Full-roll polyester pre-oriented yarn and preparation method thereof

Abstract

The invention relates to the technical field of polyester pre-oriented yarn (POY) spinning, in particular to a full-roll polyester pre-oriented yarn and a preparation method thereof. A toughening and reinforcing layer is deposited on the surface of a monofilament in the fully-rolled polyester pre-oriented yarn, and the toughening and reinforcing layer is prepared from a nanofiller with a length-diameter ratio and latex particles; the nanofiller with the length-diameter ratio comprises at least one of a zinc oxide nanowire, a titanium dioxide nanowire, a silicon dioxide nanowire, a silver nanowire, a PANI nanowire, a silicon carbide nanowire and a single-walled carbon nanotube. According to the method, the surface treatment procedure is carried out on the primary monofilament after high-speed winding forming, a toughening and reinforcing layer is formed on the surface of the primary monofilament, the breaking strength of the polyester pre-oriented yarn is improved, the end breakage rate in the process of stretching the textured yarn is reduced, and the production efficiency of the textured yarn is improved.

Description

Technical Field

[0001] This invention relates to the field of polyester POY spinning technology, and in particular to a full roll of pre-oriented polyester yarn and its preparation method. Background Technology

[0002] Polyester pre-oriented yarn (polyester POY) is also known as polyester partially oriented yarn. It is produced by changing the crystallinity (crystallinity <5%) of the extruded yarn through high-speed spinning (spinning speed 2800-4000m / min). It has excellent storage stability and post-processing properties, but it has low breaking strength, high breaking elongation and poor dimensional stability. It is used as POY raw yarn to prepare textured yarn (DTY, TY) and drawn yarn (DY) through post-processing.

[0003] Polyester POY suffers from low tensile strength and poor dimensional stability, resulting in a high breakage rate during processing into textured yarn, which affects the production efficiency of textured yarn. To improve the breakage rate of existing polyester POY, the inventors provide a full-roll polyester pre-oriented yarn and its preparation method. Summary of the Invention

[0004] To address the problem of high breakage rate during the stretching and warping of existing polyester POY due to its low breaking strength, this invention provides a fully rolled polyester pre-oriented yarn and its preparation method.

[0005] The present invention provides a full roll of pre-oriented polyester yarn, which is achieved through the following technical solution: A toughening and reinforcing layer is deposited on the surface of a single filament in a full roll of pre-oriented polyester yarn. The toughening and reinforcing layer is made of aspect ratio nanofillers and latex particles. The aspect ratio nanofillers include at least one of zinc oxide nanowires, titanium dioxide nanowires, silicon dioxide nanowires, silver nanowires, PANI nanowires, silicon carbide nanowires, and single-walled carbon nanotubes.

[0006] This invention improves the breaking strength of polyester pre-oriented yarn by performing a surface treatment process on the nascent monofilament after high-speed winding and forming, thereby forming a toughening and reinforcing layer on the surface of the nascent monofilament, reducing the breakage rate during the stretching and texturing process, and improving the production efficiency of stretching and texturing yarn.

[0007] Preferably, the latex particles are at least one of polyurethane latex particles and epoxy latex particles with a particle size of less than 100 nm.

[0008] More preferably, the aspect ratio nanofiller is zinc oxide nanowire with a diameter of 5-200 nm, a length of 0.15-20 μm, and an aspect ratio >20; the latex particles are provided by an aqueous polyurethane dispersion, and the particle size of the polyurethane latex particles is <100 nm.

[0009] The aspect ratio nanofiller of this invention is surface-composite with latex particles. The aspect ratio nanofiller is attached to the surface of polyester nascent yarn through the latex particles. The aspect ratio nanofiller improves the breaking strength of polyester nascent yarn, reduces the breakage rate during the stretching and texturing process, and improves the production efficiency of stretching and texturing yarn.

[0010] The present invention provides a method for preparing a full roll of pre-oriented polyester yarn, which is achieved through the following technical solution: A method for preparing a full roll of pre-oriented polyester yarn is as follows: polyester chips drying → melt extrusion → polyester melt conveying → spinning box → metering pump → spinneret extrusion → ring air cooling → high-speed winding → surface treatment → bundling to obtain a full roll of pre-oriented polyester yarn. The surface treatment process is as follows: negative charge treatment of the nascent yarn surface → deposition of positively charged nanofillers on the surface → heat treatment.

[0011] Preferably, the surface treatment process of the nascent filament involves treating the surface of the nascent filament with a negative charge, specifically as follows: the nascent filament formed by high-speed winding is subjected to plasma surface treatment, and the treatment gas is ozone.

[0012] Preferably, the surface treatment process involves depositing positively charged nanofillers on the surface, specifically as follows: the nascent filaments that have undergone plasma surface treatment are input into a chamber containing a toughening and reinforcing particle atmosphere modified by a siloxane coupling agent, and the deposition time is 3-6 seconds. The positively charged nanofillers are deposited on the surface of the nascent filaments by electrostatic force.

[0013] Preferably, the siloxane coupling agent in the toughening and reinforcing particles modified with the siloxane coupling agent is an aminosilane, and the toughening and reinforcing particles are composed of aspect ratio nanofillers with surface composite latex particles.

[0014] Preferably, the heat treatment in the surface treatment process is as follows: the nascent filaments of positively charged nanofillers deposited on the surface are passed through the heating through-holes of a multi-channel heater for heat treatment. The heat treatment temperature is ≥ the softening temperature of the latex particles. The residence time of the nascent filaments in the heating through-holes is 15-30s. The diameter of the heating through-holes is 1.0-1.05 times the diameter of the nascent filaments.

[0015] Preferably, in the polyester chip drying process, the moisture content of the dried polyester chips is less than 300 ppm; in the melt extrusion process, the dried polyester chips are fed into a screw extruder and melted in the screw extruder through zones one to six in sequence to form polyester melt, with the temperature range of zones one to six being 275 to 300°C.

[0016] Preferably, the temperature of the spinning box is 280-300℃, the pump supply of the metering pump is 700-800 g / min, the pressure difference between the inlet and outlet air of the ring blowing cooling process is 600-800 Pa, and the winding speed in the high-speed winding forming process is 3000-4000 m / min.

[0017] In summary, the present invention has the following advantages: 1. By performing a surface treatment process on the nascent yarn, the breaking strength of the nascent yarn and the breaking strength of the fully wound polyester pre-oriented yarn after bundling are improved, the breakage rate of polyester pre-oriented yarn during the stretching and texturing process is reduced, the production efficiency of stretching and texturing yarn is improved, and the production cost of stretching and texturing yarn is optimized.

[0018] 2. In this invention, plasma surface treatment is applied to the nascent filaments to impart negative electrical charge to their surface. Positively charged nanofillers are deposited on the surface of the nascent filaments under electrostatic force. Subsequently, the nascent filaments are fed into the heating holes of a multi-channel heater for heat treatment. The latex particles on the surface of the toughening and reinforcing particles are softened by heat and then composited with the nascent filaments, thus depositing a toughening and reinforcing layer on the surface of the nascent filaments. This improves the breaking strength of the bundled full-roll polyester pre-oriented filaments, thereby reducing the breakage rate during the stretching and deformation process. Detailed Implementation

[0019] To further understand the inventiveness and technical advancements of this invention, the preferred embodiments of this invention will be discussed in detail below with reference to examples and comparative examples.

[0020] Example: A toughening and reinforcing layer is deposited on the surface of the monofilament in a full roll of polyester pre-oriented yarn, thereby improving the breaking strength of the bundled full roll of polyester pre-oriented yarn, reducing the breakage rate of polyester pre-oriented yarn during the stretching and texturing process, and improving the efficiency of processing and producing stretching and texturing yarn from this polyester pre-oriented yarn.

[0021] The toughening and reinforcing layer is made of mutually bonded toughening and reinforcing particles, which include aspect ratio nanofillers and latex particles. The latex particles are composited on the surface of the aspect ratio nanofillers.

[0022] The aspect ratio nanofillers include at least one of zinc oxide nanowires, titanium dioxide nanowires, silicon dioxide nanowires, silver nanowires, PANI nanowires, silicon carbide nanowires, and single-walled carbon nanotubes.

[0023] The preferred aspect ratio nanofiller is zinc oxide nanowires, with a diameter of 5-200 nm, a length of 0.15-20 μm, and an aspect ratio >20. Zinc oxide nanowires can improve the breaking strength of polyester pre-oriented yarns, and also endow them with good antibacterial and hygienic properties as well as UV aging resistance.

[0024] The latex particles are provided by an aqueous polyurethane dispersion. The particle size of the polyurethane latex particles is <100nm, which allows the aspect ratio nanofiller to firmly adhere to the surface of the nascent monofilament, ensuring the breaking strength of the polyester pre-oriented yarn. At the same time, the excellent adhesion can avoid clogging problems caused by "powder shedding" during the subsequent oiling process.

[0025] The preparation method of full roll polyester pre-oriented yarn is as follows: polyester chips drying → melt extrusion → polyester melt conveying → spinning box → metering pump → spinneret extrusion → ring blow cooling → high speed winding → surface treatment → bundling → oiling → winding to obtain full roll polyester pre-oriented yarn.

[0026] Polyester chip drying: Place in a vacuum drying oven, first dry at 95±5℃ for 3±1h under normal pressure, then raise the temperature to 105±5℃, evacuate to 20-30KPa and vacuum dry for 4±1h, then evacuate to 4-8.0KPa and vacuum dry for 8±2h to obtain polyester chips with a moisture content of less than 300ppm.

[0027] In the melt extrusion process, the dried polyester chips are fed into the screw extruder and melted sequentially through zones one to six to form polyester melt. The temperature range of zones one to six is ​​275 to 300℃. Specifically, the temperature of zone one of the screw extruder is 275℃ to 280℃, zone two is 280℃ to 285℃, zone three is 290℃ to 295℃, zone four is 295℃ to 300℃, zone five is 295℃ to 300℃, zone six is ​​295℃ to 300℃, and the extrusion die temperature is 295-300℃.

[0028] The temperature of the spinning box is 280-300℃.

[0029] The metering pump has a pumping capacity of 700–800 g / min.

[0030] In the ring-blowing cooling process, the pressure difference between the ring-blowing inlet and outlet air is 600-800 Pa.

[0031] In high-speed winding molding, the winding speed is 3000-4000 m / min.

[0032] The surface treatment process is as follows: negative charge treatment of the nascent filament surface → deposition of positively charged nanofillers on the surface → heat treatment.

[0033] Negative charge treatment on the surface of nascent filament: Plasma surface treatment is performed on the nascent filament formed by high-speed winding. The treatment gas is a nitrogen-oxygen mixture, in which the volume ratio of nitrogen to oxygen is 100:(50-200), and the treatment time is 40±5s.

[0034] The surface is deposited with positively charged nanofillers as follows: the nascent filaments that have undergone plasma surface treatment are input into a chamber containing toughening and reinforcing particles modified with siloxane coupling agents. The deposition time is 3-6 seconds. The positively charged nanofillers are deposited on the surface of the nascent filaments by electrostatic forces.

[0035] The toughening and reinforcing particles modified with siloxane coupling agent are composed of aminosilane coupling agent and are made up of aspect ratio nanofillers of surface composite latex particles.

[0036] The heat treatment is as follows: The nascent filaments with positively charged nanofillers deposited on their surface are threaded through heating holes in a multi-channel heater for heat treatment. The heat treatment temperature is greater than or equal to the softening temperature of the latex particles, and the residence time of the nascent filaments in the heating holes is 15-30 seconds. The diameter of the heating holes is 1.0-1.05 times the diameter of the nascent filaments.

[0037] Preparation Example 1: The preparation method of nano-toughening and reinforcing particles is as follows: Step 1: Dilute U54 Bayer waterborne polyurethane with deionized water to obtain a primary waterborne polyurethane dispersion with a solid content of 0.8%. Weigh 100g of the primary waterborne polyurethane dispersion, add 0.2g of carrageenan, and mix evenly to obtain the finished waterborne polyurethane dispersion. Add 5g of zinc oxide nanowires (diameter 100-200nm, length 1-10nm, provided by Guangzhou Hongwu Materials Technology Co., Ltd.), heat to 50℃, and magnetically stir at 200rpm for 30min. Place the ultrasonic emulsifying rod in KH540 modified liquid for ultrasonic dispersion treatment at an ultrasonic frequency of 28kHz, a power of 600W, and an ultrasonic treatment time of 15min. After ultrasonic treatment, perform vacuum filtration. During filtration, wash with deionized water until neutral. Place the obtained filter material in a vacuum drying oven and vacuum dry at 100Pa for 6h to obtain modified zinc oxide nanowires with WPU particles on the surface. Step 2: Modify zinc oxide nanowires with aminosilane KH540: Mix 0.5g of KH540 (γ-aminopropyltrimethoxysilane, CAS: 919-30-2) with 95mL of methanol and 5mL of deionized water to obtain a KH540 modification solution. Add 0.1mol / L acetic acid aqueous solution to adjust the pH of the KH540 modification solution to 4.0. Add 3g of modified zinc oxide nanowires with WPU particles on the surface prepared in Step 1. Stir magnetically at 200rpm for 30min at room temperature. Place an ultrasonic emulsifying rod in the KH540 modification solution for ultrasonic dispersion treatment. The ultrasonic frequency is 28kHz, the power is 600W, and the ultrasonic treatment time is 15min. After ultrasonic treatment, perform vacuum filtration. During the filtration process, wash with deionized water until neutral. Place the obtained filter material in a vacuum drying oven and vacuum dry at 100Pa for 6h. After cooling to room temperature with the oven, remove the filter material to obtain nano-toughened and reinforcing particles.

[0038] The difference between Preparation Example 2 and Preparation Example 1 is that the zinc oxide nanowires were replaced with silicon dioxide nanowires DK-SiO2NW-20, which were provided by Zhongke Leiming (Beijing) Technology Co., Ltd.

[0039] Example 1: A method for preparing a full roll of pre-oriented polyester yarn, comprising the following steps: S1, Polyester Chip Drying: Polyester chips (selected from Hengli Petrochemical DJ20678A) are placed in a vacuum drying oven and dried at 95°C under normal pressure for 3 hours. Then, the temperature is raised to 105°C, and the oven pressure is evacuated to 20.0 kPa. Vacuum drying is carried out for 4 hours, and then the oven pressure is evacuated to 5.0 kPa. Vacuum drying is carried out for 8 hours to obtain polyester chips with a moisture content of ≤300 ppm. S2, the dried polyester chips are fed into the screw extruder, where they are melted sequentially through zones one through six to form a polyester melt. The temperatures of zones one, two, three, four, and six of the screw extruder are 275°C, 280°C, 290°C, 295°C, 300°C, and 300°C, respectively. The extrusion die temperature is 299.8°C. The polyester melt is then fed into the spinning box, which is at 290°C. The metering pump delivers 700 g / min. After being extruded through the spinneret, the polyester melt undergoes ring air cooling. The spinneret has a circular perforated structure with 2400 holes. The pressure difference between the inlet and outlet air in the ring air cooling process is 800 Pa. High-speed winding is then performed at a speed of 3300 m / min to obtain nascent yarn. The nascent yarn has a density of 40D, a circular interface, and a diameter of 25 μm. S3, toughening and reinforcing layer deposited on the surface of nascent filaments: S3.1, Negative charge treatment on the surface of the nascent filament, specifically as follows: The nascent filament formed by high-speed winding is input into the plasma surface processor CRF-APO-500W-XN (power 800W, plasma power 10kW / 40KHz) for plasma surface treatment. The treatment gas is ozone, and the treatment speed is 1.2m / min. -OH and -COOH are formed on the surface of the nascent filament, so that the surface of the nascent filament carries a negative charge. S3.2, Surface deposition of positively charged nanofillers, specifically as follows: The nascent filaments that underwent plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles from Preparation Example 1, wherein the content of toughening and reinforcing particles in the chamber is 20.0 g / m³. 3 The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse time is 5s, the single air intake is 0.2‰ of the chamber volume, and the time from input to output is 5s, that is, the deposition time (residual time in the chamber) is 5s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament through electrostatic force. S3.3, heat treatment, specifically as follows: The nascent filaments of the toughening and reinforcing particles prepared in Example 1 by surface deposition in S3.2 are passed through the heating through-hole of a multi-channel heater for heat treatment. The diameter of the heating through-hole is 1.0 times the diameter of the nascent filaments, that is, the diameter of the heating through-hole is 25 μm. The heat treatment temperature is 160℃, and the nascent filaments are kept in the heating through-holes for 25 s, so that a toughening and reinforcing layer can be formed on the surface of the nascent filaments. The nascent yarns with toughening and reinforcing layers formed on the surface obtained from S4 and S3.3 can be bundled, oiled, and wound to obtain full rolls of pre-oriented polyester yarn. The specifications of the pre-oriented polyester yarn are 40D / 72f.

[0040] The difference between Example 2 and Example 1 is as follows: In S3.2, positively charged nanofillers are deposited on the surface, specifically as follows: The nascent filaments that have undergone plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles prepared in Example 2, and the content of toughening and reinforcing particles in the chamber is 20.0 g / m³. 3 The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent the toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse duration is 5s, the single air intake is 0.2‰ of the chamber volume, and the time from input to output is 5s, that is, the deposition time (residual time in the chamber) is 5s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament by electrostatic force. The remaining steps are the same.

[0041] The difference between Example 3 and Example 1 is as follows: In S3.2, positively charged nanofillers are deposited on the surface, specifically as follows: The nascent filaments that have undergone plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles prepared in Example 1, and the content of toughening and reinforcing particles in the chamber is 20.0 g / m³. 3 The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse duration is 5s, the single air intake volume is 0.2‰ of the chamber volume, and the time from input to output is 3s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament by electrostatic force. The remaining steps are the same.

[0042] The difference between Example 4 and Example 1 is as follows: In S3.2, positively charged nanofillers are deposited on the surface, specifically as follows: The nascent filaments that have undergone plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles prepared in Example 1, and the content of toughening and reinforcing particles in the chamber is 20.0 g / m³. 3 The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse duration is 5s, the single air intake volume is 0.2‰ of the chamber volume, and the time from input to output is 4s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament by electrostatic force. The remaining steps are the same.

[0043] The difference between Example 5 and Example 1 is as follows: In S3.2, positively charged nanofillers are deposited on the surface, specifically as follows: The nascent filaments that have undergone plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles prepared in Example 1, and the content of toughening and reinforcing particles in the chamber is 20.0 g / m³. 3 The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse duration is 5s, the single air intake volume is 0.2‰ of the chamber volume, and the time from input to output is 6s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament by electrostatic force. The remaining steps are the same.

[0044] The difference between Example 6 and Example 1 is as follows: S3.3, heat treatment, specifically as follows: the nascent filament of the toughening and reinforcing particles prepared by surface deposition in Example 1 in S3.2 is passed through the heating through hole of a multi-channel heater for heat treatment. The diameter of the heating through hole is 25 μm, the heat treatment temperature is 160℃, and the nascent filament stays in the heating through hole for 15s, thereby forming a toughening and reinforcing layer on the surface of the nascent filament. The remaining steps are the same.

[0045] The difference between Example 7 and Example 1 is as follows: S3.3, heat treatment, specifically as follows: the nascent filament of the toughening and reinforcing particles prepared by surface deposition in Example 1 in S3.2 is passed through the heating through hole of a multi-channel heater for heat treatment. The diameter of the heating through hole is 25 μm, the heat treatment temperature is 160℃, and the nascent filament stays in the heating through hole for 20s, thereby forming a toughening and reinforcing layer on the surface of the nascent filament. The remaining steps are the same.

[0046] The difference between Example 8 and Example 1 is as follows: S3.3, heat treatment, specifically as follows: the nascent filament of the toughening and reinforcing particles prepared by surface deposition in Example 1 in S3.2 is passed through the heating through hole of a multi-channel heater for heat treatment. The diameter of the heating through hole is 25 μm, the heat treatment temperature is 160℃, and the nascent filament stays in the heating through hole for 30s, thereby forming a toughening and reinforcing layer on the surface of the nascent filament. The remaining steps are the same.

[0047] The difference between Comparative Example 1 and Example 1 lies in the method for preparing the polyester pre-oriented yarn, which includes the following steps: S1, Polyester Chip Drying: Polyester chips (selected from Hengli Petrochemical DJ20678A) are placed in a vacuum drying oven and dried at 95°C under normal pressure for 3 hours. Then, the temperature is raised to 105°C, and the oven pressure is evacuated to 20.0 kPa. Vacuum drying is carried out for 4 hours, and then the oven pressure is evacuated to 5.0 kPa. Vacuum drying is carried out for 8 hours to obtain polyester chips with a moisture content of ≤300 ppm. S2, the dried polyester chips are fed into the screw extruder, where they are melted sequentially through zones one through six to form a polyester melt. The temperatures of zones one, two, three, four, and six of the screw extruder are 275°C, 280°C, 290°C, 295°C, 300°C, and 300°C, respectively. The extrusion die temperature is 299.8°C. The polyester melt is then fed into the spinning box, which is at 290°C. The metering pump delivers 700 g / min. After being extruded through the spinneret, the polyester melt undergoes ring air cooling. The spinneret has a circular perforated structure with 2400 holes. The pressure difference between the inlet and outlet air in the ring air cooling process is 800 Pa. High-speed winding is then performed at a speed of 3300 m / min to obtain nascent yarn. The nascent yarn has a density of 40D, a circular interface, and a diameter of 25 μm. The nascent yarns obtained from S4 and S2 can be bundled, oiled, and wound to obtain full rolls of pre-oriented polyester yarn.

[0048] The difference between Comparative Example 2 and Example 1 is as follows: In S3.2, positively charged nanofillers are deposited on the surface, specifically as follows: The nascent filaments that have undergone plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles from Example 1, and the content of toughening and reinforcing particles in the chamber is 20.0 g / m³. 3The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse duration is 5s, the single air intake volume is 0.2‰ of the chamber volume, and the time from input to output is 2s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament by electrostatic force. The remaining steps are the same.

[0049] The difference between Comparative Example 3 and Example 1 is as follows: In S3.2, positively charged nanofillers are deposited on the surface, specifically as follows: The nascent filaments that have undergone plasma surface treatment in S3.1 are input into a chamber containing an atmosphere of nano-toughening and reinforcing particles from Example 1, wherein the content of toughening and reinforcing particles in the chamber is 20.0 g / m 3 The chamber is made of stainless steel and is connected to a grounding wire to eliminate static electricity, which can prevent toughening and reinforcing particles from depositing inside the chamber. Pulsed compressed air is injected into the chamber to make the toughening and reinforcing particles evenly distributed inside the chamber. The pulse duration is 5s, the single air intake volume is 0.2‰ of the chamber volume, and the time from input to output is 8s. The toughening and reinforcing particles of Preparation Example 1 are deposited on the surface of the nascent filament by electrostatic force. The remaining steps are the same.

[0050] The difference between Comparative Example 4 and Example 1 is as follows: S3.3, heat treatment, specifically as follows: the nascent filaments of the toughening and reinforcing particles prepared by surface deposition in Example 1 in S3.2 are passed through the heating through-hole of a multi-channel heater for heat treatment. The diameter of the heating through-hole is 25 μm, the heat treatment temperature is 160°C, and the nascent filaments stay in the heating through-holes for 10 s, thereby forming a toughening and reinforcing layer on the surface of the nascent filaments. The remaining steps are the same.

[0051] The difference between Comparative Example 5 and Example 1 is as follows: S3.3, heat treatment, specifically as follows: the nascent filaments of the toughening and reinforcing particles prepared by surface deposition in Example 1 in S3.2 are passed through the heating through-hole of a multi-channel heater for heat treatment. The diameter of the heating through-hole is 25 μm, the heat treatment temperature is 160°C, and the nascent filaments stay in the heating through-holes for 35 s, thereby forming a toughening and reinforcing layer on the surface of the nascent filaments. The remaining steps are the same.

[0052] The difference between Comparative Example 6 and Example 1 is as follows: S3.3, heat treatment, specifically as follows: the nascent filaments of the toughening and reinforcing particles prepared by surface deposition in Example 1 in S3.2 are passed through the heating through-hole of a multi-channel heater for heat treatment. The diameter of the heating through-hole is 25 μm, the heat treatment temperature is 120°C, and the nascent filaments stay in the heating through-holes for 25 s, thereby forming a toughening and reinforcing layer on the surface of the nascent filaments. The remaining steps are the same.

[0053] Table 1: Test parameters of polyester pre-oriented yarns in Examples 1-8 and Comparative Examples 1-6

[0054] The breaking strength and elongation at break were determined in accordance with GB / T 14344-2022.

[0055] The coefficient of variation of linear density was determined according to GB / T 14343-2008.

[0056] As can be seen from Example 1 and Comparative Example 1, and Table 1, the surface treatment process can improve the breaking strength of the fully rolled polyester pre-oriented yarn, thereby reducing its breakage rate during the stretching and deformation process.

[0057] As can be seen from Examples 1 and 2 and Table 1, under the same surface treatment process, the polyester pre-oriented yarn prepared by zinc oxide nanowires has better breaking strength. Zinc oxide nanowires can improve the breaking strength of polyester pre-oriented yarns and also give them good antibacterial and anti-ultraviolet aging properties.

[0058] Based on Examples 1, 3-5, and Comparative Examples 2-3, and in conjunction with Table 1, it can be seen that the deposition time of the toughening and reinforcing particles in S3.2 should be controlled to be 3-6 seconds. If the deposition time is too short, the toughening and reinforcing layer formed will be too thin, and the effect on improving the breaking strength of the polyester pre-oriented yarn will be small, failing to reduce the breakage rate of the polyester pre-oriented yarn during the stretching and deformation process. On the other hand, if the deposition time is too long, the improvement on the breaking strength of the polyester pre-oriented yarn will not be obvious, and the problem of "powder shedding" is likely to occur, affecting the subsequent oiling process.

[0059] Based on Examples 1, 6-8, and Comparative Examples 4-5, and referring to Table 1, it can be seen that a heat treatment time of 15-30 seconds at 160°C in S3.3 is preferable, as it effectively improves the breaking strength, elongation at break, and dimensional stability of the polyester pre-oriented yarn. However, if the heat treatment time is too short, the thermal fusion between the polyurethane latex particles is insufficient, resulting in poor mechanical properties of the formed toughening and reinforcing layer. Consequently, the improvement in the breaking strength of the polyester pre-oriented yarn is minimal, and it fails to reduce the breakage rate of the polyester pre-oriented yarn during stretching and deformation. Conversely, if the heat treatment time is too long, unnecessary thermo-oxidative aging and decreased crystallinity will occur, significantly affecting the mechanical properties of the polyester pre-oriented yarn. Therefore, a heat treatment time of 20-25 seconds at 160°C in S3.3 is preferable.

[0060] Based on Example 1 and Comparative Example 6, and referring to Table 1, it can be seen that the tensile strength, elongation at break, and dimensional stability of the polyester pre-oriented yarn prepared after heat treatment at 120℃ for 25s are significantly reduced. This is mainly due to insufficient thermal fusion between polyurethane latex particles, resulting in poor mechanical properties of the toughened reinforcing layer. In contrast, the tensile strength, elongation at break, and dimensional stability of the polyester pre-oriented yarn prepared after heat treatment at 160℃ for 25s are all excellent. Therefore, the heat treatment temperature in S3.3 should be controlled at 160±5℃.

[0061] In summary, by performing surface treatment on the nascent yarn, the breaking strength of the nascent yarn and the breaking strength of the fully bundled polyester pre-oriented yarn can be improved, the breakage rate of the polyester pre-oriented yarn during the stretching and texturing process can be reduced, the production efficiency of stretching and texturing yarn can be improved, and the production cost of stretching and texturing yarn can be optimized.

[0062] It should be noted that this specific embodiment is merely an explanation of the technical solution of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A full package of polyester pre-oriented yarn, characterized in that: The full package of polyester pre-oriented yarn is formed by the deposition of toughening reinforcing layer on the surface of monofilament, and the toughening reinforcing layer is made of long-diameter ratio nano filler and latex particle.

2. A full package polyester pre-oriented yarn according to claim 1, characterized in that: The long-diameter ratio nano filler includes at least one of zinc oxide nanowire, titanium dioxide nanowire, silicon dioxide nanowire, silver nanowire, PANI nanowire, silicon carbide nanowire and single-walled carbon nanotube.

3. A full package polyester pre-oriented yarn as claimed in claim 1, wherein: The latex particle is at least one of polyurethane latex particle and epoxy latex particle with particle size less than 100 nm.

4. A process for the production of a full package of polyester pre-oriented yarn according to any one of claims 1 to 3, characterized in that: The long-diameter ratio nano filler is zinc oxide nanowire with diameter of 5-200 nm, length of 0.15-20 μm and long-diameter ratio greater than 20; the latex particle is provided by aqueous polyurethane dispersion, and the particle size of polyurethane latex particle is less than 100 nm.

5. A process for the production of a full package of polyester pre-oriented yarn according to claim 4, characterized in that: The preparation method of the full package of polyester pre-oriented yarn is as follows: polyester chip drying, melt extrusion, polyester melt conveying, spinning box, metering pump, spinneret extrusion, circular blowing air cooling, high-speed winding forming, surface treatment, and full package of polyester pre-oriented yarn is obtained by bundling, and the process flow of the surface treatment is as follows: primary filament surface negative charge treatment, surface deposition of positively charged nano filler, and heat treatment.

6. A process for the production of a full package of polyester pre-oriented yarn according to claim 5, characterized in that: The primary filament surface negative charge treatment in the surface treatment process is as follows: the primary filament formed by high-speed winding forming is subjected to plasma surface treatment, and the treatment gas is ozone.

7. A process for the production of a full package of polyester pre-oriented yarn according to claim 6, characterized in that: The surface deposition of positively charged nano filler in the surface treatment process is as follows: the primary filament subjected to plasma surface treatment is input into a chamber containing toughening reinforcing particle modified by siloxane coupling agent, the deposition time is 3-6 s, and the surface deposition of positively charged nano filler is deposited on the surface of the primary filament by electrostatic force.

8. A process for the production of a full package of polyester pre-oriented yarn according to claim 6, characterized in that: The siloxane coupling agent in the toughening reinforcing particle modified by siloxane coupling agent is amino silane, and the toughening reinforcing particle is composed of long-diameter ratio nano filler of surface composite latex particle.

9. A process for the production of a full package of polyester pre-oriented yarn according to claim 4, characterized in that: The heat treatment in the surface treatment process is as follows: the primary filament with surface deposition of positively charged nano filler is subjected to heat treatment by passing through the heating through hole of multi-channel heater, the heat treatment temperature is greater than or equal to the softening temperature of the latex particle, the residence time of the primary filament in the heating through hole is 15-30 s, and the diameter of the heating through hole is 1.0-1.05 times the diameter of the primary filament.

10. A process for the production of a full package of polyester pre-oriented yarn as claimed in claim 4, wherein: In the polyester chip drying process, the moisture of the dried polyester chip is less than 300 ppm; in the melt extrusion process, the dried polyester chip is input into a screw extruder, and the polyester melt is formed by sequentially passing through zones 1 to 6 in the screw extruder, and the temperature range of zones 1 to 6 is 275-300 ℃. The temperature of the spinning box is 280-300 ℃, the pump supply of the metering pump is 700-800 g / min, the pressure difference between the inlet air and return air in the circular blowing air cooling process is 600-800 Pa, and the winding speed in the high-speed winding forming is 3000-4000 m / min.

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