Preparation method of wear-resistant antibacterial polylactic acid composite fiber

Abstract

The invention relates to the technical field of polylactic acid fiber production, in particular to a preparation method of a wear-resistant antibacterial polylactic acid composite fiber, which comprises the following steps: S1, putting mixed antibacterial powder and polylactic acid into a transfer cylinder, putting paraffin into a material conveying pipe, driving a first spiral blade and a second spiral blade to rotate by the material conveying pipe, collecting the mixed powder, and transferring the mixed powder into the transfer cylinder; powder overflow is limited; s2, the mixed powder penetrates through a top plate to enter a material mixing cavity, and a material scattering pipe rotates along with a material conveying pipe and throws paraffin particles; s3, the bottom plate gets close to the top plate to extrude the mixed powder and the paraffin, so that the powder and the paraffin are tightly combined; and S4, the bottom plate is opened, and the fully-mixed materials in the material mixing cavity are put into an extruder. The first spiral blade guides powder to move and limits dust raising, the second spiral blade captures particles in air, the material scattering pipe scatters paraffin particles, and the bottom plate and the top plate cooperate to extrude materials, so that the materials and the paraffin particles are bonded, and follow-up extrusion work is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of polylactic acid fiber production, and in particular to a preparation method of wear-resistant and antibacterial polylactic acid composite fiber. Background Art

[0002] Polylactic acid composite fiber, also known as poly(lactic acid) fiber, is a new type of biodegradable material with biocompatibility and degradability, and is widely used in the fields of medical treatment, hygiene, clothing, etc.

[0003] According to the production method of an antibacterial polylactic acid fiber disclosed in the publication (announcement) number CN100422405C, the publication (announcement) date is October 1, 2008, which includes the following steps: ① Antibacterial powder treatment: An inorganic silver-containing ultrafine antibacterial powder with an average particle size of 0.05 to 1.0 micrometers is dried at 100 to 200 °C for 1 to 10 hours, and then kneaded with a surface treatment agent containing both lipophilic and hydrophilic groups in a kneader, and then dried for the second time, the drying temperature is 80 to 160 °C, and the time is 1 to 5 hours; ② Preparation of antibacterial masterbatch: The polylactic acid chips are crushed into granules and dried at 80 to 110 °C for 10 to 24 hours, and then mixed with the antibacterial powder treated in step ①. The addition amount of the antibacterial powder accounts for 5 to 60% of the weight of the polylactic acid chips. Then, a lubricant with a weight of 1 to 10% of the weight of the antibacterial powder is added, and it is injected into a twin-screw extruder to extrude and granulate to make an antibacterial polylactic acid masterbatch. The screw processing temperature is 190 to 260 °C; ③ Manufacture of polylactic acid antibacterial fiber: The ordinary polylactic acid chips and the antibacterial masterbatch prepared in step ② are respectively dried at a temperature of 80 to 150 °C for 10 to 24 hours, and after metering, they are injected into the spinning box for spinning according to the ratio of 5 to 100 parts by weight of ordinary polylactic acid chips per part by weight of the antibacterial masterbatch. The spinning temperature is 200 to 300 °C, and the spinning winding speed is

[0004] 800 to 4000 m / min. The as-spun fiber is then processed after drawing to make an antibacterial polylactic acid fiber. The drawing speed is 800 to 1200 m / min, the temperature of the hot disk is 70 to 90 °C, and the temperature of the hot plate is 120 to 135 °C. This method has the following advantages: good spinning forming, excellent fiber quality; the product has broad-spectrum antibacterial property and is durable and washable. Its antibacterial rate against Staphylococcus aureus exceeds 60.0%, and its antibacterial rate against Candida albicans exceeds 90.0%; its production raw materials come from natural renewable green plants, and the product is biodegradable, belonging to green environmental protection and healthy fiber.

[0005] In the prior art including the above patents, during the production of wear-resistant and antibacterial polylactic acid fibers, antibacterial powder needs to be prepared first, then the antibacterial powder is mixed with polylactic acid, and then a lubricant is added to bond the antibacterial powder and polylactic acid together. Then, it is extruded into pellets by an extruder to make an antibacterial masterbatch. Then, the antibacterial masterbatch and polylactic acid chips are spun in a spinning box according to a ratio to obtain antibacterial polylactic acid composite fibers. In order to fully mix the antibacterial powder and polylactic acid, these two powders are generally mixed in a high-speed powder stirring mixer. The lubricant is generally #60 paraffin. Since paraffin has a low melting point, is relatively soft and has a certain viscosity, it cannot be mixed with the antibacterial powder and polylactic acid in the high-speed powder stirring mixer and needs to be mixed separately. And since both of these two powders of antibacterial powder and polylactic acid are micron-sized, conventional low-speed mixing methods are prone to powder scattering, which not only wastes materials but also affects the health of workers. Summary of the Invention

[0006] The object of the present invention is to provide a preparation method of wear-resistant and antibacterial polylactic acid composite fibers, aiming to solve the above problems.

[0007] To achieve the above object, the present invention provides a preparation method of wear-resistant and antibacterial polylactic acid composite fibers, including a transfer cylinder. A feed pipe is rotatably arranged on the transfer cylinder. A mixing chamber with its upper and lower ends respectively closed by a top plate and a bottom plate is arranged at the bottom of the transfer cylinder. The middle part of the feed pipe is provided with a first spiral blade with its side tightly attached to the inner wall of the transfer cylinder and spiraling downward, and a second spiral blade located on the first spiral blade and having the opposite spiral direction. The bottom of the feed pipe is movably provided with a spreading pipe extending into the mixing chamber. The method further includes the following steps:

[0008] S1. Put the mixed antibacterial powder and polylactic acid into the transfer cylinder, put paraffin into the feed pipe, and the feed pipe drives the first spiral blade and the second spiral blade to rotate, gathering the mixed powder and restricting the powder from overflowing.

[0009] S2. The mixed powder passes through the top plate and enters the mixing chamber, and the spreading pipe rotates with the feed pipe and sprinkles paraffin particles.

[0010] S3. The bottom plate moves closer to the top plate to squeeze the mixed powder and paraffin, so that the powder and paraffin are tightly combined.

[0011] S4. The bottom plate is opened to put the fully mixed material in the mixing chamber into the extruder.

[0012] Preferably, the number of spiral turns of the first spiral blade is greater than 2.

[0013] Preferably, the number of spiral turns of the second spiral blade is 0.5.

[0014] Preferably, the material spreading pipe is coupled with the side wall of the mixing chamber so as to rotate with the material conveying pipe and reciprocate up and down.

[0015] Preferably, a plurality of second guide grooves which are connected in sequence and used for guiding the movement of the material spreading pipe are formed in the inner wall of the mixing chamber.

[0016] Preferably, an impeller for pushing materials is arranged inside the material spreading pipe, and the material spreading pipe moves along the second guide groove to make the impeller rotate.

[0017] Preferably, a baffle which is used for shielding the discharge port on the material spreading pipe and faces the opposite direction of the rotation direction of the material spreading pipe is arranged on the material spreading pipe.

[0018] Preferably, an installation frame for supporting the bottom plate is slidably arranged inside the transfer cylinder, and the material conveying pipe rotates to make the installation frame reciprocate up and down.

[0019] Preferably, the bottom plate is composed of a plurality of sector blocks, and a first guiding slope and a second guiding slope for guiding the plurality of sector blocks to approach each other are arranged at the bottom of the mixing chamber.

[0020] Preferably, a channel for the powder to pass through is formed in the top plate, and the installation frame moves to the connection position of the first guiding slope and the second guiding slope to open the channel.

[0021] In the above technical solution, a preparation method of a wear-resistant and antibacterial polylactic acid composite fiber provided by the present invention has the following beneficial effects: When producing the antibacterial masterbatch, the antibacterial powder and polylactic acid are first put into a high-speed powder stirring and mixing machine in proportion and fully mixed therein. Then, the mixed powder is put into the transfer cylinder from the feed port, and the feed port is sealed to prevent the powder from escaping. At this time, the output torque of the motor drives the driving wheel to rotate, and the driving wheel drives the feed pipe to rotate through the transmission wheel engaged therewith. The feed pipe drives the first spiral blade and the second spiral blade to rotate. The first spiral blade pushes the material to move downward, and a spiral downward channel is formed by the first spiral blade and the inner wall of the transfer cylinder to guide the movement of the material while restricting the upward movement of the dust generated during the movement of the material. At the same time, since the spiral direction of the second spiral blade is opposite to that of the first spiral blade, the second spiral blade will collide with the air in the upper half chamber of the transfer cylinder during the rotation with the first spiral blade, thereby promoting the settlement of the powder in the air and improving the utilization rate of the material. The material moves downward along the transfer cylinder and enters the mixing chamber through the channel on the top plate. At this time, paraffin particles are put into the feed pipe, and the paraffin particles enter the spreading pipe along the feed pipe. The spreading pipe rotates with the feed pipe to sprinkle the paraffin particles, so that the paraffin particles are fully mixed with the powder material. At the same time, the bottom plate moves closer to the top plate, compressing the internal space of the mixing chamber and squeezing the material, so that the powder material is tightly combined with the adjacent paraffin particles, reducing the dust generated during the subsequent movement of the material. After the mixing work is completed, the bottom plate moves downward and gradually leaves the mixing chamber. At this time, the material in the mixing chamber falls into the extruder, and the extruder extrudes the material into particles to manufacture the antibacterial masterbatch. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure provided by an embodiment of the present invention;

[0025] Figure 3 It is a schematic cross-sectional structure diagram of the mixing chamber provided by an embodiment of the present invention;

[0026] Figure 4 For Figure 3 the enlarged view at A in

[0027] Figure 5 For Figure 3 the enlarged view at B in

[0028] Figure 6 Schematic diagram of the internal structure of the feeding pipe provided by the embodiment of the present invention;

[0029] Figure 7 is Figure 6 Enlarged view at position C in;

[0030] Figure 8 Schematic diagram of the internal structure of the connecting pipe provided by the embodiment of the present invention;

[0031] Figure 9 Schematic diagram of the structure of the material spreading pipe provided by the embodiment of the present invention;

[0032] Figure 10 Schematic diagram of the internal structure of the material spreading pipe provided by the embodiment of the present invention;

[0033] Figure 11 is Figure 10 Enlarged view at position D in;

[0034] Figure 12 Schematic diagram of the structure of the turntable provided by the embodiment of the present invention;

[0035] Figure 13 Schematic diagram of the unfolded structure of the side wall of the mixing chamber provided by the embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] 1, transfer cylinder; 11, feeding pipe; 111, first spiral blade; 112, second spiral blade; 113, material pushing plate; 114, driving wheel; 115, turntable; 116, slider; 117, first cable; 12, connecting pipe; 121, synchronization block; 122, material spreading pipe; 123, baffle; 124, impeller; 125, guide block; 126, first gear; 127, second gear; 128, material pushing plate; 129, pressure relief valve; 13, mixing chamber; 131, top plate; 132, sealing ring; 133, mounting frame; 134, bottom plate; 135, push rod; 136, movable block; 137, second cable; 138, first guiding slope; 139, second guiding slope; 141, first guide groove; 142, second guide groove; 143, inner ring; 144, outer ring; 145, first inclined groove; 146, second inclined groove; 147, third inclined groove; 15, feeding port. Detailed implementation manners

[0038] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0039] Such as Figures 1-13As shown in the figure, a preparation method of wear-resistant and antibacterial polylactic acid composite fiber includes a transfer cylinder 1. A feeding pipe 11 is rotatably arranged on the transfer cylinder 1. A mixing chamber 13 with its upper and lower ends closed by a top plate 131 and a bottom plate 134 respectively is arranged at the bottom of the transfer cylinder 1. In the middle of the feeding pipe 11, there is a first spiral blade 111 with its side closely attached to the inner wall of the transfer cylinder 1 and spiraling downward, and a second spiral blade 112 located on the first spiral blade 111 and having an opposite spiral direction. A spreading pipe 122 extending into the mixing chamber 13 is movably arranged at the bottom of the feeding pipe 11. The method also includes the following steps:

[0040] S1. Put the mixed antibacterial powder and polylactic acid into the transfer cylinder 1, put paraffin into the feeding pipe 11, and the feeding pipe 11 drives the first spiral blade 111 and the second spiral blade 112 to rotate to gather the mixed powder and prevent the powder from overflowing;

[0041] S2. The mixed powder passes through the top plate 131 and enters the mixing chamber 13. The spreading pipe 122 rotates with the feeding pipe 11 and sprinkles paraffin particles;

[0042] S3. The bottom plate 134 moves closer to the top plate 131 to squeeze the mixed powder and paraffin, so that the powder and paraffin are tightly combined;

[0043] S4. The bottom plate 134 is opened to put the fully mixed material in the mixing chamber 13 into the extruder.

[0044] Specifically, a feeding port 15 is opened at the top of the transfer cylinder 1. A motor is arranged at the top of the transfer cylinder 1. A driving wheel is arranged at the output end of the motor. A transmission wheel 114 meshing with the driving wheel is arranged on the feeding pipe 11. A closable passage for the material to pass through is opened on the top plate 131.

[0045] In the above technical solution, when producing the antibacterial masterbatch, the antibacterial powder and polylactic acid are first put into a high-speed powder stirring and mixing machine in proportion and fully mixed therein. Then, the mixed powder is put into the transfer cylinder 1 through the feed port 15, and the feed port 15 is sealed to prevent the powder from escaping. At this time, the output torque of the motor drives the driving wheel to rotate, and the driving wheel drives the feeding pipe 11 to rotate through the transmission wheel 114 engaged therewith. The feeding pipe 11 drives the first spiral blade 111 and the second spiral blade 112 to rotate. The first spiral blade 111 pushes the material to move downward, and a spiral downward channel is formed by the enclosure of the first spiral blade 111 and the inner wall of the transfer cylinder 1, guiding the material to move while restricting the upward movement of the dust generated during the movement of the material. At the same time, since the spiral direction of the second spiral blade 112 is opposite to that of the first spiral blade 111, the second spiral blade 112 will collide with the air in the upper half chamber of the transfer cylinder 1 during the rotation following the first spiral blade 111, thereby promoting the settlement of the powder in the air, and then improving the utilization rate of the material. The material moves downward along the transfer cylinder 1 and enters the mixing chamber 13 through the channel on the top plate 131. At this time, paraffin particles are put into the feeding pipe 11, and the paraffin particles enter the spreading pipe 122 along the feeding pipe 11. The spreading pipe 122 rotates with the feeding pipe 11 to sprinkle the paraffin particles, so that the paraffin particles are fully mixed with the powder material. At the same time, the bottom plate 134 moves closer to the top plate 131, compressing the internal space of the mixing chamber 13 and squeezing the material at the same time, so that the powder material is tightly combined with the adjacent paraffin particles, reducing the dust generated during the subsequent movement of the material. After the mixing work is completed, the bottom plate 134 moves downward and gradually leaves the mixing chamber 13. At this time, the material in the mixing chamber 13 falls into the extruder, and the extruder extrudes the material into particles to manufacture the antibacterial masterbatch.

[0046] As a further embodiment provided by the present invention, the number of spiral turns of the first spiral blade 111 is greater than 2.

[0047] Specifically, the number of spiral turns of the channel formed by the first spiral blade 111 and the inner wall of the transfer cylinder 1 is greater than 2. The spiral channel is used to extend the moving path of the dust, which not only ensures that the material can move downward smoothly, but also increases the possibility of the dust colliding with the spiral channel, thereby increasing the possibility of the dust colliding with the spiral channel and settling, and improving the material utilization efficiency.

[0048] As yet another further embodiment provided by the present invention, the number of spiral turns of the second spiral blade 112 is 0.5.

[0049] Specifically, the second spiral blade 112 is relatively short and does not completely cover the top of the first spiral blade 111, which can ensure that most of the material falling from above can directly contact the first spiral blade 111 and be guided downward by the first spiral blade 111, and the other part of the material will also move along the inclined second spiral blade 112 to the first spiral blade 111 and then converge with other materials.

[0050] Further, in the above embodiments, an intermittently operating electrostatic generator may be connected to the second spiral blade 112. The second spiral blade 112 is charged with static electricity by the electrostatic generator. When the second spiral blade 112 rotates, it can adsorb the powder in the air through static electricity. When the electrostatic generator stops working, the static electricity on the second spiral blade 112 gradually decays, and the powder adhering to it can fall onto the first spiral blade 111 along the second spiral blade 112 and move downward along the first spiral blade 111.

[0051] As another embodiment further provided by the present invention, the material spreading pipe 122 is coupled to the side wall of the mixing chamber 13 so that it rotates with the material conveying pipe 11 and reciprocates up and down.

[0052] Specifically, a connecting pipe 12 for supporting the material spreading pipe 122 is slidably arranged at the bottom of the material spreading pipe 122, and the material spreading pipe 122 is arranged obliquely downward. A square synchronous block 121 is arranged on the connecting pipe 12, and a chute adapted to the synchronous block 121 is opened on the inner wall of the material spreading pipe 122. A slope is arranged inside the connecting pipe 12, and the slope guides the paraffin particles into the material spreading pipe 122.

[0053] Further, during the rotation of the material spreading pipe 122, the material spreading pipe 122 drives the connecting pipe 12 to rotate through the synchronous block 121. The material spreading pipe 122 rotates with the connecting pipe 12 and the material conveying pipe 11 is coupled to the side wall of the mixing chamber 13, thereby driving the material spreading pipe 122 to reciprocate up and down while rotating, and uniformly spreading the paraffin particles in the mixing chamber 13. Moreover, the obliquely downwardly arranged material spreading pipe 122 can only spread the paraffin in the middle and lower parts of the mixing chamber 13, avoiding spreading the paraffin particles in the upper part of the mixing chamber 13, and further avoiding the material near the top plate 131 of the mixing chamber 13 being adhered to the top plate 131 by the paraffin particles when the material in the mixing chamber 13 is under pressure.

[0054] As another embodiment further provided by the present invention, a plurality of second guide grooves 142 that are sequentially connected and used to guide the movement of the material spreading pipe 122 are opened on the inner wall of the mixing chamber 13.

[0055] Specifically, the second guide grooves 142 are composed of a plurality of sequentially connected V-shaped grooves, and a guide block 125 adapted to the second guide grooves 142 is arranged on the material spreading pipe 122.

[0056] Further, during the rotation of the connecting pipe 12 and the material spreading pipe 122 with the material conveying pipe 11, the guide block 125 moves in the second guide grooves 142, and the second guide grooves 142 guide the guide block 125 to reciprocate up and down along the plurality of V-shaped grooves, thereby driving the connecting pipe 12 and the material spreading pipe 122 to rotate and move up and down at the same time, so that the paraffin particles spilled by the material spreading pipe 122 in the mixing chamber 13 are on a plurality of sequentially connected and oppositely directed spiral surfaces, thereby enabling the paraffin particles to be fully mixed with the powder material.

[0057] As another embodiment further provided by the present invention, an impeller 124 for pushing materials is arranged inside the material spreading pipe 122, and the material spreading pipe 122 moves along the second guide groove 142 to make the impeller 124 rotate.

[0058] Specifically, a first gear 126 is rotatably arranged on the guide block 125. The shaft rod of the first gear 126 extends into the interior of the material spreading pipe 122 and is rotatably provided with a second gear 127 meshing with the teeth on the impeller 124. A rack meshing with the first gear 126 is arranged in the second guide groove 142. A discharge port is formed on the side wall of the material spreading pipe 122. A self-elastic telescopic rod (this is prior art and will not be elaborated) is arranged at the bottom of the connecting pipe 12. A pushing plate 128 for stirring the materials in the mixing chamber 13 is arranged at the bottom of the self-elastic telescopic rod. A pressure relief valve 129 communicating with the internal space of the connecting pipe 12 and only allowing air to pass through is arranged at the bottom of the connecting pipe 12.

[0059] Further, the impeller 124 is inside the inner cavity of the material spreading pipe 122 and divides it into multiple chambers for storing paraffin wax particles. And in the connecting pipe 12, during the rotation of the connecting pipe 12, the guide block 125 moves along the second guide groove 142, and the first gear 126 is pushed by the rack in the second guide groove 142 to rotate. The first gear 126 drives the impeller 124 to rotate through the second gear 127. The impeller 124 pushes the paraffin wax particles in the material spreading pipe 122 towards the discharge port. The paraffin wax particles fall outside the material spreading pipe 122 under the action of gravity and are mixed with the materials in the mixing chamber 13. And the pushing plate 128 rotates with the connecting pipe 12 to stir the materials in the mixing chamber 13 to be fully mixed. During the process of the bottom plate 134 moving towards the top plate 131, the materials and air in the mixing chamber 13 are squeezed. At this time, the air in the storage chamber can be discharged into the connecting pipe 12 through the pressure relief valve 129, avoiding excessive air pressure inside the mixing chamber 13 from hindering the movement of the bottom plate 134 towards the top plate 131. The airflow discharged by the pressure relief valve 129 can also push the materials in the connecting pipe 12, avoiding the bridging effect of the materials in the connecting pipe 12 and affecting the falling of the materials.

[0060] As another embodiment further provided by the present invention, a baffle 123 for blocking the discharge port on the material spreading pipe 122 and facing the opposite direction of the rotation direction of the material spreading pipe 122 is arranged.

[0061] Specifically, the baffle 123 completely shields the discharge port. During the movement of the material spreading pipe 122, the baffle 123 moves synchronously with the material spreading pipe 122, and a temporary cavity is formed outside the material spreading pipe 122. The impeller 124 can push some paraffin wax particles in the material spreading pipe 122 from the discharge port to the outside of the material spreading pipe 122. As the material spreading pipe 122 continues to move, the paraffin wax particles outside the material spreading pipe 122 staying in place will be surrounded by the powder materials in the mixing chamber 13 and then mixed with the powder materials.

[0062] As another embodiment further provided by the present invention, a mounting frame 133 for supporting the bottom plate 134 is slidably disposed inside the rotating drum 1, and the feed pipe 11 rotates to make the mounting frame 133 reciprocate up and down.

[0063] Specifically, a slider 116 is slidably provided inside the rotating drum 1, a first cable 117 is provided between the slider 116 and the mounting frame 133, a turntable 115 meshing with the transmission wheel 114 is rotatably provided inside the rotating drum 1, a first guide groove 141 for guiding the movement of the first cable 117 is provided on the turntable 115, a spring is provided between the mounting frame 133 and the rotating drum 1, and when the mounting frame 133 is at the lowest point, the spring is in an initial state.

[0064] Furthermore, during the rotation of the feed pipe 11, the feed pipe 11 drives the turntable 115 to rotate through the transmission wheel 114, and the first guide groove 141 on the turntable 115 pushes the slider 116 to move toward the center of the turntable 115. The slider 116 drives the mounting frame 133 and the bottom plate 134 to move upward through the first cable 117, and the spring between the mounting frame 133 and the middle rotating drum 1 is stretched to accumulate elastic potential energy.

[0065] As another embodiment further provided by the present invention, the bottom plate 134 is composed of a plurality of sector-shaped blocks, and the bottom of the mixing chamber 13 is provided with a first guide slope 138 and a second guide slope 139 for guiding the plurality of sector-shaped blocks to move closer together.

[0066] Specifically, the fan-shaped block is provided with a tenon block (such as Figure 2 and 4 As shown), a tenon groove adapted to the tenon block is provided on the mounting frame 133, a spring is provided between the tenon block and the mounting frame 133, and a rubber layer is provided on the side wall adjacent to the fan-shaped block.

[0067] Furthermore, when the mounting frame 133 is at the lowest point, the fan-shaped blocks move away from each other under the action of the spring. At this time, the bottom plate 134 is dispersed, and the bottom of the mixing chamber 13 is in an open state. During the upward movement of the mounting frame 133, the fan-shaped blocks are pushed by the second guide slope 139 and gradually move together. When the fan-shaped blocks move to the connection between the second guide slope 139 and the first guide slope 138, multiple fan-shaped blocks come together to form the bottom plate 134 to seal the bottom of the mixing chamber 13. The mounting frame 133 continues to move upward with the fan-shaped blocks, and the fan-shaped blocks move along the first guide slope 138. The rubber layer between the fan-shaped blocks is squeezed, and the connection of the fan-shaped blocks is also tighter, so that the bottom plate 134 composed of multiple fan-shaped blocks has sufficient bearing capacity to avoid gaps in the bottom plate 134 when squeezing the material in the mixing chamber 13.

[0068] As yet another embodiment further provided by the present invention, a channel for powder to pass through is formed in the top plate 131, and the mounting bracket 133 moves to the connection point of the first guiding slope 138 and the second guiding slope 139 to open the channel.

[0069] Specifically, a sealing ring 132 for closing the channel on the top plate 131 is rotatably arranged on the top plate 131. A plurality of through holes adapted to the channel on the top plate 131 are formed in the sealing ring 132. A push rod 135 is arranged on the mounting bracket 133. An active block 136 for pulling the sealing ring 132 to rotate is slidably arranged inside the transfer cylinder 1. A cable is arranged between the active block 136 and the sealing ring 132. A torsion spring is arranged between the sealing ring 132 and the top plate 131. A material deflecting plate 113 closely attached to the top surface of the top plate 131 is arranged on the material conveying pipe 11. The second guiding groove 142 includes an inner ring 143 and an outer ring 144. A first inclined groove 145 is formed at the first end of the inner ring 143. A second inclined groove 146 is formed at the first end of the outer ring 144. The first inclined groove 145 is connected to the second inclined groove 146. A third inclined groove 147 is arranged between the second end of the outer ring 144 and the second end of the inner ring 143. The arc of the disk corresponding to the second inclined groove 146 is smaller. The arc of the disk corresponding to the first inclined groove 145 is larger. The arc corresponding to the third inclined groove 147 is also smaller.

[0070] Furthermore, when the mounting frame 133 is at the lowest point, the slider 116 is in the outer ring 144 of the second guide groove 142, the turntable 115 rotates, and the slider 116 gradually moves from the outer ring 144 to the second inclined groove 146, and the arc corresponding to the second inclined groove 146 is smaller. The second inclined groove 146 will push the slider 116 to move closer to the center of the disk at a faster speed, and then the mounting frame 133 is pulled upward by the first cable 117. The fan-shaped blocks on the mounting frame 133 move along the second guide slope 139 and gradually move closer. When the slider 116 6 moves to the connection between the second chute 146 and the first chute 145, the fan-shaped block moves to the connection between the second guide slope 139 and the first guide slope 138, and the plurality of fan-shaped blocks are brought together to form the bottom plate 134 to seal the bottom of the mixing chamber 13, and the push rod 135 contacts the movable block 136, and the push rod 135 pushes the movable block 136 to move upward, and the movable block 136 drives the sealing ring 132 to rotate through the second cable 137, and the notch on the sealing ring 132 gradually faces the channel on the top plate 131, and at this time, the powder material above the top plate 131 can be The powder material enters the mixing chamber 13 through the passage, and the feeding pipe 11 pushes the powder material through the material-diverting plate 113, accelerating the powder material to enter the mixing chamber 13, and the mounting frame 133 continues to move upward, and the slider 116 moves along the first inclined groove 145 to the center of the rotating disk 115 at a slower speed, and the fan-shaped block moves along the first guide slope 138 and continues to move closer, and the movable block 136 continues to pull the sealing ring 132 to rotate, and the notch on the sealing ring 132 is staggered with the passage on the top plate 131, and the bottom plate 134 moves closer to the top plate 131 to squeeze the material in the mixing chamber 13. , until the slider 116 enters the inner ring 143 and the mounting bracket 133 moves to the highest point; the turntable 115 continues to rotate, the slider 116 quickly returns to the outer ring 144 along the third inclined groove 147, and the mounting bracket 133 quickly moves downward under the action of the spring to quickly reset the sealing ring 132 to prevent excessive material from falling from the top plate 131 into the mixing chamber 13, and the fan-shaped blocks are dispersed under the action of the spring, and the material in the mixing chamber 13 falls into the extruder, which is extruded into particles by the extruder to produce antibacterial masterbatch, which is convenient for subsequent spinning work.

[0071] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a wear-resistant and antibacterial polylactic acid composite fiber, characterized in that: The invention comprises a rotating cylinder (1), a material conveying pipe (11) is rotatably arranged on the rotating cylinder (1), a mixing chamber (13) is arranged at the bottom of the rotating cylinder (1), the upper and lower ends of which are respectively closed by a top plate (131) and a bottom plate (134), a first spiral blade (111) whose side is closely attached to the inner wall of the rotating cylinder (1) and spirals downward is arranged in the middle of the material conveying pipe (11), and a second spiral blade (112) is located on the first spiral blade (111) and spirals in the opposite direction, and a material spreading pipe (122) extending into the mixing chamber (13) is movably arranged at the bottom of the material conveying pipe (11), and the invention also comprises the following steps: S1, the mixed antibacterial powder and polylactic acid are put into the rotating drum (1), and paraffin is put into the feeding pipe (11), and the feeding pipe (11) drives the first spiral blade (111) and the second spiral blade (112) to rotate, collect the mixed powder, and prevent the powder from overflowing; S2, the mixed powder passes through the top plate (131) and enters the mixing chamber (13), and the spreading pipe (122) rotates with the conveying pipe (11) and scatters the paraffin particles; S3, the bottom plate (134) moves closer to the top plate (131) to squeeze the mixed powder and paraffin, so that the powder and paraffin are tightly combined; S4. The bottom plate (134) is opened to feed the fully mixed materials in the mixing chamber (13) into the extruder.

2. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that: The number of spiral turns of the first spiral blade (111) is greater than 2.

3. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that: The number of spiral turns of the second spiral blade (112) is 0.

5.

4. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that: The material spreading pipe (122) is coupled to the side wall of the material mixing chamber (13) so that it rotates with the material conveying pipe (11) and moves up and down reciprocatingly.

5. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that: A plurality of second guide grooves (142) which are connected in sequence and are used to guide the movement of the material spreading pipe (122) are provided on the inner wall of the material mixing chamber (13).

6. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 5, characterized in that: An impeller (124) for pushing materials is arranged inside the material spreading pipe (122), and the material spreading pipe (122) moves along the second guide groove (142) to rotate the impeller (124).

7. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that: The material spreading pipe (122) is provided with a blocking piece (123) for covering the material outlet thereon and facing in the opposite direction of the rotation direction of the material spreading pipe (122).

8. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that: A mounting frame (133) for supporting the bottom plate (134) is slidably disposed inside the rotating cylinder (1), and the feed pipe (11) rotates to allow the mounting frame (133) to reciprocate up and down.

9. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 8, characterized in that: The bottom plate (134) is composed of a plurality of sector-shaped blocks, and the bottom of the mixing chamber (13) is provided with a first guide slope (138) and a second guide slope (139) for guiding the plurality of sector-shaped blocks to move closer together.

10. The method for preparing the wear-resistant and antibacterial polylactic acid composite fiber according to claim 9, characterized in that: The top plate (131) is provided with a passage for powder to pass through, and the mounting frame (133) moves to the connection point between the first guide slope (138) and the second guide slope (139) to open the passage.

Images