Composite antistatic nylon / spandex air coated yarn

Abstract

The invention relates to the technical field of air coated yarns, in particular to a composite antistatic nylon / spandex air coated yarn which is prepared by the following steps: adding 96-98.5% of nylon chips and 1.5-4.0% of an antistatic agent into an extruder according to the proportion, controlling the melting temperature to be 245-265 DEG C, stabilizing the melt flow index to be 0.615-0.67 dl / g, and ensuring the spinning melt uniformity; a cross air blowing cooling system is adopted, cooling parameters are adjusted, the air temperature ranges from 7 DEG C to 10 DEG C, the humidity ranges from 86% to 91%, the air speed ranges from 0.8 m / s to 0.86 m / s, spandex POY and chinlon POY are compounded in an elasticizer to prepare the chinlon-spandex air coated yarn, and the elasticizing technology is adjusted as follows: the draw ratio ranges from 1.45 to 1.65, the temperature of a hot box ranges from 180 DEG C to 210 DEG C, and the false twisting tension ranges from 0.25 cN / dtex to 0.35 cN / dtex; an antistatic oil agent is added into the oiling system, so that the antistatic oil agent is uniformly attached to the surface of the composite antistatic nylon-spandex air-coated yarn, a better antistatic effect is achieved, and finally the composite antistatic nylon-spandex air-coated yarn is obtained. The air coated yarn has better antistatic property and durability.

Description

Technical Field

[0001] The invention relates to the technical field of air-coated yarns, in particular to a composite antistatic nylon-spandex air-coated yarn. Background Art

[0002] As the second largest synthetic fiber product in the textile field after polyester, nylon has seen increasing demand in recent years, with production capacity increasing year by year. It is also developing rapidly in the direction of fine denier, high speed, differentiation, and functionality. New varieties and new technologies are emerging in an endless stream, and new processes and equipment are being used, as well as the strengthening of ecological and environmental awareness.

[0003] Nylon-spandex air-encased yarn is an improvement on nylon products. It is a specialty yarn made by combining nylon and spandex through air texturing technology. The core process uses high-speed airflow to bulk up the nylon filaments while simultaneously wrapping the spandex (which provides high elasticity) around the outer layer or core, creating a functional fiber material that combines elasticity, softness, and bulk.

[0004] Functional development and research are carried out on nylon yarns used in human body close-fitting fabrics. With the continuous growth of people's consumption needs, people not only require beauty, durability and comfort, but also need to achieve a healthier standard of living. The research and development of functional composite anti-static nylon-spandex air-coated yarns is growing in application and is widely used in underwear, socks, sportswear, children's clothing, medical fabrics and other fields.

[0005] The existing nylon-spandex coated yarn production technology has the following defects: insufficient antistatic performance and poor durability; uneven adhesion of oil leads to poor spinnability; the antistatic effect in composite spinning technology cannot be synergistically enhanced; low matching of process parameters affects product stability.

[0006] Therefore, based on the current shortcomings of air-covered yarn, our company focuses on improving the antistatic properties of air-covered yarn to meet the needs of the market. Summary of the Invention

[0007] The purpose of the present invention is to provide a composite antistatic nylon-spandex air-coated yarn to address the shortcomings of the current antistatic nylon-spandex air-coated yarn.

[0008] Specifically, the present invention adopts the following technical solutions: A composite antistatic nylon-ammonia air-coated yarn is prepared by the following steps: Step 1: Raw material ratio and melt extrusion: Use a precision weight feeder to add 96% to 98.5% of nylon chips and 1.5% to 4.0% of antistatic agent to the extruder in proportion. Control the melt temperature at 245 to 265°C and stabilize the melt flow index at 0.615 to 0.67 dl / g to ensure the uniformity of the spinning melt. Step 2: Optimize the pre-spinning process, use the side-blowing cooling system, and adjust the cooling parameters: air temperature 7-10℃, humidity 86-91%, and wind speed 0.8-0.86m / s. Step 3: POY physical index test and texturing process adaptation, spandex POY and nylon POY are compounded in a texturing machine to prepare nylon-spandex air-coated yarn. Based on the test results, the texturing process is adjusted to: draw ratio 1.45-1.65, hot box temperature 180-210°C, false twist tension 0.25-0.35 cN / dtex; Step 4: Add antistatic oil to the nylon-ammonia air-coated yarn in step 3 using an oiling system, so that it is evenly attached to the surface of the composite antistatic nylon-ammonia air-coated yarn to achieve a better antistatic effect, and finally obtain the composite antistatic nylon-ammonia air-coated yarn.

[0009] Further preferably, the antistatic agent in step 1 is composed of the following components by weight percentage: 30-50% of liquid ion conductive polymer, 10-20% of modified nano zinc oxide / carbon nanotube hybrid material, 15-25% of hyperbranched dendritic polymer polyamide amine, 5-10% of siloxane coupling agent, and the balance of functional additives.

[0010] Liquid ion-conductive polymers have both high conductivity and fiber affinity, avoiding the poor mobility problem of traditional ionic liquids.

[0011] The photocatalytic activity of zinc oxide in the modified nano-zinc oxide / carbon nanotube hybrid material can decompose surface pollutants and maintain antistatic properties. CNTs provide a conductive network and synergistically reduce the surface resistivity (<10 8 Ω / sq).

[0012] The porous structure of dendritic molecules adsorbs ionic liquids, achieving a sustained release effect and improving washability (resistivity retention rate >85% after 50 washes).

[0013] Siloxane coupling agent is a siloxane containing epoxy groups (such as GPTMS), which forms a cross-linked film on the fiber surface to fix the antistatic components; it reacts with the amino groups at the end of nylon through in-situ polymerization to enhance the interfacial bonding force.

[0014] Further preferably, the liquid ion conductive polymer is a bifunctional ionic liquid, and the preparation steps are as follows: First, prepare the phosphate-functionalized imidazolium ionic liquid: add 10 mmol of 1-ethyl-3-methylimidazolium chloride and 50 mL of anhydrous acetonitrile into a dry three-necked flask, stir and dissolve, then add 15 mmol of triethyl phosphate and 1 mmol of potassium iodide, under nitrogen protection, heat to 80°C, and reflux for 12 hours; after the reaction, cool to room temperature, and remove acetonitrile by vacuum distillation; dissolve the crude product in dichloromethane, wash with water three times to remove unreacted triethyl phosphate and KI, and dry the organic phase with anhydrous sodium sulfate. The solvent was removed by rotary evaporation to obtain a white solid of 1-ethyl-3-methylimidazole diethyl phosphate; Second, 10 mmol of the above-mentioned phosphate product was dissolved in 30 mL of acetonitrile, 12 mmol of 1,3-propane sultone was added, and the reaction was stirred at 60°C for 8 hours. Then, 12 mmol of triethylamine was added to neutralize the acidic by-products generated by the reaction. The precipitate was filtered to remove the solvent, and the filtrate was distilled under reduced pressure to remove the solvent. The residue was extracted with an ethyl acetate / water mixture, and the organic phase was separated and further purified by silica gel column chromatography (eluent: methanol / dichloromethane = 1:10) to obtain a liquid ion conductive polymer with dual functionalization.

[0015] The liquid ion-conductive polymer of the present invention combines high conductivity with fiber affinity, avoiding the poor mobility problem of traditional ionic liquids. The introduction of phosphate groups improves ester bond compatibility with nylon, while sulfonic acid groups enhance ion dissociation ability.

[0016] Further preferably, the modified nano zinc oxide / carbon nanotube hybrid material is prepared by dispersing nano zinc oxide in ethanol, adding acidified CNTs, and forming a ZnO@CNT core-shell structure by electrostatic self-assembly; the specific steps are as follows: Step 1: Preparation of CNT dispersion: 50 mg of acidified CNTs were added to 100 mL of a 1:1 ethanol / water mixture, along with 0.1 wt% of a surfactant, and ultrasonicated for at least 1 hour to form a uniform dispersion. Step 2: Sol preparation, Zinc precursor solution: Dissolve 10 mmol of Zn(NO3)2·6H2O in 50 mL of ethanol and stir for 30 minutes. Add the CNT dispersion dropwise to the zinc precursor solution and stir magnetically at 40°C for 2 hours. Add 10 mmol of urea as a hydrolysis catalyst and adjust the pH to 8-9. Step 3: Gelation and aging: heating to 80°C and stirring continuously for 6-12 hours, the sol gradually transforms into gel, aging treatment, and letting the gel stand for 24 hours to enhance the cross-linking of the ZnO precursor on the CNT surface; Step 4: Drying and calcination: Drying: vacuum drying at 60°C for 12 hours to obtain a CNT / ZnO precursor complex; Calcination: calcining at 350-450°C in a tube furnace for 2 hours to crystallize ZnO and form a CNT@ZnO core-shell structure.

[0017] More preferably, the functional additives are hindered phenol antioxidants, benzotriazole ultraviolet absorbers and pH adjuster sodium citrate.

[0018] Further preferably, the antistatic oil agent is composed of the following components by weight: base oil 75-85%, antistatic functional system 12-20%, emulsifying dispersion system 8-12%, functional additives 3-5%; Among them, the base oil is white oil with a kinematic viscosity of 12.0-16.0 mm² / s; The antistatic functional system includes 5-10% nitrogen-sulfur doped MXene composite antistatic agent, 3-8% hydrotalcite, and 4-6% conductive filler; Functional additives include 2-4% of a sizing agent selected from sodium carboxymethyl cellulose, 0.5-1% of a hindered phenol antioxidant and 0.1-0.3% of a silicone defoaming agent.

[0019] The base oil is used to provide excellent lubricity and stability. Nitrogen-sulfur doped MXene composite antistatic agent, by combining sulfur-doped MXene with dodecyl phosphate, improves the conductivity (surface resistance ≤ 1.5×10 8 Ω) and enhance compatibility with other components of the oil. The layered composite hydrotalcite forms a cross-entangled film on the surface of the nylon fiber, improving antistatic durability. The conductive filler uses nano-scale carbon black or graphene to enhance the conductive network structure.

[0020] Sizing agents are used to improve fiber cohesion, antioxidants prevent oils from oxidizing and deteriorating, and defoaming agents are used to reduce foam interference during the production process.

[0021] Further preferably, the antistatic oil agent is prepared by the following method: Pretreatment: Calcine the MXene material at 500-750°C in a H2S / Ar atmosphere to prepare sulfur-doped MXene, and then hydrothermally react with hexamethylenetetramine to generate nitrogen-sulfur-doped MXene. Synthesis of the antistatic functional system: Nitrogen-sulfur doped MXene and dodecyl phosphate are mixed in a mass ratio of 1:3-5, and subjected to dual-frequency ultrasonic treatment at an alternating frequency of 35-135 kHz for 1-3 hours to form a uniformly dispersed antistatic composite liquid; Oil preparation: Heat the base oil to 60°C, add the composite hydrotalcite, conductive filler, and antistatic composite liquid in sequence, and stir at a high speed of more than 2000r / min for 30 minutes; add the emulsifying dispersant, sizing agent, and antioxidant, and stir at a medium speed of less than 800r / min for 1 hour; finally, add the defoaming agent, degas in vacuum, and cool to room temperature to obtain the finished oil.

[0022] Compared with the prior art, the present invention has the following beneficial effects: The combination of a bifunctional ionic liquid, a ZnO@CNT hybrid material, and a hyperbranched PAMAM achieves synergistic breakthroughs in conductivity, durability, and dispersibility, far exceeding the effects of each individual component. The ZnO@CNT core-shell structure prevents CNT agglomeration, while utilizing the photocatalytic self-cleaning properties of zinc oxide to address the contamination and ineffectiveness of traditional antistatic agents. The hyperbranched PAMAM's sustained-release design and in-situ crosslinking process allow the antistatic agent to form a three-dimensional network within the fiber, resulting in over three times the washability of commercially available products. DETAILED DESCRIPTION

[0023] The exemplary embodiments shown will now be further refined. It should be understood that the following description is not intended to limit the embodiments to a preferred embodiment. On the contrary, it is intended to encompass alternatives, modifications, and equivalents that may be included within the spirit and scope of the embodiments defined by the appended claims.

[0024] Our company has developed a composite antistatic nylon-spandex air-wrapped yarn. This air-wrapped yarn is treated with antistatic agents from two perspectives: firstly, by adding an antistatic agent to the nylon, and secondly, by adding an antistatic oil to the air-wrapped yarn.

[0025] To this end, the present invention includes the preparation of the antistatic agent and the preparation of the antistatic oil.

[0026] The antistatic agent is composed of the following components by weight: 30-50% liquid ion-conductive polymer, 10-20% modified nano-zinc oxide / carbon nanotube hybrid material, 15-25% hyperbranched dendrimer polyamidoamine, 5-10% siloxane coupling agent, and the balance functional additives. The functional additives are hindered phenol antioxidants, benzotriazole UV absorbers, and sodium citrate as a pH adjuster.

[0027] Antistatic agents also include the preparation of various components: The liquid ion conductive polymer is a bifunctional ionic liquid, and the preparation steps are as follows: First, prepare the phosphate-functionalized imidazolium ionic liquid: add 10 mmol of 1-ethyl-3-methylimidazolium chloride and 50 mL of anhydrous acetonitrile into a dry three-necked flask, stir and dissolve, then add 15 mmol of triethyl phosphate and 1 mmol of potassium iodide, under nitrogen protection, heat to 80°C, and reflux for 12 hours; after the reaction, cool to room temperature, and remove acetonitrile by vacuum distillation; dissolve the crude product in dichloromethane, wash with water three times to remove unreacted triethyl phosphate and KI, and dry the organic phase with anhydrous sodium sulfate. The solvent was removed by rotary evaporation to obtain a white solid of 1-ethyl-3-methylimidazole diethyl phosphate; Second, 10 mmol of the above-mentioned phosphate product was dissolved in 30 mL of acetonitrile, 12 mmol of 1,3-propane sultone was added, and the reaction was stirred at 60°C for 8 hours. Then, 12 mmol of triethylamine was added to neutralize the acidic by-products generated by the reaction. The precipitate was filtered to remove the solvent, and the filtrate was distilled under reduced pressure to remove the solvent. The residue was extracted with an ethyl acetate / water mixture, and the organic phase was separated and further purified by silica gel column chromatography (eluent: methanol / dichloromethane = 1:10) to obtain a liquid ion conductive polymer with dual functionalization.

[0028] The modified nano-zinc oxide / carbon nanotube hybrid material is prepared by dispersing nano-zinc oxide in ethanol, adding acidified CNTs, and forming a ZnO@CNT core-shell structure through electrostatic self-assembly. The specific steps are as follows: Step 1, preparation of CNT dispersion: 50 mg of acidified CNTs were added to 100 mL of a 1:1 ethanol / water mixed solvent, along with 0.1 wt% of a surfactant, and ultrasonicated for more than 1 hour to form a uniform dispersion; Step 2: Sol preparation, Zinc precursor solution: Dissolve 10 mmol of Zn(NO3)2·6H2O in 50 mL of ethanol and stir for 30 minutes. Add the CNT dispersion dropwise to the zinc precursor solution and stir magnetically at 40°C for 2 hours. Add 10 mmol of urea as a hydrolysis catalyst and adjust the pH to 8-9. Step 3: Gelation and aging: heating to 80°C and stirring continuously for 6-12 hours, the sol gradually transforms into gel, aging treatment, and letting the gel stand for 24 hours to enhance the cross-linking of the ZnO precursor on the CNT surface; Step 4: Drying and calcination: Drying: vacuum drying at 60°C for 12 hours to obtain a CNT / ZnO precursor complex; Calcination: calcining at 350-450°C in a tube furnace for 2 hours to crystallize ZnO and form a CNT@ZnO core-shell structure.

[0029] The antistatic oil agent is composed of the following components by weight: base oil 70-80%, antistatic functional system 10-18%, emulsifying dispersion system 8-12%, functional additives 2-5%; Among them, the base oil is white oil with a kinematic viscosity of 12.0-16.0 mm² / s; The antistatic functional system includes 5-10% nitrogen-sulfur doped MXene composite antistatic agent, 2-8% hydrotalcite, and 3-6% conductive filler; Emulsifying dispersion system: castor oil polyoxyethylene ether, sodium secondary alkyl sulfonate, fatty alcohol polyoxyethylene ether, and lauryl sulfate ammonium salt are prepared in the ratio of 4:3:2:1; Functional additives include 1-4% of a sizing agent, such as sodium carboxymethyl cellulose, 0.5-1% of a hindered phenol antioxidant, and 0.1-0.3% of a silicone defoamer. The antistatic oil is prepared by the following method: Pretreatment: Calcinate the MXene material at 500-750°C in a H2S / Ar atmosphere to prepare sulfur-doped MXene, and then hydrothermally react with hexamethylenetetramine to generate nitrogen-sulfur-doped MXene. Synthesis of the antistatic functional system: Nitrogen-sulfur doped MXene and dodecyl phosphate are mixed in a mass ratio of 1:3-5, and subjected to dual-frequency ultrasonic treatment at an alternating frequency of 35-135 kHz for 1-3 hours to form a uniformly dispersed antistatic composite liquid; Oil preparation: Heat the base oil to 60°C, add the composite hydrotalcite, conductive filler, and antistatic composite liquid in sequence, and stir at a high speed of more than 2000r / min for 30 minutes; add the emulsifying dispersant, sizing agent, and antioxidant, and stir at a medium speed of less than 800r / min for 1 hour; finally, add the defoaming agent, degas in vacuum, and cool to room temperature to obtain the finished oil.

[0030] After preparing the above components, a composite antistatic nylon-ammonia air-coated yarn is prepared, which is specifically prepared by the following steps: Step 1: Raw material ratio and melt extrusion: Use a precision weight feeder to add 96% to 98.5% of nylon chips and 1.5% to 4.0% of antistatic agent to the extruder in proportion. Control the melt temperature at 245 to 265°C and stabilize the melt flow index at 0.615 to 0.67 dl / g to ensure the uniformity of the spinning melt. Step 2: Optimize the pre-spinning process, use the side-blowing cooling system, and adjust the cooling parameters: air temperature 7-10℃, humidity 86-91%, and wind speed 0.8-0.86m / s. Step 3: POY physical index test and texturing process adaptation, spandex POY and nylon POY are compounded in a texturing machine to prepare nylon-spandex air-coated yarn. Based on the test results, the texturing process is adjusted to: draw ratio 1.45-1.65, hot box temperature 180-210°C, false twist tension 0.25-0.35 cN / dtex; Step 4: Add antistatic oil to the nylon-ammonia air-coated yarn in step 3 using an oiling system, so that it is evenly attached to the surface of the composite antistatic nylon-ammonia air-coated yarn to achieve a better antistatic effect, and finally obtain the composite antistatic nylon-ammonia air-coated yarn.

[0031] Example 1: First, an antistatic agent is prepared by mixing 50% liquid ion-conductive polymer, 20% modified nano-zinc oxide / carbon nanotube hybrid material, 15% hyperbranched dendrimer polyamidoamine, 5% siloxane coupling agent, and the remainder functional additives. The functional additives are 5% hindered phenol antioxidant, 3% benzotriazole UV absorber, and 2% sodium citrate as a pH adjuster.

[0032] Then, an antistatic oil agent was prepared according to the following formula: 80% base oil, 10% antistatic functional system, 8% emulsified dispersion system, and 2% functional additive; Among them, the base oil is white oil with a kinematic viscosity of 12.0-16.0 mm² / s; The antistatic functional system includes 5% nitrogen-sulfur doped Mxene composite antistatic agent, 2% hydrotalcite, and 3% conductive filler; Castor oil polyoxyethylene ether, sodium secondary alkyl sulfonate, fatty alcohol polyoxyethylene ether, and lauryl sulfate ammonium salt are prepared in the ratio of 4:3:2:1; Functional additives include 1% of a sizing agent selected from sodium carboxymethyl cellulose, 0.7% of a hindered phenolic antioxidant, and 0.3% of a silicone defoaming agent; and are prepared according to the following steps: Pretreatment: The MXene material was calcined at 750°C in a H2S / Ar atmosphere to prepare sulfur-doped MXene, which was then hydrothermally reacted with hexamethylenetetramine to generate nitrogen-sulfur-doped MXene. Synthesis of the antistatic functional system: Nitrogen-sulfur doped MXene and dodecyl phosphate were mixed in a mass ratio of 1:3 and subjected to dual-frequency ultrasonic treatment at an alternating frequency of 35-135 kHz for 3 hours to form a uniformly dispersed antistatic composite liquid; Oil preparation: Heat the base oil to 60°C, add the composite hydrotalcite, conductive filler, and antistatic composite liquid in sequence, and stir at a high speed of more than 2000r / min for 30 minutes; add the emulsifying dispersant, sizing agent, and antioxidant, and stir at a medium speed of less than 800r / min for 1 hour; finally, add the defoaming agent, degas in vacuum, and cool to room temperature to obtain the finished oil.

[0033] A composite antistatic nylon-ammonia air-coated yarn, comprising the following steps: Step 1: Raw material ratio and melt extrusion: Use a precision weight feeder to add 96% nylon chips and 4.0% antistatic agent to the extruder in proportion. Control the melt temperature at 245-265°C and stabilize the melt flow index at 0.615-0.67dl / g to ensure the uniformity of the spinning melt. The antistatic agent is added in the form of antistatic masterbatch, and the final content is based on the antistatic agent content. Step 2: Optimize the pre-spinning process, use the side-blowing cooling system, and adjust the cooling parameters: air temperature 7-10℃, humidity 86-91%, and wind speed 0.8-0.86m / s. Step 3: POY physical index test and texturing process adaptation, spandex POY and nylon POY are compounded in a texturing machine to prepare nylon-spandex air-coated yarn. Based on the test results, the texturing process is adjusted to: draw ratio 1.45-1.65, hot box temperature 180-210°C, false twist tension 0.25-0.35 cN / dtex; Step 4: Add antistatic oil to the nylon-ammonia air-coated yarn in step 3 using an oiling system, so that it is evenly attached to the surface of the composite antistatic nylon-ammonia air-coated yarn to achieve a better antistatic effect, and finally obtain the composite antistatic nylon-ammonia air-coated yarn.

[0034] Example 2: A composite antistatic nylon-ammonia air-coated yarn, comprising the following steps: Step 1: Raw material ratio and melt extrusion: Use a precision weight feeder to add 98% nylon chips and 2% antistatic agent to the extruder in proportion. Control the melt temperature at 245-265°C and stabilize the melt flow index at 0.615-0.67dl / g to ensure the uniformity of the spinning melt. The antistatic agent is added in the form of antistatic masterbatch, and the final content is based on the antistatic agent content. Step 2: Optimize the pre-spinning process, use the side-blowing cooling system, and adjust the cooling parameters: air temperature 7-10℃, humidity 86-91%, and wind speed 0.8-0.86m / s. Step 3: POY physical index test and texturing process adaptation, spandex POY and nylon POY are compounded in a texturing machine to prepare nylon-spandex air-coated yarn. Based on the test results, the texturing process is adjusted to: draw ratio 1.65, hot box temperature 180-210°C, false twist tension 0.35 cN / dtex; Step 4: Add antistatic oil to the nylon-ammonia air-coated yarn in step 3 using an oiling system, so that it is evenly attached to the surface of the composite antistatic nylon-ammonia air-coated yarn to achieve a better antistatic effect, and finally obtain the composite antistatic nylon-ammonia air-coated yarn.

[0035] Example 3: A composite antistatic nylon-ammonia air-coated yarn, comprising the following steps: Step 1: Raw material ratio and melt extrusion: Use a precision weight feeder to add 96% nylon chips and 4.0% antistatic agent to the extruder in proportion. Control the melt temperature at 245-265°C and stabilize the melt flow index at 0.615-0.67dl / g to ensure the uniformity of the spinning melt. The antistatic agent is added in the form of antistatic masterbatch, and the final content is based on the antistatic agent content. Step 2: Optimize the pre-spinning process, use the side-blowing cooling system, and adjust the cooling parameters: air temperature 7-10℃, humidity 86-91%, and wind speed 0.8-0.86m / s. Step 3: POY physical index test and texturing process adaptation, spandex POY and nylon POY are compounded in a texturing machine to prepare nylon-spandex air-coated yarn. Based on the test results, the texturing process is adjusted to: draw ratio 1.55, hot box temperature 190°C, false twist tension 0.25 cN / dtex; Step 4: Add antistatic oil to the nylon-ammonia air-coated yarn in step 3 using an oiling system, so that it is evenly attached to the surface of the composite antistatic nylon-ammonia air-coated yarn to achieve a better antistatic effect, and finally obtain the composite antistatic nylon-ammonia air-coated yarn.

[0036] Comparative Example 1: On the basis of Example 1, the antistatic oil agent is omitted.

[0037] Comparative Example 2: On the basis of conventional nylon-spandex coated yarn, the antistatic agent of the present invention is used to perform oiling operation.

[0038] Then, performance tests were performed on the products of Examples 1-3 and Comparative Examples 1-2.

[0039] Comparative Example 3: Conventional nylon does not use antistatic agents and is not oiled with antistatic oil.

[0040] Performance testing: Antistatic properties are in accordance with GB / T 12703.1-2021 standard; Washability is tested by measuring the rate of change of surface resistance after multiple (50 times) washing or rubbing; The stability of the fiber's antistatic properties was evaluated in a low humidity environment (RH 30%), combining environmental adaptability testing, long-term aging experiments and multi-dimensional characterization methods.

[0041] Standard reference: ISO 18080-4 (static test at low humidity) AATCC 134 (static performance of fabrics at low humidity); Example 1 Example 2 Example 3 Comparative Example 1 Example 2 Comparative Example 3 Surface resistance ≤1.5×10^8Ω ≤1.5×10^8Ω ≤1.5×10^8Ω <![CDATA[≤6.5×10 8 Oh]]> <10^9 Ω <10^12Ω Washability ＜15% ＜15% ＜15% ＜15% ＜20% Surface resistance changes at low humidity <20 times <20 times <20 times <50 times <100 times Compared with commercially available quaternary ammonium salt and polyether antistatic agents, this solution has stability advantages in low humidity environments (RH 30%).

[0042] It is obvious to those skilled in the art that certain modifications, combinations and variations can be made based on the above teachings.

Claims

1. A composite antistatic nylon-ammonia air-coated yarn, characterized by: Prepared by the following steps: Step 1: Raw material ratio and melt extrusion: Use a precision weight feeder to add 96% to 98.5% of nylon chips and 1.5% to 4.0% of antistatic agent to the extruder in proportion. Control the melt temperature at 245 to 265°C and stabilize the melt flow index at 0.615 to 0.67 dl / g to ensure the uniformity of the spinning melt. Step 2: Optimize the pre-spinning process, use the side-blowing cooling system, and adjust the cooling parameters: air temperature 7-10℃, humidity 86-91%, and wind speed 0.8-0.86m / s. Step 3: POY physical index test and texturing process adaptation, spandex POY and nylon POY are compounded in a texturing machine to prepare nylon-spandex air-coated yarn. Based on the test results, the texturing process is adjusted to: draw ratio 1.45-1.65, hot box temperature 180-210°C, false twist tension 0.25-0.35 cN / dtex; Step 4: Add antistatic oil to the nylon-ammonia air-coated yarn in step 3 using an oiling system, so that it is evenly attached to the surface of the composite antistatic nylon-ammonia air-coated yarn to achieve a better antistatic effect, and finally obtain the composite antistatic nylon-ammonia air-coated yarn.

2. The composite antistatic nylon-spandex air-coated yarn according to claim 1, characterized in that: The antistatic agent in step 1 is composed of the following components by weight percentage: 30-50% of liquid ion conductive polymer, 10-20% of modified nano zinc oxide / carbon nanotube hybrid material, 15-25% of hyperbranched dendritic polymer polyamide amine, 5-10% of siloxane coupling agent, and the balance of functional additives.

3. The composite antistatic nylon-spandex air-coated yarn according to claim 1, characterized in that: The liquid ion conductive polymer is a bifunctional ionic liquid, and the preparation steps are as follows: First, prepare phosphate-functionalized imidazolium ionic liquid: add 10 mmol of 1-ethyl-3-methylimidazolium chloride and 50 mL of anhydrous acetonitrile into a dry three-necked flask, stir and dissolve, then add 15 mmol of triethyl phosphate and 1 mmol of potassium iodide, and under nitrogen protection, heat to 80°C and reflux for 12 hours. After the reaction, cool to room temperature and remove acetonitrile by vacuum distillation. Dissolve the crude product with dichloromethane and wash with water three times to remove unreacted triethyl phosphate and KI. Dry the organic phase with anhydrous sodium sulfate. The solvent was removed by rotary evaporation to obtain a white solid of 1-ethyl-3-methylimidazole diethyl phosphate; Second, 10 mmol of the above-mentioned phosphate product was dissolved in 30 mL of acetonitrile, 12 mmol of 1,3-propane sultone was added, and the reaction was stirred at 60°C for 8 hours. Then, 12 mmol of triethylamine was added to neutralize the acidic by-products generated by the reaction. The precipitate was filtered to remove the solvent, and the filtrate was distilled under reduced pressure to remove the solvent. The residue was extracted with an ethyl acetate / water mixture, and the organic phase was separated and further purified by silica gel column chromatography (eluent: methanol / dichloromethane = 1:10) to obtain a liquid ion conductive polymer with dual functionalization.

4. The composite antistatic nylon-spandex air-coated yarn according to claim 1, characterized in that: The modified nano-zinc oxide / carbon nanotube hybrid material is prepared by dispersing nano-zinc oxide in ethanol, adding acidified CNTs, and forming a ZnO@CNT core-shell structure through electrostatic self-assembly. The specific steps are as follows: Step 1, preparation of CNT dispersion: 50 mg of acidified CNTs were added to 100 mL of a 1:1 ethanol / water mixed solvent, along with 0.1 wt% of a surfactant, and ultrasonicated for more than 1 hour to form a uniform dispersion; Step 2: Sol preparation, Zinc precursor solution: Dissolve 10 mmol of Zn(NO3)2·6H2O in 50 mL of ethanol and stir for 30 minutes. Add the CNT dispersion dropwise to the zinc precursor solution and stir magnetically at 40°C for 2 hours. Add 10 mmol of urea as a hydrolysis catalyst and adjust the pH to 8-9. Step 3: Gelation and aging: heating to 80°C and stirring continuously for 6-12 hours, the sol gradually transforms into gel, aging treatment, and letting the gel stand for 24 hours to enhance the cross-linking of the ZnO precursor on the CNT surface; Step 4: Drying and calcination: Drying: vacuum drying at 60°C for 12 hours to obtain a CNT / ZnO precursor complex; Calcination: calcining at 350-450°C in a tube furnace for 2 hours to crystallize ZnO and form a CNT@ZnO core-shell structure.

5. The composite antistatic nylon-spandex air-coated yarn according to claim 1, characterized in that: The functional additives are hindered phenol antioxidants, benzotriazole ultraviolet absorbers and pH regulator sodium citrate.

6. The composite antistatic nylon-spandex air-coated yarn according to claim 1, characterized in that: The antistatic oil agent is composed of the following components by weight: base oil 70-80%, antistatic functional system 10-18%, emulsifying dispersion system 8-12%, functional additives 2-5%; Among them, the base oil is white oil with a kinematic viscosity of 12.0-16.0 mm² / s; The antistatic functional system includes 5-10% nitrogen-sulfur doped MXene composite antistatic agent, 2-8% hydrotalcite, and 3-6% conductive filler; Emulsifying dispersion system: castor oil polyoxyethylene ether, sodium secondary alkyl sulfonate, fatty alcohol polyoxyethylene ether, and lauryl sulfate ammonium salt are prepared in the ratio of 4:3:2:1; Functional additives include 1-4% of a sizing agent selected from sodium carboxymethyl cellulose, 0.5-1% of a hindered phenol antioxidant and 0.1-0.3% of a silicone defoaming agent.

7. The composite antistatic nylon-spandex air-coated yarn according to claim 1, characterized in that: The antistatic oil is prepared by the following method: Pretreatment: Calcine the MXene material at 500-750°C in a H2S / Ar atmosphere to prepare sulfur-doped MXene, and then hydrothermally react with hexamethylenetetramine to generate nitrogen-sulfur-doped MXene. Synthesis of the antistatic functional system: Nitrogen-sulfur doped MXene and dodecyl phosphate are mixed in a mass ratio of 1:3-5, and subjected to dual-frequency ultrasonic treatment at an alternating frequency of 35-135 kHz for 1-3 hours to form a uniformly dispersed antistatic composite liquid; Oil preparation: Heat the base oil to 60°C, add the composite hydrotalcite, conductive filler, and antistatic composite liquid in sequence, and stir at a high speed of more than 2000r / min for 30 minutes; add the emulsifying dispersant, sizing agent, and antioxidant, and stir at a medium speed of less than 800r / min for 1 hour; finally, add the defoaming agent, degas in vacuum, and cool to room temperature to obtain the finished oil.