Colorful color-changing spandex fiber and preparation method thereof

Abstract

The invention relates to a colorful color-changing spandex fiber and a preparation method thereof, the colorful color-changing spandex fiber at least contains a first color-changing component and a second color-changing component which are mutually connected but not fused, and a clear boundary exists between the first color-changing component and the second color-changing component on the cross section of the spandex fiber; and the cross section is a parallel cross section of the first color-changing component and the second color-changing component. The preparation method of the colorful color-changing spandex fiber at least comprises the steps that the first color-changing component and the second color-changing component serve as spinning raw materials, and the colorful color-changing spandex fiber is obtained through dry spinning by means of a parallel spinning assembly in the presence of a solvent; the parallel spinneret assembly comprises a spinneret plate, at least one spinneret orifice is formed in the spinneret plate, and each spinneret orifice at least comprises two groups of independent first spinneret pipelines and second spinneret pipelines; the spandex fiber monofilament has a colorful color-changing effect, the interface is clear after the color of the fiber is changed, and a boundary area with mixed colors does not appear.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane elastic fibers, and relates to a multi-color changing spandex fiber and a preparation method thereof. Background Art

[0002] Spandex is the abbreviation of polyurethane urea elastic fiber (Polyurethane), and is a polyurethane elastic fiber containing more than 85% urethane groups and having a linear molecular chain structure. Spandex fibers have excellent properties such as high elongation at break and high elastic recovery rate, and are thus widely used in elastic fabrics and extended to applications in the medical, sports and other fields. In modern society, in addition to warmth retention, functionality and personalization of clothing are also increasingly favored by people. In some special scenarios, such as the need to adjust the color of clothing according to the environment during performances, and the need for camouflage during outdoor activities, the demand for clothing that can change color is also indispensable. At present, there are already many public materials that can prepare color-changing spandex fibers, but there is no preparation method applicable to dry spinning. The reported color-changing spandex fibers are roughly divided into photochromic, thermochromic and force-sensitive color-changing, etc., but they cannot maintain the natural color of ordinary spandex before color change, that is, colorless or white, and spandex generally presents a single color when excited to change color, and cannot present multi-colors. Summary of the Invention

[0003] Technical Problem: The present invention provides a multi-color changing spandex fiber and a preparation method thereof, which are used to realize the color-changing function of spandex fibers and solve the problem of single color. It can achieve the effect of multi-color changing on a single filament of spandex fiber, and the interface is clear after the fiber changes color, without the appearance of a boundary area with color mixing; in addition, the mechanical properties of the multi-color changing spandex after adding color-changing additives do not decrease significantly, meeting the requirements of downstream processing and use.

[0004] Technical Solution: A multi-color changing spandex fiber of the present invention at least contains a first color-changing component and a second color-changing component that are connected to each other but not fused, and there is a clear boundary between the first color-changing component and the second color-changing component on the cross-section of the spandex fiber.

[0005] The first color-changing component and the second color-changing component extend side by side along the axial direction of the spandex fiber. On the cross-section of the spandex fiber, the first color-changing component occupies a part of the interior and the outer periphery of the cross-section, and the second color-changing component occupies the remaining part of the interior and the outer periphery of the cross-section. The mass ratio of the first color-changing component to the second color-changing component is 1:9 to 9:1.

[0006] The first color-changing component includes a first polyurethane-urea and a first color-changing additive, and the mass content of the first color-changing additive is 0.05% to 3%, calculated based on the total mass of the first color-changing component;

[0007] The second color-changing component described above includes a second polyurethane-urea and a second color-changing aid; the mass content of the second color-changing aid is 0.05% to 3%, calculated based on the total mass of the second color-changing component.

[0008] The first color-changing aid and the second color-changing aid described above each independently include a photochromic material; the photochromic material includes at least one of azobenzene-based, spiropyran-based, and spirooxazine-based photochromic materials, preferably spirooxazine-based photochromic materials;

[0009] The photochromic material does not change color under conditions without sunlight or ultraviolet light, and changes color under sunlight or ultraviolet light conditions; after the first color-changing aid and the second color-changing aid change color under sunlight or ultraviolet light conditions, the colors after color change are inconsistent.

[0010] The first polyurethane-urea and the second polyurethane-urea each independently include the reaction product of a polymer polyol, a polyisocyanate, a diamine chain extender, and a terminator;

[0011] The polymer polyol includes a polyester polyol and / or a polyether polyol, and the polyether polyol includes one or more of polytetrahydrofuran diol, polyethylene glycol, or polypropylene glycol; the number average molecular weight of the polymer polyol is 1000 to 5000 g / mol;

[0012] The polyisocyanate includes one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dimethylbiphenyl diisocyanate, naphthalene diisocyanate, p-phenylene diisocyanate, dicyclohexylmethane diisocyanate, and / or derivatives and / or modified polymers.

[0013] The diamine chain extender includes one or more of ethylenediamine, propylenediamine, 2-methyl-1,5-pentanediamine, pentanediamine, and hexamethylenediamine; the terminator includes one or more of dimethylamine, diethylamine, dipropylamine, n-butanol, and ethanolamine.

[0014] In the preparation method of the colorful color-changing spandex fiber of the present invention, at least the first color-changing component and the second color-changing component described above are used as spinning raw materials, and in the presence of a solvent, they are respectively obtained by dry spinning through a side-by-side spinneret assembly; the side-by-side spinneret assembly includes a spinneret plate, and at least one spinneret hole is provided on the spinneret plate, and each spinneret hole includes at least 2 groups of independent first spinneret pipes and second spinneret pipes.

[0015] The first spinneret pipe sequentially includes a first feed port, a first delivery pipe, and a first discharge port, and the second spinneret pipe sequentially includes a second feed port, a second delivery pipe, and a second discharge port;

[0016] The first discharge port and the second discharge port are isolated from each other, and the closest distance between the outer perimeters at the outlets of the first discharge port and the second discharge port is 2 - 5 mm;

[0017] The included angle θ between the first spinning pipe and the second spinning pipe is 5 - 30°.

[0018] Beneficial effects: A kind of colorful and color - changing spandex fiber of the present invention can achieve the effect of presenting colorful and color - changing on the same spandex fiber monofilament, and after the fiber changes color, the interface is clear without a boundary area where colors are mixed; in addition, the mechanical properties of the colorful and color - changing spandex after adding the color - changing auxiliary do not decrease significantly, meeting the requirements of downstream processing and use. Description of the Drawings

[0019] Figure 1 It is a schematic cross - sectional view of the colorful and color - changing spandex fiber in Example 1 of this application.

[0020] Figure 2 It is a schematic view of a spinneret hole in Example 1 of this application.

[0021] Figure 3 It is a schematic view of a spinneret hole in Comparative Example 4 of this application.

[0022] In the figure: the first color - changing component 1, the second color - changing component 2, the first feed port 3, the second feed port 4, the first conveying pipe 5, the second conveying pipe 6, the first discharge port 7, the second discharge port 8, the first spinning pipe 9, the second spinning pipe 10, the common discharge port 11, and the included angle θ between the first spinning pipe and the second spinning pipe. Detailed Embodiments

[0023] The technical solutions of the present invention will be further described below according to specific embodiments. The protection scope of the present invention is not limited to the following embodiments, and these examples are listed only for illustrative purposes and do not limit the present invention in any way.

[0024] The colorful and color - changing spandex fiber of the present invention contains at least a first color - changing component and a second color - changing component that are connected to each other but not mutually soluble, and there is a clear boundary between the first color - changing component and the second color - changing component on the cross - section of the spandex fiber.

[0025] In the description of the present invention, "clear boundary" means that after the fiber changes color under sunlight or ultraviolet light, on the cross - section observed by the naked eye, there is no color - mixing area formed by the contact of the first color - changing component and the second color - changing component (or the third color - changing component, the fourth color - changing component, etc.);

[0026] In the description of the present invention, the terms "one", "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] The described first color-changing component and second color-changing component extend side by side along the axial direction of the spandex fiber. In the cross-section of the spandex fiber, the first color-changing component occupies a part of the interior and the outer periphery of the cross-section, and the second color-changing component occupies the remaining part of the interior and the outer periphery of the cross-section. The mass ratio of the first color-changing component to the second color-changing component is 1:9 to 9:1. The described cross-section is a side-by-side type cross-section;

[0028] In the description of the present invention, "side-by-side type" means that there are different color-changing components in the cross-section of the fiber, and any color-changing component does not surround other color-changing components and occupies a part of the outer periphery of the fiber; after the fiber changes color under sunlight or ultraviolet light conditions, at least two colors can be observed on the longitudinal surface of the fiber with the naked eye.

[0029] Further, in some examples of the present invention, the described colorful color-changing spandex fiber is white under the condition of no sunlight or no ultraviolet light;

[0030] The mass ratio of the described first color-changing component to the second color-changing component is 1:9 to 9:1;

[0031] The first color-changing component includes a first polyurethane-urea and a first color-changing aid, and the second color-changing component includes a second polyurethane-urea and a second color-changing aid;

[0032] The mass content of the described first color-changing aid is 0.05% to 3%, calculated based on the total mass of the first color-changing component;

[0033] The mass content of the described second color-changing aid is 0.05% to 3%, calculated based on the total mass of the second color-changing component;

[0034] The second color-changing aid and the second color-changing aid each independently include a photochromic material;

[0035] In some examples of the present invention, the described photochromic material can be added in the form of powder particles or in the form of microcapsules containing the described photochromic material;

[0036] The average particle size of the described microcapsules is 1 to 10 μm;

[0037] The photochromic material includes at least one of azobenzene-based, spiropyran-based, and spirooxazine-based photochromic materials, and preferably spirooxazine-based photochromic materials;

[0038] The commercially available photochromic material products described above include one of Ranbar Red GS1610 (red), Ranbar Yellow GS3080 (yellow), Ranbar Black GS0865 (black), Ranbar Blue GS5030 (dark blue), Ranbar Violet GS6020 (magenta), Ranbar Green GS4010 (green), and Ranbar GS7030 (brown);

[0039] Alternatively, the photochromic materials described above include at least one of 3,3-diphenyl-3H-naphtho[2,1-b]pyran (daffodil yellow, CAS No.: 4222-20-2), 5-chloro-1,3,3-trimethyl-6'-piperidyl spiro[indoline-2,3'-[3H]naphtho[2,1-b]oxazine] (magenta, CAS No.: 144582-55-8), 6'-(2,3-dihydro-1H-indol-1-yl)-1,3,3-trimethyl-1,3-dihydrospiro[indoline-2,3'-naphtho[2,1-b][1,4]oxazine] (navy blue, CAS No.: 114747-44-3), and 1,3,3-trimethyl-6-piperidyl spiro[indoline-2,3-3H-naphtho[2,1-b][1,4]]oxazine (violet, CAS No.: 114747-45-4);

[0040] The photochromic materials do not change color under conditions without sunlight or ultraviolet light, and change color under sunlight or ultraviolet light conditions;

[0041] Furthermore, after the second color-changing auxiliary and the second color-changing auxiliary change color under sunlight or ultraviolet light conditions, the colors after color change are inconsistent;

[0042] The first polyurethane-urea and the second polyurethane-urea each independently include the reaction products of polymer polyols, polyisocyanates, diamine chain extenders, and terminators;

[0043] The polymer polyols include polyester polyols and / or polyether polyols. The polyether polyols include one or more of polytetrahydrofuran diol, polyethylene glycol, or polypropylene glycol. The number-average molecular weight of the polymer polyols is 1000 - 5000 g / mol.

[0044] The polyisocyanates include one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dimethylbiphenyl diisocyanate, naphthalene diisocyanate, p-phenylene diisocyanate, dicyclohexylmethane diisocyanate, and / or derivatives and / or modified polymers.

[0045] The diamine chain extender described above includes one or more of ethylenediamine, propylenediamine, 2-methyl-1,5-pentanediamine, pentanediamine, and hexamethylenediamine; the terminator includes one or more of dimethylamine, diethylamine, dipropylamine, n-butanol, and ethanolamine.

[0046] In the present invention, the polyurethane-urea is obtained through preparation techniques well-known in the art. For example, in the presence of a solvent, a polymer polyol and a polyisocyanate are reacted under the condition of excess isocyanate to synthesize a prepolymer with terminal isocyanate groups. Then, in the presence of a solvent, it is further reacted with a diamine chain extender and a terminator that are reactive to isocyanate groups to obtain it.

[0047] Among them, the polyol includes polyether polyol, such as hydroxyl-terminated polytetrahydrofuran polyol (PTMEG).

[0048] The polyisocyanate includes diphenylmethane diisocyanate (MDI) and its isomers and / or derivatives and / or modified polymers, such as 4,4'-diphenylmethane diisocyanate (4,4'-MDI).

[0049] The diamine chain extender includes small molecule diamines, such as ethylenediamine.

[0050] The terminator includes small molecule monoamines, such as diethylamine.

[0051] The solvent includes dimethylacetamide (DMAc).

[0052] The preparation method of the colorful color-changing spandex fiber described above uses at least the first color-changing component and the second color-changing component described above as spinning raw materials, and in the presence of a solvent, respectively passes through a side-by-side spinneret assembly and is obtained by dry spinning.

[0053] The side-by-side spinneret assembly described above contains a spinneret plate, and at least one spinneret hole is provided on the spinneret plate. The spinneret hole includes at least 2 groups of independent first spinneret pipes and second spinneret pipes (or third spinneret pipes, fourth spinneret pipes, etc.).

[0054] Furthermore, the first spinneret pipe sequentially includes a first feed port, a first delivery pipe, and a first discharge port, and the second spinneret pipe sequentially includes a second feed port, a second delivery pipe, and a second discharge port.

[0055] The first discharge port and the second discharge port are isolated from each other. Furthermore, the distance between the first discharge port and the second discharge port is 2 to 5 mm.

[0056] In the description of the present invention, the "distance between the first discharge port and the second discharge port" refers to the distance between the two closest points on the outer perimeters of the two discharge ports.

[0057] The included angle θ between the first spinning pipeline and the second delivery pipe is 5 to 30°.

[0058] The method for preparing the multicolored color-changing spandex fiber includes at least using the first color-changing component and the second color-changing component as spinning raw materials, and obtaining them by dry spinning through a side-by-side spinning component in the presence of a solvent; the side-by-side spinning component contains a spinneret plate, and at least one spinneret hole is provided on the spinneret plate, and each spinneret hole includes at least 2 groups of independent first spinning pipelines and second spinning pipelines.

[0059] As an example, in some examples of the present invention, the method for preparing the multicolored color-changing spandex fiber containing two color-changing components includes the following steps:

[0060] (1) The first polyurethane-urea and the first color-changing auxiliary are mixed in the presence of a solvent to obtain a spinning dope containing the first color-changing component; the second polyurethane-urea and the second color-changing auxiliary are mixed in the presence of a solvent to obtain a spinning dope containing the second color-changing component;

[0061] (2) The spinning dope of the first color-changing component and the spinning dope of the second color-changing component obtained in step (1) are respectively spun through a side-by-side spinning component to obtain the multicolored color-changing spandex fiber;

[0062] Preferably, before spinning, the spinning dope containing the first color-changing component and the spinning dope containing the second color-changing component can be aged, the aging temperature is 40°C, and the aging time is 10 to 40 hours;

[0063] Preferably, the spinning in step (2) is dry spinning;

[0064] Preferably, the dry spinning in step (2) includes steps such as spinneret stretching and high-temperature drying to obtain fibers, and then obtaining the multicolored color-changing spandex fiber through steps such as oiling with an oil agent and winding and forming.

[0065] Optionally, other common functional auxiliaries in the art can be added to the spinning dope containing the first color-changing component and / or the spinning dope containing the second color-changing component. There are no special requirements for the addition amount of the auxiliaries as long as the product performance is not deteriorated, such as one or more of a dyeing auxiliary, an antioxidant, a lubricant, a chlorine-resistant auxiliary, and a cohesion auxiliary lubricant;

[0066] In some examples of the present invention, no ultraviolet absorber is added or a small amount of light stabilizer that does not affect the effect of the photochromic auxiliary is added.

[0067] In some other examples of the present invention, multi-color changing spandex fibers containing more than two types can be prepared according to requirements. For example, three, four, five, and so on; the spinnerets are provided with spinneret holes, which include multiple groups of independent spinning ducts according to the number of fiber color-changing components, such as 3 groups, 4 groups, 5 groups, and so on.

[0068] The following examples are used to describe the production process of the present invention in detail, but these examples should not be construed as limiting the present invention in any sense.

[0069] Preparation of polyurethane-urea:

[0070] Polytetrahydrofuran glycol ((PTMEG, number average molecular weight of 1800 g / mol) was mixed with diphenylmethane diisocyanate (MDI) and reacted at 75 °C for 2 hours to obtain a polyurethane prepolymer mixture with an NCO mass content of 2.63%; the polyurethane prepolymer mixture was dissolved in an N,N-dimethylacetamide (DMAc) solution, and a DMAc mixed amine solution containing ethylenediamine and diethylamine with a molar ratio of 13:1 was added for reaction. The molar ratio of NCO in the prepolymer mixture to the reactive groups for NCO in the mixed amine was controlled to be 1.02 to obtain a 35% polyurethane-urea solution by mass concentration;

[0071] In the examples and comparative examples of the present invention, the first polyurethane-urea and the second polyurethane-urea both used this polyurethane-urea.

[0072] Example 1:

[0073] (1) The first polyurethane-urea and the first color-changing aid were mixed in the presence of the solvent DMAc to obtain a spinning dope with a mass concentration of 35% containing the first color-changing component; the second polyurethane-urea and the second color-changing aid were mixed in the presence of the solvent DMAc to obtain a spinning dope with a mass concentration of 35% containing the second color-changing component;

[0074] (2) After the spinning dope of the first color-changing component and the spinning dope of the second color-changing component obtained in step (1) were aged, they were respectively subjected to dry spinning through a side-by-side spinneret assembly, and fibers were obtained through spinning stretching and high-temperature drying steps, and then multi-color changing spandex fibers were obtained through oiling and winding.

[0075] Examples 1-6 adopted the same preparation method. The first color-changing component and the second color-changing component are specifically shown in Table 1 below:

[0076] Example 7:

[0077] (1) The first polyurethane-urea and the first color-changing auxiliary are mixed in the presence of the solvent DMAc to obtain a spinning dope with a mass concentration of 35% containing the first color-changing component; the second polyurethane-urea and the second color-changing auxiliary are mixed in the presence of the solvent DMAc to obtain a spinning dope with a mass concentration of 35% containing the second color-changing component.

[0078] (2) After the spinning dope of the first color-changing component and the spinning dope of the second color-changing component obtained in step (1) are aged, they are respectively subjected to dry spinning through a core-sheath type spinneret assembly, and fibers are obtained through the steps of spinneret stretching and high-temperature drying, and then colorful color-changing spandex fibers are obtained through oiling and winding forming, wherein the first color-changing component is the skin layer and the second color-changing component is the core layer.

[0079] The first color-changing component and the second color-changing component of the colorful color-changing spandex fiber are specifically shown in Table 1 below:

[0080] Table 1:

[0081]

[0082]

[0083] Comparative Example 1:

[0084] The difference from Example 1 is that no color-changing auxiliary is added to both the first color-changing component and the second color-changing component, and the others remain unchanged.

[0085] Comparative Example 2:

[0086] The difference from Example 3 is that the spinning dope containing the first color-changing component is directly subjected to dry spinning using a conventional single-component spinneret assembly, and fibers are obtained through the steps of spinneret stretching and high-temperature drying, and then color-changing spandex fibers are obtained through oiling and winding forming.

[0087] Comparative Example 3:

[0088] The difference from Example 5 is that 0.3% by mass of the second color-changing auxiliary is added to the first component, and the spinning dope of the component containing both the first color-changing auxiliary, the second color-changing auxiliary and the first polyurethane-urea is subjected to dry spinning using a conventional single-component spinneret assembly, and fibers are obtained through the steps of spinneret stretching and high-temperature drying, and then color-changing spandex fibers are obtained through oiling and winding forming.

[0089] Comparative Example 4:

[0090] The difference from Example 5 is that the spinning dope of the first color-changing component and the spinning dope of the second color-changing component are respectively subjected to dry spinning through a two-component type spinneret assembly, and fibers are obtained through the steps of spinneret stretching and high-temperature drying, and then colorful color-changing spandex fibers are obtained through oiling and winding forming.

[0091] The mechanical properties, fiber color, and cross-sectional boundary conditions of the spandex fibers prepared in the examples and comparative examples were tested respectively. The test methods are as follows:

[0092] (1) Mechanical properties:

[0093] Tensile strength: The tensile speed of the tensile testing machine was pulled up at 500 mm / min until the test fiber specimen broke, and the maximum load borne by the fiber at the time of fracture was recorded;

[0094] Elongation at break: The tensile speed of the tensile testing machine was pulled up at 500 mm / min until the test fiber specimen broke, and the elongation length at the time of fiber fracture was recorded. The ratio of it to the length before stretching was calculated, and the percentage of the elongation of the sample wire at the time of fracture to the starting length of the sample wire was the elongation at break;

[0095] Strength at 300% elongation: The tensile speed of the tensile testing machine was pulled up at 500 mm / min until the test fiber specimen wire elongated to 300% of the starting length, and the load borne by the fiber was recorded.

[0096] (2) Fiber color: The test fibers were placed under indoor light and sunlight / ultraviolet light respectively, and the color change of the fibers was observed.

[0097] (3) Fiber cross-sectional boundary conditions: The test fibers were placed under indoor light and sunlight / ultraviolet light respectively, and the cross-sectional boundary conditions of the fiber color were observed.

[0098] The test methods are shown in Table 2 below:

[0099] Table 2:

[0100]

[0101]

[0102]

Claims

1. A colorful color-changing spandex fiber, characterized in that: The spandex fiber contains at least a first color-changing component and a second color-changing component which are connected to each other but not fused, and a clear boundary exists between the first color-changing component and the second color-changing component on the cross section of the spandex fiber.

2. The multi-colored color-changing spandex fiber according to claim 1, characterized in that: The first color-changing component and the second color-changing component extend side by side along the axial direction of the spandex fiber, respectively. On the cross section of the spandex fiber, the first color-changing component occupies a part of the interior and outer periphery of the cross section, and the second color-changing component occupies the remaining part of the interior and outer periphery of the cross section. The mass ratio of the first color-changing component to the second color-changing component is 1:9 to 9:

1.

3. The multi-colored color-changing spandex fiber according to claim 2, characterized in that: The first color-changing component includes a first polyurethane-urea and a first color-changing auxiliary agent, and the mass content of the first color-changing auxiliary agent is 0.05% to 3%, calculated based on the total mass of the first color-changing component.

4. The multi-colored color-changing spandex fiber according to claim 2, characterized in that: The second color-changing component includes a second polyurethane-urea and a second color-changing auxiliary agent; the mass content of the second color-changing auxiliary agent is 0.05% to 3%, calculated based on the total mass of the second color-changing component.

5. The multi-color-changing spandex fiber according to claim 2, characterized in that: The first color-changing auxiliary agent and the second color-changing auxiliary agent independently include photochromic materials; the photochromic material includes at least one of azobenzene, spiropyran, and spirooxazine color-changing materials, preferably spirooxazine color-changing materials.

6. The multi-color-changing spandex fiber according to claim 5, characterized in that: The photochromic material does not change color under the condition of no sunlight or no ultraviolet light, but changes color under the condition of sunlight or ultraviolet light; the first color-changing agent and the second color-changing agent change color under the condition of sunlight or ultraviolet light, but the colors after color change are inconsistent.

7. The multi-color-changing spandex fiber according to claim 1, characterized in that: The first polyurethane-urea and the second polyurethane-urea independently include reaction products of polymer polyol, polyisocyanate, diamine chain extender and terminator. The polymer polyol includes polyester polyol and / or polyether polyol, and the polyether polyol includes one or more of polytetramethylene glycol, polyethylene glycol or polypropylene glycol; the number average molecular weight of the polymer polyol is 1000-5000 g / mol; The polyisocyanate includes toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dimethylbiphenyl diisocyanate, naphthalene diisocyanate, p-phenylene diisocyanate, dicyclohexylmethane diisocyanate and / or derivatives and / or modified polymers. The diamine chain extender includes one or more of ethylenediamine, propylenediamine, 2-methyl-1,5-pentanediamine, pentanediamine, and hexamethylenediamine; the terminator includes one or more of dimethylamine, diethylamine, dipropylamine, n-butanol, and ethanolamine.

8. A method for preparing the multi-color-changing spandex fiber according to any one of claims 1 to 7, characterized in that: The method for preparing colorful color-changing spandex fiber comprises at least taking the first color-changing component and the second color-changing component as spinning raw materials, and obtaining them by dry spinning through parallel spinneret assemblies in the presence of a solvent; the parallel spinneret assemblies contain a spinneret plate, and at least one spinneret hole is arranged on the spinneret plate, and each spinneret hole comprises at least two groups of independent first spinneret pipes and second spinneret pipes.

9. The method for preparing the multi-color-changing spandex fiber according to claim 8, characterized in that: The first spinning pipe (9) comprises a first feed port (3), a first conveying pipe (5) and a first discharge port (7) in sequence, and the second spinning pipe (10) comprises a second feed port (4), a second conveying pipe (6) and a second discharge port (8) in sequence; the first discharge port (7) and the second discharge port (8) are isolated from each other, and the closest distance between the outer periphery of the first discharge port (7) and the second discharge port (8) at the outlet is 2 to 5 mm.

10. The method for preparing the multi-color-changing spandex fiber according to claim 8, characterized in that: The included angle θ between the first spinning pipe (9) and the second spinning pipe (10) is 5 to 30°.

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