In-situ polymerization yarn-dyed yarn and preparation method thereof

Abstract

The invention provides an in-situ polymerization yarn-dyed yarn and a preparation method thereof, and relates to the technical field of yarn spinning. The preparation method of the in-situ polymerization yarn-dyed yarn comprises the following steps: S1, mixing and dissolving a polymer, a solvent coloring agent and a complexing agent in proportion to obtain a spinning solution; s2, electrostatic spinning, cotton carding and inlaying are carried out at the same time, and colored nanofiber / cotton composite cotton slivers are obtained; and S3, drawing and spinning to prepare yarns. Pollution is reduced by compounding colored nanofibers and a cotton web and canceling an after-finishing link, polydimethyldiallylammonium chloride is selected as a complexing agent to prepare a spinning solution, and due to a cross-linked structure formed by combining the complexing agent and dye, the volume of a cross-linked body carrying the dye is increased, the cohesive force with a polymer is enhanced, and the color fastness of the cross-linked body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of yarn textile, in particular to an in-situ polymerized color-dyed yarn and a preparation method thereof. Background Art

[0002] The production of colored fabrics usually involves dyeing and finishing after the yarn or fabric is produced, but this dyeing method is complex, consumes a lot of energy, and causes great pollution. If the dyes and chemicals used in the dyeing process are discharged directly without treatment, it will cause water pollution, soil pollution, air pollution, and even affect the health of workers. By changing the dyeing method through textile process reengineering, the most serious emission link in traditional dyeing has been replaced. With the advantages of streamlined links and no wastewater discharge, it has become a new method of textile coloring that can be widely used in factories.

[0003] After searching, the existing Chinese patent announcement number is: CN118461161A, which proposes a "method for preparing spinning solution and cotton composite yarn and cotton composite yarn and fabric", which uses spinning solution and cotton fiber for composite spinning through electrostatic spinning. The spinning solution of this technology contains a polymer solution and a colorant, a cross-linking agent and a photoinitiator dissolved in the polymer solution. The colored nanofibers are then made by electrostatic spinning and embedded in the cotton net. This method eliminates the dyeing method in traditional dyeing, solves the problems of complex process, high labor and resource consumption, and high pollution, and improves the utilization rate of dyes.

[0004] However, this technical solution still has shortcomings: the addition of photoinitiators in the product generates cations and cross-linking agents to form a three-dimensional structure. The yarns produced in actual production do not have sufficient color fastness, the dyes and polymers do not bind well, and precipitate from the colored nanofibers, which has a significant impact on the color loss of the product.

[0005] In addition, the existing Chinese patent announcement number is: CN115434168A, which provides a "one-bath two-step immersion dyeing method for polyester-cotton fabrics with disperse reactive dyes", in which a metal complexing agent is used to increase color fastness. The metal complexing agent is often used to remove metal ions in 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 are shown in most traditional dyeing-related patents, but their effects are small and their application range is limited. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an in-situ polymerized color-woven yarn and a preparation method thereof, which solves the problems of insufficient color fastness of the yarn, insufficient binding force between the dye and the polymer, and a significant impact on the color shedding of the product.

[0007] To achieve the above objectives, the present invention is implemented through the following technical scheme: an in-situ polymerized color-woven 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 NN-dimethylformamide, the colorant is an anionic dye, and the complexing agent is polydimethyldiallylammonium chloride.

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

[0009] S1. Preparation of spinning solution

[0010] Add the polymer and solvent into the mixing kettle in proportion, and continue stirring for more than 8 hours in a sealed environment until the polymer is completely dissolved, then add the colorant and complexing agent into the mixing kettle, control the stirring environment temperature at 30-60°C, the environment humidity at 55%, and mix well to obtain the spinning solution;

[0011] S2. Electrospinning

[0012] First, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to form a uniform cotton roll; the cotton roll is combed, and while combing, the colored spinning solution is electrostatically spun, the prepared spinning solution is added to the liquid reservoir of the electrostatic spinning generator, and then the electrostatic spinning nozzle is placed under the cotton combing machine, and the spinning solution is extruded through the spinneret holes of the spinneret die head and embedded on the cotton net, and the cotton combing and embedding are carried out simultaneously to obtain a colored nanofiber / cotton composite cotton strip;

[0013] S3.Drawing Spinning

[0014] The composite cotton strips are made into yarn through combing, 2-3 drawing, roving and spun spinning processes.

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

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

[0017] The present invention provides an in-situ polymerized yarn and a preparation method thereof, which has the following beneficial effects:

[0018] 1. The present invention reduces pollution by using colored nanofibers and cotton nets to compound and eliminate the post-finishing process, and selects polydimethyldiallylammonium chloride as a complexing agent to configure the spinning solution. Due to the cross-linked structure formed by the complexing agent and the dye, the volume occupied by the cross-linked body carrying the dye is increased, the cohesion with the polymer is enhanced, and its color fastness is improved. In addition, the complexing agent can form a chemical bond with the dye, which is more stable than the physical bond. The formed macromolecules are wrapped in the polymer, which is more difficult to precipitate, thereby increasing the color fastness. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1:

[0021] The embodiment of the present invention provides an in-situ polymerized color-woven yarn, comprising the following raw materials in percentage: 5% polymer, 50% solvent, 35% colorant and 10% complexing agent, wherein the polymer is polyacrylonitrile, the solvent is NN-dimethylformamide, the colorant is anosin red, and the complexing agent is polydimethyldiallylammonium chloride.

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

[0023] S1. Preparation of spinning solution

[0024] Add the polymer and solvent into the mixing kettle in proportion, and continue stirring for more than 8 hours in a sealed environment until the polymer is completely dissolved, then add the colorant and complexing agent into the mixing kettle, control the stirring environment temperature at 60°C and the environment humidity at 55%, and mix well to obtain the spinning solution;

[0025] S2. Electrospinning

[0026] First, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to form a uniform cotton roll; the cotton roll is combed, and while combing, the colored spinning solution is electrostatically spun, the prepared spinning solution is added to the liquid reservoir of the electrostatic spinning generator, and then the electrostatic spinning nozzle is placed under the cotton combing machine, and the spinning solution is extruded through the spinneret holes of the spinneret die head and embedded on the cotton net, and the cotton combing and embedding are carried out simultaneously to obtain a colored nanofiber / cotton composite cotton strip;

[0027] S3.Drawing Spinning

[0028] The composite cotton sliver is made into yarn through the processes of combing, three-step drawing, roving and spun spinning.

[0029] In step S2, the trash 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 of the electrospinning is 20 kV, the receiving distance between the spinneret and the cotton mesh is 20 cm, the spinning environment temperature is 25° C., and the spinning environment humidity is 60%.

[0031] The molecular formula of polydimethyldiallylammonium chloride is as follows:

[0032] .

[0033] The molecular formula of Annosu Red is as follows:

[0034] .

[0035] The polymer is combined with Annosu Red. This chemical bonding is stronger than physical adsorption, reducing the risk of dye shedding. In addition, the polymer is a cationic polymer, which can improve the adsorption capacity of the dye on the fiber surface, thereby increasing the concentration and uniformity of the dye and reducing fading caused by washing or friction. In some cases, cationic polymers can promote the cross-linking reaction between the dye and the fiber to form a three-dimensional network structure, further improving the fastness of the dye. At the same time, the complexing agent has a chain structure, which can enhance the physical barrier effect of the fiber surface on the dye and reduce the chance of the dye being lost due to environmental factors after dyeing.

[0036] Embodiment 2:

[0037] The embodiment of the present invention provides an in-situ polymerized color-woven yarn, comprising the following raw materials in percentage: 20% polymer, 68% solvent, 10% colorant and 2% complexing agent, wherein the polymer is polyacrylonitrile, the solvent is NN-dimethylformamide, the colorant is anosulphur red, and the complexing agent is polydimethyldiallylammonium chloride.

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

[0039] S1. Preparation of spinning solution

[0040] Add the polymer and solvent into the mixing kettle in proportion, and continue stirring for more than 8 hours in a sealed environment until the polymer is completely dissolved, then add the colorant and complexing agent into the mixing kettle, control the stirring environment temperature at 30°C and the environment humidity at 55%, and mix well to obtain the spinning solution;

[0041] S2. Electrospinning

[0042] First, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to form a uniform cotton roll; the cotton roll is combed, and while combing, the colored spinning solution is electrostatically spun, the prepared spinning solution is added to the liquid reservoir of the electrostatic spinning generator, and then the electrostatic spinning nozzle is placed under the cotton combing machine, and the spinning solution is extruded through the spinneret holes of the spinneret die head and embedded on the cotton net, and the cotton combing and embedding are carried out simultaneously to obtain a colored nanofiber / cotton composite cotton strip;

[0043] S3.Drawing Spinning

[0044] The composite cotton sliver is made into yarn through the processes of combing, two-step drawing, roving and spun spinning.

[0045] In step S2, the trash 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 of the electrospinning is 20 kV, the receiving distance between the spinneret and the cotton mesh is 20 cm, the spinning environment temperature is 25° C., and the spinning environment humidity is 60%.

[0047] Embodiment three:

[0048] The embodiment of the present invention provides an in-situ polymerized color-woven yarn, comprising the following raw materials in percentage: 15% of a polymer, 65% of a solvent, 15% of a colorant and 5% of a complexing agent, wherein the polymer is polyacrylonitrile, the solvent is NN-dimethylformamide, the colorant is anosulphur red, and the complexing agent is polydimethyldiallylammonium chloride.

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

[0050] S1. Preparation of spinning solution

[0051] Add the polymer and solvent into the mixing kettle in proportion, and continue stirring for more than 8 hours in a sealed environment until the polymer is completely dissolved, then add the colorant and complexing agent into the mixing kettle, control the stirring environment temperature at 32°C and the environment humidity at 55%, and mix well to obtain the spinning solution;

[0052] S2. Electrospinning

[0053] First, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to form a uniform cotton roll; the cotton roll is combed, and while combing, the colored spinning solution is electrostatically spun, the prepared spinning solution is added to the liquid reservoir of the electrostatic spinning generator, and then the electrostatic spinning nozzle is placed under the cotton combing machine, and the spinning solution is extruded through the spinneret holes of the spinneret die head and embedded on the cotton net, and the cotton combing and embedding are carried out simultaneously to obtain a colored nanofiber / cotton composite cotton strip;

[0054] S3.Drawing Spinning

[0055] The composite cotton sliver is made into yarn through the processes of combing, three-step drawing, roving and spun spinning.

[0056] In step S2, the trash 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 of the electrospinning is 20 kV, the receiving distance between the spinneret and the cotton mesh is 20 cm, the spinning environment temperature is 25° C., and the spinning environment humidity is 60%.

[0058] The K / S value of the yarn is 15.5. After adding 5 g / L of soap solution and washing at 95°C for 10 min, the K / S value is 14.3.

[0059] Comparative Example 1:

[0060] The comparative example of the present invention provides a method for preparing an in-situ polymerized color-dyed yarn, comprising the following process:

[0061] S1. Take 8wt% of the polymer in the total solution and add it to the solvent. Stir for more than 8h until it dissolves. The stirring temperature is 32℃ and the humidity is 55%. Add 15wt% 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 anosin red.

[0062] S2. Firstly, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to form a uniform cotton roll; the cotton roll is combed, and while combing, the colored spinning solution is electrospun, and the prepared spinning solution is added to the liquid reservoir of the electrospinning generator, and then the electrospinning nozzle is placed under the carding machine, and the spinning solution is extruded through the spinneret holes of the spinneret die and embedded into the cotton net. The combing and embedding are carried out simultaneously to obtain colored nanofiber / cotton composite cotton strips.

[0063] S3. The composite cotton strips are made into yarn through the processes of combing, three-step drawing, roving and spun spinning.

[0064] In step S2, the trash 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 of the electrospinning is 20 kV, the receiving distance between the spinneret and the cotton mesh is 20 cm, the spinning environment temperature is 25° C., and the spinning environment humidity is 60%.

[0066] The K / S value of the composite yarn is 15.9. After being prepared with 5 g / L of soap solution and soap-washed at 95° C. for 10 min, 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 of the colored nanofiber / cotton composite yarn is not significantly changed after soaping, and the K / S value does not fluctuate much compared to when no complexing agent is added.

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

Claims

1. An in-situ polymerized yarn, characterized in that: The invention comprises the following raw materials in percentage: 5-20% polymer, 50-68% solvent, 10-35% colorant and 2-10% complexing agent, wherein the polymer is polyacrylonitrile, the solvent is NN-dimethylformamide, the colorant is anionic dye, and the complexing agent is polydimethyldiallylammonium chloride.

2. The method for preparing an in-situ polymerized yarn according to claim 1, characterized in that: The following steps are involved: S1. Preparation of spinning solution Add the polymer and solvent into the mixing kettle in proportion, and continue stirring for more than 8 hours in a sealed environment until the polymer is completely dissolved, then add the colorant and complexing agent into the mixing kettle, control the stirring environment temperature at 30-60°C, the environment humidity at 55%, and mix well to obtain the spinning solution; S2. Electrospinning First, the short-fiber raw cotton is blended, and then the cotton is opened and cleaned to form uniform cotton rolls; The cotton roll is subjected to a carding process, and while carding, the colored spinning solution is electrostatically spun, the prepared spinning solution is added to a liquid reservoir of an electrostatic spinning generator, and then the electrostatic spinning nozzle is placed under the carding machine, and the spinning solution is extruded through the spinneret holes of the spinneret die head and embedded onto the cotton net, and the carding and embedding are carried out simultaneously to obtain a colored nanofiber / cotton composite sliver; S3.Drawing Spinning The composite cotton strips are made into yarn through combing, 2-3 drawing, roving and spun spinning processes.

3. The method for preparing an in-situ polymerized yarn according to claim 2, characterized in that: In the step S2, the trash 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%.

4. The method for preparing an in-situ polymerized yarn according to claim 2, characterized in that: In the step S2, the applied voltage of the electrospinning is 20 kV, the receiving distance between the spinneret and the cotton mesh is 20 cm, the spinning environment temperature is 25° C., and the spinning environment humidity is 60%.

5. Application of the yarn obtained by the preparation method according to any one of claims 2 to 4 on colored fabrics, characterized in that: The K / S value of the yarn is 15.

5. After 5 g / L of soap solution is added and soaped at 95° C. for 10 minutes, the K / S value is 14.3.