A dope-colored low-melt fiber material and process

Abstract

This invention discloses a solution-dyed low-melting-point fiber material and its processing method. The method includes the following steps: Step 1: Terephthalic acid, ethylene glycol, isophthalic acid, and adipic acid are mixed, tetrabutyl titanate is added, and the mixture is reacted at 250°C for 3 hours. The temperature is then increased to 275°C, and the reaction is continued for 2.5 hours. After extrusion and pelletizing, the mixture is vacuum dried to obtain a low-melting-point copolyester. Step 2: The low-melting-point copolyester, colorant, dispersant, and antioxidant are added to a twin-screw extruder and extruded and pelletized to obtain a color masterbatch. Step 3: The color masterbatch, low-melting-point copolyester, modified copolymer, and carbon nanotubes are mixed and melted, then spun, cooled, oiled, hot-drawn, networked, and wound into a tube to obtain the finished product. Beneficial effects: This invention introduces isophthalic acid and adipic acid to disrupt the regularity of the polyester molecular chain. Simultaneously, through the synergistic effect of the modified copolymer and carbon nanotubes, the mechanical and electrical properties of the fiber are improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical fiber technology, specifically relating to a solution-dyed low-melting-point fiber material and its processing method. Background Technology

[0002] With the development of the textile industry and the increasing demand from consumers for diversified textile functions, fiber materials with special properties have received widespread attention. Low-melting-point fiber materials have important applications in nonwovens, composite materials, and other fields. For example, in the production of nonwovens, low-melting-point fibers can be used as bonding fibers. By heating them to melt, they can bond other fibers together to form nonwoven products with a certain strength and structure. Compared with the use of chemical adhesives, this method is more environmentally friendly and can give the products better flexibility and feel.

[0003] Traditional fiber dyeing methods are mostly post-dyeing processes, meaning that dyeing is performed after the fiber or fabric has been formed. However, post-dyeing processes have many drawbacks, such as complex processes, high water consumption, and the use of large amounts of chemical auxiliaries that can cause environmental pollution. Furthermore, for some special fibers, post-dyeing often fails to achieve ideal dyeing results and exhibits poor colorfastness. Solution dyeing, as an advanced fiber dyeing method, is gradually gaining attention. Solution dyeing involves adding colorants to polymer melts or solutions during fiber production, followed by mixing, spinning, and other processes to directly produce colored fibers. This method allows for simultaneous dyeing and spinning, achieving not only uniform coloring and improved colorfastness but also effectively shortening the production cycle, reducing costs, and minimizing pollution.

[0004] However, there are still some problems to be solved in the preparation and processing of solution-dyed low-melting-point fiber materials. On the one hand, the melting point control of low-melting-point fibers is not precise enough, which leads to unstable fiber bonding performance during processing and affects the quality of the final product. On the other hand, the compatibility between colorants and low-melting-point polymer matrices is poor, which easily leads to uneven dispersion of colorants, resulting in poor fiber color consistency and potentially adversely affecting the physical and mechanical properties of the fibers.

[0005] Therefore, developing a method for preparing and processing solution-dyed low-melting-point fiber materials that can precisely control the melting point, ensure uniform dispersion of colorants, and possess good physical and mechanical properties is of great practical significance. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a solution-dyed low-melting-point fiber material and a processing method thereof.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A method for processing solution-dyed low-melting-point fiber materials includes the following steps:

[0009] Step 1: Mix terephthalic acid, ethylene glycol, isophthalic acid and adipic acid, add tetrabutyl titanate, react at 250℃ for 3 hours, then raise the temperature to 275℃ and react for 2.5 hours. After extrusion and pelletizing, vacuum dry to obtain low melting point copolyester.

[0010] Step 2: Add low-melting-point copolyester, colorant, dispersant and antioxidant into a twin-screw extruder, extrude and pelletize to obtain masterbatch;

[0011] Step 3: After mixing and melting the color masterbatch, low-melting-point copolyester, modified copolymer and carbon nanotubes, the mixture is spun, cooled, oiled, hot-drawn, networked and then wound into a cylinder to obtain the finished product.

[0012] In this scheme, the meta-benzene ring structure of isophthalic acid and the flexible aliphatic chain of adipic acid are introduced to effectively disrupt the regularity of the polyester molecular chain and significantly reduce the crystallinity of the polymer. The reaction first involves esterification at 250°C to generate a diethyl terephthalate intermediate, followed by polycondensation under high vacuum conditions at 275°C to form a long-chain copolyester. The addition of isophthalic acid reduces the symmetry of the molecular chain, while the flexible segments of adipic acid enhance chain mobility. The synergistic effect of these two factors lowers the melting point of the copolyester from 260°C for pure PET to 110-130°C.

[0013] In a more optimized manner, the raw materials for preparing the low-melting-point copolyester include the following components: by weight, 70-80 parts terephthalic acid, 100-120 parts ethylene glycol, 20-30 parts isophthalic acid, 10-15 parts adipic acid, and 0.01-0.03 parts tetrabutyl titanate.

[0014] In a more optimized manner, the raw materials for preparing the color masterbatch include the following components: by weight, 80-100 parts of low melting point copolyester, 2-3 parts of colorant, 0.5-1 parts of dispersant, and 0.1-0.5 parts of antioxidant.

[0015] In a more optimized manner, the raw materials for preparing the finished product include the following components: by weight, 10-20 parts of color masterbatch, 70-90 parts of low-melting-point copolyester, 10-15 parts of modified copolymer, and 1-2 parts of carbon nanotubes.

[0016] In a more optimized manner, the preparation process of the modified copolymer is as follows:

[0017] S1: Dissolve 2,5-dibromo-3-hexylthiophene in anhydrous tetrahydrofuran, add butyl magnesium chloride under a protective atmosphere, stir at room temperature for 1-2 h, then add 1,3-bis(diphenylphosphine propane) nickel dichloride, continue the reaction at room temperature for 30-40 min, then add vinyl magnesium bromide, and react for another 1-2 h. Terminate the reaction with methanol, and after post-treatment, obtain intermediate A;

[0018] S2: Dissolve intermediate A in anhydrous tetrahydrofuran, add 9-boronbicyclo[3.3.1]nonane, react at 40°C for 24 h, add sodium hydroxide solution, stir for 10-15 min, then add 30% hydrogen peroxide solution, continue to react at 40°C for 24 h, terminate the reaction with methanol, and after post-treatment, obtain intermediate B;

[0019] S3: Intermediate B, 6-caprolactone, stannous octoate and xylene were mixed and reacted in an oil bath at 120°C for 48 h. The reaction was terminated with methanol. The precipitated product was dried in a vacuum oven at 40°C for 24 h to obtain the modified copolymer.

[0020] In this process, 2,5-dibromo-3-hexylthiophene generates a Grignard reagent under the action of butyl magnesium chloride. Subsequently, under the catalysis of [1,3-bis(diphenylphosphine)]nickel(II) chloride, it undergoes a coupling reaction with vinyl magnesium bromide and polymerizes to form intermediate A. Then, a hydroxyboration reaction is used to convert the terminal vinyl group of intermediate A into a hydroxyl group, i.e., intermediate B. Finally, using the terminal hydroxyl group of intermediate B as a "macromolecule initiator," the ring-opening polymerization of 6-caprolactone monomer is initiated under the catalysis of stannous octoate, thereby obtaining the modified copolymer. The structure of the modified copolymer is shown below:

[0021] ;

[0022] In a more optimized manner, the raw materials for preparing intermediate A include the following components: by weight, 7-8 parts of 2,5-dibromo-3-hexylthiophene, 25-30 parts of anhydrous tetrahydrofuran, 9-10 parts of butyl magnesium chloride, 0.2-0.3 parts of 1,3-bis(diphenylphosphine propane) nickel dichloride, and 5-6 parts of vinyl magnesium bromide.

[0023] In a more optimized manner, the raw materials for preparing intermediate B include the following components: by weight, 0.6-0.8 parts of intermediate A, 100-110 parts of anhydrous tetrahydrofuran, 8-9 parts of 9-boronbicyclo[3.3.1]nonane, 4-5 parts of sodium hydroxide solution, and 4-5 parts of 30% hydrogen peroxide solution; wherein the concentration of sodium hydroxide solution is 6 mol / L.

[0024] In a more optimized manner, the raw materials for preparing the modified copolymer include the following components: by weight, 0.5-0.6 parts intermediate B, 0.5-0.6 parts 6-caprolactone, 0.06-0.07 parts stannous octoate, and 18-20 parts xylene.

[0025] The beneficial effects of this invention are:

[0026] The modified copolymer of this invention contains flexible polycaprolactone segments formed by the ring-opening polymerization of 6-caprolactone. These segments exhibit good flexibility and polarity matching, enabling strong interfacial interactions with the irregular, highly flexible molecular structures of low-melting-point copolyesters modified by isophthalic acid (which disrupts the regularity of the molecular chain) and adipic acid (which introduces flexible aliphatic chains). This compatibility effectively reduces phase separation in the blend system, allowing the modified copolymer to be uniformly dispersed in the matrix. Furthermore, the synergistic effect between molecular chains enhances the tensile properties of the fiber, solving the problem of decreased mechanical properties caused by poor compatibility between traditional additives and the matrix.

[0027] Furthermore, the modified copolymer retains the thiophene ring aromatic conjugated unit in its molecular structure. The conjugated π bonds in this unit can form a strong π-π stacking interaction with the conjugated aromatic structure on the surface of carbon nanotubes. This non-covalent interaction effectively weakens the van der Waals forces between carbon nanotubes, breaking their aggregation tendency and significantly improving the dispersion uniformity of carbon nanotubes in the low-melting-point copolyester matrix. The uniformly dispersed carbon nanotubes can not only further enhance the mechanical strength of the fiber through bridging, but also form continuous conductive pathways, reducing the surface resistance of the fiber and improving its conductivity.

[0028] Meanwhile, the solution coloring used in this invention allows the coloring and spinning processes to proceed simultaneously, which not only enables uniform coloring of the fibers and improves color fastness, but also effectively shortens the production cycle, reduces costs, and minimizes pollution. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: A processing method for solution-dyed low-melting-point fiber material, characterized by comprising the following steps:

[0031] Step 1: Mix 70 parts terephthalic acid, 100 parts ethylene glycol, 20 parts isophthalic acid and 10 parts adipic acid, add 0.01 parts tetrabutyl titanate, react at 250℃ for 3 hours, then raise the temperature to 275℃ and react for 2.5 hours. After extrusion and pelletizing, vacuum dry to obtain a low melting point copolyester.

[0032] Step 2: Add 80 parts of low melting point copolyester, 2 parts of colorant (azo red pigment and iron oxide in a mass ratio of 2:1), 0.5 parts of dispersant (glyceryl stearate) and 0.1 parts of antioxidant (antioxidant 1010) into a twin-screw extruder, extrude and pelletize to obtain masterbatch;

[0033] Step 3: Mix and melt 10 parts of color masterbatch, 70 parts of low melting point copolyester, 10 parts of modified copolymer and 1 part of carbon nanotube, then spin, cool, oil, heat traction, network treatment and wind into a cylinder to obtain the finished product;

[0034] The preparation process of the modified copolymer is as follows:

[0035] S1: Dissolve 7 parts of 2,5-dibromo-3-hexylthiophene in 25 parts of anhydrous tetrahydrofuran. Under a protective atmosphere, add 9 parts of butyl magnesium chloride and stir at room temperature for 1 h. Then add 0.2 parts of 1,3-bis(diphenylphosphine propane) nickel dichloride and continue to react at room temperature for 30 min. Then add 5 parts of vinyl magnesium bromide and react for another 1 h. Terminate the reaction with methanol and perform post-treatment to obtain intermediate A.

[0036] S2: Dissolve 0.6 parts of intermediate A in 100 parts of anhydrous tetrahydrofuran, add 8 parts of 9-boronbicyclo[3.3.1]nonane, react at 40℃ for 24 h, add 4 parts of sodium hydroxide solution (concentration of 6 mol / L), stir for 10 min, then add 4 parts of 30% hydrogen peroxide solution, continue to react at 40℃ for 24 h, terminate the reaction with methanol, and after post-treatment, obtain intermediate B;

[0037] S3: Mix 0.5 parts of intermediate B, 0.5 parts of 6-caprolactone, 0.06 parts of stannous octoate and 18 parts of xylene, and react in an oil bath at 120°C for 48 h. Terminate the reaction with methanol, and dry the precipitated product in a vacuum oven at 40°C for 24 h to obtain the modified copolymer.

[0038] Example 2: A processing method for solution-dyed low-melting-point fiber material, characterized by comprising the following steps:

[0039] Step 1: Mix 80 parts terephthalic acid, 120 parts ethylene glycol, 30 parts isophthalic acid and 15 parts adipic acid, add 0.03 parts tetrabutyl titanate, react at 250℃ for 3 hours, then raise the temperature to 275℃ and react for 2.5 hours. After extrusion and pelletizing, vacuum dry to obtain a low melting point copolyester.

[0040] Step 2: Add 100 parts of low melting point copolyester, 3 parts of colorant (azo red pigment and iron oxide in a mass ratio of 2:1), 1 part of dispersant (glyceryl stearate) and 0.5 parts of antioxidant (antioxidant 1010) to a twin-screw extruder, extrude and pelletize to obtain masterbatch;

[0041] Step 3: Mix and melt 20 parts of color masterbatch, 90 parts of low melting point copolyester, 15 parts of modified copolymer and 2 parts of carbon nanotubes, then spin, cool, oil, heat traction, network treatment and wind into a cylinder to obtain the finished product;

[0042] The preparation process of the modified copolymer is as follows:

[0043] S1: Dissolve 8 parts of 2,5-dibromo-3-hexylthiophene in 30 parts of anhydrous tetrahydrofuran. Under a protective atmosphere, add 10 parts of butyl magnesium chloride and stir at room temperature for 2 hours. Then add 0.3 parts of 1,3-bis(diphenylphosphine propane) nickel dichloride and continue to react at room temperature for 40 minutes. Then add 6 parts of vinyl magnesium bromide and react for another 2 hours. Terminate the reaction with methanol and perform post-treatment to obtain intermediate A.

[0044] S2: Dissolve 0.8 parts of intermediate A in 110 parts of anhydrous tetrahydrofuran, add 9 parts of 9-boronbicyclo[3.3.1]nonane, react at 40℃ for 24 h, add 5 parts of sodium hydroxide solution (concentration of 6 mol / L), stir for 15 min, then add 5 parts of 30% hydrogen peroxide solution, continue to react at 40℃ for 24 h, terminate the reaction with methanol, and after post-treatment, obtain intermediate B;

[0045] S3: Mix 0.6 parts of intermediate B, 0.6 parts of 6-caprolactone, 0.07 parts of stannous octoate and 20 parts of xylene, and react in an oil bath at 120°C for 48 h. Terminate the reaction with methanol, and dry the precipitated product in a vacuum oven at 40°C for 24 h to obtain the modified copolymer.

[0046] Example 3: A processing method for solution-dyed low-melting-point fiber material, characterized by comprising the following steps:

[0047] Step 1: Mix 75 parts terephthalic acid, 110 parts ethylene glycol, 25 parts isophthalic acid and 12.5 parts adipic acid, add 0.02 parts tetrabutyl titanate, react at 250℃ for 3 hours, then raise the temperature to 275℃ and react for 2.5 hours. After extrusion and pelletizing, vacuum dry to obtain a low melting point copolyester.

[0048] Step 2: Add 90 parts of low melting point copolyester, 2.5 parts of colorant (azo red pigment and iron oxide in a mass ratio of 2:1), 0.75 parts of dispersant (glyceryl stearate) and 0.3 parts of antioxidant (antioxidant 1010) into a twin-screw extruder, extrude and pelletize to obtain masterbatch;

[0049] Step 3: Mix and melt 15 parts of color masterbatch, 80 parts of low melting point copolyester, 12.5 parts of modified copolymer and 1.5 parts of carbon nanotubes, then spin, cool, oil, heat traction, network treatment and wind into a cylinder to obtain the finished product;

[0050] The preparation process of the modified copolymer is as follows:

[0051] S1: Dissolve 7.5 parts of 2,5-dibromo-3-hexylthiophene in 27.5 parts of anhydrous tetrahydrofuran. Under a protective atmosphere, add 9.5 parts of butyl magnesium chloride and stir at room temperature for 1.5 h. Then add 0.25 parts of 1,3-bis(diphenylphosphine propane) nickel dichloride and continue to react at room temperature for 35 min. Then add 5.5 parts of vinyl magnesium bromide and react for another 1.5 h. Terminate the reaction with methanol and post-process to obtain intermediate A.

[0052] S2: Dissolve 0.7 parts of intermediate A in 105 parts of anhydrous tetrahydrofuran, add 8.5 parts of 9-boronbicyclo[3.3.1]nonane, react at 40℃ for 24 h, add 4.5 parts of sodium hydroxide solution (concentration of 6 mol / L), stir for 12.5 min, then add 4.5 parts of 30% hydrogen peroxide solution, continue to react at 40℃ for 24 h, terminate the reaction with methanol, and after post-treatment, obtain intermediate B;

[0053] S3: Mix 0.55 parts of intermediate B, 0.55 parts of 6-caprolactone, 0.065 parts of stannous octoate and 19 parts of xylene, and react in an oil bath at 120°C for 48 h. Terminate the reaction with methanol, and dry the precipitated product in a vacuum oven at 40°C for 24 h to obtain the modified copolymer.

[0054] Comparative Example 1: No modified copolymer was introduced, as follows:

[0055] A method for processing a solution-dyed low-melting-point fiber material, characterized by comprising the following steps:

[0056] Step 1: Mix 75 parts terephthalic acid, 110 parts ethylene glycol, 25 parts isophthalic acid and 12.5 parts adipic acid, add 0.02 parts tetrabutyl titanate, react at 250℃ for 3 hours, then raise the temperature to 275℃ and react for 2.5 hours. After extrusion and pelletizing, vacuum dry to obtain a low melting point copolyester.

[0057] Step 2: Add 90 parts of low melting point copolyester, 2.5 parts of colorant (azo red pigment and iron oxide in a mass ratio of 2:1), 0.75 parts of dispersant (glyceryl stearate) and 0.3 parts of antioxidant (antioxidant 1010) into a twin-screw extruder, extrude and pelletize to obtain masterbatch;

[0058] Step 3: Mix and melt 15 parts of color masterbatch, 80 parts of low melting point copolyester, and 1.5 parts of carbon nanotubes, then spin, cool, oil, heat-draw, and network-processed before winding into a cylinder to obtain the finished product.

[0059] Comparative Example 2:

[0060] Commercially available polyester fibers are used.

[0061] Testing experiment:

[0062] (1) Tensile tests were performed on the finished products obtained in the examples and comparative examples in accordance with standard GB / T3923.1-2013;

[0063] (2) The resistance of the finished products obtained in the examples and comparative examples was tested;

[0064] (3) The wash fastness of the finished products obtained in the Example and Comparative Example 1 was tested according to GB / T 3921;

[0065] The obtained data is shown in the table below:

[0066] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Fracture strength (cN / dtex) 4.8 4.7 5.0 3.2 3.0 Resistance (Ω) <![CDATA[1.8×10 4 ]]> <![CDATA[2.3×10 4 ]]> <![CDATA[1.0×10 4 ]]> <![CDATA[2.6×10 5 ]]> <![CDATA[4×10 8 ]]> Wash fastness 4-5 4-5 4-5 3-4 /

[0067] Conclusion: This invention successfully prepared a solution-dyed low-melting-point fiber material with excellent mechanical properties, electrical conductivity, and dyeing properties by introducing isophthalic acid and adipic acid to disrupt the regularity of polyester molecular chains and combining the synergistic effect of modified copolymers and carbon nanotubes.

[0068] Experimental data show that the fracture strength of Examples 1 to 3 is significantly higher than that of Comparative Examples 1 and 2, reaching 4.8 cN / dtex, 4.7 cN / dtex, and 5.0 cN / dtex, respectively, while Comparative Example 1 is only 3.2 cN / dtex and Comparative Example 2 is 3.0 cN / dtex. Regarding conductivity, the resistance values ​​of the examples (1.0 × 10⁻⁶) are significantly higher than those of Comparative Examples 1 and 2. 4 Ω to 2.3×10 4 Ω) is much lower than that of Comparative Example 1 (2.6 × 10 5 Ω) and Comparative Example 2 (4×10 8 (Ω), exhibiting excellent electrical conductivity. Furthermore, the wash fastness of the examples reached grade 4-5, superior to grade 3-4 of Comparative Example 1, indicating that solution dyeing technology can effectively improve the dyeing uniformity and color fastness of fibers.

[0069] In summary, this invention provides a low-melting-point fiber material with excellent mechanical properties, electrical conductivity, and dyeability, as well as its efficient processing method, which has significant technical advantages and broad application prospects.

[0070] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A processing method for solution-dyed low-melting-point fiber materials, characterized in that, Includes the following steps: Step 1: Mix terephthalic acid, ethylene glycol, isophthalic acid and adipic acid, add tetrabutyl titanate, react at 250℃ for 3 hours, then raise the temperature to 275℃ and react for 2.5 hours. After extrusion and pelletizing, vacuum dry to obtain low melting point copolyester. Step 2: Add low-melting-point copolyester, colorant, dispersant and antioxidant into a twin-screw extruder, extrude and pelletize to obtain masterbatch; Step 3: After mixing and melting the color masterbatch, low-melting-point copolyester, modified copolymer and carbon nanotubes, the mixture is spun, cooled, oiled, thermally drawn, networked and then wound into a cylinder to obtain the finished product; The preparation process of the modified copolymer is as follows: S1: Dissolve 2,5-dibromo-3-hexylthiophene in anhydrous tetrahydrofuran, add butyl magnesium chloride under a protective atmosphere, stir at room temperature for 1-2 h, then add 1,3-bis(diphenylphosphine propane) nickel dichloride, continue the reaction at room temperature for 30-40 min, then add vinyl magnesium bromide, and react for another 1-2 h. Terminate the reaction with methanol, and after post-treatment, obtain intermediate A; S2: Dissolve intermediate A in anhydrous tetrahydrofuran, add 9-boronbicyclo[3.3.1]nonane, react at 40°C for 24 h, add sodium hydroxide solution, stir for 10-15 min, then add 30% hydrogen peroxide solution, continue to react at 40°C for 24 h, terminate the reaction with methanol, and after post-treatment, obtain intermediate B; S3: Intermediate B, 6-caprolactone, stannous octoate and xylene were mixed and reacted in an oil bath at 120°C for 48 h. The reaction was terminated with methanol. The precipitated product was dried in a vacuum oven at 40°C for 24 h to obtain the modified copolymer.

2. The processing method for a solution-dyed low-melting-point fiber material according to claim 1, characterized in that, The raw materials for preparing the low-melting-point copolyester include the following components: by weight, 70-80 parts terephthalic acid, 100-120 parts ethylene glycol, 20-30 parts isophthalic acid, 10-15 parts adipic acid, and 0.01-0.03 parts tetrabutyl titanate.

3. The processing method for a solution-dyed low-melting-point fiber material according to claim 1, characterized in that, The raw materials for preparing the masterbatch include the following components: by weight, 80-100 parts of low melting point copolyester, 2-3 parts of colorant, 0.5-1 part of dispersant, and 0.1-0.5 parts of antioxidant.

4. The processing method for a solution-dyed low-melting-point fiber material according to claim 1, characterized in that, The raw materials for preparing the finished product include the following components: by weight, 10-20 parts color masterbatch, 70-90 parts low melting point copolyester, 10-15 parts modified copolymer, and 1-2 parts carbon nanotubes.

5. The processing method for a solution-dyed low-melting-point fiber material according to claim 1, characterized in that, The raw materials for preparing intermediate A include the following components: by weight, 7-8 parts of 2,5-dibromo-3-hexylthiophene, 25-30 parts of anhydrous tetrahydrofuran, 9-10 parts of butyl magnesium chloride, 0.2-0.3 parts of 1,3-bis(diphenylphosphine propane) nickel dichloride, and 5-6 parts of vinyl magnesium bromide.

6. The processing method of a solution-dyed low-melting-point fiber material according to claim 1, characterized in that, The raw materials for preparing intermediate B include the following components: by weight, 0.6-0.8 parts intermediate A, 100-110 parts anhydrous tetrahydrofuran, 8-9 parts 9-boronbicyclo[3.3.1]nonane, 4-5 parts sodium hydroxide solution, and 4-5 parts 30% hydrogen peroxide solution; wherein the concentration of sodium hydroxide solution is 6 mol / L.

7. The processing method for a solution-dyed low-melting-point fiber material according to claim 1, characterized in that, The raw materials for preparing the modified copolymer include the following components: by weight, 0.5-0.6 parts intermediate B, 0.5-0.6 parts 6-caprolactone, 0.06-0.07 parts stannous octoate, and 18-20 parts xylene.

8. The finished product obtained by the processing method of a solution-dyed low-melting-point fiber material according to any one of claims 1-7.