An in-situ polymerized yarn and its preparation method

Abstract

This invention provides an in-situ polymerized yarn and its preparation method, relating to the field of yarn textile technology. The preparation method of this in-situ polymerized yarn includes the following steps: S1. Mixing a polymer, solvent colorant, and complexing agent in a specific ratio to obtain a spinning solution; S2. Simultaneously performing electrospinning, carding, and embedding to obtain a colored nanofiber / cotton composite sliver; S3. Drawing and spinning the sliver to produce yarn. By using colored nanofibers composited with a cotton web, the finishing process is eliminated to reduce contamination. The selection of polydimethyldiallyl ammonium chloride as a complexing agent in the spinning solution increases the volume occupied by the cross-linked structure formed by the complexing agent and dye, enhancing the cohesion with the polymer and improving its color fastness.

Description

Technical Field

[0001] This invention relates to the field of yarn textile technology, specifically to an in-situ polymerized yarn and its preparation method. Background Technology

[0002] The production of colored fabrics typically involves dyeing and finishing after the yarn or fabric is produced. However, this dyeing method is complex, energy-intensive, and highly polluting. If the dyes and chemicals used in the dyeing process are discharged directly without treatment, it can lead to water, soil, and air pollution, and even affect worker health. By re-engineering the textile process to change the dyeing method, replacing the most polluting step in traditional dyeing, and leveraging its streamlined process and lack of wastewater discharge, it has become a new method for dyeing textiles that can be widely used in factories.

[0003] A search revealed a Chinese patent publication number, CN118461161A, which proposes a method for preparing a cotton composite yarn using a spinning solution, and the resulting cotton composite yarn and fabric. This method involves electrospinning a spinning solution and cotton fibers to create a composite yarn. The spinning solution contains a polymer solution and colorants, crosslinking agents, and photoinitiators dissolved in the polymer solution. Subsequently, colored nanofibers are produced through electrospinning and embedded in a cotton web. This method eliminates the traditional dyeing process, solving problems such as complex processes, high labor and resource consumption, and significant pollution, while improving dye utilization.

[0004] However, this technical solution still has shortcomings: the addition of photoinitiators to the product causes the generation of cations to form a three-dimensional structure with the crosslinking agent. In actual production, the color fastness of the yarn produced is insufficient, the binding force between the dye and the polymer is insufficient, and the dye is released from the colored nanofibers, which has a significant impact on the color fading of the product.

[0005] In addition, there is a Chinese patent publication number CN115434168A that provides a "one-bath two-step immersion dyeing method for polyester-cotton fabrics with disperse reactive dyes". In this method, metal complexing agents are used to increase color fastness. Metal complexing agents are often used to remove metal ions from water, adjust water quality, prevent metal ions from reacting with dyes during the dyeing process, and avoid fading problems caused by metal ions. Metal complexing agents have been shown in most traditional dyeing-related patents, but their effects are relatively small and their application is limited. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an in-situ polymerized yarn and its preparation method, which solves the problems of insufficient yarn color fastness, insufficient bonding force between dye and polymer, and significant impact on color fading of products.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: an in-situ polymerized yarn, comprising the following percentage raw materials: 5-20% polymer, 50-68% solvent, 10-35% colorant and 2-10% complexing agent, wherein the polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, the colorant is anionic dye, and the complexing agent is polydimethyldiallylammonium chloride.

[0008] A method for preparing in-situ polymerized yarn-dyed yarn includes the following steps:

[0009] S1. Prepare spinning solution

[0010] The polymer and solvent are added to the mixing tank in proportion and stirred continuously for more than 8 hours in a sealed environment until the polymer is completely dissolved. Then, the colorant and complexing agent are added to the mixing tank. The temperature of the stirring environment is controlled at 30-60℃ and the humidity is 55%. After mixing evenly, the spinning solution is obtained.

[0011] S2. Electrospinning

[0012] First, the short-fiber raw cotton is blended, then the cotton is opened and cleaned to produce a uniform cotton roll. The cotton roll is then carded, and simultaneously, electrospinning of the colored spinning solution is performed. The prepared spinning solution is added to the reservoir of the electrospinning generator, and then the electrospinning nozzle is placed under the carding machine. The spinning solution is extruded through the spinneret orifice and embedded into the cotton web. Carding and embedding are performed simultaneously to obtain colored nanofiber / cotton composite slivers.

[0013] S3. Draw spun yarn

[0014] The composite cotton sliver is processed into yarn through combing, 2-3 drawing processes, roving, and spinning.

[0015] Preferably, in step S2, the impurity content of the cotton roll after opening and cleaning is controlled to be below 1%, and the unevenness rate is controlled to be below 1%.

[0016] Preferably, in step S2, the applied voltage for electrospinning is 20kV, the receiving distance between the spinneret and the cotton web is 20cm, the spinning environment temperature is 25℃, and the spinning environment humidity is 60%.

[0017] This invention provides an in-situ polymerized yarn-dyed fabric and its preparation method. It has the following beneficial effects:

[0018] 1. This invention reduces contamination by using colored nanofibers combined with cotton webs, eliminating the finishing process. Polydimethyldiallyl ammonium chloride is selected as a complexing agent in the spinning solution. The cross-linked structure formed by the complexing agent and dye increases the volume of the cross-linked dye-carrying body, enhancing the cohesion with the polymer and improving color fastness. Furthermore, the complexing agent can form a chemical bond with the dye, which is more stable than a physical bond. The resulting large molecules are encapsulated within the polymer, making them less prone to precipitation and further increasing color fastness. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1:

[0021] This invention provides an in-situ polymerized yarn, comprising the following percentages of raw materials: 5% polymer, 50% solvent, 35% colorant and 10% complexing agent. The polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, the colorant is Annox Red, and the complexing agent is polydimethyldiallylammonium chloride.

[0022] A method for preparing in-situ polymerized yarn-dyed yarn includes the following steps:

[0023] S1. Prepare spinning solution

[0024] The polymer and solvent are added to the mixing vessel in proportion and stirred continuously for more than 8 hours in a sealed environment until the polymer is completely dissolved. Then, the colorant and complexing agent are added to the mixing vessel. The stirring environment temperature is controlled at 60℃ and the ambient humidity is 55%. After mixing evenly, the spinning solution is obtained.

[0025] S2. Electrospinning

[0026] First, the short-fiber raw cotton is blended, then the cotton is opened and cleaned to produce a uniform cotton roll. The cotton roll is then carded, and simultaneously, electrospinning of the colored spinning solution is performed. The prepared spinning solution is added to the reservoir of the electrospinning generator, and then the electrospinning nozzle is placed under the carding machine. The spinning solution is extruded through the spinneret orifice and embedded into the cotton web. Carding and embedding are performed simultaneously to obtain colored nanofiber / cotton composite slivers.

[0027] S3. Draw spun yarn

[0028] The composite cotton sliver is processed into yarn through combing, three drawing processes, roving, and spinning.

[0029] In step S2, the impurity content of the cotton roll after opening and cleaning is controlled to be below 1%, and the unevenness rate is controlled to be below 1%.

[0030] In step S2, the applied voltage for electrospinning is 20kV, the receiving distance between the spinneret and the cotton web is 20cm, the spinning environment temperature is 25℃, and the spinning environment humidity is 60%.

[0031] The molecular formula of polydimethyldiallylammonium chloride is shown below:

[0032] .

[0033] The molecular formula of Annoxol Red is shown below:

[0034] .

[0035] The combination of the polymer and Annox Red, a chemical bond that is stronger than physical adsorption, reduces the risk of dye shedding. Furthermore, the polymer is cationic, which enhances the dye's adsorption capacity on the fiber surface, thereby increasing dye concentration and uniformity and reducing fading caused by washing or friction. In some cases, the cationic polymer can promote cross-linking reactions between the dye and fiber, forming a three-dimensional network structure, further improving colorfastness. Simultaneously, the complexing agent, with its chain-like structure, enhances the physical barrier effect of the fiber surface on the dye, reducing the chance of dye loss due to environmental factors after dyeing.

[0036] Example 2:

[0037] This invention provides an in-situ polymerized yarn, comprising the following percentages of raw materials: 20% polymer, 68% solvent, 10% colorant and 2% complexing agent. The polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, the colorant is Anoxin Red, and the complexing agent is polydimethyldiallylammonium chloride.

[0038] A method for preparing in-situ polymerized yarn-dyed yarn includes the following steps:

[0039] S1. Prepare spinning solution

[0040] The polymer and solvent are added to the mixing vessel in proportion and stirred continuously for more than 8 hours in a sealed environment until the polymer is completely dissolved. Then, the colorant and complexing agent are added to the mixing vessel. The stirring environment temperature is controlled at 30℃ and the ambient humidity is 55%. After mixing evenly, the spinning solution is obtained.

[0041] S2. Electrospinning

[0042] First, the short-fiber raw cotton is blended, then the cotton is opened and cleaned to produce a uniform cotton roll. The cotton roll is then carded, and simultaneously, electrospinning of the colored spinning solution is performed. The prepared spinning solution is added to the reservoir of the electrospinning generator, and then the electrospinning nozzle is placed under the carding machine. The spinning solution is extruded through the spinneret orifice and embedded into the cotton web. Carding and embedding are performed simultaneously to obtain colored nanofiber / cotton composite slivers.

[0043] S3. Draw spun yarn

[0044] The composite cotton sliver is processed into yarn through combing, two drawing processes, roving, and spinning.

[0045] In step S2, the impurity content of the cotton roll after opening and cleaning is controlled to be below 1%, and the unevenness rate is controlled to be below 1%.

[0046] In step S2, the applied voltage for electrospinning is 20kV, the receiving distance between the spinneret and the cotton web is 20cm, the spinning environment temperature is 25℃, and the spinning environment humidity is 60%.

[0047] Example 3:

[0048] This invention provides an in-situ polymerized yarn, comprising the following percentages of raw materials: 15% polymer, 65% solvent, 15% colorant and 5% complexing agent. The polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, the colorant is Anoxin Red, and the complexing agent is polydimethyldiallylammonium chloride.

[0049] A method for preparing in-situ polymerized yarn-dyed yarn includes the following steps:

[0050] S1. Prepare spinning solution

[0051] The polymer and solvent are added to the mixing vessel in proportion and stirred continuously for more than 8 hours in a sealed environment until the polymer is completely dissolved. Then, the colorant and complexing agent are added to the mixing vessel. The stirring environment temperature is controlled at 32℃ and the ambient humidity is 55%. After mixing evenly, the spinning solution is obtained.

[0052] S2. Electrospinning

[0053] First, the short-fiber raw cotton is blended, then the cotton is opened and cleaned to produce a uniform cotton roll. The cotton roll is then carded, and simultaneously, electrospinning of the colored spinning solution is performed. The prepared spinning solution is added to the reservoir of the electrospinning generator, and then the electrospinning nozzle is placed under the carding machine. The spinning solution is extruded through the spinneret orifice and embedded into the cotton web. Carding and embedding are performed simultaneously to obtain colored nanofiber / cotton composite slivers.

[0054] S3. Draw spun yarn

[0055] The composite cotton sliver is processed into yarn through combing, three drawing processes, roving, and spinning.

[0056] In step S2, the impurity content of the cotton roll after opening and cleaning is controlled to be below 1%, and the unevenness rate is controlled to be below 1%.

[0057] In step S2, the applied voltage for electrospinning is 20kV, the receiving distance between the spinneret and the cotton web is 20cm, the spinning environment temperature is 25℃, and the spinning environment humidity is 60%.

[0058] The yarn has a K / S value of 15.5. After preparing a 5g / L soap solution and washing it at 95℃ for 10 minutes, the K / S value is 14.3.

[0059] Comparative Example 1:

[0060] This invention provides a comparative example of a method for preparing in-situ polymerized yarn-dyed yarn, comprising the following steps:

[0061] S1. Take 8 wt% of the polymer in the total solution and add it to the solvent. Stir for more than 8 hours until dissolved. Stir at 32°C and 55% humidity. Add 15 wt% of the colorant and continue stirring to obtain a colored spinning solution. The polymer is polyacrylonitrile, the solvent is NN-dimethylformamide, and the colorant is Annox Red.

[0062] S2. First, the short-fiber raw cotton is blended, then the cotton is opened and cleaned to make a uniform cotton roll. The cotton roll is then carded. At the same time as carding, electrospinning of colored spinning solution is carried out. The prepared spinning solution is added to the reservoir of the electrospinning generator. Then the electrospinning nozzle is placed under the carding machine. The spinning solution is extruded through the spinneret orifice and embedded into the cotton web. Carding and embedding are carried out simultaneously to obtain colored nanofiber / cotton composite slivers.

[0063] S3. The composite cotton sliver is processed into yarn through combing, three-stage drawing, roving, and spinning processes.

[0064] In step S2, the impurity content of the cotton roll after opening and cleaning is controlled to be below 1%, and the unevenness rate is controlled to be below 1%.

[0065] In step S2, the applied voltage for electrospinning is 20kV, the receiving distance between the spinneret and the cotton web is 20cm, the spinning environment temperature is 25℃, and the spinning environment humidity is 60%.

[0066] The K / S value of the composite yarn is 15.9. After washing with 5g / L soap solution at 95℃ for 10 minutes, the K / S value is 11.13.

[0067] By comparing Example 3 with Comparative Example 1, it can be seen that when no complexing agent is added to the spinning solution, the color of the colored nanofiber / cotton composite yarn is significantly reduced after soaping, and the K / S value decreases significantly; when a complexing agent is added to the spinning solution, the color change of the colored nanofiber / cotton composite yarn is not obvious after soaping, and the K / S value does not fluctuate much compared with that without the addition of a complexing agent.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing in-situ polymerized yarn-dyed yarn, characterized in that: Includes the following steps: S1. Prepare spinning solution The polymer and solvent are added to a mixing vessel in proportion and stirred continuously for more than 8 hours in a sealed environment until the polymer is completely dissolved. Then, a colorant and a complexing agent are added to the mixing vessel. The stirring environment temperature is controlled at 30-60℃ and the ambient humidity is 55%. After mixing evenly, a spinning solution is obtained. The complexing agent is polydimethyldiallylammonium chloride. S2. Electrospinning First, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to make a uniform cotton roll. The cotton roll is carded, and electrospinning of colored spinning solution is carried out simultaneously. The prepared spinning solution is added to the reservoir of the electrospinning generator, and then the electrospinning nozzle is placed under the carding machine. The spinning solution is extruded through the spinneret orifice and embedded into the cotton web. Carding and embedding are carried out simultaneously to obtain colored nanofiber / cotton composite slivers. The applied voltage for electrospinning is 20kV, the receiving distance between the spinneret orifice and the cotton web is 20cm, the spinning environment temperature is 25℃, and the spinning environment humidity is 60%. S3. Draw spun yarn The composite cotton sliver is combed, drawn in 2-3 stages, roving, and spinning to produce yarn. The K / S value of the yarn is 15.

5. After being prepared with 5g / L soap solution and soaped at 95℃ for 10 minutes, the K / S value is 14.

3.

2. The method for preparing in-situ polymerized yarn according to claim 1, characterized in that: In step S2, the impurity content of the cotton roll after opening and cleaning is controlled to be below 1%, and the unevenness rate is controlled to be below 1%.

3. The in-situ polymerized yarn-dyed yarn prepared by the method for preparing in-situ polymerized yarn-dyed yarn according to claim 1, characterized in that: The raw materials include the following percentages: 5-20% polymer, 50-68% solvent, 10-35% colorant and 2-10% complexing agent, wherein the polymer is polyacrylonitrile, the solvent is N,N-dimethylformamide, and the colorant is anionic dye.

4. The application of yarn prepared by the in-situ polymerized yarn-dyed yarn preparation method according to claim 1 in colored fabrics.