Preparation method of wormwood fiber water-repellent viscose bi-component non-woven fabric

Abstract

The invention discloses a preparation method of a wormwood fiber water-repellent viscose bi-component non-woven fabric, bi-component fibers are prepared from an NMMO solution through the steps of mixing and slicing, primary negative pressure distillation, mixing and uniform stirring, secondary negative pressure distillation, high-temperature extrusion, cooling molding and cross lapping, the materials are from plants, the shortage of fiber raw materials is effectively solved, and the wormwood fiber water-repellent viscose bi-component non-woven fabric is more environmentally friendly; a large number of air holes are distributed in the pulp through foaming treatment, a porous structure is formed in the fiber, and compared with a non-woven fabric made of single fiber or mixed carding, the non-woven fabric has multiple effects, is soft, breathable, wear-resistant, skin-friendly, fast in absorption, dry and comfortable, and has an antibacterial effect, and the non-woven fabric is more uniform in carding to form a net and more stable in performance.

Description

Technical Field

[0001] The present invention relates to the field of non-woven fabrics, and particularly to a preparation method of a two-component non-woven fabric of wormwood fiber and water-repellent viscose fiber. Background Art

[0002] With the improvement of environmental awareness, the market has an increasing demand for green and degradable materials. As a traditional Chinese medicinal material, wormwood has good antibacterial and anti-inflammatory properties and has been applied to various products. As a new type of textile material, non-woven fabrics are widely used in the fields of medical treatment, hygiene, household, etc. due to their low production cost, simple process, and strong designability. However, traditional non-woven fabrics mostly use chemically synthesized fibers, which have poor environmental protection. Therefore, it is of great significance to develop a new material that combines the characteristics of wormwood and the advantages of non-woven fabrics; At the same time, the existing preparation methods for two-component fibers can adopt the composite spinning method to make side-by-side type, core-sheath type, and multi-core type composite fibers; or the blend spinning method to make sea-island type composite fibers. By utilizing the differences in the properties of the two-component polymers, three-dimensional permanent crimp fibers, heat-bonding fibers (such as ES fibers), conductive fibers, etc. can be made. That is, the existing two-component preparation technology uses raw materials of PBT components and PET components with different performance differences to be melted separately. The PBT melt and the PET melt are extruded and compounded into a single filament bundle at the spinneret micropore orifice, and then subjected to stretching, cooling and solidification, winding forming and stretching deformation processes. In this way, there are problems such as unstable proportion of side-by-side components, low production efficiency, and poor quality in production and processing. Therefore, a preparation method of a two-component non-woven fabric of wormwood fiber and water-repellent viscose fiber needs to be proposed. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the background art and provide a preparation method of a two-component non-woven fabric of wormwood fiber and water-repellent viscose fiber.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: S1. Mix the chips. Mix the wormwood cellulose pulp with an average degree of polymerization of 300-600 and the viscose core cellulose pulp according to the mass ratio of wormwood fiber: viscose fiber = 1:1---9:1, and slice and set aside; S2. First negative pressure distillation. Distill the NMMO solution under negative pressure to keep the moisture content at 20-30%; S3. Pre-dispersion. Add the NMMO solution into the tank of the mixing device (1), and then disperse and add the sliced mixed fibers, cross-linking agent and foaming agent into the NMMO solution; S4. Mix and stir evenly. Then heat the mixture to 80°C-110°C through the mixing device, and process it with an ultrasonic stirrer and a stirring mechanism for 10 min-30 min to obtain a spinning mixture; S5, Secondary negative pressure distillation: The spinning mixture is subjected to negative pressure distillation to remove excess moisture, and the water content of the NMMO solution is maintained at 10% - 15% to obtain the spinning stock solution. S6, High - temperature extrusion: The spinning stock solution is extruded from the spinneret to form a melt stream. S7, Preliminary slow cooling: The melt stream is preliminarily cooled through a preliminary cooling device. S8, Cooling and forming: The gradually cooled melt stream enters the NMMO dilute aqueous solution for forming, and after post - treatment processes such as water washing, cutting, oiling, and drying, the artemisia argyi fiber viscose fiber bicomponent composite fiber is obtained. S9, Cross - laying: The artemisia argyi fiber viscose fiber bicomponent composite fiber is opened, mixed, carded by Carding Machine 1, and laid by Cross - laying Machine 1; then the artemisia argyi fiber and the composite bicomponent fiber are opened and carded by Carding Machine 2, and then laid by Cross - laying Machine 2; the materials from the laying machines are stacked up and down; hydroentangled on both sides to form the artemisia argyi fiber viscose fiber bicomponent hydroentangled non - woven fabric.

[0005] The present invention uses artemisia argyi cellulose pulp and viscose core fiber pulp as raw materials. After adding them to the NMMO solution and dissolving, a complexing cross - linker and a foaming agent are added, and after ultrasonic treatment, the spinning stock solution is obtained; the spinning mixture is extruded at high temperature and cooled to produce bicomponent plant fibers; then, according to the requirements of the hydroentangled non - woven fabric process, the fibers are cut, sent to the carding machine for cross - laying; hydroentangled on both sides to obtain the bicomponent non - woven fabric. This invention patent produces bicomponent fibers through the NMMO solution. The materials are from plants, effectively solving the shortage of fiber raw materials and being more environmentally friendly; through foaming treatment, a large number of air holes are distributed in the pulp, and a porous structure is formed inside the fibers. Compared with non - woven fabrics made of single fibers or mixed carding, it has multiple effects, that is, it is soft and breathable, wear - resistant and skin - friendly, fast - absorbing and dry, and also has antibacterial effects, and the non - woven fabric is more evenly formed into a web and has more stable performance.

[0006] Before entering the NMMO dilute aqueous solution, the present invention first conducts preliminary slow cooling to slowly cool down the melt stream, prevent the filament from being cooled too rapidly prematurely, and reduce the CV value of the breaking elongation of the product.

[0007] The dosage of the cross - linker is 0.05% - 0.5% of the mass of the mixed fiber chips, and the dosage of the foaming agent is 0.1% - 0.8% of the mass of the mixed fiber chips; the complexing cross - linker is at least 2 of gluconic acid, diethylenetriaminepentaacetic acid, sodium pyrophosphate, diethylenetriaminepentamethylenephosphonic acid, and aminotrimethylenephosphonic acid; the foaming agent is a polymer hollow microsphere with nano - calcium carbonate coated on the surface of acrylic resin.

[0008] Excessive amount of foaming agent will result in many voids in the fiber, making it easy to break and difficult to form a fabric; too little amount of foaming agent will result in few voids in the fiber, unable to form an obvious siphon effect, and affecting the dryness of the final product. Excessive amount of complexing crosslinking agent will cause excessive crosslinking, large fiber hardness, and poor softness after forming the fabric; too much amount of complexing crosslinking agent will cause poor forming of the two-component fiber and reduce the yield.

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

[0010] Preferably, the mixing device includes a tank body, an ultrasonic stirrer, a revolving and self-rotating stirring mechanism, a pre-dispersed material mechanism, and a first electric push rod. The top of the tank body is provided with a feed inlet. The revolving and self-rotating stirring mechanism is arranged at the inner bottom of the tank body. The pre-dispersed material mechanism is arranged above the revolving and self-rotating stirring mechanism. The first electric push rod is arranged at the top of the tank body. The ultrasonic stirrer is arranged at the push rod end of the first electric push rod.

[0011] In the present invention, the artemisia cellulose pulp, viscose core cellulose pulp, complexing crosslinking agent, and foaming agent are first dispersed and added into the NMMO solution through the pre-dispersed material mechanism, which is dispersed evenly, improving the stirring efficiency. Then, the ultrasonic stirrer is used in cooperation with the revolving and self-rotating stirring mechanism for stirring. The combination of revolution and self-rotation can make the stirrer form a more complex flow pattern in the liquid, thereby improving the mixing uniformity of the materials, reducing hairiness, and at the same time, it can also overcome the problem of local heating caused by only using the ultrasonic stirrer, resulting in too high local temperature, and can also reduce the cavitation phenomenon that occurs when only using the ultrasonic stirrer.

[0012] Preferably, the pre-dispersed material mechanism includes a first rotating tube with a hollow interior, a second electric push rod, a rotating gear, a semi-circular dispersion plate, a scraper, and a rack. The second electric push rod is arranged inside the first rotating tube. Two racks are arranged on the push rod ends of the second electric push rod in opposite directions. The rotating gear meshes with the rack. A connecting rod is arranged in the middle of the rotating gear. The middle of the semi-circular dispersion plate is provided with an installation space for placing the rotating gear. The connecting rod is arranged in the installation space. A first bearing is fixed on the side wall of the connecting rod. The outer ring of the first bearing is fixed on the side wall of the first rotating tube. The scraper is arranged above the two semi-circular dispersion plates. The scraper is fixed on the side wall of the tank body. The top of the first rotating tube is provided with a third electric push rod. The motor end of the third electric push rod is connected with a rotating motor, and the rotating motor is fixed on the tank body.

[0013] In the present invention, materials are conveyed to the semi-circular dispersion plate through the feed inlet. Then, the semi-circular dispersion plate is rotated by the rotation of the rotating motor, so that the materials on the semi-circular dispersion plate are spread by the scraper. After that, the semi-circular dispersion plate is conveyed under the liquid level of the NMMO solution by the third electric push rod. Then, the second electric push rod moves upward, causing the rack to drive the rotating gear to rotate, so that the semi-circular dispersion plate is turned downward by 90 degrees. After that, the third electric push rod drives the downward-turned semi-circular dispersion plate away from the liquid surface, thus completing the dispersion of the materials and improving the stirring efficiency.

[0014] Preferably, the revolution and rotation stirring mechanism includes a second rotating tube with a hollow interior, 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 arranged below the first rotating tube. 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. Each driving bevel gear meshes with two driven bevel gears. The stirring paddle is fixed on the side wall of the second rotating tube through the second bearing. The third bearing is arranged at the bottom of the second rotating tube. The outer ring of the third bearing is fixed with a bracket, and the bracket is fixed at the bottom of the tank body.

[0015] In the present invention, the rotation of the first rotating tube drives the rotation of the driving bevel gear, which in turn drives the rotation of the driven bevel gear, so that while the stirring paddle revolves, it also rotates. The movement mode of revolution plus rotation can enhance the shear force of the fluid, enabling the fluid to flow and mix better during the stirring process, thereby improving production efficiency and saving time and costs.

[0016] Preferably, a telescopic tube is arranged at the bottom of the first rotating tube. The telescopic tube includes an outer tube and an inner tube sleeved inside the outer tube. The outer tube is fixedly connected to the second rotating tube, and the inner tube is fixedly connected to the first rotating tube. A limiting groove is axially formed on the inner side wall of the outer tube. A clamping block is arranged on the inner tube and is matched with the limiting groove. A driving rod is arranged inside the telescopic tube. One end of the driving rod is fixedly connected to the bottom of the first rotating tube. An internal gear ring is fixedly connected to the inner side wall of the fixed tube. A driving gear is arranged at the end of the driving rod and is matched with the internal gear ring.

[0017] Preferably, in the present invention, through the cooperation of the inner tube and the outer tube, the third electric push rod can drive the dispersion plate into the interior of the liquid. The cooperation of the limiting groove and the clamping block and the cooperation of the internal gear ring and the driving gear on the driving rod enable the rotating motor to drive the revolution and rotation stirring mechanism to stir.

[0018] Preferably, the preliminary cooling device includes a plurality of heat conduction coils. The top ends of the heat conduction coils are connected to a liquid inlet main pipe, and the bottom ends of the heat conduction coils are connected to a collecting pipe. Heat conduction liquid can be added to the liquid inlet main pipe for heat conduction.

[0019] In the present invention, by placing the heat-conducting coil below the spinneret, it is ensured that the melt stream can flow through the heat-conducting coil. The heat-conducting coil radiates heat to the melt stream, causing the melt stream to cool slowly, preventing the filaments from being cooled too rapidly prematurely, reducing the non-uniformity rate of the filament bundle cross-section, and reducing the CV value of the breaking elongation of the product.

[0020] Preferably, a flow-uniforming structure is provided at the connection between the liquid inlet main pipe and the heat-conducting coil. The flow-uniforming structure includes a fixing block, a compression spring, a hemispherical plug core, and a water inlet plate. The fixing block is fixed inside the starting end of the heat-conducting coil. A conduction groove communicating with the inside of the heat-conducting coil is formed on the fixing block. The hemispherical plug core is plugged in the conduction groove. The water inlet plate is fixedly connected to the side wall of the heat-conducting coil. The compression spring is arranged between the hemispherical plug core and the water inlet plate. More than three liquid guiding holes are formed on the water inlet plate. The closer the compression spring is to the liquid inlet of the liquid inlet main pipe, the greater the force pressing the plug core tightly.

[0021] In the present invention, by the force of the compression spring pressing the hemispherical plug core tightly, the position of the hemispherical plug core in the conduction groove is controlled, thereby controlling the amount of heat-conducting liquid passing through each heat-conducting coil. The elastic forces of the compression springs of each flow-uniforming structure are different, so that each heat-conducting coil can be evenly distributed with heat-conducting liquid, thereby uniforming the heat-conducting liquid and preventing different heat-conductivity rates in each heat-conducting coil, resulting in unevenness of the product.

[0022] Preferably, a heating coil is provided on the outer side of the tank body, and there is also a heat-insulating layer outside the heating coil.

[0023] The fiber of this invention patent has two components, with a lower absorption rate than ordinary bamboo fibers, and the dryness is improved; Adopting a foaming process, the foaming agent foams the fiber at high temperature to form a porous structure, the fiber absorption speed is accelerated, and the air permeability is better after being made into non-woven fabric, improving the experience; Adopting ultrasonic wave-assisted treatment can increase the cellulose content of the spinning dope, and the two celluloses can be mixed evenly; Compared with the traditional plant fiber mixing and carding process, the fiber web of this invention patent is more uniform and the performance is more stable.

[0024] In summary, the beneficial effects of the present invention: 1. The present invention uses wormwood cellulose pulp and viscose core fiber pulp as raw materials. After adding them to an NMMO solution for dissolution, a complexing crosslinking agent and a foaming agent are added, and then ultrasonic treatment is carried out to obtain a spinning mixed stock solution. The spinning mixed solution is extruded at a high temperature and then cooled to obtain bicomponent plant fibers. Then, according to the requirements of the hydroentangling cloth process, the fibers are cut and fed into a carding machine for cross-laying; both sides are hydroentangled and reinforced; a bicomponent non-woven fabric is obtained. This invention patent uses an NMMO solution to prepare bicomponent fibers, and the materials are derived from plants, effectively solving the shortage of fiber raw materials and being more environmentally friendly; through foaming treatment, a large number of breathable holes are distributed in the pulp, and a porous structure is formed inside the fibers. Compared with non-woven fabrics made of single fibers or mixed carding, it has multiple functions, that is, it is soft and breathable, wear-resistant and skin-friendly, fast-absorbing and dry, and also has antibacterial effects, and the non-woven fabric is more evenly formed into a web and has more stable performance; 2. Before entering the dilute NMMO aqueous solution, the present invention first performs preliminary slow cooling to slowly cool the melt stream, prevent the filament from being prematurely and rapidly cooled, and reduce the CV value of the breaking elongation of the product; 3. The present invention first disperses and adds wormwood cellulose pulp, viscose core cellulose pulp, a complexing crosslinking agent, and a foaming agent into the NMMO solution through a pre-dispersed material mechanism, dispersing them evenly to improve the stirring efficiency. Then, an ultrasonic stirrer is used in combination with a revolution and rotation stirring mechanism for stirring. The combination of revolution and rotation can make the stirrer form a more complex flow pattern in the liquid, thereby improving the mixing uniformity of the materials, reducing hairiness, and at the same time being able to overcome the problem of local heating caused by only using an ultrasonic stirrer, resulting in too high local temperature, and also being able to reduce the cavitation phenomenon that occurs when only using an ultrasonic stirrer; 4. The present invention transports the materials to the semi-circular dispersion plate through the feed port, and then rotates the semi-circular dispersion plate through a rotating motor, so that the materials on the semi-circular dispersion plate are flattened by the scraper. Then, the semi-circular dispersion plate is transported under the liquid level of the NMMO solution through a third electric push rod. Then, the second electric push rod moves upward, causing the rack to drive the rotating gear to rotate, so that the semi-circular dispersion plate is turned downward by 90 degrees. Then, the third electric push rod drives the downward-turned semi-circular dispersion plate away from the liquid level, thus completing the dispersion of the materials and improving the stirring efficiency; 5. The present invention places a heat-conducting coil pipe under the spinneret to ensure that the melt stream can flow through the heat-conducting coil pipe. The heat-conducting coil pipe radiates heat to the melt stream, slowly cooling the melt stream, preventing the filament from being prematurely and rapidly cooled, reducing the unevenness rate of the filament cross-section, and reducing the CV value of the breaking elongation of the product. Description of the Drawings

[0025] Figure 1 is a schematic diagram of the downward flipping of the semi-circular dispersion plate of the mixing device of the present invention; Figure 2It is a schematic diagram of the flat laying of the semi-circular dispersion plate of the mixing device of the present invention; Figure 3 It is a schematic diagram of the semi-circular dispersion plate and the revolving and self-rotating stirring mechanism of the present invention; Figure 4 It is a schematic diagram of the rack and the rotating gear of the present invention; Figure 5 It is a top view schematic diagram of the pre-dispersed material mechanism of the present invention; Figure 6 It is the present invention Figure 5 The enlarged schematic diagram of part A; Figure 7 It is a sectional view schematic diagram of the revolving and self-rotating stirring mechanism of the present invention; Figure 8 It is a three-dimensional schematic diagram of the revolving and self-rotating stirring mechanism of the present invention; Figure 9 It is a top view sectional view schematic diagram of the outer tube and the inner tube of the telescopic tube of the present invention; Figure 10 It is the present invention Figure 7 The enlarged schematic diagram of part B; Figure 11 It is a schematic diagram of the preliminary cooling device of the present invention; Figure 12 It is a sectional view schematic diagram of the flow equalizing structure of the present invention; Figure 13 It is a sectional view schematic diagram of the hemispherical plug core of the flow equalizing structure of the present invention being lifted up. Specific embodiments

[0026] The following specific embodiments are only explanations of the present invention, and they are not limitations of the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment as needed after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0027] The present invention will be described in detail below with reference to the accompanying drawings by way of examples.

[0028] Example

[0029] A preparation method of an artemisia fiber water-repellent viscose fiber bicomponent non-woven fabric includes the following steps: S1, Mixing slices, mixing artemisia cellulose pulp with an average degree of polymerization of 300 - 600 and viscose core cellulose pulp, and preparing mixed slices for use according to the mass ratio of artemisia fiber: viscose fiber = 1:1 --- 9:1; S2, First negative pressure distillation, performing negative pressure distillation on the NMMO solution to keep the moisture content at 20 - 30%; S3. Pre-dispersion: Add the NMMO solution into the tank of the mixing device 1, and then disperse the sliced mixed fibers, cross-linking agent and foaming agent into the NMMO solution. S4. Mixing and stirring: Then heat to 80°C - 110°C through the mixing device 1, and use the ultrasonic stirrer to cooperate with the stirring mechanism for 10 min - 30 min to obtain the spinning mixed solution. S5. Secondary negative pressure distillation: Distill the spinning mixed solution under negative pressure to remove excess water, and keep the water content of the NMMO solution at 10% - 15% to obtain the spinning mixed stock solution. S6. High-temperature extrusion: Extrude the spinning mixed stock solution from the spinneret to form a melt stream. S7. Preliminary slow cooling: Cool the melt stream through the preliminary cooling device 2 for preliminary cooling. S8. Cooling and forming: Feed the gradually cooled melt stream into the NMMO dilute aqueous solution for forming, and then obtain the artemisia argyi fiber viscose fiber bicomponent composite fiber after post-treatment processes such as washing, cutting, oiling, and drying. S9. Cross-laying: Loosen and mix the artemisia argyi fiber viscose fiber bicomponent composite fiber, feed it into the first carding machine for carding, and then lay it on the first cross-laying machine; then loosen the artemisia argyi fiber and the composite bicomponent fiber and feed them into the second carding machine for carding, and then into the second cross-laying machine for carding and laying; stack the materials from the laying machines up and down; form by hydroentangling on both sides to obtain the artemisia argyi fiber viscose fiber bicomponent hydroentangled non-woven fabric.

[0030] The dosage of the cross-linking agent is 0.05% - 0.5% of the mass of the mixed fiber slices, and the dosage of the foaming agent is 0.1% - 0.8% of the mass of the mixed fiber slices; the complex cross-linking agents are at least 2 of gluconic acid, diethylenetriaminepentaacetic acid, sodium pyrophosphate, diethylenetriamine pentamethylene phosphonic acid, and aminotrimethylene phosphonic acid; the foaming agent is a polymer hollow microsphere with nano calcium carbonate coated on the surface of acrylic resin.

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

[0032] As Figure 1 shown, the mixing device 1 includes a tank body 11, an ultrasonic stirrer 12, a planetary and self-rotating stirring mechanism 13, a pre-dispersion material mechanism 14, and a first electric push rod 15. The planetary and self-rotating stirring mechanism 13 is arranged at the inner bottom of the tank body 11, the pre-dispersion material mechanism 14 is arranged above the planetary and self-rotating stirring mechanism 13, the first electric push rod 15 is arranged at the top of the tank body 11, the ultrasonic stirrer 12 is arranged at the push rod end of the first electric push rod 15, a heating coil 110 is arranged outside the tank body 11, and there is also a heat preservation layer 111 outside the heating coil 110.

[0033] AsFigure 1-2 As shown in the figure, the pre-dispersed material mechanism 14 includes a first rotating tube 141 with a hollow interior, a second electric push rod 142, a rotating gear 143, a semi-circular dispersion plate 144, a scraper 145, and a rack 146. The second electric push rod 142 is arranged inside the first rotating tube 141. The two racks 146 are arranged on the push rod end of the second electric push rod 142 in opposite directions. The rotating gear 143 meshes with the rack 146. A connecting rod 148 is arranged in the middle of the rotating gear 143. The middle of the semi-circular dispersion plate 144 is provided with an installation space 147 for placing the rotating gear 143. The connecting rod 148 is arranged 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 on the side wall of the first rotating tube 141. The scraper 145 is arranged above the two semi-circular dispersion plates 144. The scraper 145 is fixed on the side wall of the tank body 11. A third electric push rod 150 is arranged at the top of the first rotating tube 141. The motor end of the third electric push rod 150 is connected to a rotating motor 146. The rotating motor 146 is fixed on the tank body 11.

[0034] As Figure 7-8 shown in the figure, the revolution and rotation stirring mechanism 13 includes a second rotating tube 131 with a hollow interior, 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 arranged below the first rotating tube 141. 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. 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 through the second bearing 137. The third bearing 134 is arranged 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 on the bottom of the tank body 11. Hemispherical grooves are arranged in a staggered manner on the stirring paddle. The hemispherical grooves generate three-dimensional flow and are subjected to comprehensive actions such as shearing, peeling, coordination, and kneading, so that the materials are further mixed sufficiently and the filaments are further reduced.

[0035] As Figure 9As shown, a telescopic tube 16 is provided at the bottom of the first rotating tube 141. 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 axially formed on the inner side wall of the outer tube 161. A clamping block 163 is provided on the inner tube 162 and is matched with the limiting groove 163. A driving rod 164 is arranged 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 side wall of the fixed tube 136. A driving gear 167 matched with the internal gear ring 166 is arranged at the end of the driving rod 164.

[0036] As Figure 11 shown, the preliminary cooling device 2 includes a plurality of heat conduction coils 21. The top ends of the heat conduction coils are connected to a liquid inlet main pipe 22, and the low ends of the heat conduction coils are connected to a collecting pipe 23.

[0037] As Figure 12-13 shown, a flow equalizing structure 24 is provided at the connection between the liquid inlet main pipe 22 and the heat conduction coil 21. The flow equalizing 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 conduction coil 21. A conduction groove 245 communicating with the inside of the heat conduction coil 21 is formed on the fixing block 241. The hemispherical plug core 243 is plugged in the conduction groove 245. The water inlet plate 244 is fixedly connected to the side wall of the heat conduction coil 21. The compression spring 242 is arranged between the hemispherical plug core 243 and the water inlet plate 244. More than three liquid guiding holes 246 are formed on the water inlet plate 244. The closer the compression spring 242 is to the liquid inlet of the liquid inlet main pipe 22, the greater the force for pressing the plug core 93.

[0038] Working principle: As Figure 1-11As shown in the figure, when mixing and stirring, the NMMO solution is added into the tank body 11. Then, the mixture of artemisia cellulose pulp and viscose core cellulose pulp is conveyed to the semi-circular dispersion plate 144 through the feed port. Then, the rotating motor drives the semi-circular dispersion plate 144 to rotate slowly, so that the scraper 145 levels the material. Then, the third electric push rod 150 drives the two semi-circular dispersion plates 144 to be conveyed under the liquid level of the NMMO solution. Then, the second electric push rod 142 moves upward, so that the rack 146 drives the rotating gear 143 to rotate, and the semi-circular dispersion plate flips downward by 90 degrees. Then, the third electric push rod 150 drives the downward-flipped semi-circular dispersion plate 144 to leave the liquid level, thus completing the dispersion of the material in the solution. When the semi-circular dispersion plate 144 returns to its original position, the second electric push rod 142 moves downward, so that the rack 146 drives the rotating gear 143 to rotate, and the semi-circular dispersion plate flips upward by 90 degrees to return to its original position. Then, the complexing cross-linking agent and the foaming agent are also separately dispersed and added into the NMMO solution. After complete dispersion, the semi-circular dispersion plate 144 can maintain the state of flipping downward by 90 degrees. Then, with the ultrasonic stirrer and the revolution and rotation stirring mechanism for stirring. Then, the ultrasonic stirrer works, and at the same time, the rotating motor rotates, driving the semi-circular dispersion plate flipped downward by 90 degrees 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] Hydroentangled non-woven fabric test items

Claims

1. A method for preparing a bicomponent nonwoven fabric of wormwood fiber and water-repellent viscose fiber, characterized in that: The following steps are involved: S1, mixing and slicing, mixing and slicing wormwood cellulose pulp with an average polymerization degree of 300-600 and viscose core cellulose cellulose pulp according to a mass ratio of wormwood fiber to viscose fiber = 1:1---9:1 for standby use; S2, a negative pressure distillation, the NMMO solution is distilled under negative pressure to maintain a water content of 20-30%; S3, pre-dispersing, adding the NMMO solution into the tank of the mixing device (1), and then dispersing the sliced ​​mixed fiber, the cross-linking agent and the foaming agent into the NMMO solution; S4, mixing and stirring, then heating to 80°C-110°C by a mixing device (1), and treating for 10min-30min with an ultrasonic stirrer and a stirring mechanism to obtain a spinning mixture; S5, secondary negative pressure distillation, the spinning mixed solution is distilled under negative pressure to remove excess water, and the water content of the NMMO solution is maintained at 10%-15%, to obtain a spinning mixed solution; S6, high temperature extrusion, the spinning mixed solution is extruded from the spinneret to form a melt stream; S7, preliminary slow cooling, the melt stream passes through the preliminary cooling device (2) for preliminary cooling; S8, cooling and forming, the gradually cooled melt stream is fed into a dilute NMMO aqueous solution for forming, and then after post-processing steps such as washing, cutting, oiling, and drying, a two-component composite fiber of wormwood fiber and viscose fiber is obtained; S9, cross-lapping, loosen and mix the two-component composite fiber of wormwood fiber and viscose fiber, enter the carding machine 1 for combing, and cross-lapping machine 1 for web laying; then loosen the wormwood fiber and the composite two-component fiber and enter the carding machine 2 for combing, and enter the cross-lapping machine 2 for combing and web laying; overlap the incoming materials of the web laying machine up and down; hydroentangle the two sides to obtain the wormwood fiber viscose fiber two-component hydroentangled non-woven fabric.

2. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: The amount of the crosslinking agent is 0.05%-0.5% of the mass of the mixed fiber slice, and the amount of the foaming agent is 0.1%-0.8% of the mass of the mixed fiber slice; the complexing crosslinking agent is at least two of gluconic acid, diethylenetriaminepentaacetic acid, sodium pyrophosphate, diethylenetriaminepenta(methylenephosphonic acid) and aminotri(methylenephosphonic acid); the foaming agent is a high-molecular hollow microsphere with nano-calcium carbonate coated on the surface of acrylic resin.

3. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: The viscosity of the spinning mixed solution is 1000-1500 Pa.S; the concentration of the NMMO dilute aqueous solution is 10% to 20%.

4. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: The mixing device (1) comprises a tank body (11), an ultrasonic stirrer (12), a revolution and rotation stirring mechanism (13), a material pre-dispersing mechanism (14), and a first electric push rod (15); the revolution and rotation stirring mechanism (13) is arranged at the inner bottom of the tank body (11); the material pre-dispersing mechanism (14) is arranged above the revolution and rotation stirring mechanism (13); the first electric push rod (15) is arranged at the top of the tank body (11); and the ultrasonic stirrer (12) is arranged at the push rod end of the first electric push rod (15).

5. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: The material pre-dispersing mechanism (14) comprises a first rotating tube (141) with a hollow interior, a second electric push rod (142), a rotating gear (143), a semicircular dispersing plate (144), a scraper (145), and a rack (146); the second electric push rod (142) is arranged inside the first rotating tube (141); two racks (146) are arranged at the push rod end of the second electric push rod (142) in opposite directions; the rotating gear (143) and the rack (146) are meshed with each other; a connecting rod (148) is provided in the middle of the rotating gear (143); and a spacer (144) is provided in the middle of the semicircular dispersing plate (144) for accommodating the rotating gear (143). An installation space (147) is provided in the installation space (147), a first bearing (149) is fixed on the side wall of the connecting rod (148), an 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 semicircular dispersion plates (144), the scraper (145) is fixed on the side wall of the tank body (11), a third electric push rod (150) is provided on the top of the first rotating tube (141), a motor end of the third electric push rod (150) is connected to a rotating motor (146), and the rotating motor (146) is fixed on the tank body (11).

6. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 5, characterized in that: The revolving and rotating stirring mechanism (13) comprises a second rotating tube (131) with a hollow interior, 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 arranged below the first rotating tube (141); the fixed tube (136) is fixed in the second rotating tube (131); the two main bevel gears (132) are evenly distributed on the side wall of the fixed tube (136); each main bevel gear (132) is meshed with two driven bevel gears (133); the stirring paddle (135) is fixed to the side wall of the second rotating tube (131) via the second bearing (137); the third bearing (134) is arranged at the bottom of the second rotating tube (131); a bracket (138) is fixed to the outer ring of the third bearing (134); and the bracket (138) is fixed to the bottom of the tank body (11).

7. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 6, characterized in that: A telescopic tube (16) is provided at the bottom of the first rotating tube (141), the telescopic tube comprising 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); the inner tube (162) is fixedly connected to the first rotating tube (141); a limiting groove (164) is provided on the inner side wall of the outer tube (161) along the axial direction; a clamping block (163) is provided on the inner tube (162) and cooperates with the limiting groove (163); 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 inner gear ring (166) is fixed to the inner side wall of the fixed tube (136); a driving gear (167) is provided at the end of the driving rod (164) and cooperates with the inner gear ring (166).

8. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: The preliminary cooling device (2) comprises a plurality of heat-conducting coils (21), the top ends of the heat-conducting coils being connected to a liquid inlet main pipe (22), and the bottom ends of the heat-conducting coils being connected to a collecting pipe (23).

9. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: A flow-uniform structure (24) is provided at the connection between the liquid inlet main pipe (22) and the heat-conducting coil (21), the flow-uniform structure (24) comprising a fixed block (241), a compression spring (242), a hemispherical plug core (243), and a water inlet plate (244). The fixed block (241) is fixed inside the starting end of the heat-conducting coil (21). A conducting groove (245) communicating with the inside of the heat-conducting coil (21) is provided on the fixed block (241). The spherical plug core (243) is plugged in the conducting 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 arranged between the hemispherical plug core (243) and the water inlet plate (244), and the water inlet plate (244) is provided with more than three liquid conduction holes (246). The closer the compression spring (242) is to the liquid inlet of the liquid inlet main pipe (22), the greater the force of the plug core (93) pressed against it.

10. The method for preparing a water-repellent viscose bicomponent non-woven fabric of wormwood fiber according to claim 1, characterized in that: A heating coil (110) is provided on the outside of the tank body (11), and a heat-insulating layer (111) is provided outside the heating coil (110).

Images