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CN-115652449-B - Preparation method of nylon 6 with low pore number, high cohesion and high strength

CN115652449BCN 115652449 BCN115652449 BCN 115652449BCN-115652449-B

Abstract

The invention relates to a preparation method of nylon 6 with low hole number and high cohesion and high strength, which comprises the steps of extruding nylon 6 slices with water content of 350-450ppm through a screw extruder, quantitatively conveying the nylon 6 slices to a spinning assembly through a metering pump to be sprayed out to form fibers, wherein a plurality of hooks are arranged on the radial section of the fibers at intervals along the circumferential direction, sequentially conveying the sprayed fibers to a slow cooler, a monomer suction device and a side blowing device, uniformly cooling the sprayed fibers through side blowing to form tows, conveying the tows to a spinning beam strengthening oiling device with a nozzle, a wire guide hook and a blowing beam bundling device, enabling a plurality of tows to be respectively oiled through the nozzle and the corresponding wire guide hook, finally enabling the plurality of tows to be conveyed into the blowing beam bundling device together through compressed air, enabling the oiled tows on the tows to be blown uniformly through a pre-network device, then enabling the tows to be drafted through a roller and a two rollers, heating the tows to be disturbed through a main network device, and winding the tows at a winding head after the tension is adjusted through a wire guide disc. The high-strength nylon 6 yarn bundles prepared by the preparation method have strong cohesion, are not easy to separate under the action of external force, and can play a good role in preventing yarn hooking after being woven into the fabric.

Inventors

  • ZHENG YULEI

Assignees

  • 福建省恒申合纤科技有限公司

Dates

Publication Date
20260505
Application Date
20221031

Claims (6)

  1. 1. The preparation method of the nylon 6 with low pore number, high cohesion and high strength is characterized by comprising the following steps: (1) Extruding nylon 6 slices with the water content of 350-450ppm through a screw extruder, quantitatively conveying the nylon 6 slices to a spinning component through a metering pump, and spraying out the nylon 6 slices to form fibers, wherein the radial section of the fibers is provided with a plurality of hooks at intervals along the circumferential direction, the set temperature of the screw extruder is 255-280 ℃, the spinning component is provided with a spinneret plate, a plurality of spinneret holes with the same shape and size are distributed on the spinneret plate at intervals, the spinneret holes are formed by at least three outward arrow shapes at intervals along the circumferential direction, and the other ends of the arrows are connected and the same; (2) The sprayed fiber sequentially passes through a slow cooler and a single suction device and is uniformly cooled by side blowing; (3) The spinning beam strengthening oiling device comprises a nozzle holder, at least three nozzles for spinning oiling are arranged on the nozzle holder at intervals, guide hooks which correspond to the number of the nozzles and are used for guiding wires are arranged on the lower side of the nozzle holder, a blowing beam gathering device frame is arranged on the lower side of the guide hook holder, a blowing beam gathering device for realizing the beam gathering of spinning is arranged on the blowing beam gathering device frame, one end of the air guide pipe is connected with a compressed air pipeline, a switch for controlling the pressure of the compressed air is arranged on the compressed air pipeline, and a beam gathering hole is arranged on the other end of the air guide pipe, and the air guide pipe is provided with a beam gathering hole which is provided with a beam inlet and a beam gathering hole; (4) The tow subjected to oiling and bundling is sent to a pre-networking device to blow the oiling agent on the tow uniformly, and then is subjected to drafting and shaping by a first roller and a second roller, and the upper network is disturbed by a main networking device to improve the cohesion of the tow; (5) And after the spinning tension is regulated by the yarn guiding disc, winding into yarn cakes at the winding head.
  2. 2. The preparation method of the low-pore-number high-cohesion high-strength nylon 6 is characterized in that in the step (2), the temperature of the slow cooler is 230-270 ℃, the pressure of a smoke suction position of a monomer suction device is 0.1-0.3barr, the wind speed of a lateral blowing wind is 0.3-0.6m/s, and the wind temperature is 19-23 ℃.
  3. 3. The preparation method of the low-hole-number high-cohesion high-strength nylon 6 is characterized in that the oil nozzle frame comprises an oil feeding main pipe connected with an oil supply pipe, a fixed ring is arranged at the other end of the oil feeding main pipe, oil feeding branch pipes are arranged on the fixed ring at intervals, the oil nozzle is arranged at the other end of the oil feeding branch pipes, a through groove for a silk bundle to pass through is vertically formed in the oil nozzle, and an oil spraying port communicated with the oil feeding branch pipes is formed in the oil nozzle.
  4. 4. The method for preparing the high-strength nylon 6 with low pore number and high cohesion according to claim 1, wherein in the step (4), the pressure of the pre-network device is 0.05-0.1MPa, the speeds of the first roller and the second roller are respectively 1200-2000m/min and 3600-5000m/min, the temperature of the second roller is 140-205 ℃, and the pressure of the main network device is 0.45-0.75MPa.
  5. 5. The method for preparing the nylon 6 with low pore number, high cohesion and high strength according to claim 1, 3 or 4, wherein in the step (4), the pressures of the first main network device and the second main network device are both 0.45-0.75MPa.
  6. 6. The method for preparing the nylon 6 with low pore number, high cohesion and high strength according to claim 1, wherein in the step (5), the speed of the yarn guiding disc is 3500-4960m/min, and the winding speed of the winding head is 3400-4900m/min.

Description

Preparation method of nylon 6 with low pore number, high cohesion and high strength Technical Field The invention relates to a preparation method of nylon 6 with low pore number, high cohesion and high strength. Background The high-strength nylon 6 is widely applied to the fields of aerospace, army and army, sportswear and the like due to higher breaking strength. However, when preparing fibers with low pore numbers (F number is lower than 10), the fibers are difficult to be networked by air pressure due to the fact that 1. The number of monofilaments is small, and 2. The fibers are stretched more because of the high stretching ratio of the fibers and the difficulty in blowing the high-strength nylon 6 network points by air pressure due to the fact that the higher strength (> 6.0 cN/detx) needs to be obtained during spinning due to the fact that the high-strength nylon 6 is high in strength. The network is harder to get on along with the increase of the strength of the nylon 6, meanwhile, most of nylon 6 has round cross sections, the cohesion of fibers with round cross sections is poor under the condition that no network point is arranged, tows are easy to loose, the follow-up weaving is not facilitated, and the yarn hooking preventing performance of the woven fabric is poor. Disclosure of Invention The invention aims to provide a preparation method of high-strength nylon 6 with low pore number and high cohesion, which is characterized in that the high-strength nylon 6 yarn bundles prepared by the preparation method have strong cohesion, are not easy to separate under the action of external force, and have very good yarn hooking prevention performance after being woven into fabrics. The technical scheme of the invention is that the preparation method of the nylon 6 with low pore number, high cohesion and high strength comprises the following steps: (1) Extruding nylon 6 slices with the water content of 350-450ppm through a screw extruder, quantitatively conveying the nylon 6 slices to a spinning component through a metering pump, and spraying out the nylon 6 slices to form fibers, wherein a plurality of hook parts are arranged on the radial section of the fibers at intervals along the circumferential direction; (2) The sprayed fiber sequentially passes through a slow cooler and a single suction device and is uniformly cooled by side blowing; (3) Then the filament bundles are sent into a spinning beam strengthening oiling device with a nozzle tip, a filament guiding hook and a blowing beam gathering device, all filaments sprayed out of one spinneret plate are divided into a plurality of filament bundles to be respectively oiled through the nozzle tip and the corresponding filament guiding hook, and finally the filament bundles are sent into the blowing beam gathering device together and are hooked together by compressed air; (4) The tow subjected to oiling and bundling is sent to a pre-networking device to blow oiling agent on the tow uniformly, and then is drawn and shaped through a first roller and a second roller, and the upper network is disturbed through a main networking device so as to improve cohesion of the tow; (5) And after the spinning tension is regulated by the yarn guiding disc, winding into yarn cakes at the winding head. Further, in the step (1), the set temperature of the screw extruder is 255-280 ℃. Further, the spinning component is provided with a spinneret plate, a plurality of spinneret orifices with the same shape and size are distributed on the spinneret plate at intervals, and the spinneret orifices are formed by at least three outward arrow-shaped shapes which are arranged at intervals along the circumferential direction. Further, in the step (2), the temperature of the slow cooler is 230-270 ℃, the pressure of a smoke suction part of the monomer suction device is 0.1-0.3bar, the wind speed of the lateral blowing is 0.3-0.6m/s, and the wind temperature is 19-23 ℃. Further, the spinning bundling reinforcing oiling device comprises a nozzle holder, at least three nozzles for spinning oiling are arranged on the nozzle holder at intervals, a wire guide hook holder is arranged on the lower side of the nozzle holder, wire guide hooks which correspond to the number of the nozzles and are used for guiding wires are arranged on the wire guide hook holder at intervals, a blowing bundling device holder is arranged on the lower side of the wire guide hook holder, and a blowing bundling device used for spinning to penetrate through and achieve bundling is arranged on the blowing bundling device holder. Further, the oil nozzle frame comprises an oil feeding main pipe connected with an oil supply pipe, a fixed ring is arranged at the other end of the oil feeding main pipe, oil feeding branch pipes are arranged on the fixed ring at intervals, the oil nozzle is arranged at the other end of the oil feeding branch pipes, a through groove for a silk bundle to pass through is vertically formed in the o