve 28 drives the working plate 2 to rotate through the threaded rod 29. The working plate 2 drives the filter plate 3 to rotate through the connecting rod 31. The connecting rod 31 drives the first stirring rod 32 to rotate, stirring and mixing the washing liquid and the materials remaining on the filter plate 3 and the filter net 13, improving the washing effect. After stirring for a period of time, control the motor 20 to work forward again. Similar to the above filtering work, the washing liquid is discharged into the liquid discharge chamber 6. During this process, the second stirring rod 34 will rotate with the rotating cylinder 15, further improving the washing effect of the washing liquid on the materials and reducing the waste of the washing liquid. The first stirring rod 32 is located above the connecting rod 31, so that after the threaded rod 29 cannot move downward, the connecting rod 31 does not contact the lower second stirring rod 34, ensuring the normal downward movement of the working plate 2;

[0057] When the intake fan 17 rotates in the reverse direction along with the drive shaft 18, it can send the outside air into the flow chamber 16 through the ventilation port 10, and then blow it into the working chamber 5 through the filter net 13, blowing the materials attached to the filter net 13 away from the filter net 13, which is used to cooperate with the intake pump 43 for drying work. When the air pressure in the working chamber 5 is too high, the exhaust port 12 is used to relieve the pressure of the gas. A pressure relief valve and a filter layer can be arranged in the exhaust port 12 to prevent the materials from being discharged from the working chamber 5. When performing filtration, washing and drying work, a stop block is installed at the feeding port 11 to ensure that the working chamber 5 is a closed space, integrating filtration, washing and drying into one work, and avoiding the tediousness of transferring materials.

[0058] Embodiment 4

[0059] On the basis of Embodiment 3, as Figures 2 - 5 shown, it further includes a switching mechanism. The switching mechanism includes a rotating sleeve 50. A guiding ring groove 55 is provided at the lower end of the rotating sleeve 50. The guiding ring groove 55 is slidably connected with a rough block 52. The rough block 52 is fixedly connected with a fixing plate 19 through a mounting block 51. Through holes 53 are provided through the upper and lower ends of the rotating sleeve 50. A drive shaft 18 is arranged in the through holes 53. The drive shaft 18 is fixedly connected with a rotating block 58. The rotating block 58 is in corresponding contact with the inclined end of a guiding block 54. The through holes 53 are communicated with a sliding groove 14. The sliding groove 14 is arranged on the rotating sleeve 50. A number of springs 56 are fixedly arranged between the guiding block 54 and the sliding groove 14. The guiding block 54 is fixedly connected with a push rod 57. The push rod 57 penetrates through one end of the sliding groove 14 far away from the through hole 53 and contacts an external control block 25. The control block 25 is fixedly connected with a second connecting block 27. A number of second spring rods 30 are fixedly arranged between the second connecting block 27 and the right end of the working shell 1. The second connecting block 27 is fixedly connected with a third connecting block 37 and a clamping block 26. The third connecting block 37 penetrates through the right end of the working shell 1 and enters the liquid discharge chamber 6 and is slidably connected with a matching block 35. The clamping block 26 is in corresponding cooperation with a clamping hole 24 on a limiting block 23. The limiting block 23 is rotatably connected with a second gear 22.

[0060] The beneficial effects of the above technical solution are:

[0061] Set the friction between the annular groove 9 and the threaded sleeve 28 to be large enough so that when the threaded rod 29 can move, the threaded sleeve 28 and the connected second gear 22 can rotate freely, and the threaded sleeve 28 cannot slide along the annular groove 9. By setting the switching mechanism, when the motor 20 drives the drive shaft 18 to rotate in the reverse direction, that is, in the clockwise direction, the drive shaft 18 drives the rotating block 58 to rotate. The rotating block 58 contacts the inclined end of the guiding block 54, driving the guiding block 54 to move away from the through hole 53. The friction between the guiding ring groove 55 and the rough block 52 is large enough to keep the rotating sleeve 50 stationary. The guiding block 54 drives the push rod 57 to move, and the guiding block 54 drives a number of springs 56 to compress. When the push rod 57 moves, it drives the second connecting block 27 to move, stretching the second spring rod 30. When the second connecting block 27 moves, it drives the latch 26 to disengage from the engagement with the card hole 24, so that the limiting block 23 is no longer limited by the latch 26, and the threaded sleeve 28 sliding along the annular groove 9 is no longer limited by the limiting block 23. After the working plate 2 returns to its original position and cannot move upward, the threaded sleeve 28 can start to slide along the annular groove 9. When the second connecting block 27 moves, it also drives the third connecting block 37 to pull the mating block 35 to move, so that the mating grooves 36 on the upper and lower sides of the mating block 35 are disengaged from the connecting rod 31 and the L-shaped connecting rod 38, so that when the connecting rod 31 rotates, it will not drive the mating block 35 and the L-shaped connecting rod 38 to rotate, and the moving stroke of the push rod 57 is large enough. During the gap when the rotating block 58 disengages from the inclined end of the guiding block 54, the stroke of the second connecting block 27 returning to its original position cannot make the latch 26 engage with the card hole 24 and the mating grooves 36 engage with the connecting rod 31 and the L-shaped connecting rod 38, ensuring that when the motor 20 rotates in the reverse direction, the latch 26 is always disengaged from the card hole 24, and the mating grooves 36 are always disengaged from the connecting rod 31 and the L-shaped connecting rod 38. When the motor 20 drives the drive shaft 18 to rotate in the forward direction, that is, in the counterclockwise direction, the drive shaft 18 drives the rotating block 58 to contact the straight end of the guiding block 54, and the guiding block 54 drives the rotating sleeve 50 to rotate. The guiding ring groove 55 on the rotating sleeve 50 slides with the rough block 52. At this time, the push rod 57 returns to its original position under the elastic action of the spring 56, and the second connecting block 27 returns to its original position under the elastic action of the second spring rod 30, so that the latch 26 re-engages with the card hole 24, and the mating grooves 36 re-engage with the connecting rod 31 and the L-shaped connecting rod 38. Specifically, it is necessary to move the card hole 24 to the corresponding position of the latch 26 before switching the rotation direction of the motor 20. The setting of the switching mechanism can automatically ensure that the threaded sleeve 28 will not shake in the annular groove 9 when the motor 20 is working in the forward direction, improving the moving stability of the working plate 2 when the motor 20 is working in the forward direction.

[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A method for preparing black masterbatch required for black agricultural mulch film, characterized in that: The following steps are involved: Step 1: dissolving a target weight of 2,6-di-tert-butyl-4-hydroxymethylphenol and dibutyltin dilaurate in a certain weight of N,N-dimethylformamide, and then adding a target weight of isophorone diisocyanate N,N-dimethylformamide solution, and reacting under a nitrogen atmosphere; Step 2: dispersing a target weight of carbon black in a certain weight of N,N-dimethylformamide to obtain a dispersion, adding the dispersion to the reaction system of step 1, adding the dispersion to a filter, washing and drying device after the reaction is completed, first filtering and collecting to obtain a filter cake, and then washing and drying the filter cake to obtain hindered phenol modified carbon black; Step 3: mixing a target weight of phosphoric acid and urea, adding a certain weight of carbon black to react after heating, curing in an oven after the reaction, and crushing the cured material to obtain ammonium polyphosphate modified carbon black; Step 4: adding a target weight of polyethylene resin, hindered phenol-modified carbon black, ammonium polyphosphate-modified carbon black, a dispersant, and a solubilizer into a heated kneading machine for kneading; Step 5: The kneaded material is fed into a twin-screw extruder for extrusion, and then cooled, dried, and pelletized to obtain black masterbatch.

2. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 1, characterized in that: The target weight ratio of polyethylene resin, hindered phenol modified carbon black, ammonium polyphosphate modified carbon black, dispersant and solubilizer is 100-150:25-50:25-50:0.1-5:0.1-10, the dispersant includes any one or more of polyethylene wax, vinyl bisstearamide and calcium stearate, and the solubilizer is maleic anhydride grafted polyethylene.

3. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 1, characterized in that: In step 2, the weight ratio of 2,6-di-tert-butyl-4-hydroxymethylphenol, dibutyltin dilaurate, N,N-dimethylformamide and isophorone diisocyanate N,N-dimethylformamide solution is 45: 0.05:168.8:37.5, the weight ratio of carbon black and N,N-dimethylformamide is 20:

944.

4. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 1, characterized in that: In step 3, the weight ratio of phosphoric acid, urea and carbon black is 1:1:0.

4.

5. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 1, characterized in that: The filter washing and drying device comprises a working shell (1), a support leg (45) is provided at the top corner of the lower end of the working shell (1), a cavity is provided inside the working shell (1), and the cavity is distributed from top to bottom into an active cavity (4), a working cavity (5), a drainage cavity (6) and a pressure cavity (8), a working plate (2) is slidably provided between the active cavity (4) and the working cavity (5), a filter plate (3) is rotatably provided between the working cavity (5) and the drainage cavity (6), a partition plate (7) is provided between the drainage cavity (6) and the pressure cavity (8), and the upper end of the cavity is rotatably provided. A rotating cylinder (15) is movably provided, a filter screen (13) is provided at the side end of the rotating cylinder (15), a working plate (2) is movably connected to the rotating cylinder (15), a filter plate (3) is rotatably connected to the rotating cylinder (15), a lower left end of the liquid discharge chamber (6) is connected to an air inlet (44), a lower right end of the liquid discharge chamber (6) is connected to a liquid discharge port, an upper left end of the liquid discharge chamber (6) is connected to a feed port (11) and an exhaust port (12), and a driving mechanism is provided at the upper end of the working shell (1), and the driving mechanism is connected to the rotating cylinder (15).

6. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 5, characterized in that: The air inlet (44) is communicated with the air inlet pump (43), which is fixedly arranged on the lower left side of the working shell (1). A heater is fixedly arranged in the air inlet (44), and the liquid discharge port is communicated with the liquid discharge pump (33), which is fixedly arranged on the lower right side of the working shell (1).

7. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 5, characterized in that: A plurality of spring rods (42) are fixedly arranged between the partition plate (7) and the lower end of the cavity.

8. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 5, characterized in that: The driving mechanism comprises a fixing plate (19), the fixing plate (19) is fixedly arranged at the upper end of the working shell (1), the fixing plate (19) is fixedly connected to the motor (20), the motor (20) is fixedly connected to the driving shaft (18), the driving shaft (18) passes through the upper end of the working shell (1), enters into the flow chamber (16) in the rotating cylinder (15), and is fixedly connected to the air intake fan (17), the upper end of the working shell (1) is penetrated by a vent (10), the vent (10) is communicated with the flow chamber (16), the driving shaft (18) is fixedly connected to the external gear 1 (21), the gear 1 (21) is meshed with the gear 2 (22), the gear 2 (22) is fixedly connected to the threaded sleeve (28), the threaded sleeve (28) passes through the annular groove (9) at the upper end of the working shell (1), enters into the active chamber (4), and is screwed with the threaded rod (29) The threaded rod (29) is connected to the working plate (2), the working plate (2) is fixedly connected to the connecting rod (31), the connecting rod (31) passes through the filter plate (3) and cooperates with the cooperation groove (36) on the upper side of the cooperation block (35), the cooperation groove (36) on the lower side of the cooperation block (35) cooperates with the vertical section of the L-shaped connecting rod (38), the vertical section of the L-shaped connecting rod (38) passes through the lower end of the working shell (1) and is connected to the outside, a spring rod (3) is fixedly provided between the horizontal end of the L-shaped connecting rod (38) and the lower end of the working shell (1), the horizontal section of the L-shaped connecting rod (38) is rotationally connected to the rotating ball (39), the rotating ball (39) is slidably connected to the spiral groove (41) on the rotating shaft (40), and the rotating shaft (40) passes through the lower end of the working shell (1) and the partition plate (7) and is fixedly connected to the rotating cylinder (15).

9. The method for preparing a black masterbatch required for a black agricultural mulch film according to claim 8, characterized in that: The upper side of the connecting rod (31) is fixedly connected to the stirring rod 1 (32), the lower side of the rotating cylinder (15) is provided with the stirring rod 2 (34), the horizontal section of the L-shaped connecting rod (38) is symmetrically provided with the connecting block 1 (48) on the left and right sides, the connecting block 1 (48) passes through the lower end of the working shell (1) and is fixedly connected to the rotating block (49), the rotating block (49) is movably connected to the rotating shaft (40), the rotating block (49) is rotatably connected to the pulling block (47), the pulling block (47) is fixedly connected to the blocking plate (46), and the blocking plate (46) cooperates with the discharge port at the lower end of the rotating cylinder (15).

10. The method for preparing black masterbatch required for black agricultural mulch film according to claim 8, characterized in that: The invention also comprises a switching mechanism, which comprises a rotating sleeve (50), a guide ring groove (55) is provided at the lower end of the rotating sleeve (50), the guide ring groove (55) is slidably connected to the rough block (52), the rough block (52) is fixedly connected to the fixed plate (19) through the mounting block (51), through holes (53) are provided at the upper and lower ends of the rotating sleeve (50), a driving shaft (18) is provided in the through hole (53), the driving shaft (18) is fixedly connected to the rotating block (58), the rotating block (58) is in corresponding contact with the inclined end of the guide block (54), the through hole (53) is communicated with the sliding groove (14), the sliding groove (14) is provided on the rotating sleeve (50), and a plurality of springs (53) are fixedly provided between the guide block (54) and the sliding groove (14). 56), the guide block (54) is fixedly connected to the push rod (57), the push rod (57) passes through the end of the sliding groove (14) away from the through hole (53) and contacts with the external control block (25), the control block (25) is fixedly connected to the second connecting block (27), a plurality of spring rods (30) are fixedly provided between the second connecting block (27) and the right end of the working shell (1), the second connecting block (27) is fixedly connected to the third connecting block (37) and the clamping block (26), the third connecting block (37) passes through the right end of the working shell (1) into the discharge cavity (6) and is slidably connected to the matching block (35), the clamping block (26) is correspondingly matched with the clamping hole (24) on the limit block (23), and the limit block (23) is rotationally connected to the second gear (22).

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