Preparation method of artemisia fiber and water-repellent viscose fiber bicomponent nonwoven fabric

Abstract

The application discloses a preparation method of a wormwood fiber water-repellent viscose fiber bicomponent non-woven fabric, and comprises the following steps: mixing and cutting, primary negative pressure distillation, mixing and stirring, secondary negative pressure distillation, high-temperature extrusion, cooling and forming, and cross-laying, so as to prepare the bicomponent fiber through NMMO solution, and the material is derived from plants, effectively solving the shortage of fiber raw materials and being more environmentally-friendly; the pulp is distributed with a large number of breathable holes through foaming treatment, and a porous structure is formed in the fiber, compared with single fiber or mixed carded non-woven fabric, the non-woven fabric has multiple functions, that is, soft and breathable, wear-resistant and skin-friendly, fast absorption and dry, and also has a bacteriostatic effect, and the non-woven fabric is more evenly carded into a web and is more stable in performance.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabrics, specifically to a method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber. Background Technology

[0002] With increasing environmental awareness, the market demand for green and biodegradable materials is growing. Artemisia argyi, a traditional Chinese medicine, possesses excellent antibacterial and anti-inflammatory properties and has been applied in various products. Non-woven fabric, as a new type of textile material, is widely used in medical, hygiene, and home furnishing fields due to its low production cost, simple processing, and high design flexibility. However, traditional non-woven fabrics mostly use chemically synthesized fibers, resulting in poor environmental performance. Therefore, developing a new material that combines the properties of Artemisia argyi with the advantages of non-woven fabric is of great significance. Existing bicomponent fiber preparation methods can employ composite spinning to produce parallel, core-sheath, and multi-core composite fibers; or blend spinning to produce island-of-the-sea composite fibers. Utilizing the different properties of the two polymer components, three-dimensional permanently crimped fibers, thermally bonded fibers (such as ES fibers), and conductive fibers can be produced. In other words, existing bicomponent preparation technologies use PBT and PET components with different properties, which are melted separately. The PBT melt and PET melt are extruded together at the micro-orifice of a spinneret to form monofilament bundles, which are then stretched, cooled, cured, wound, and stretched. However, this method suffers from unstable proportions of the parallel components during production, resulting in low production efficiency and poor quality. Therefore, a method for preparing a bicomponent nonwoven fabric using Artemisia argyi fiber and water-repellent viscose fiber is needed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art and provide a method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: S1, Mixed chips: Artemisia argyi cellulose pulp with an average degree of polymerization of 300-600 and viscose core cellulose pulp are mixed and sliced ​​at an Artemisia argyi fiber: viscose fiber mass ratio of 1:1-9:1 for later use; S2, a single negative pressure distillation, distills the NMMO solution under negative pressure to maintain a water content of 20-30%; S3, pre-dispersed, the NMMO solution is added to the tank of the mixing device (1), and then the sliced ​​mixed fibers, crosslinking agent and foaming agent are dispersed and added to the NMMO solution; S4, mix and stir evenly, then heat to 80℃-110℃ through a mixing device, and process with an ultrasonic stirrer and stirring mechanism for 10min-30min to obtain a spinning mixture; S5, Secondary negative pressure distillation: The spinning mixture is distilled under negative pressure to remove excess water, maintaining the water content of the NMMO solution at 10%-15%, to obtain the spinning mixture stock solution. S6, high-temperature extrusion, the spinning mixture is extruded from the spinneret to form a melt stream; S7, Initial slow cooling: The molten stream is initially cooled by a primary cooling device; S8, Cooling and molding: The gradually cooled melt stream is introduced into a dilute NMMO aqueous solution for molding, and then after post-processing steps such as washing, cutting, oiling, and drying, the Artemisia argyi fiber viscose fiber bicomponent composite fiber is obtained. S9, cross-laying: The bicomponent composite fibers of Artemisia argyi and viscose are opened, mixed, and then carded in carding machine 1 and laid in cross-laying machine 1; then the Artemisia argyi and composite bicomponent fibers are opened and carded in carding machine 2, and then laid in cross-laying machine 2; the materials are stacked on top of each other in the laying machine; and then hydroentangled on both sides to obtain the bicomponent hydroentangled nonwoven fabric of Artemisia argyi and viscose.

[0005] This invention uses Artemisia argyi cellulose pulp and viscose core fiber pulp as raw materials. These are dissolved in an NMMO solution, and then a complexing crosslinking agent and a foaming agent are added. After ultrasonic treatment, a spinning mixture is obtained. The spinning mixture is extruded at high temperature and cooled to produce bicomponent plant fibers. The fibers are then slit according to the requirements of spunlace fabric processing and fed into a carding machine for cross-laying. Both sides are reinforced with hydroentangling to obtain a bicomponent nonwoven fabric. This invention patent uses NMMO solution to produce bicomponent fibers, with materials derived from plants, effectively solving the shortage of fiber raw materials and making it more environmentally friendly. The foaming treatment of the pulp creates numerous breathable pores, forming a porous structure inside the fibers. Compared with nonwoven fabrics made from single fibers or mixed carding, it possesses multiple functions: soft and breathable, wear-resistant and skin-friendly, quick-absorbing and dry, and also has antibacterial properties. Furthermore, the nonwoven fabric is carded into a more uniform web, resulting in more stable performance.

[0006] This invention performs preliminary slow cooling before entering the dilute NMMO aqueous solution, allowing the melt stream to cool down slowly, preventing the filament from cooling too rapidly and reducing the product's elongation at break (CV).

[0007] The crosslinking agent is used at a rate of 0.05%-0.5% of the mass of the mixed fiber chips, and the foaming agent is used at a rate of 0.1%-0.8% of the mass of the mixed fiber chips. The complexing crosslinking agent is at least two of the following: gluconic acid, diethylenetriaminepentaacetic acid, sodium pyrophosphate, diethylenetriaminepentamethylenephosphonic acid, and aminotrimethylenephosphonic acid. The foaming agent is a polymer hollow microsphere coated with nano-calcium carbonate on an acrylic resin surface.

[0008] Excessive use of foaming agent will result in numerous voids within the fibers, making them prone to breakage and difficult to form into fabric; insufficient use of foaming agent will result in fewer voids within the fibers, failing to create a significant siphon effect and affecting the dryness of the final product. Excessive use of complexing and crosslinking agent will cause over-crosslinking, resulting in high fiber stiffness and poor softness after fabrication; excessive use of complexing and crosslinking agent will also cause poor bicomponent fiber forming and reduce the yield.

[0009] The viscosity of the spinning mixture is 1000-1500 Pa·s; the concentration of the dilute NMMO aqueous solution is 10%-20%.

[0010] Preferably, the mixing device includes a tank, an ultrasonic stirrer, a revolution-rotation stirring mechanism, a pre-dispersing material mechanism, and a first electric push rod. The top of the tank is provided with a feed inlet, the revolution-rotation stirring mechanism is located at the bottom of the tank, the pre-dispersing material mechanism is located above the revolution-rotation stirring mechanism, the first electric push rod is located at the top of the tank, and the ultrasonic stirrer is located at the push rod end of the first electric push rod.

[0011] This invention pre-disperses Artemisia argyi cellulose pulp and viscose core cellulose pulp, complexing crosslinking agent and foaming agent into NMMO solution through a pre-dispersing material mechanism, ensuring uniform dispersion and improving stirring efficiency. Then, an ultrasonic stirrer is used in conjunction with a revolution and rotation stirring mechanism for stirring. The combination of revolution and rotation allows the stirrer to form a more complex flow pattern in the liquid, thereby improving the mixing uniformity of the materials, reducing fuzz, and overcoming the problem of local heating and excessively high local temperature caused by using only an ultrasonic stirrer. It also reduces the cavitation phenomenon that occurs when using only an ultrasonic stirrer.

[0012] Preferably, the pre-dispersed material mechanism includes a hollow first rotating tube, a second electric push rod, a rotating gear, a semi-circular dispersing plate, a scraper, and a rack. The second electric push rod is located inside the first rotating tube, and two racks are positioned opposite each other at the push rod ends of the second electric push rod. The rotating gear meshes with the racks. A connecting rod is provided in the middle of the rotating gear. The middle of the semi-circular dispersing plate has an installation space for placing the rotating gear. The connecting rod is located within the installation space. A first bearing is fixed to the side wall of the connecting rod, and the outer ring of the first bearing is fixed to the side wall of the first rotating tube. The scraper is located above the two semi-circular dispersing plates and is fixed to the side wall of the tank. A third electric push rod is located at the top of the first rotating tube, and a rotary motor is connected to the motor end of the third electric push rod. The rotary motor is fixed to the tank.

[0013] This invention delivers material to a semi-circular dispersing plate through a feed inlet. A rotary motor then rotates the plate, causing it to spread the material evenly on the plate via a scraper. A third electric actuator then moves the plate below the surface of the NMMO solution. A second electric actuator moves upward, causing a rack to drive a rotating gear, which in turn rotates the semi-circular dispersing plate downwards by 90 degrees. Finally, the third electric actuator moves the downward-rotated plate away from the liquid surface, thus completing the material dispersion and improving stirring efficiency.

[0014] Preferably, the revolution-rotation stirring mechanism includes a hollow second rotating tube, a driving bevel gear, a driven bevel gear, a third bearing, a stirring paddle, a fixed tube, and a second bearing. The second rotating tube is located below the first rotating tube, and the fixed tube is fixed inside the second rotating tube. The two driving bevel gears are evenly distributed on the side wall of the fixed tube, and each driving bevel gear meshes with two driven bevel gears. The stirring paddle is fixed to the side wall of the second rotating tube by the second bearing. The third bearing is located at the bottom of the second rotating tube, and a bracket is fixed to the outer ring of the third bearing. The bracket is fixed to the bottom of the tank.

[0015] This invention utilizes the rotation of the first rotating tube to drive the rotation of the active bevel gear, which in turn drives the rotation of the passive bevel gear. This allows the stirring paddle to revolve around the central axis while simultaneously rotating on its own axis. This combined revolution and rotation enhances the shear force of the fluid, enabling better flow and mixing during the stirring process, thereby improving production efficiency and saving time and costs.

[0016] Preferably, the bottom of the first rotating tube is provided with a telescopic tube, the telescopic tube including an outer tube and an inner tube sleeved inside the outer tube, the outer tube being fixedly connected to the second rotating tube, the inner tube being fixedly connected to the first rotating tube, the inner sidewall of the outer tube having a limiting groove along the axial direction, the inner tube having a locking block that cooperates with the limiting groove, the telescopic tube having a drive rod inside, one end of the drive rod being fixedly connected to the bottom of the first rotating tube, the inner sidewall of the fixed tube being fixed with an internal gear ring, and the end of the drive rod having a drive gear that cooperates with the internal gear ring.

[0017] Preferably, the present invention enables the third electric push rod to carry the dispersion plate into the interior of the liquid through the cooperation of the inner tube and the outer tube. The cooperation of the limiting groove and the locking block, as well as the cooperation of the internal gear ring and the drive gear on the drive rod, enables the rotary motor to drive the revolution and rotation stirring mechanism to stir.

[0018] Preferably, the preliminary cooling device includes a plurality of heat-conducting coils, the top end of which is connected to a liquid inlet manifold, and the bottom end of which is connected to a collection manifold. Heat-conducting liquid can be added to the liquid inlet manifold for heat conduction.

[0019] This invention places the heat-conducting coil below the spinneret, ensuring that the molten fine stream can flow through the heat-conducting coil. The heat-conducting coil radiates heat to the molten fine stream, causing the molten fine stream to cool down slowly, preventing the filament from cooling too quickly and prematurely, reducing the non-uniformity of the filament section, and reducing the elongation at break (CV) value of the product.

[0020] Preferably, a flow equalization structure is provided at the connection between the liquid inlet manifold and the heat-conducting coil. The flow equalization structure includes a fixing block, a compression spring, a hemispherical plug, and a water inlet plate. The fixing block is fixed inside the starting end of the heat-conducting coil. A through groove communicating with the inside of the heat-conducting coil is opened on the fixing block. The hemispherical plug is inserted in the through groove. The water inlet plate is fixedly connected to the side wall of the heat-conducting coil. The compression spring is located between the hemispherical plug and the water inlet plate. The water inlet plate has three or more liquid guiding holes. The compression spring exerts a greater force on the plug as it gets closer to the liquid inlet of the liquid inlet manifold.

[0021] This invention controls the position of the hemispherical plug core within the conductive groove by compressing the spring and tightening it. This, in turn, controls the amount of heat transfer fluid passing through each heat transfer coil. The spring force of each uniform flow structure is different, ensuring that each heat transfer coil receives a portion of the heat transfer fluid. This uniform distribution of the heat transfer fluid prevents inconsistencies in the thermal conductivity of each coil, thus avoiding uneven product quality.

[0022] Preferably, the outer side of the tank is provided with a heating coil, and the heating coil is further provided with an insulation layer.

[0023] The fiber in this invention has two components, and its absorption rate is lower than that of ordinary bamboo fiber, thus improving its dryness. Using a foaming process, the foaming agent foams the fibers at high temperature to form a porous structure, which accelerates the absorption rate of the fibers and makes the non-woven fabric with good breathability, thus improving the user experience. Ultrasonic-assisted treatment can increase the cellulose content of the spinning solution and ensure that the two types of cellulose can be mixed evenly. Compared with traditional plant fiber blending and combing processes, the fiber web laid out in this invention is more uniform and its performance is more stable.

[0024] In summary, the beneficial effects of this invention are as follows: 1. This invention uses Artemisia argyi cellulose pulp and viscose core fiber pulp as raw materials. These are dissolved in an NMMO solution, and then a complexing crosslinking agent and a foaming agent are added. The mixture is then treated with ultrasound to obtain a spinning mixture. This spinning mixture is extruded at high temperature and cooled to produce bicomponent plant fibers. The fibers are then slit according to the requirements of spunlace fabric processing and fed into a carding machine for cross-laying. Both sides are reinforced with hydroentanglement to obtain a bicomponent nonwoven fabric. This invention patent uses NMMO solution to produce bicomponent fibers, with materials derived from plants, effectively solving the shortage of fiber raw materials and making it more environmentally friendly. The foaming treatment of the pulp creates numerous breathable pores, forming a porous structure inside the fibers. Compared with nonwoven fabrics made from single fibers or mixed carding, it possesses multiple functions: soft and breathable, wear-resistant and skin-friendly, quick-absorbing and dry, and also has antibacterial properties. Furthermore, the nonwoven fabric is carded into a more uniform web, resulting in more stable performance. 2. In this invention, the filament is first subjected to preliminary slow cooling before entering the dilute aqueous solution of NMMO, so that the melt stream cools down slowly, preventing the filament from cooling too quickly and prematurely, thus reducing the elongation at break (CV) value of the product. 3. This invention pre-disperses Artemisia argyi cellulose pulp and viscose core cellulose pulp, complexing crosslinking agent and foaming agent into NMMO solution through a pre-dispersing material mechanism, ensuring uniform dispersion and improving stirring efficiency. Then, an ultrasonic stirrer is used in conjunction with a revolution and rotation stirring mechanism for stirring. The combination of revolution and rotation allows the stirrer to form a more complex flow pattern in the liquid, thereby improving the mixing uniformity of the material, reducing fuzz, and overcoming the problem of local heating and excessively high local temperature caused by using only an ultrasonic stirrer. It can also reduce the cavitation phenomenon that occurs when using only an ultrasonic stirrer. 4. In this invention, the material is conveyed to the semi-circular dispersion plate through the feed inlet. Then, the semi-circular dispersion plate is rotated by a rotary motor, thereby spreading the material on the semi-circular dispersion plate evenly by a scraper. Then, the semi-circular dispersion plate is conveyed to the surface of the NMMO solution by a third electric push rod. Then, the second electric push rod moves upward, causing the rack to drive the rotary gear to rotate, causing the semi-circular dispersion plate to rotate downward by 90 degrees. Then, the third electric push rod drives the downward rotated semi-circular dispersion plate to leave the liquid surface, thereby completing the dispersion of the material and improving the stirring efficiency. 5. This invention places the heat-conducting coil below the spinneret, ensuring that the molten fine stream can flow through the heat-conducting coil. The heat-conducting coil radiates heat to the molten fine stream, causing the molten fine stream to cool down slowly, preventing the filament from cooling too quickly and prematurely, reducing the non-uniformity of the filament section, and reducing the elongation at break (CV) value of the product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the semi-circular dispersing plate of the mixing device of the present invention flipping downwards; Figure 2This is a schematic diagram of the semi-circular dispersing plate of the mixing device of the present invention laid flat; Figure 3 This is a schematic diagram of the semi-circular dispersion plate and the revolution-rotation stirring mechanism of the present invention. Figure 4 This is a schematic diagram of the rack and rotating gear of the present invention; Figure 5 This is a top view schematic diagram of the pre-dispersed material mechanism of the present invention; Figure 6 This is the present invention. Figure 5 An enlarged view of point A; Figure 7 This is a cross-sectional schematic diagram of the revolution and rotation stirring mechanism of the present invention; Figure 8 This is a three-dimensional schematic diagram of the revolution and rotation stirring mechanism of the present invention; Figure 9 This is a top sectional view of the outer tube and inner tube of the telescopic tube of the present invention; Figure 10 This is the present invention. Figure 7 An enlarged view of point B; Figure 11 This is a schematic diagram of the preliminary cooling device of the present invention; Figure 12 This is a cross-sectional schematic diagram of the uniform flow structure of the present invention; Figure 13 This is a cross-sectional schematic diagram showing the hemispherical plug core of the uniform flow structure of the present invention being lifted up. Detailed Implementation

[0026] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. Those skilled in the art can make modifications to these embodiments without contributing any inventive step after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Example

[0029] A method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber includes the following steps: S1, Mixed chips: Artemisia argyi cellulose pulp with an average degree of polymerization of 300-600 and viscose core cellulose pulp are mixed and sliced ​​at an Artemisia argyi fiber: viscose fiber mass ratio of 1:1-9:1 for later use; S2, a single negative pressure distillation, distills the NMMO solution under negative pressure to maintain a water content of 20-30%; S3, pre-dispersion: NMMO solution is added to the tank of mixing device 1, and then the sliced ​​mixed fibers, crosslinking agent and foaming agent are dispersed and added to the NMMO solution; S4, mix and stir evenly, then heat to 80℃-110℃ through mixing device 1, and process with ultrasonic stirrer and stirring mechanism for 10min-30min to obtain spinning mixture; S5, Secondary negative pressure distillation: The spinning mixture is distilled under negative pressure to remove excess water, maintaining the water content of the NMMO solution at 10%-15%, to obtain the spinning mixture stock solution. S6, high-temperature extrusion, the spinning mixture is extruded from the spinneret to form a melt stream; S7, Initial slow cooling, the melt stream is initially cooled by the initial cooling device 2; S8, Cooling and molding: The gradually cooled melt stream is introduced into a dilute NMMO aqueous solution for molding, and then after post-processing steps such as washing, cutting, oiling, and drying, the Artemisia argyi fiber viscose fiber bicomponent composite fiber is obtained. S9, cross-laying: The bicomponent composite fibers of Artemisia argyi and viscose are opened, mixed, and then carded in carding machine 1 and laid in cross-laying machine 1; then the Artemisia argyi and composite bicomponent fibers are opened and carded in carding machine 2, and then laid in cross-laying machine 2; the materials are stacked on top of each other in the laying machine; and then hydroentangled on both sides to obtain the bicomponent hydroentangled nonwoven fabric of Artemisia argyi and viscose.

[0030] The crosslinking agent is used at a rate of 0.05%-0.5% of the mass of the mixed fiber chips, and the foaming agent is used at a rate of 0.1%-0.8% of the mass of the mixed fiber chips. The complexing crosslinking agent is at least two of the following: gluconic acid, diethylenetriaminepentaacetic acid, sodium pyrophosphate, diethylenetriaminepentamethylenephosphonic acid, and aminotrimethylenephosphonic acid. The foaming agent is a polymer hollow microsphere coated with nano-calcium carbonate on an acrylic resin surface.

[0031] The viscosity of the spinning mixture is 1000-1500 Pa·s; the concentration of the dilute NMMO aqueous solution is 10%-20%.

[0032] like Figure 1 As shown, the mixing device 1 includes a tank 11, an ultrasonic stirrer 12, a revolution and rotation stirring mechanism 13, a pre-dispersing material mechanism 14, and a first electric push rod 15. The revolution and rotation stirring mechanism 13 is located at the bottom of the tank 11, the pre-dispersing material mechanism 14 is located above the revolution and rotation stirring mechanism 13, the first electric push rod 15 is located at the top of the tank 11, the ultrasonic stirrer 12 is located at the push rod end of the first electric push rod 15, a heating coil 110 is provided on the outside of the tank 11, and an insulation layer 111 is provided outside the heating coil 110.

[0033] like Figure 1-2 As shown, the pre-dispersed material mechanism 14 includes a hollow first rotating tube 141, a second electric push rod 142, a rotating gear 143, a semi-circular dispersing plate 144, a scraper 145, and a rack 146. The second electric push rod 142 is located inside the first rotating tube 141. Two racks are positioned opposite each other, and the racks 146 are located at the push rod ends of the second electric push rod 142. The rotating gear 143 meshes with the racks 146. A connecting rod 148 is provided in the middle of the rotating gear 143, and the semi-circular dispersing plate 144 has a central section for placing the rotating gear 143. The installation space 147 is provided, the connecting rod 148 is provided in the installation space 147, the first bearing 149 is fixed on the side wall of the connecting rod 148, the outer ring of the first bearing 149 is fixed on the side wall of the first rotating tube 141, the scraper 145 is provided above the two semi-circular dispersing plates 144, the scraper 145 is fixed on the side wall of the tank body 11, the top of the first rotating tube 141 is provided with a third electric push rod 150, the motor end of the third electric push rod 150 is connected to a rotary motor 146, and the rotary motor 146 is fixed on the tank body 11.

[0034] like Figure 7-8 As shown, the revolution-rotation stirring mechanism 13 includes a hollow second rotating tube 131, a driving bevel gear 132, a driven bevel gear 133, a third bearing 134, a stirring paddle 135, a fixed tube 136, and a second bearing 137. The second rotating tube 131 is located below the first rotating tube 141, and the fixed tube 136 is fixed inside the second rotating tube 131. The two driving bevel gears 132 are evenly distributed on the side wall of the fixed tube 136, and each driving bevel gear 132 meshes with two driven bevel gears. 133, the stirring paddle 135 is fixed on the side wall of the second rotating tube 131 by the second bearing 137, the third bearing 134 is located at the bottom of the second rotating tube 131, the outer ring of the third bearing 134 is fixed with a bracket 138, the bracket 138 is fixed at the bottom of the tank 11, the stirring paddle is provided with staggered hemispherical grooves, the hemispherical grooves generate three-dimensional flow and are subjected to the combined effects of shearing, peeling, matching and kneading, so that the material is further fully mixed and further reduces fuzz.

[0035] like Figure 9As shown, the bottom of the first rotating tube 141 is provided with a telescopic tube 16. The telescopic tube includes an outer tube 161 and an inner tube 162 sleeved inside the outer tube 161. The outer tube 161 is fixedly connected to the second rotating tube 131, and the inner tube 162 is fixedly connected to the first rotating tube 141. A limiting groove 164 is formed on the inner sidewall of the outer tube 161 along the axial direction. A locking block 163 that cooperates with the limiting groove 163 is provided on the inner tube 162. A driving rod 164 is provided inside the telescopic tube 16. One end of the driving rod 164 is fixedly connected to the bottom of the first rotating tube 141. An internal gear ring 166 is fixed on the inner sidewall of the fixed tube 136. A driving gear 167 that cooperates with the internal gear ring 166 is provided at the end of the driving rod 164.

[0036] like Figure 11 As shown, the preliminary cooling device 2 includes several heat-conducting coils 21, with a liquid inlet manifold 22 connected to the top of each heat-conducting coil and a collection pipe 23 connected to the bottom of each heat-conducting coil.

[0037] like Figure 12-13 As shown, a flow equalization structure 24 is provided at the connection between the liquid inlet manifold 22 and the heat-conducting coil 21. The flow equalization structure 24 includes a fixing block 241, a compression spring 242, a hemispherical plug core 243, and a water inlet plate 244. The fixing block 241 is fixed inside the starting end of the heat-conducting coil 21. A through groove 245 communicating with the inside of the heat-conducting coil 21 is opened on the fixing block 241. The hemispherical plug core 243 is inserted in the through groove 245. The water inlet plate 244 is fixedly connected to the side wall of the heat-conducting coil 21. The compression spring 242 is located between the hemispherical plug core 243 and the water inlet plate 244. The water inlet plate 244 has three or more liquid guiding holes 246. The compression spring 242 exerts a greater force on the plug core 93 as it gets closer to the liquid inlet port of the liquid inlet manifold 22.

[0038] Working principle: such as Figure 1-11As shown, during mixing, NMMO solution is added to tank 11. Then, the mixture of Artemisia argyi cellulose pulp and viscose core cellulose pulp is conveyed through the inlet to the semi-circular dispersing plate 144. A rotary motor then slowly rotates the semi-circular dispersing plate 144, causing the scraper 145 to level the material. Next, a third electric push rod 150 drives the two semi-circular dispersing plates 144 to be below the surface of the NMMO solution. Then, a second electric push rod 142 moves upward, causing the rack 146 to drive the rotating gear 143 to rotate, causing the semi-circular dispersing plates to rotate downwards by 90 degrees. Finally, the third electric push rod 150 drives the downward-rotated semi-circular dispersing plates 144 away from the liquid surface, thus completing the material dispersion. In the solution, when the semicircular dispersion plate 144 returns to its original position, the second electric push rod 142 moves downward, causing the rack 146 to drive the rotating gear 143 to rotate, causing the semicircular dispersion plate to flip upward 90 degrees and return to its original position. Then, the complexing crosslinking agent and the foaming agent are also dispersed and added to the NMMO solution. After complete dispersion, the semicircular dispersion plate 144 can be kept in the downward flipped 90-degree state, so that the ultrasonic stirrer and the revolution and rotation stirring mechanism can be used for stirring. Then the ultrasonic stirrer works, and the rotary motor rotates at the same time, driving the downward flipped 90-degree semicircular dispersion plate and the revolution and rotation stirring mechanism to rotate, stirring the material to form a complex flow pattern, thereby improving the mixing uniformity of the material.

[0039] Test items for spunlace nonwoven fabric

Claims

1. A method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber, characterized in that, Includes the following steps: S1, Mixed chips: Artemisia argyi cellulose pulp and viscose core cellulose pulp with an average degree of polymerization of 300-600 are mixed and sliced ​​at an Artemisia argyi fiber: viscose fiber mass ratio of 1:1-9:1 for later use; S2, a single negative pressure distillation, distills the NMMO solution under negative pressure to maintain a water content of 20-30%; S3, pre-dispersed, the NMMO solution is added to the tank of the mixing device (1), and then the sliced ​​mixed fibers, crosslinking agent and foaming agent are dispersed and added to the NMMO solution; S4, mix and stir evenly, then heat to 80℃-110℃ through mixing device (1), and process with ultrasonic stirrer and stirring mechanism for 10min-30min to obtain spinning mixture; S5, Secondary negative pressure distillation: The spinning mixture is distilled under negative pressure to remove excess water, maintaining the water content of the NMMO solution at 10%-15%, to obtain the spinning mixture stock solution. S6, high-temperature extrusion, the spinning mixture is extruded from the spinneret to form a melt stream; S7, initial slow cooling, the melt stream is initially cooled by the initial cooling device (2); S8, Cooling and molding: The gradually cooled melt stream is introduced into a dilute NMMO aqueous solution for molding, and then washed, cut, oiled and dried to obtain the bicomponent composite fiber of Artemisia argyi fiber and viscose fiber. S9, cross-laying: The bicomponent composite fibers of Artemisia argyi and viscose are opened, mixed, and then carded in carding machine 1 and laid in cross-laying machine 1; then the Artemisia argyi and composite bicomponent fibers are opened and carded in carding machine 2, and then carded and laid in cross-laying machine 2; the materials are stacked on top of each other in the laying machine; and then hydroentangled on both sides to obtain the bicomponent hydroentangled nonwoven fabric of Artemisia argyi and viscose. The mixing device (1) includes a tank (11), an ultrasonic stirrer (12), a revolution and rotation stirring mechanism (13), a pre-dispersing material mechanism (14), and a first electric push rod (15). The revolution and rotation stirring mechanism (13) is located at the bottom of the tank (11), the pre-dispersing material mechanism (14) is located above the revolution and rotation stirring mechanism (13), the first electric push rod (15) is located at the top of the tank (11), and the ultrasonic stirrer (12) is located at the push rod end of the first electric push rod (15). The pre-dispersing material mechanism (14) includes a hollow first rotating tube (141), a second electric push rod (142), a rotating gear (143), a semi-circular dispersing plate (144), a scraper (145), and a rack (146). The second electric push rod (142) is located inside the first rotating tube (141). Two racks (146) are arranged opposite to each other at the push rod ends of the second electric push rod (142). The rotating gear (143) meshes with the racks (146). A connecting rod (148) is provided in the middle of the rotating gear (143). An installation space (147) is provided in the middle of the semi-circular dispersing plate (144) to facilitate the placement of the rotating gear (143). The connecting rod (148) is located in the installation space (147). A first bearing (149) is fixed on the side wall of the connecting rod (148). The outer ring of the first bearing (149) is fixed to the first rotating tube (141). On the side wall of the tube (141), the scraper (145) is located above the two semi-circular dispersion plates (144). The scraper (145) is fixed on the side wall of the tank (11). The top of the first rotating tube (141) is provided with a third electric push rod (150). The motor end of the third electric push rod (150) is connected to a rotary motor. The rotary motor is fixed on the tank (11). The material is conveyed to the semi-circular dispersion plate through the feed port. Then, the semi-circular dispersion plate is rotated by the rotary motor. The material on the semi-circular dispersion plate is spread flat by the scraper. Then, the semi-circular dispersion plate is conveyed to the liquid surface of the NMMO solution by the third electric push rod. Then, the second electric push rod moves upward, so that the rack drives the rotary gear to rotate, so that the semi-circular dispersion plate is flipped downward by 90 degrees. Then, the third electric push rod drives the downward flipped semi-circular dispersion plate to leave the liquid surface, thereby completing the dispersion of the material and improving the stirring efficiency. The revolution-rotation stirring mechanism (13) includes a hollow second rotating tube (131), a driving bevel gear (132), a driven bevel gear (133), a third bearing (134), a stirring paddle (135), a fixed tube (136), and a second bearing (137). The second rotating tube (131) is located below the first rotating tube (141), and the fixed tube (136) is fixed inside the second rotating tube (131). The two driving bevel gears (132) are evenly distributed on the side wall of the fixed tube (136), and each driving bevel gear (132) meshes with two... A passive bevel gear (133), the stirring paddle (135) is fixed on the side wall of the second rotating tube (131) by the second bearing (137), the third bearing (134) is located at the bottom of the second rotating tube (131), the outer ring of the third bearing (134) is fixed with a bracket (138), the bracket (138) is fixed at the bottom of the tank (11), the stirring paddle is provided with staggered hemispherical grooves, the hemispherical grooves generate three-dimensional flow and are subjected to shearing, peeling, matching and kneading effects, so that the material is further fully mixed and further reduces fuzz; The bottom of the first rotating tube (141) is provided with a telescopic tube (16), which includes an outer tube (161) and an inner tube (162) sleeved inside the outer tube (161). The outer tube (161) is fixedly connected to the second rotating tube (131), and the inner tube (162) is fixedly connected to the first rotating tube (141). The inner sidewall of the outer tube (161) is provided with a limiting groove (164) along the axial direction. The inner tube (162) is provided with a locking block (163) that cooperates with the limiting groove (164). The tube (16) is equipped with a drive rod. One end of the drive rod is fixedly connected to the bottom of the first rotating tube (141). An internal gear ring (166) is fixed on the inner side wall of the fixed tube (136). The end of the drive rod is equipped with a drive gear (167) that cooperates with the internal gear ring (166). Through the cooperation of the inner tube and the outer tube, the third electric push rod can carry the dispersion plate into the interior of the liquid. The cooperation between the limiting groove and the locking block, as well as the cooperation between the internal gear ring and the drive gear on the drive rod, enables the rotary motor to carry the revolution and rotation stirring mechanism to stir. The preliminary cooling device (2) includes several heat-conducting coils (21), the top of which is connected to a liquid inlet manifold (22), and the bottom of which is connected to a collection pipe (23). A flow equalization structure (24) is provided at the connection between the liquid inlet manifold (22) and the heat-conducting coil (21). The flow equalization structure (24) includes a fixing block (241), a compression spring (242), a hemispherical plug (243), and a water inlet plate (244). The fixing block (241) is fixed inside the starting end of the heat-conducting coil (21). A through groove (245) communicating with the inside of the heat-conducting coil (21) is opened on the fixing block (241). The hemispherical plug (243) is inserted into the through groove (245). The water inlet plate (244) is fixedly connected to the side wall of the heat-conducting coil (21). The compression spring (242) is located on the hemispherical plug (243). Between the spherical plug core (243) and the water inlet plate (244), the water inlet plate (244) has three or more liquid guiding holes (246). The compression spring (242) is closer to the liquid inlet of the main liquid pipe (22) and the force that presses the hemispherical plug core (243) against it is greater. By pressing the hemispherical plug core against it with the force of the compression spring, the position of the hemispherical plug core in the guide groove is controlled, thereby controlling the amount of heat transfer fluid passing through each heat transfer coil. The elastic force of the compression spring of each uniform flow structure is different, so that the heat transfer fluid is evenly distributed in each heat transfer coil, thereby uniformly distributing the heat transfer fluid and preventing the heat transfer rate of each heat transfer coil from being different, which would result in uneven products.

2. The method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber according to claim 1, characterized in that, The crosslinking agent is used at a rate of 0.05%-0.5% of the mass of the mixed fiber chips, and the foaming agent is used at a rate of 0.1%-0.8% of the mass of the mixed fiber chips. The complexing crosslinking agent is at least two of the following: gluconic acid, diethylenetriaminepentaacetic acid, sodium pyrophosphate, diethylenetriaminepentamethylenephosphonic acid, and aminotrimethylenephosphonic acid. The foaming agent is a polymer hollow microsphere coated with nano-calcium carbonate on an acrylic resin surface.

3. The method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber according to claim 1, characterized in that, The viscosity of the spinning mixture is 1000-1500 Pa·s; the concentration of the dilute NMMO aqueous solution is 10%-20%.

4. The method for preparing a bicomponent nonwoven fabric of Artemisia argyi fiber and water-repellent viscose fiber according to claim 1, characterized in that, The tank (11) is provided with a heating coil (110) on the outside, and the heating coil (110) is also provided with an insulation layer (111).

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