Method for processing colored porous nylon parent yarn

Abstract

The application discloses a colored porous nylon precursor processing method, which comprises the following steps: taking nylon 6 chips as a base body, compounding special color master batches, light-resistant agents, inorganic dispersion stabilizers and porous forming additives, feeding under nitrogen protection and drying, six-section segmental melting homogenization, constant-temperature transportation of biphenyl, porous spinning forming, gradient side-blowing cooling, double-oil-nozzle low-tension uniform oiling, pre-networking and precise winding, and stable switching forming, so that colored porous nylon precursors are prepared. The application effectively solves the technical problems of uneven coloring, poor light aging resistance, easy generation of broken ends during the spinning process, unstable pore distribution, color difference and broken yarn during the post-elasticity adding and the like of traditional colored porous nylon, and the prepared colored porous nylon precursors have the advantages of uniform and consistent pore number, full coloring without color difference, excellent light resistance and aging resistance, high strength retention rate, stable spinning forming, strong post-processing adaptability and the like.

Description

Technical Field

[0001] This invention relates to the field of textile and chemical fiber production technology, specifically to a method for processing colored porous nylon masterfilament, which is particularly suitable for the industrial production of high-quality, high-light-resistance, and high-uniform colored porous nylon 6 masterfilament. Background Technology

[0002] Nylon fiber is one of the most produced and widely used synthetic fibers. With its excellent abrasion resistance, tensile strength, resilience, and hand comfort, it is widely used in clothing fabrics, home textiles, and industrial textiles. With the upgrading of consumption and the development of high-end fabrics, porous nylon masterfilament and colored nylon filament have become key development directions in the industry. The porous structure significantly improves the fiber's bulkiness, breathability, skin-friendliness, and coverage, making the fabric lighter and softer. Colored nylon filament can be directly dyed during the spinning stage, eliminating the need for subsequent dyeing processes, reducing water consumption and pollutant emissions, while avoiding color differences and uneven coloring problems that occur during the dyeing process, thus improving product consistency.

[0003] However, existing colored porous nylon yarn production technology still has many insurmountable drawbacks: 1. Insufficient light resistance: Under long-term light and sun exposure, the macromolecular chains of ordinary colored nylon yarn are prone to breakage and degradation, leading to decreased fiber strength, color fading, and fabric aging and embrittlement. 2. Poor stability in porous forming: During high-speed spinning, phenomena such as fuzzing, breakage, spun yarn, yarn clumping, and missing pores are prone to occur, making it difficult to guarantee the uniformity of pore count, which seriously affects production efficiency and finished product qualification rate. 3. Poor dispersibility of masterbatch and inorganic auxiliaries: Local agglomeration is prone to occur, resulting in uneven fiber evenness, cross-sectional differences, and dyeing color differences, affecting appearance and performance. 4. Coarse control of cooling and oiling processes: Large fluctuations in yarn tension, making it easy to break yarns and fail to properly connect end yarns during subsequent texturing processing, reducing processing efficiency. 5. Existing technologies mostly focus on improving light resistance or porous structure, failing to integrate properties such as color, porosity, light resistance, high spinning stability, and post-processing friendliness, making it difficult to meet the comprehensive fiber quality requirements of high-end fabrics. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and provide a method for processing colored porous nylon master yarn. Through optimized compounding of raw materials and precise control of the entire process, a comprehensive effect of uniform fiber coloring, stable porous structure, excellent light resistance, and smooth spinning is achieved, thereby improving product quality and industrial production stability.

[0005] This invention is achieved through the following technical solution: Raw material composition: This invention uses a matrix slice and multifunctional auxiliary agent compound system, and the components are proportioned by weight as follows: Nylon 6 chips: 85-100 parts; color masterbatch: 3-9 parts; composite lightfastness agent: 1.5-4.5 parts; inorganic dispersion stabilizer: 1-3.5 parts; porous forming aid: 0.5-1.2 parts.

[0006] The composite lightfastener is composed of white bamboo charcoal powder, poplar powder, and grape seed extract in a weight ratio of 1:1-3:0.2-0.6; the inorganic dispersion stabilizer is composed of zirconium oxide, sericite, and titanium dioxide in a weight ratio of 1:1-2:0.5-0.9; and the porous forming aid is composed of glass fiber, nano-calcium carbonate, and polyethylene wax in a weight ratio of 1:0.8-1.2:0.4-0.9.

[0007] A method for processing colored porous nylon master yarn includes the following steps: (1) Nitrogen-protected feeding: Nylon 6 chips are fed into a sealed silo, and low-humidity nitrogen with a purity of ≥99.99% is introduced for sealing protection, and the moisture content in the silo is controlled to be ≤400PPM, and the raw material residence time is ≤24h; (2) Segmented melting: A six-zone temperature-controlled screw extruder is used for melting, with zone 1 at 248-252℃, zone 2 at 256-260℃, zone 3 at 261-265℃, zone 4 at 264-268℃, zone 5 at 264-268℃, and zone 6 at 263-267℃; the screw outlet pressure is ≥100kg, the melt pressure is uniform in each channel, and the pressure before the metering pump is ≥55kg; (3) Light-resistant coloring blending: Nylon melt is blended online with color masterbatch, composite light-resistant agent, inorganic dispersing stabilizer and porous molding aid, and homogenized by static mixer to obtain uniformly colored spinning melt; (4) Constant temperature conveying of melt: Biphenyl steam is used for heat preservation, with a temperature of 245-270℃, a steam pressure of 0.5-1.0kg, and a melt residence time of 5-7min; (5) Multi-hole spinning: A multi-hole spinneret is used with a hole diameter of 0.12-0.35 mm, an aspect ratio of 2.5-3.8, a spinning pressure of 120-220 kPa, and a spinning speed of 4000-4600 m / min; (6) Monomer extraction: Water jet pumps extract air at a speed of 6-14 m / s to remove low molecular weight monomers; (7) Gradient cooling and shaping: side blowing temperature 16-19℃, humidity 88-96%, wind speed 0.32-0.60m / s, oil rack height 800-1300mm; cooling adopts gradient wind speed, upper section 0.45-0.60m / s, lower section 0.32-0.45m / s; (8) Low tension oiling: oiling with double oil nozzles, oil concentration 6-11%, oiling rate 0.4-1.1%; the oil is a compound of isooctyl stearate, moringa seed oil, fatty alcohol polyoxyethylene ether, and artemisia annua powder in a ratio of 60-75:5-11:1-3.5:1-2.5. (9) Pre-network and winding: Pre-network pressure 0.6-2.1 kPa; winding angle 5-7°, contact pressure 180-230 N, overfeed 0-0.6%; (10) Switching to molding: switch to overfeed 1-3%, residence time 1-5s, tail wire residence 0.2-1.6s.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Uniform coloring with no color difference: The masterbatch and additives are highly dispersed, resulting in consistent coloring throughout the fabric, without streaks, spots, or color differences between inner and outer layers; 2. Excellent light and aging resistance: The composite light-resistant system works synergistically, with high UV shielding and absorption efficiency, making it resistant to fading and embrittlement over long-term use; 3. Highly stable porous molding: The number of pores is precisely controllable, with no missing pores, tangled fibers, or fuzz, significantly reducing the spinning breakage rate; 4. High production efficiency: Stable continuous spinning, long scraping cycle, and high finished product qualification rate, suitable for large-scale industrial production; 5. Strong adaptability to post-processing: Smooth texturing, normal tail yarn splicing, soft hand feel, fluffy and breathable fabric, and excellent appearance. Attached Figure Description

[0009] Figure 1 This is a flowchart illustrating the process flow of the colored porous nylon masterbatch processing method of the present invention. Detailed Implementation

[0010] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments. Example

[0011] refer to Figure 1 A method for processing colored porous nylon masterbatch, the specific steps of which are as follows: (1) Nitrogen-protected feeding Nylon 6 chips are fed into a sealed silo and sealed with low-humidity nitrogen gas with a purity of ≥99.99% to control the moisture content in the silo to ≤350PPM. The raw material stays in the silo for 18 hours.

[0012] (2) Segmented melting A six-zone temperature-controlled screw extruder is used for melting, with zone 1 temperature at 250℃, zone 2 temperature at 258℃, zone 3 temperature at 263℃, zone 4 temperature at 266℃, zone 5 temperature at 266℃, and zone 6 temperature at 265℃; the screw extruder outlet pressure is controlled at ≥100kg, the pressure of each melt channel is uniform, and the melt pressure before the metering pump is ≥55kg.

[0013] (3) Lightfast coloring blend The following components are formulated by weight: 90 parts nylon 6 chips, 5 parts color masterbatch, 2.5 parts composite lightfastness agent, 2 parts inorganic dispersion stabilizer, and 0.8 parts porous forming aid; wherein the composite lightfastness agent is white bamboo charcoal powder: poplar powder: grape seed extract = 1:2:0.4; the inorganic dispersion stabilizer is zirconium oxide: sericite: titanium dioxide = 1:1.5:0.7; and the porous forming aid is glass fiber: nano calcium carbonate: polyethylene wax = 1:1:0.6. The above components are blended online and thoroughly homogenized using a static mixer.

[0014] (4) Constant temperature conveying of melt The insulation was achieved using biphenyl steam at a temperature of 255℃ and a steam pressure of 0.7kg, with the melt remaining in the pipe for 6 minutes.

[0015] (5) Porous spinning forming A 72-hole spinneret with a hole diameter of 0.20 mm and an aspect ratio of 3.2 was selected. The spinning starting pressure was 160 kPa and the spinning speed was 4300 m / min.

[0016] (6) Single-unit suction A water jet pump is used for suction, with the suction speed controlled at 10m / s, to remove low molecular weight monomers.

[0017] (7) Gradient cooling and shaping The side-blowing temperature is 17.5℃ and the humidity is 92%; a gradient wind speed is adopted, with the upper section wind speed being 0.50m / s and the lower section wind speed being 0.38m / s; the oil rack height is 1000mm.

[0018] (8) Low-tension oiling The oil is applied using a dual-nozzle system with an oil concentration of 8% and an oil application rate of 0.7%. The oil formulation is isooctyl stearate: Moringa seed oil: fatty alcohol polyoxyethylene ether: Artemisia annua powder = 68:8:2:1.5.

[0019] (9) Pre-network and winding Pre-network pressure 1.2 kPa; winding angle 6°, contact pressure 200 N, overfeed rate 0.3%.

[0020] (10) Switching to molding Switch to overfeed 2%, dwell time 3s, tail thread dwell time 1s.

[0021] The colored porous nylon master yarn produced by this invention has a uniform number of holes, with no missing holes or tangled yarns; the coloring is full and uniform, with no color difference or spots; there are few broken ends and few fuzzy fibers during the spinning process, resulting in good production continuity; the subsequent texturing process is smooth, and the tail yarn can be spliced ​​normally; the fabric surface has a soft feel and uniform luster.

[0022] Furthermore, it should be noted that any equivalent or simple changes made to the structure, features, and principles based on the concept of this invention are included within the scope of protection of this invention.

Claims

1. A method for processing colored porous nylon masterbatch, characterized in that, Includes the following steps: (1) Nitrogen protection feeding: Nylon 6 chips are fed into a sealed silo and sealed with low-humidity nitrogen gas with a purity of ≥99.99%. The moisture content in the silo is controlled to be ≤400PPM and the raw material stays in the silo for ≤24h. (2) Segmented melting: A six-zone temperature-controlled screw extruder is used for melting. The temperature of zone 1 is 248-252℃, zone 2 is 256-260℃, zone 3 is 261-265℃, zone 4 is 264-268℃, zone 5 is 264-268℃, and zone 6 is 263-267℃. The outlet pressure of the screw extruder is controlled to be ≥100kg, the pressure of each melt channel is kept uniform, and the melt pressure before the metering pump is ≥55kg. (3) Light-resistant coloring blending: The molten nylon melt is blended online with color masterbatch, composite light-resistant agent, inorganic dispersing stabilizer and porous molding aid, and fully homogenized by static mixer to form a uniform and stable colored spinning melt; (4) Constant temperature transport of melt: Biphenyl vapor is used to keep the melt pipeline warm at a temperature of 245-270℃ and a pressure of 0.5-1.0 kg. The residence time of the melt in the pipeline is controlled to be 5-7 min. (5) Multi-hole spinning: Multi-hole spinneret is used for spinning. The spinneret hole diameter is 0.12-0.35mm, the length-to-diameter ratio is 2.5-3.8, the spinning starting pressure is 120-220kPa, and the spinning speed is 4000-4600m / min. (6) Monomer suction: A water jet pump is used to suction the monomers, and the suction speed is controlled at 6-14 m / s to remove low molecular weight monomers generated during the spinning process. (7) Gradient cooling and shaping: side blowing is used for cooling, the cooling temperature is 16-19℃, the ambient humidity is 88-96%, the cooling wind speed is 0.32-0.60m / s, and the oil rack height is set to 800-1300mm; (8) Low-tension oiling: Use double oil nozzles for oiling, with an oil concentration of 6-11%, and control the oiling rate of the yarn to 0.4-1.1%; (9) Pre-networking and winding: The filament is treated by a pre-networking device with a pre-networking pressure of 0.6-2.1 kPa; winding angle of 5-7°, contact pressure of 180-230 N, and overfeed rate of 0-0.6%; (10) Switching to molding: When switching, control the overfeed by 1-3%, the residence time by 1-5s, and the tail wire residence time by 0.2-1.6s.

2. The method for processing colored porous nylon masterbatch according to claim 1, characterized in that, The raw materials in step (3) are as follows by weight: 85-100 parts of nylon 6 chips, 3-9 parts of color masterbatch, 1.5-4.5 parts of composite lightfastness agent, 1-3.5 parts of inorganic dispersion stabilizer, and 0.5-1.2 parts of porous molding aid.

3. The method for processing colored porous nylon masterbatch according to claim 2, characterized in that, The composite lightfastener is composed of white bamboo charcoal powder, poplar powder, and grape seed extract in a weight ratio of 1:1-3:0.2-0.

6.

4. The method for processing colored porous nylon masterbatch according to claim 2, characterized in that, The inorganic dispersing stabilizer is composed of zirconium oxide, sericite, and titanium dioxide in a weight ratio of 1:1-2:0.5-0.

9.

5. The method for processing colored porous nylon masterbatch according to claim 2, characterized in that, The porous molding aid is composed of glass fiber, nano-calcium carbonate, and polyethylene wax in a weight ratio of 1:0.8-1.2:0.4-0.

9.

6. The method for processing colored porous nylon masterbatch according to claim 1, characterized in that, Step (7) Cooling is achieved by gradient wind speed control, with the wind speed in the upper section of spinning being 0.45-0.60 m / s and the wind speed in the lower section of spinning being 0.32-0.45 m / s.

7. The method for processing colored porous nylon masterbatch according to claim 1, characterized in that, The oil preparation in step (8) is composed of isooctyl stearate, moringa seed oil, fatty alcohol polyoxyethylene ether, and artemisia annua powder in a weight ratio of 60-75:5-11:1-3.5:1-2.

5.

8. A colored porous nylon mother yarn, characterized in that, It is prepared by the processing method according to any one of claims 1-7.

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