Stock solution colored low-melting-point fiber material and processing method

Abstract

The invention discloses a dope-dyed low-melting-point fiber material and a processing method thereof. Comprising the following steps: step 1, mixing terephthalic acid, ethylene glycol, isophthalic acid and adipic acid, adding tetrabutyl titanate, reacting at 250 DEG C for 3 hours, then raising the temperature to 275 DEG C, reacting for 2.5 hours, extruding and pelletizing, and drying in vacuum to obtain low-melting-point copolyester; 2, adding the low-melting-point copolyester, the coloring agent, the dispersing agent and the antioxidant into a double-screw extruder, extruding and pelletizing to obtain color master batches; and 3, mixing and melting the color master batch, the low-melting-point copolyester, the modified copolymer and the carbon nano tube, performing spinning, cooling, oiling, thermal traction and network treatment, and winding into a barrel to obtain a finished product. The preparation method has the beneficial effects that the regularity of a polyester molecular chain is destroyed by introducing isophthalic acid and adipic acid, and meanwhile, the mechanical property and the conductivity of the fiber are improved through the synergistic effect of the modified copolymer and the carbon nanotubes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of chemical fibers, and specifically relates to a dope dyeing low-melting-point fiber material and a processing method. BACKGROUND

[0002] With the development of the textile industry and the increasing demand of consumers for the functional diversification of textiles, fiber materials with special properties have attracted widespread attention. Low-melting-point fiber materials have important applications in non-woven fabrics, composite materials and other fields. For example, in the production of non-woven fabrics, low-melting-point fibers can be used as bonding fibers. By heating, the low-melting-point fibers melt and bond other fibers together to form non-woven fabric products with 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 hand feeling. Traditional fiber dyeing methods are mostly post-dyeing processes, that is, dyeing treatment is performed after the fiber or fabric is formed. However, the post-dyeing process has many drawbacks, such as complex process flow, large water consumption, and use of a large amount of chemical auxiliaries in the dyeing process which can easily cause environmental pollution. In addition, for some special fibers, post-dyeing is difficult to achieve ideal dyeing effect, and the color fastness is poor. Dope dyeing technology, as an advanced fiber dyeing method, has gradually attracted attention. Dope dyeing is a process in which a colorant is added to the polymer melt or solution during the fiber production process, and then colored fibers are directly produced through mixing, spinning and other processes. This method synchronizes the dyeing and spinning processes, which not only enables uniform dyeing of the fibers and improves color fastness, but also effectively shortens the production cycle, reduces costs and reduces pollution. However, there are still some problems to be solved in the preparation and processing of dope dyeing low-melting-point fiber materials. On the one hand, the melting point of low-melting-point fibers is not accurately controlled, which leads to unstable bonding properties of the fibers during processing, affecting the quality of the final product. On the other hand, the compatibility of the colorant with the low-melting-point polymer matrix is poor, which can easily cause uneven dispersion of the colorant, resulting in poor color consistency of the fibers and possibly adversely affecting the physical and mechanical properties of the fibers.

[0003] Therefore, it is of great practical significance to develop a preparation and processing method for dope dyeing low-melting-point fiber materials that can accurately control the melting point, ensure uniform dispersion of the colorant and have good physical and mechanical properties. SUMMARY

[0004] The present application aims to overcome the defects of the prior art and provides a dope dyeing low-melting-point fiber material and a processing method.

[0005] The object of the present application can be achieved by the following technical solutions: A processing method of a dope dyeing low-melting-point fiber material, comprising the following steps: Step 1: mixing terephthalic acid, ethylene glycol, isophthalic acid and adipic acid, adding tetrabutyl titanate, reacting at 250℃ for 3h, then increasing the temperature to 275℃, reacting for 2.5h, after extruding and granulating, vacuum drying, obtaining low-melting copolyester; Step 2: adding low-melting copolyester, colorant, dispersant and antioxidant into a double-screw extruder, extruding and granulating, obtaining color masterbatch; Step 3: mixing and melting color masterbatch, low-melting copolyester, modified copolymer and carbon nanotube, after spinning, cooling, oiling, hot traction, network processing, winding into a cylinder, obtaining finished product.

[0006] In the scheme, by introducing the meta-benzene ring structure of isophthalic acid and the flexible aliphatic chain of adipic acid, the regularity of polyester molecular chain is effectively destroyed, and the crystallization ability of the polymer is significantly reduced. The reaction first esterifies at 250℃ to generate bis-hydroxyethyl terephthalate intermediate, and then polycondenses into long-chain copolyester under high vacuum at 275℃. The addition of isophthalic acid reduces the symmetry of the molecular chain, and the flexible segment of adipic acid enhances the chain segment mobility. The synergistic effect of the two reduces the melting point of the copolyester from 260℃ of pure PET to 110-130℃.

[0007] More preferably, the raw materials for preparing the low-melting copolyester include the following components: 70-80 parts of terephthalic acid, 100-120 parts of ethylene glycol, 20-30 parts of isophthalic acid, 10-15 parts of adipic acid, and 0.01-0.03 parts of tetrabutyl titanate.

[0008] More preferably, the raw materials for preparing the color masterbatch include the following components: 80-100 parts of low-melting copolyester, 2-3 parts of colorant, 0.5-1 part of dispersant, and 0.1-0.5 part of antioxidant.

[0009] More preferably, the raw materials for preparing the finished product include the following components: 10-20 parts of color masterbatch, 70-90 parts of low-melting copolyester, 10-15 parts of modified copolymer, and 1-2 parts of carbon nanotube.

[0010] More preferably, the preparation process of the modified copolymer is as follows: S1: dissolving 2,5-dibromo-3-hexylthiophene in anhydrous tetrahydrofuran, adding butylmagnesium chloride under a protective atmosphere, stirring at room temperature for 1-2h, then adding 1,3-bis(diphenylphosphine propane) nickel dichloride, continuing to react at room temperature for 30-40min, then adding vinylmagnesium bromide, reacting for 1-2h, terminating the reaction with methanol, and obtaining intermediate A after post-treatment; S2: intermediate A is dissolved in anhydrous tetrahydrofuran, 9-borabicyclo[3.3.1]nonane is added, and the reaction is carried out at 40℃ for 24h, sodium hydroxide solution is added, stirred for 10-15min, then 30% hydrogen peroxide solution is added, and the reaction is continued at 40℃ for 24h, the reaction is terminated with methanol, and the product is precipitated and dried in a vacuum oven at 40℃ for 24h to obtain intermediate B; S3: intermediate B, 6-caprolactone, stannous octoate and dimethylbenzene are mixed, and the reaction is carried out in an oil bath at 120℃ for 48h, the reaction is terminated with methanol, and the precipitated product is dried in a vacuum oven at 40℃ for 24h to obtain the modified copolymer.

[0011] In the scheme, 2,5-dibromo-3-hexylthiophene is converted into Grignard reagent under the action of butylmagnesium chloride, then coupled with vinylmagnesium bromide under the catalysis of [1,3-bis(diphenylphosphinopropane)] dichloronickel(II), and polymerized to form intermediate A; then the terminal vinyl group of intermediate A is converted into hydroxyl group by hydroboration to obtain intermediate B; finally, the hydroxyl group at the terminal of intermediate B is used as a "macromolecular initiator" to initiate ring-opening polymerization of 6-caprolactone monomer under the catalysis of stannous octoate, so as to obtain the modified copolymer. The structure of the modified copolymer is shown as follows: More preferably, the raw materials for preparing the intermediate A include the following components: 7-8 parts of 2,5-dibromo-3-hexylthiophene, 25-30 parts of anhydrous tetrahydrofuran, 9-10 parts of butylmagnesium chloride, 0.2-0.3 parts of 1,3-bis(diphenylphosphinopropane) dichloronickel, and 5-6 parts of vinylmagnesium bromide.

[0012] More preferably, the raw materials for preparing the intermediate B include the following components: 0.6-0.8 parts of intermediate A, 100-110 parts of anhydrous tetrahydrofuran, 8-9 parts of 9-borabicyclo[3.3.1]nonane, 4-5 parts of sodium hydroxide solution, and 4-5 parts of 30% hydrogen peroxide solution; wherein the concentration of the sodium hydroxide solution is 6mol / L.

[0013] More preferably, the raw materials for preparing the modified copolymer include the following components: 0.5-0.6 parts of intermediate B, 0.5-0.6 parts of 6-caprolactone, 0.06-0.07 parts of stannous octoate, and 18-20 parts of dimethylbenzene.

[0014] The beneficial effects of the present application are as follows: The modified copolymer contains a polycaprolactone flexible segment formed by ring-opening polymerization of 6-caprolactone in the molecular chain, which has good flexibility and polarity matching, and can produce strong interfacial interaction with the non-regular and high-flexible molecular structure formed by modification of isophthalic acid (which destroys the regularity of the molecular chain) and adipic acid (which introduces flexible aliphatic chains) in the low-melting copolyester. This compatibility effectively reduces the phase separation phenomenon in the blending system, so that the modified copolymer is uniformly dispersed in the matrix, and the tensile properties of the fiber are improved through the synergistic effect of the molecular chains, solving the problem of mechanical property decline caused by poor compatibility between traditional additives and the matrix.

[0015] In addition, the modified copolymer retains the thienyl ring aromatic conjugated unit in the molecular structure, which contains conjugated π bonds that can form strong π-π stacking interactions with the conjugated aromatic structure on the surface of carbon nanotubes. This non-covalent interaction can effectively weaken the van der Waals force between carbon nanotubes, break their agglomeration tendency, and significantly improve the uniformity of the dispersion of carbon nanotubes in the low-melting copolyester matrix. Uniformly dispersed carbon nanotubes not only can further enhance the mechanical strength of the fiber through bridging, but also can form a continuous conductive path, reduce the surface resistance of the fiber, and improve its electrical conductivity.

[0016] At the same time, the dope coloring used in the present application synchronizes the coloring and spinning processes, which not only can realize uniform coloring of the fiber and improve color fastness, but also can effectively shorten the production cycle, reduce costs and reduce pollution. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0018] Embodiment one: a processing method of dope-colored low-melting fiber material, characterized in that it comprises the following steps: Step 1: mix 70 parts of terephthalic acid, 100 parts of ethylene glycol, 20 parts of isophthalic acid and 10 parts of adipic acid, add 0.01 parts of tetrabutyl titanate, react at 250℃ for 3h, then increase the temperature to 275℃, react for 2.5h, extrude and cut into particles, and then vacuum dry to obtain a low-melting copolyester; Step 2: add 80 parts of low-melting copolyester, 2 parts of colorant (azo red pigment and iron oxide with a mass ratio of 2:1), 0.5 parts of dispersant (glyceryl stearate) and 0.1 parts of antioxidant (antioxidant 1010) into a double-screw extruder, extrude and cut into particles to obtain a color masterbatch; Step 3: After the 10 parts of color masterbatch, 70 parts of low-melting copolyester, 10 parts of modified copolymer and 1 part of carbon nanotube are mixed and melted, they are spun, cooled, oiled, hot-drawn, networked and wound into a cylinder to obtain the finished product; The preparation process of the modified copolymer is as follows: S1: 7 parts of 2,5-dibromo-3-hexylthiophene were dissolved in 25 parts of anhydrous tetrahydrofuran, 9 parts of butylmagnesium chloride were added under a protective atmosphere, stirred at room temperature for 1 h, then 0.2 parts of 1,3-bis(diphenylphosphine propane) nickel dichloride were added, and the reaction was continued at room temperature for 30 min, then 5 parts of vinylmagnesium bromide were added, and the reaction was continued for 1 h. The reaction was terminated with methanol, and the intermediate A was obtained after work-up; S2: 0.6 parts of intermediate A were dissolved in 100 parts of anhydrous tetrahydrofuran, 8 parts of 9-borabicyclo[3.3.1]nonane were added, and the reaction was carried out at 40°C for 24 h. 4 parts of sodium hydroxide solution (concentration of 6 mol / L) were added, stirred for 10 min, then 4 parts of 30% hydrogen peroxide solution were added, and the reaction was continued at 40°C for 24 h. The reaction was terminated with methanol, and the intermediate B was obtained after work-up; S3: 0.5 parts of intermediate B, 0.5 parts of 6-hexalactone, 0.06 parts of stannous octoate and 18 parts of xylene were mixed and reacted in an oil bath at 120°C for 48 h. The reaction was terminated with methanol, and the precipitated product was dried in a vacuum oven at 40°C for 24 h to obtain the modified copolymer.

[0019] Example 2: A processing method of a stock solution colored low-melting fiber material, characterized in that it comprises the following steps: Step 1: 80 parts of terephthalic acid, 120 parts of ethylene glycol, 30 parts of isophthalic acid and 15 parts of adipic acid were mixed, 0.03 parts of tetrabutyl titanate were added, and the reaction was carried out at 250°C for 3 h. Then the temperature was increased to 275°C, and the reaction was carried out for 2.5 h. After extrusion and granulation, vacuum drying was carried out to obtain a low-melting copolyester; Step 2: 100 parts of low-melting copolyester, 3 parts of colorant (azo red pigment and iron oxide with a mass ratio of 2:1), 1 part of dispersant (glyceryl stearate) and 0.5 parts of antioxidant (antioxidant 1010) were added into a twin-screw extruder, extruded and granulated to obtain a color masterbatch; Step 3: After the 10 parts of color masterbatch, 70 parts of low-melting copolyester, 10 parts of modified copolymer and 1 part of carbon nanotube are mixed and melted, they are spun, cooled, oiled, hot-drawn, networked and wound into a cylinder to obtain the finished product; The preparation process of the modified copolymer is as follows: S1: 8 parts of 2,5-dibromo-3-hexylthiophene were dissolved in 30 parts of anhydrous tetrahydrofuran, 10 parts of butylmagnesium chloride was added under a protective atmosphere, stirred at room temperature for 2 h, then 0.3 parts of 1,3-bis(diphenylphosphinopropane) nickel dichloride was added, and the reaction was continued at room temperature for 40 min, then 6 parts of vinylmagnesium bromide was added, and the reaction was continued for 2 h, and the reaction was terminated with methanol, and after treatment, intermediate A was obtained; S2: 0.8 parts of intermediate A were dissolved in 110 parts of anhydrous tetrahydrofuran, 9 parts of 9-borabicyclo[3.3.1]nonane was added, and the reaction was carried out at 40℃ for 24 h, 5 parts of sodium hydroxide solution (concentration of 6 mol / L) was added, stirred for 15 min, then 5 parts of 30% hydrogen peroxide solution was added, and the reaction was continued at 40℃ for 24 h, the reaction was terminated with methanol, and after treatment, intermediate B was obtained; S3: 0.6 parts of intermediate B, 0.6 parts of 6-hexalactone, 0.07 parts of stannous octoate and 20 parts of xylene were mixed, and the reaction was carried out in an oil bath at 120℃ for 48 h, the reaction was terminated with methanol, and the precipitated product was dried in a vacuum oven at 40℃ for 24 h to obtain the modified copolymer.

[0020] Example three: a processing method of a stock solution colored low melting point fiber material, characterized in that it comprises the following steps: Step 1: 75 parts of terephthalic acid, 110 parts of ethylene glycol, 25 parts of isophthalic acid and 12.5 parts of adipic acid were mixed, 0.02 parts of tetrabutyl titanate was added, the reaction was carried out at 250℃ for 3 h, then the temperature was increased to 275℃, and the reaction was carried out for 2.5 h, after extrusion and granulation, vacuum drying was carried out to obtain a low melting point copolyester; Step 2: 90 parts of low melting point copolyester, 2.5 parts of colorant (azo red pigment and iron oxide with a mass ratio of 2:1), 0.75 parts of dispersant (glyceryl stearate) and 0.3 parts of antioxidant (antioxidant 1010) were added into a twin-screw extruder, extruded and granulated to obtain a color master batch; Step 3: 15 parts of color master batch, 80 parts of low melting point copolyester, 12.5 parts of modified copolymer and 1.5 parts of carbon nanotube were mixed and melted, then spun, cooled, oiled, hot drawn, network treated and wound into a cylinder to obtain a finished product; The preparation process of the modified copolymer is as follows: S1: 7.5 parts of 2,5-dibromo-3-hexylthiophene was dissolved in 27.5 parts of anhydrous tetrahydrofuran, 9.5 parts of butylmagnesium chloride was added under a protective atmosphere, stirred at room temperature for 1.5 h, then 0.25 parts of 1,3-bis(diphenylphosphinopropane) nickel dichloride was added, and the reaction was continued at room temperature for 35 min, then 5.5 parts of vinylmagnesium bromide was added, and the reaction was continued for 1.5 h, and the reaction was terminated with methanol, and after treatment, intermediate A was obtained; 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; 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.

[0021] Comparative Example 1: No modified copolymer was introduced, as follows: A method for processing a solution-dyed low-melting-point fiber material, characterized by comprising the following steps: 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. 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; 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.

[0022] Comparative Example 2: Commercially available polyester fibers are used.

[0023] Testing experiment: (1) Tensile tests were performed on the finished products obtained in the examples and comparative examples in accordance with standard GB / T3923.1-2013; (2) The resistance of the finished products obtained in the examples and comparative examples was tested; (3) The wash fastness of the finished products obtained in the Example and Comparative Example 1 was tested according to GB / T 3921; The obtained data is shown in the table below: Item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Breaking strength (cN / dtex) 4.8 4.7 5.0 3.2 3.0 Resistance (Ω) 1.8 x 10 4 ]]> 2.3 x 10 4 ]]> 1.0 x 10 4 ]]> 2.6 x 10 5 ]] 4 x 10 8 ]] Fastness to washing color 4-5 4-5 4-5 3-4 / 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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, hot-drawn, networked and then wound into a cylinder to obtain the finished product.

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 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.

6. The processing method for a solution-dyed low-melting-point fiber material according to claim 5, 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.

7. The processing method for a solution-dyed low-melting-point fiber material according to claim 5, 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.

8. The processing method of a solution-dyed low-melting-point fiber material according to claim 5, 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.

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

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