Composite Method of Nano Calcium Carbonate and Polylactic Acid

Abstract

The present invention discloses a composite method of nano calcium carbonate and polylactic acid. The melt blending device used in the composite method includes a base. The inner end of the turntable is fixedly provided with a driving shaft for rotating the mixing chamber. An elastic reciprocating vibration mechanism for reciprocating vibration when the mixing chamber rotates is arranged on the frame plate. A chain-type horizontal driving mechanism for horizontally moving the feeding pipe is arranged on the frame plate. In the present invention, first, through the setting of the chain-type horizontal driving mechanism, when the mixing chamber tumbles and mixes the materials, the feeding pipe can intermittently and repeatedly add raw materials into the mixing chamber, improving the composite effect of nano calcium carbonate and polylactic acid, and achieving the purpose of effectively improving the structure and performance of polylactic acid. Second, through the setting of the elastic reciprocating vibration mechanism, the mixing chamber 3 makes reciprocating vibration during the rotation process, thereby ensuring sufficient mixing between the materials and achieving the purpose of improving the composite efficiency of nano calcium carbonate and polylactic acid.

Description

Technical Field

[0001] The present invention relates to the technical field of nanomaterial composite technology, and particularly to a composite method of nano calcium carbonate and polylactic acid. Background Art

[0002] Filling modification is one of the most common and effective modification methods for polylactic acid. Different from the traditional micron-scale filler filling modification, blending polylactic acid with nanomaterials only requires dispersing a small amount of nanomaterials (mass fraction <5%) in polylactic acid at the nanoscale, which can significantly improve its thermal properties, mechanical properties, etc. Among them, the most studied PLA nanocomposite is the PLA / organically modified montmorillonite (OMLS) nanocomposite, and the strength, thermal properties, barrier properties, flame retardancy, etc. of the prepared PLA / OMLS nanocomposite are greatly improved.

[0003] The nano calcium carbonate / polylactic acid composite material can be prepared by melt blending the modified nano calcium carbonate and polylactic acid. However, due to the poor compatibility between nano calcium carbonate and polylactic acid, the existing smelting equipment for melt blending only realizes the mixing of nano calcium carbonate and polylactic acid through simple rotation, resulting in the difficulty of fully compounding nano calcium carbonate and polylactic acid in a short time. While affecting the composite efficiency of nanomaterials, the properties of the composite material after mixing cannot meet the production requirements of manufacturers. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite method of nano calcium carbonate and polylactic acid to solve the existing problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions: a composite method of nano-calcium carbonate and polylactic acid, and the melt blending device adopted by the composite method includes a base, two sets of frame plates are fixedly arranged at the upper end of the base, a mixing chamber is arranged between the two sets of frame plates, a discharge nozzle for discharging materials is screwed on the mixing chamber, a first driving motor is installed at the outer end of one of the frame plates, the output end of the first driving motor penetrates to the inner side of the frame plate and drives a turntable, a driving shaft for rotating the mixing chamber is fixedly arranged at the inner end of the turntable, a sliding sleeve is fixedly arranged at the side end of the mixing chamber close to the turntable, and the sliding sleeve is sleeved on the outer side of the driving shaft and is slidably connected with the driving shaft. An elastic reciprocating vibration mechanism for reciprocating vibration when the mixing chamber rotates is arranged on the frame plate. A transverse connecting sleeve body is fixedly arranged at the inner end of the other set of frame plates, and the extending end of the transverse connecting sleeve body penetrates into the interior of the mixing chamber. A feeding pipe penetrating the frame plate is slidably connected inside the transverse connecting sleeve body. Two partition plates are fixedly arranged inside the feeding pipe, and the interior of the feeding pipe is partitioned into two chambers by the partition plates. A storage chamber is installed at the upper end of the base. Two feeding pipes for conveying two different materials are communicated between the storage chamber and the feeding pipe, and the two feeding pipes are respectively communicated with the two different chambers. A pump body for pumping materials is installed inside the storage chamber. A chain-type horizontal driving mechanism for horizontally moving the feeding pipe is arranged on the frame plate.

[0006] As a further description of the above technical solution:

[0007] A plurality of limiting teeth distributed in a ring shape are fixedly arranged at the outer end of the driving shaft, and a limiting groove for cooperating with the limiting teeth to slide is arranged inside the sliding sleeve.

[0008] As a further description of the above technical solution:

[0009] The elastic reciprocating vibration mechanism includes a butting sleeve, a docking sleeve, a docking disc and a compression spring. Docking discs are rotatably connected to the outer sides of the sliding sleeve and the turntable, and a compression spring is sleeved between the two docking discs on the outer side of the driving shaft.

[0010] As a further description of the above technical solution:

[0011] A docking sleeve is fixedly arranged at one end of the mixing chamber away from the sliding sleeve, a butting sleeve coaxially distributed with the docking sleeve is fixedly arranged at the inner end of the frame plate close to the docking sleeve, and the end faces of the docking sleeve and the butting sleeve in contact are of a mutually matching wavy structure.

[0012] As a further description of the above technical solution:

[0013] A second feeding nozzle communicating with the mixing chamber is opened inside the transverse connecting sleeve body, and two first feeding nozzles adapted to the second feeding nozzle are opened inside the feeding pipe.

[0014] As a further description of the above technical solution:

[0015] Two groups of holding rods are fixedly arranged at the outer end of the feeding pipe, and baffles are fixedly arranged at the extending ends of the two groups of holding rods through the outside of the transverse connecting sleeve.

[0016] As a further description of the above technical solution:

[0017] The chain-type horizontal driving mechanism includes a second driving motor, a first driving pulley, a second driving pulley, a driven pulley and a transmission chain. Two groups of vertically distributed second driving motors are installed at the inner end of the frame plate, and the output ends of the two groups of second driving motors penetrate to the outer end of the frame plate and are respectively drivingly connected with the first driving pulley and the second driving pulley.

[0018] As a further description of the above technical solution:

[0019] A driven pulley is rotatably connected to the outer end of the frame plate on the outside of the feeding pipe, and transmission chains for cooperative transmission are sleeved on the outside of the driven pulley, the first driving pulley and the second driving pulley.

[0020] As a further description of the above technical solution:

[0021] A slider is fixedly arranged at the inner end of the driven pulley, and a slide rail for cooperating with the slider to slide is arranged inside the feeding pipe, and the slide rail is spirally distributed on the feeding pipe.

[0022] As a further description of the above technical solution:

[0023] The composite method includes the following steps:

[0024] S1. Put nano calcium carbonate and polylactic acid into the storage chamber, start the pump body in the storage chamber, and send nano calcium carbonate and polylactic acid to two different chambers inside the feeding pipe through the feeding pipes respectively;

[0025] S2. Start the chain-type horizontal driving mechanism to drive the feeding pipe to move horizontally, align the first feeding nozzle with the second feeding nozzle, and put nano calcium carbonate and polylactic acid into the mixing chamber;

[0026] S3. Start the first driving motor at the outer end of the frame plate to drive the mixing chamber to rotate. During the rotation of the mixing chamber, under the action of the elastic reciprocating vibration mechanism, it vibrates reciprocally along the horizontal direction, so that nano calcium carbonate and polylactic acid are fully melted and mixed;

[0027] S4. Let the mixing chamber stand still to cool the molten mixture of nano calcium carbonate and polylactic acid composite;

[0028] S5. Open the discharge nozzle, take out the cooled composite material from the mixing chamber, and complete the preparation of the nano composite material.

[0029] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0030] 1. In the present invention, a driven wheel disc, a second drive motor, a first wheel disc, a second wheel disc, and a feeding pipe are provided on the frame plate. A transmission chain is provided between the driven wheel disc and the first wheel disc and the second wheel disc. When the second drive motor is started to drive the first wheel disc to rotate, at this time, the slider fixed at the inner end of the driven wheel disc slides along the slide rail, so that the feeding pipe moves horizontally. The two second drive motors drive the first wheel disc and the second wheel disc to rotate in opposite directions respectively, so that the driven wheel disc can drive the feeding pipe to move in two opposite directions, realizing that the feeding pipe intermittently and repeatedly adds raw materials into the mixing chamber, improving the compounding effect of nano-calcium carbonate and polylactic acid, achieving the purpose of effectively improving the structure and performance of polylactic acid, reducing the cost of polylactic acid, and at the same time expanding the application range of nano-calcium carbonate.

[0031] 2. In the present invention, a first drive motor, a turntable, and an abutting sleeve are provided on the frame plate. A drive shaft is provided on the turntable. A docking sleeve and a sliding sleeve are provided on the mixing chamber. A docking disc is provided on the turntable and the sliding sleeve. A compression spring is provided between the docking discs. When the first drive motor is started to drive the drive shaft to rotate, the sliding sleeve drives the mixing chamber to rotate. Through the setting of the elastic reciprocating vibration mechanism, the mixing chamber makes reciprocating vibrations during the rotation process, so as to ensure full mixing between the materials, achieving the purpose of improving the compounding efficiency of nano-calcium carbonate and polylactic acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shows a front view according to an embodiment of the present invention;

[0033] Figure 2 Shows a side view according to an embodiment of the present invention;

[0034] Figure 3 Shows a cross-sectional view according to an embodiment of the present invention;

[0035] Figure 4 Shows a cross-sectional view of the connection between the feeding pipe and the horizontal connection sleeve body according to an embodiment of the present invention;

[0036] Figure 5 Shows a side cross-sectional view of the connection between the sliding sleeve and the drive shaft according to an embodiment of the present invention.

[0037] Legend Explanation:

[0038] 1. Base; 2. Shelf board; 3. Kneading bin; 4. Discharge nozzle; 5. First driving motor; 6. Turntable; 7. Docking plate; 8. Driving shaft; 801. Limiting teeth; 9. Sliding sleeve; 901. Limiting groove; 10. Compression spring; 11. Contact sleeve; 12. Docking sleeve; 13. Second driving motor; 14. First round plate; 15. Second round plate; 16. Driven wheel plate; 1601. Slide block; 17. Transmission chain; 18. Feeding pipe; 1801. Slide rail; 1802. First feeding nozzle; 19. Storage chamber; 20. Feeding pipe; 21. Holding rod; 22. Baffle; 23. Horizontal connection sleeve body; 2301. Second feeding nozzle; 24. Partition board. Detailed implementation manners

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1-5, the present invention provides a technical solution: a composite method of nano calcium carbonate and polylactic acid. The melt blending device used in the composite method includes a base 1. Two sets of support plates 2 are fixedly arranged at the upper end of the base 1. A mixing chamber 3 is arranged between the two sets of support plates 2. A discharge nozzle 4 for discharging materials is screwed on the mixing chamber 3. A first driving motor 5 is installed at the outer end of one set of support plates 2. The output end of the first driving motor 5 penetrates to the inner side of the support plate 2 and drives a turntable 6. A driving shaft 8 for rotating the mixing chamber 3 is fixedly arranged at the inner end of the turntable 6. A sliding sleeve 9 is fixedly arranged at the side end of the mixing chamber 3 close to the turntable 6. The sliding sleeve 9 is sleeved on the outer side of the driving shaft 8 and is slidably connected with the driving shaft 8. An elastic reciprocating vibration mechanism for making the mixing chamber 3 reciprocate and vibrate when rotating is arranged on the support plate 2. A transverse connecting sleeve body 23 is fixedly arranged at the inner end of the other set of support plates 2. The extending end of the transverse connecting sleeve body 23 penetrates into the interior of the mixing chamber 3. A feeding pipe 18 penetrating the support plate 2 is slidably connected inside the transverse connecting sleeve body 23. Two partition plates 24 are fixedly arranged inside the feeding pipe 18. The partition plates 24 divide the interior of the feeding pipe 18 into two chambers. A storage chamber 19 is installed at the upper end of the base 1. Two feeding pipes 20 for conveying two different materials are communicated between the storage chamber 19 and the feeding pipe 18. The two feeding pipes 20 are respectively communicated with the two different chambers. A pump body for pumping materials is installed inside the storage chamber 19. A chain-type horizontal driving mechanism for making the feeding pipe 18 move horizontally is arranged on the support plate 2. Put nano calcium carbonate and polylactic acid into the storage chamber 19. Start the pump body in the storage chamber 19. Send nano calcium carbonate and polylactic acid into two different chambers inside the feeding pipe 18 through the feeding pipes 20 respectively. Then, start the chain-type horizontal driving mechanism to drive the feeding pipe 18 to move horizontally along the horizontal direction, so that the first feeding nozzle 1802 is aligned with the second feeding nozzle 2301, and put nano calcium carbonate and polylactic acid into the mixing chamber 3. At this time, start the first driving motor 5 at the outer end of the support plate 2 to drive the mixing chamber 3 to rotate. During the rotation of the mixing chamber 3, under the action of the elastic reciprocating vibration mechanism, it reciprocates and vibrates along the horizontal direction, so that nano calcium carbonate and polylactic acid are fully melted and mixed. Through the setting of the chain-type horizontal driving mechanism, when the mixing chamber 3 tumbles and mixes materials, the feeding pipe 18 can intermittently and repeatedly add raw materials into the mixing chamber 3 for many times, improving the composite effect of nano calcium carbonate and polylactic acid, achieving the purpose of effectively improving the structure and performance of polylactic acid, reducing the cost of polylactic acid, and at the same time expanding the application range of nano calcium carbonate. Secondly, through the setting of the elastic reciprocating vibration mechanism, the mixing chamber 3 makes reciprocating vibrations during the rotation process, thereby ensuring full mixing between materials and achieving the purpose of improving the composite efficiency of nano calcium carbonate and polylactic acid.

[0041] Specifically, such as Figure 1 , Figure 3 , Figure 4 and Figure 5As shown in the figure, a plurality of groups of limiting teeth 801 distributed in a ring are fixedly arranged at the outer end of the driving shaft 8. The inside of the sliding sleeve 9 has a limiting groove 901 for sliding and cooperating with the limiting teeth 801. The elastic reciprocating vibration mechanism includes an abutting sleeve 11, a docking sleeve 12, a docking disc 7 and a compression spring 10. Docking discs 7 are rotatably connected to the outer sides of the sliding sleeve 9 and the turntable 6. A compression spring 10 is sleeved on the outer side of the driving shaft 8 between the two docking discs 7. A docking sleeve 12 is fixedly arranged at one end of the mixing bin 3 away from the sliding sleeve 9. An abutting sleeve 11 coaxially distributed with the docking sleeve 12 is fixedly arranged at the inner end of a group of support plates 2 close to the docking sleeve 12. The end faces of the docking sleeve 12 and the abutting sleeve 11 in contact are of a mutually cooperating wavy structure. Start the first driving motor 5 installed at the outer end of the support plate 2 to drive the turntable 6 and the driving shaft 8 fixedly connected to the turntable 6 to rotate. Then, the sliding sleeve 9 sleeved on the outer side of the driving shaft 8 drives the mixing bin 3 to rotate. During the rotation of the docking sleeve 12 fixed to the side end of the mixing bin 3, it will move horizontally by abutting and pressing against the end face of the abutting sleeve 11. As the docking sleeve 12 continues to rotate, the notch part of the docking sleeve 12 will coincide with the protruding part of the abutting sleeve 11 again, and the mixing bin 3 will bounce back to the initial position under the action of the compression spring 10. Through the setting of the elastic reciprocating vibration mechanism, the mixing bin 3 makes reciprocating elastic vibrations during the rotation process.

[0042] Specifically, as Figure 3 and Figure 4 shown in the figure, a second material conveying nozzle 2301 communicating with the mixing bin 3 is arranged inside the transverse connecting sleeve body 23. Two first material conveying nozzles 1802 adapted to the second material conveying nozzle 2301 are arranged inside the feeding pipe 18. Two holding rods 21 are fixedly arranged at the outer end of the feeding pipe 18. The extending ends of the two holding rods 21 penetrate to the outside of the transverse connecting sleeve body 23 and are fixedly provided with a baffle 22. Start the chain horizontal driving mechanism to drive the feeding pipe 18 to move horizontally. When one of the first material conveying nozzles 1802 is aligned with the second material conveying nozzle 2301, the materials placed in this chamber will be successively put into the mixing bin 3 through the first material conveying nozzle 1802 and the second material conveying nozzle 2301. The holding rods 21 are arranged so that when the driven wheel disc 16 drives the feeding pipe 18, the feeding pipe 18 will not rotate therewith, thereby ensuring the stable transmission of the driven wheel disc 16 to the feeding pipe 18. The baffle 22 is arranged to limit the moving range of the feeding pipe 18.

[0043] Specifically, as Figures 1-4As shown in the figure, the chain-type horizontal driving mechanism includes a second driving motor 13, a first driving pulley 14, a second driving pulley 15, a driven pulley 16 and a transmission chain 17. Two sets of vertically distributed second driving motors 13 are installed at the inner end of the frame plate 2. The output ends of the two sets of second driving motors 13 penetrate to the outer end of the frame plate 2 and are respectively drivingly connected with the first driving pulley 14 and the second driving pulley 15. A driven pulley 16 is rotatably connected to the outer end of the frame plate 2 on the outside of the feeding pipe 18. Transmission chains 17 for cooperative transmission are sleeved on the outside of the driven pulley 16, the first driving pulley 14 and the second driving pulley 15. A slider 1601 is fixedly provided at the inner end of the driven pulley 16. A slide rail 1801 for cooperating with the slider 1601 to slide is provided inside the feeding pipe 18, and the slide rail 1801 is spirally distributed on the feeding pipe 18. Start a set of second driving motors 13 installed at the inner end of the frame plate 2 to drive the first driving pulley 14 to rotate. During the rotation of the first driving pulley 14, the driven pulley 16 is driven to rotate through the transmission chain 17. At this time, the slider 1601 fixedly provided at the inner end of the driven pulley 16 will slide along the slide rail 1801 inside the feeding pipe 18. Through the sliding cooperation of the slide rail 1801 and the slider 1601, the feeding pipe 18 is moved horizontally. The two sets of second driving motors 13 drive the first driving pulley 14 and the second driving pulley 15 to rotate in opposite directions respectively, so that the driven pulley 16 can drive the feeding pipe 18 to move in two opposite directions, realizing the step-by-step feeding of two different materials.

[0044] Specifically, the compounding method includes the following steps:

[0045] S1. Put nano calcium carbonate and polylactic acid into the storage chamber 19, start the pump body in the storage chamber 19, and send the nano calcium carbonate and polylactic acid to two different chambers inside the feeding pipe 18 through the feeding pipes 20 respectively;

[0046] S2. Start the chain-type horizontal driving mechanism to drive the feeding pipe 18 to move horizontally, so that the first feeding nozzle 1802 is aligned with the second feeding nozzle 2301, and put the nano calcium carbonate and polylactic acid into the mixing chamber 3;

[0047] S3. Start the first driving motor 5 at the outer end of the frame plate 2 to drive the mixing chamber 3 to rotate. During the rotation of the mixing chamber 3, it reciprocates horizontally under the action of the elastic reciprocating vibration mechanism, so that the nano calcium carbonate and polylactic acid are fully melted and mixed;

[0048] S4. Let the mixing chamber 3 stand still to cool the molten and mixed nano calcium carbonate and polylactic acid composite;

[0049] S5. Open the discharge nozzle, take out the cooled composite material from the mixing chamber 3, and complete the preparation of the nano composite material.

[0050] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A composite method of nano calcium carbonate and polylactic acid, characterized in that The melt blending device used in the composite method includes a base (1). At the upper end of the base (1), two sets of frame plates (2) are fixedly installed. A mixing chamber (3) is arranged between the two sets of frame plates (2). A discharge nozzle (4) for discharging materials is screwed on the mixing chamber (3). At the outer end of one set of frame plates (2), a first driving motor (5) is installed. The output end of the first driving motor (5) penetrates to the inner side of the frame plate (2) and drives a turntable (6). At the inner end of the turntable (6), a driving shaft (8) for rotating the mixing chamber (3) is fixedly installed. A sliding sleeve (9) is fixedly installed at the side end of the mixing chamber (3) close to the turntable (6). The sliding sleeve (9) is sleeved on the outer side of the driving shaft (8) and is slidably connected to the driving shaft (8). An elastic reciprocating vibration mechanism for reciprocating vibration when the mixing chamber (3) rotates is arranged on the frame plate (2). At the inner end of the other set of frame plates (2), a transverse connecting sleeve body (23) is fixedly installed, and the extending end of the transverse connecting sleeve body (23) penetrates into the interior of the mixing chamber (3). A feeding pipe (18) penetrating the frame plate (2) is slidably connected inside the transverse connecting sleeve body (23). Two partition plates (24) are fixedly installed inside the feeding pipe (18). The partition plates (24) divide the interior of the feeding pipe (18) into two chambers. A storage chamber (19) is installed at the upper end of the base (1). Two feeding pipes (20) for conveying two different materials are communicated between the storage chamber (19) and the feeding pipe (18), and the two feeding pipes (20) are respectively communicated with the two different chambers. A pump body for pumping materials is installed inside the storage chamber (19). A chain-type horizontal driving mechanism for horizontally moving the feeding pipe (18) is arranged on the frame plate (2). A second feeding nozzle (2301) communicating with the mixing chamber (3) is opened inside the transverse connecting sleeve body (23). Two first feeding nozzles (1802) adapted to the second feeding nozzle (2301) are opened inside the feeding pipe (18). The chain-type horizontal driving mechanism includes a second driving motor (13), a first round plate (14), a second round plate (15), a driven wheel plate (16) and a transmission chain (17). Two second driving motors (13) distributed vertically are installed at the inner end of the frame plate (2). The output ends of the two second driving motors (13) penetrate to the outer side of the frame plate (2) and are respectively drivingly connected with the first round plate (14) and the second round plate (15). A driven wheel plate (16) is rotatably connected to the outer side of the frame plate (2) and located outside the feeding pipe (18). A transmission chain (17) for cooperative transmission is sleeved on the outer sides of the driven wheel plate (16), the first round plate (14) and the second round plate (15). A slider (1601) is fixedly installed at the inner end of the driven wheel plate (16). A slide rail (1801) for sliding the slider (1601) is opened inside the feeding pipe (18), and the slide rail (1801) is spirally distributed on the feeding pipe (18).

2. The composite method of nano calcium carbonate and polylactic acid according to claim 1, wherein The outer end of the drive shaft (8) is fixedly provided with multiple groups of limit teeth (801) distributed in a ring shape, and the inside of the sliding sleeve (9) has a limit groove (901) for sliding in cooperation with the limit teeth (801).

3. The composite method of nano calcium carbonate and polylactic acid according to claim 2, characterized in that The elastic reciprocating vibration mechanism includes an abutting sleeve (11), a docking sleeve (12), a docking disc (7) and a compression spring (10). Docking discs (7) are rotatably connected to the outer sides of the sliding sleeve (9) and the turntable (6), and a compression spring (10) is sleeved on the outer side of the drive shaft (8) between the two docking discs (7).

4. The composite method of nano-calcium carbonate and polylactic acid according to claim 3, characterized in that, One end of the mixing chamber (3) away from the sliding sleeve (9) is fixedly provided with a docking sleeve (12), and the inner end of a set of the support plates (2) close to the docking sleeve (12) is fixedly provided with an abutting sleeve (11) coaxially distributed with the docking sleeve (12), and the end faces of the docking sleeve (12) and the abutting sleeve (11) in contact with each other have a mutually matching wavy structure.

5. The composite method of nano calcium carbonate and polylactic acid according to claim 4, wherein Two holding rods (21) are fixedly provided at the outer end of the feeding pipe (18), and the extending ends of the two holding rods (21) penetrate to the outside of the horizontal connecting sleeve body (23) and are fixedly provided with a baffle (22).

6. The composite method of nano calcium carbonate and polylactic acid according to claim 5, characterized in that The composite method includes the following steps: S1. Put nano calcium carbonate and polylactic acid into the storage chamber (19), start the pump body in the storage chamber (19), and respectively send the nano calcium carbonate and polylactic acid to two different chambers inside the feeding pipe (18) through the feeding pipes (20); S2. Start the chain-type horizontal drive mechanism to drive the feeding pipe (18) to move horizontally, align the first feeding nozzle (1802) with the second feeding nozzle (2301), and put the nano calcium carbonate and polylactic acid into the mixing chamber (3); S3. Start the first drive motor (5) at the outer end of the support plate (2) to drive the mixing chamber (3) to rotate. During the rotation of the mixing chamber (3), under the action of the elastic reciprocating vibration mechanism, it reciprocates horizontally, so that the nano calcium carbonate and polylactic acid are fully melted and mixed; S4. Let the mixing chamber (3) stand still to cool the molten nano calcium carbonate and polylactic acid composite; S5. Open the discharge nozzle, take out the cooled composite material from the mixing chamber (3), and complete the preparation of the nano composite material.

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