A black color paste for acrylic fiber and preparation method thereof

Abstract

The invention discloses a black color paste for acrylic fiber and a preparation method thereof, wherein the black color paste for acrylic fiber stock solution coloring includes a solvent, a dispersant and carbon black, wherein the mass of the solvent in the black color paste accounts for 75-88%, the mass of the dispersant is 14%-40% of the mass of the carbon black, and the dispersant includes diethylene glycol dimethyl ether and a polymer. The preparation method includes: adding a dispersant to a solvent, then adding carbon black, stirring evenly, grinding and dispersing, precipitating and filtering, and obtaining a black color paste for acrylic fiber stock solution coloring. The solvent-based black color paste prepared by the present invention has good dispersibility, good compatibility with acrylic spinning stock solution, and good spinnability after being mixed into the acrylic spinning stock solution.

Description

Technical Field

[0001] The invention belongs to the field of acrylic fibers, and in particular relates to a black color paste for acrylic fibers and a preparation method thereof. Background Art

[0002] Acrylic fiber, also known as polyacrylonitrile fiber, is known as "artificial wool". It has the advantages of being soft, bulky, easy to dye, brightly colored, light-resistant, antibacterial, and not afraid of insects.

[0003] The production method of acrylic fiber can adopt the sodium thiocyanate method, that is, polyacrylonitrile is dissolved with sodium thiocyanate solution, and then acrylic fiber is prepared by wet spinning. To produce black acrylic fiber, it is necessary to mix water-based black color paste into acrylic stock solution before spinning to prepare black acrylic fiber. Another acrylic fiber production method uses a strong polar solvent dimethylacetamide to dissolve polyacrylonitrile and prepare acrylic fiber by wet spinning. The fiber produced by this method is of excellent quality, with little loss of dimethylacetamide, and has greater cost and quality advantages over other acrylic fiber production methods. However, when using this method to produce black acrylic fiber, it is necessary to use a solvent-based black color paste mixed with acrylic stock solution for spinning in order to achieve smooth spinning.

[0004] Solvent-based black color paste is essentially different from water-based black color paste used in other methods of acrylic fiber. There are many kinds of additives for water-based color paste, and conventional surfactants or polymer dispersants are applicable. They can be produced by homogenizers and sand mills. They are relatively mature in dispersion technology and have a wide range of applications. The solvent-based color paste on the market is mainly used in coatings and is mainly produced using some low-polarity solvents. There are fewer types of additives that can be used for strong polar solvents, and the production of solvent-based color paste produced with strong polar solvents and with good compatibility with acrylic fiber stock solution has not been reported.

[0005] A Chinese patent with publication number CN103710772A discloses an ultrafine carbon black aqueous color paste for fiber stock solution coloring, the color paste is composed of modified carbon black, a dispersant, an organic solvent and deionized water, wherein the modified carbon black accounts for 15.0-40.0% of the total mass of the color paste, the mass ratio of the dispersant to the modified carbon black is 0.15:1-0.3:1, the organic solvent accounts for 5.0-15.0% of the total mass of the color paste, and the balance is deionized water, wherein the modified carbon black is obtained by surface-modifying carbon black with at least one surface modifier selected from 4-anilinesulfonic acid, stearamide and diethylmalonyl urea, and the amount of the surface modifier is 2.0-5.0% of the mass of the carbon black; the dispersant is a mixture of disodium N-dodecyl iminodipropionate and fatty amine polyoxyethylene ether in a mass ratio of 1:2-1:5. On the one hand, this technology prepares water-based color paste instead of solvent-based color paste; on the other hand, this solution improves the compatibility with the spinning solution by modifying the carbon black.

[0006] The Chinese patent with publication number CN108299951A discloses a nano-scale black color paste and its preparation method and application. The disclosed black color paste includes, by weight percentage: 15-25% carbon black, 5-30% dispersant and 50-75% solvent, wherein the solvent is dimethylacetamide and the dispersant includes acrylic copolymer polymer. The black color paste prepared by this technology is used for dyeing polyimide fiber. However, the raw materials, preparation methods and characteristics of acrylic fiber and polyimide fiber are different, and the black color paste used cannot be directly applied.

[0007] Therefore, how to provide a solvent-based black color paste that has good dispersibility and compatibility in acrylic fiber stock solution and good spinnability after being mixed into the acrylic fiber stock solution is a problem that needs to be solved.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a black color paste for acrylic fiber and a preparation method thereof. The present invention adopts a solvent, a dispersant and carbon black to prepare a solvent-based black color paste, which has excellent dispersibility, good compatibility with acrylic spinning solution, good spinnability after being mixed with acrylic spinning solution, less spinneret hole clogging, and less coagulation bath discoloration.

[0010] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0011] The invention provides a black color paste for coloring acrylic fiber stock solution. The black color paste for coloring acrylic fiber stock solution comprises a solvent, a dispersant and carbon black. The mass proportion of the solvent in the black color paste is 75-88%, the mass of the dispersant is 14%-40% of the mass of the carbon black, and the dispersant comprises diethylene glycol dimethyl ether and a polymer.

[0012] In the dispersant of the present invention, diethylene glycol dimethyl ether is a non-protonic polar substance with stable chemical properties and is not easy to react. Its liquid has strong dissolving ability and can show adaptability in many aspects. It is close to the properties of dimethylacetamide with strong polarity and has good compatibility. Polymers, especially polymethyl methacrylate and polymethyl acrylate can be evenly dispersed under the action of diethylene glycol dimethyl ether, so that carbon black can be quickly and evenly dispersed in solvents and dispersants. The dispersant is a very good dispersant for carbon black. The solvent-based black color paste prepared by the present invention using solvents, dispersants and carbon black has excellent dispersibility, good compatibility with acrylic spinning stock solution, and good spinnability after being mixed into acrylic spinning stock solution.

[0013] In a further embodiment, the dispersant is a mixture of diethylene glycol dimethyl ether and a polymer, wherein the mass ratio of diethylene glycol dimethyl ether to the polymer is 21-23:79-77.

[0014] The results of the experiment show that when the mass ratio of diethylene glycol dimethyl ether to polymer is in the range of 21-23:79-77, diethylene glycol dimethyl ether and polymer can be dispersed synergistically to improve the dispersibility of carbon black and its compatibility with acrylic spinning solution.

[0015] In a further embodiment, the polymer is selected from at least one of polymethyl methacrylate and polymethyl acrylate.

[0016] In a further embodiment, the solvent is selected from dimethylacetamide and dimethylformamide.

[0017] In a further embodiment, the carbon black has a DBP value of 0.8-1.0 ml / g, a moisture content of <1.5%, a volatile matter of 0.5-1.0%, an ash content of <0.5%, and a pH value of 7.0-8.0;

[0018] Preferably, the carbon black is selected from pigment carbon black and rubber carbon black.

[0019] In the black color paste of the present invention, carbon black commonly used in the prior art such as rubber carbon black and pigment carbon black can be used. As the DBP value of carbon black increases or decreases, the amount of dispersant used increases or decreases accordingly.

[0020] In a further embodiment, the viscosity of the black color paste is less than 50 mpa.s, the D100 particle size is ≤1.5 μm, and the D50 particle size is ≤0.20 μm.

[0021] In the black color paste prepared by the invention, the particles have small particle size, large surface area, high stability, high solid content, low viscosity and good compatibility with acrylic fiber spinning solution.

[0022] The present invention also provides a method for preparing the black color paste as described above, comprising:

[0023] A dispersant is added to the solvent, and then carbon black is added, and after being stirred evenly, the mixture is ground and dispersed, and the precipitation is filtered to obtain a black color paste for coloring the acrylic fiber stock solution.

[0024] In a further embodiment, the stirring and emulsifying time is 1-3 hours; the grinding temperature is 15-40° C., and the number of grinding passes is 3-8 times;

[0025] In a further embodiment, the grinding equipment includes a high shear disperser, an emulsifying pump, a colloid mill, a homogenizer, a ball mill, a sand mill, etc., as well as a grinding and dispersing equipment formed by using one or more of the above combinations.

[0026] In a further embodiment, the precipitation time is 1-48 hours, preferably 1-24 hours, and the filtration is performed twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa.

[0027] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0028] 1. In the dispersant of the present invention, diethylene glycol dimethyl ether is a non-protonic polar substance with stable chemical properties and is not easy to react. Its liquid has strong dissolving ability and can show many aspects of adaptability. It is close to the properties of highly polar dimethylacetamide and has good compatibility. Polymers, especially polymethyl methacrylate and polymethyl acrylate, can be evenly dispersed under the action of diethylene glycol dimethyl ether, so that carbon black can be quickly and evenly dispersed in the solvent and dispersant. This dispersant is a very good dispersant for carbon black.

[0029] 2. The solvent-based black color paste prepared by the present invention using solvent, dispersant and carbon black has excellent dispersibility and good compatibility with acrylic spinning solution. After being mixed into the acrylic spinning solution, it has good spinnability.

[0030] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the finished black color paste prepared in Example 1 of the present invention under a microscope (magnified 500 times);

[0033] Figure 2 It is a particle size distribution diagram of the finished black color paste prepared in Example 1 of the present invention. It should be noted that these drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] Detection method:

[0036] Solid content: Solid content is the mass percentage of the remaining part after the color paste is dried at 120℃ for two hours.

[0037] Suction filtration value: Pour 500ml of color paste into the funnel above the suction filter bottle (filter material 80 poplin), turn on the vacuum pump, and start timing. The time ends when the color paste is filtered. The unit of suction filtration value is: second / 500ml.

[0038] Viscosity: "GBT7193-2008 Test method for unsaturated polyester resin".

[0039] D100 particle size: the equivalent diameter of the largest particle in the particle size distribution curve.

[0040] D50 particle size: It is the particle size corresponding to when the cumulative particle size distribution percentage of a sample reaches 50%.

[0041] Breaking strength: GB T 16602-2008 Acrylic staple fibers and tows.

[0042] Elongation at break: GB T 16602-2008 Acrylic staple fibers and tows.

[0043] Color fastness to soap washing: GB / T 3921-2008

[0044] Embodiment 1

[0045] Carbon black: 6040 pigment carbon black;

[0046] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polydimethacrylate is 21:79

[0047] Add 7 g of dispersant to 80 g of dimethylacetamide (the amount of dispersant added is 35% of the mass of carbon black), then add 20 g of carbon black, stir evenly at 800 rpm, emulsify for 3 hours, grind and disperse using a high shear disperser, the grinding temperature is 18°C, the number of grinding passes is 5, and then precipitate and filter for 24 hours, filter twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 18.4% to obtain a black color paste.

[0048] Black pulp finished product quality:

[0049] Solid content: 18.4%; Suction filter value: 5.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 1.152μm; D50 particle size: 0.163μm; pH value: 7.5.

[0050] Embodiment 2

[0051] Carbon black: P325 pigment carbon black;

[0052] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polydimethacrylate is 22:78

[0053] Add 5 g of dispersant (the amount of dispersant added is 25% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 800 rpm, emulsify for 1 hour, grind and disperse using a high shear disperser, the grinding temperature is 19°C, the number of grinding passes is 3, and then precipitate and filter for 48 hours, filter twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 20% to obtain a black color paste.

[0054] Black pulp finished product quality:

[0055] Solid content: 20.3%; Suction filter value: 6.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 0.835μm; D50 particle size: 0.103μm; pH value: 7.4.

[0056] Embodiment 3

[0057] Carbon black: N219 rubber carbon black.

[0058] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polyacrylic acid is 22:78

[0059] Add 2.6 g of dispersant (the amount of dispersant added is 13% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 1000 rpm, emulsify for 3 hours, grind and disperse using a high shear disperser, the grinding temperature is 36°C, the number of grinding passes is 8, and then precipitate and filter for 24 hours, filter twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 17.5% to obtain a black color paste.

[0060] Black pulp finished product quality:

[0061] Solid content: 17.5%; Suction filter value: 5.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 1.983μm; D50 particle size: 0.224μm; pH value: 7.8.

[0062] Embodiment 4

[0063] Carbon black: S430 pigment carbon black.

[0064] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polydimethacrylate is 22:78

[0065] Add 6 g of dispersant (the amount of dispersant added is 30% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 800 rpm, emulsify for 3 hours, grind and disperse using a high shear disperser, the grinding temperature is 20°C, the number of grinding passes is 5, and then precipitate and filter for 24 hours, filter twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 20% to obtain a black color paste.

[0066] Black pulp finished product quality:

[0067] Solid content: 19.9%; Suction filter value: 5.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 0.987μm; D50 particle size: 0.097μm; pH value: 7.2.

[0068] Embodiment 5

[0069] Carbon black: C311 pigment carbon black.

[0070] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polyacrylic acid is 23:77

[0071] Add 8 g of dispersant to 80 g of dimethylacetamide (the amount of dispersant added is 40% of the mass of carbon black), then add 20 g of carbon black, stir evenly at 800 rpm, emulsify for 3 hours, grind and disperse using a high shear disperser, the grinding temperature is 19°C, the number of grinding passes is 4, and then precipitate and filter for 48 hours, filter twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 18% to obtain a black color paste.

[0072] Black pulp finished product quality:

[0073] Solid content: 17.9%; Suction filter value: 15s / 500ml; Viscosity: 13mpa.s; D100 particle size: 1.153μm; D50 particle size: 0.142μm; pH value: 8.0.

[0074] Embodiment 6

[0075] Carbon black: N115 rubber carbon black.

[0076] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polydimethacrylate is 22:78

[0077] Add 6.4 g of dispersant (the amount of dispersant added is 32% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 800 rpm, emulsify for 3 hours, grind and disperse using a high shear disperser, the grinding temperature is 31°C, the number of grinding passes is 10, and then precipitate and filter for 48 hours, filter twice using a 1-micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 16.5% to obtain a black color paste.

[0078] Black pulp finished product quality:

[0079] Solid content: 16.4%; Suction filter value: 12.0s / 500ml; Viscosity: 15mpa.s; D100 particle size: 1.497μm; D50 particle size: 0.175μm; pH value: 7.7.

[0080] Embodiment 7

[0081] Carbon black: LS5260 pigment carbon black.

[0082] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polyacrylic acid is 21:79

[0083] Add 3.6 g of dispersant (the amount of dispersant added is 18% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 800 rotation speed, emulsify for 3 hours, grind and disperse with a high shear disperser, the grinding temperature is 18°C, the number of grinding passes is 3, and then precipitate and filter, the precipitation time is 40 hours, filter twice with a 0.1 micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 18.5% to obtain a black color paste.

[0084] Black pulp finished product quality:

[0085] Solid content: 18.6%; Suction filter value: 8.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 1.035μm; D50 particle size: 0.192μm; pH value: 7.6.

[0086] Embodiment 8

[0087] Carbon black: SJR-30 pigment carbon black.

[0088] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polydimethacrylate is 21:79

[0089] Add 6.6 g of dispersant (the amount of dispersant added is 33% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 800 rpm, emulsify for 3 hours, grind and disperse using a high shear disperser, the grinding temperature is 20°C, the number of grinding passes is 4, and then precipitate and filter, the precipitation time is 16 hours, and filter twice using a 0.1 micron polypropylene filter bag, the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 20% to obtain a black color paste.

[0090] Black pulp finished product quality:

[0091] Solid content: 20.1%; Suction filter value: 5.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 0.987μm; D50 particle size: 0.163μm; pH value: 7.0.

[0092] Embodiment 9

[0093] Carbon black: N220 rubber carbon black.

[0094] Dispersant: The mass ratio of diethylene glycol dimethyl ether to polyacrylic acid is 22:78

[0095] Add 6 g of dispersant (the amount of dispersant added is 30% of the mass of carbon black) to 80 g of dimethylacetamide, then add 20 g of carbon black, stir evenly at 800 rotation speed, emulsify for 3 hours, grind and disperse with a high shear disperser, the grinding temperature is 33°C, the number of grinding passes is 8, and then precipitate and filter, the precipitation time is 50 hours, filter twice with a 0.1 micron polypropylene filter bag, and the filtration pressure is ≤0.30 MPa; mix so that the solid content of the color paste is 22% to obtain a black color paste.

[0096] Black pulp finished product quality:

[0097] Solid content: 22.2%; Suction filter value: 7.0s / 500ml; Viscosity: 7.5mpa.s; D100 particle size: 1.423μm; D50 particle size: 0.175μm; pH value: 7.3.

[0098] Comparative Example 1

[0099] This comparative example adopts the preparation method of Example 1, except that no dispersant is added.

[0100] Comparative Example 2

[0101] This comparative example adopts the preparation method of Example 1, with the only difference being that the existing high molecular weight amide superdispersant 7796 is used as the dispersant.

[0102] Comparative Example 3

[0103] This comparative example adopts the preparation method of Example 1, the only difference being that the dispersant contains only diethylene glycol dimethyl ether.

[0104] Comparative Example 4

[0105] This comparative example adopts the preparation method of Example 1, the only difference being that the dispersant contains only polymethyl methacrylate.

[0106] Comparative Example 5

[0107] This comparative example adopts the preparation method of Example 1, except that the mass ratio of diethylene glycol dimethyl ether to polymethyl methacrylate contained in the dispersant is 15:85.

[0108] Comparative Example 6

[0109] This comparative example adopts the preparation method of Example 1, except that the mass ratio of diethylene glycol dimethyl ether to polymethyl methacrylate contained in the dispersant is 30:70.

[0110] The finished quality of the black color paste prepared in Examples 1-9 and Comparative Examples 1-6 is shown in the following table:

[0111] Table 1

[0112]

[0113]

[0114] Result analysis:

[0115] Compared with Examples 1-9, in Comparative Examples 1-6, except for Comparative Example 2, no formula dispersant was added, the suction and filtration values ​​were not too high or the values ​​were high, the color paste viscosity was high, and the particle size was large, indicating that the color paste had poor dispersibility and was not suitable for acrylic color paste spinning. However, in Comparative Example 2, which added the existing high molecular amide superdispersant 7796, its suction and filtration value, maximum particle size and average particle size were much higher than those of Example 1. This shows that the black color paste prepared by the dispersant in the present invention has better dispersibility and is suitable for acrylic color paste spinning.

[0116] In Examples 1-9, the amount of dispersant added in Example 3 is less than 13% of the mass of carbon black, and the dispersion effect is poorer than that of other examples. The combination scheme of Example 2 has the best effect.

[0117] Test Example 1

[0118] 0.5 kg of the black color paste prepared in Example 1-9 was added to the polyacrylonitrile spinning stock solution, the carbon black content in the color paste was 2%, and the polyacrylonitrile content in the polyacrylonitrile solution was 25%. The mixture was evenly mixed using an emulsifying pump, and then spun through a spinneret with an aperture of 45 μm using the existing method at a spinning speed of 80 meters to obtain acrylic fiber, and the product was subjected to performance testing.

[0119] Table 2

[0120]

[0121] Result analysis:

[0122] Through the color paste spinning test, the color paste prepared in the comparative example has poor spinnability, which is mainly manifested in the blockage of the spinneret hole and the inability to spin normally. Although the color paste prepared in comparative example 2 has good quality, the fiber breakage is obvious during the spinning process, indicating that the color paste system is not compatible with the polyacrylonitrile system.

[0123] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A black color paste for coloring acrylic fiber stock solution, It is characterized in that The black color paste used for coloring the acrylic fiber stock solution includes a solvent, a dispersant and carbon black, wherein the mass proportion of the solvent in the black color paste is 75%-88%, the mass of the dispersant is 14%-40% of the mass of the carbon black, and the dispersant is a mixture of diethylene glycol dimethyl ether and a polymer; The mass ratio of diethylene glycol dimethyl ether to the polymer is 21-23:79-77; the polymer is selected from at least one of polymethyl methacrylate and polymethyl acrylate.

2. The black color paste for coloring acrylic fiber stock solution according to claim 1, It is characterized in that The solvent is selected from dimethylacetamide and dimethylformamide.

3. The black color paste for acrylic fiber stock solution coloring according to claim 1, It is characterized in that The carbon black has a DBP value of 0.8-1.0 ml / g, a moisture content of <1.5%, a volatile matter of 0.5-1.0%, an ash content of <0.5%, and a pH value of 7.0-8.

0.

4. The black color paste for acrylic fiber stock solution coloring according to claim 3, It is characterized in that The carbon black is selected from pigment carbon black and rubber carbon black.

5. The black color paste for coloring acrylic fiber stock solution according to any one of claims 1 to 4, It is characterized in that The viscosity of the black color paste is less than 50 mpa.s, the D100 particle size is less than 1.5 μm, and the D50 particle size is less than 0.20 μm.

6. A method for preparing the black color paste according to any one of claims 1 to 5, It is characterized in that include: A dispersant is added to the solvent, and then carbon black is added, and after being stirred evenly, the mixture is ground and dispersed, and the precipitation is filtered to obtain a black color paste for coloring the acrylic fiber stock solution.

7. The preparation method according to claim 6, It is characterized in that The stirring and emulsifying time is 1-3 hours; the grinding temperature is 15-40° C., and the number of grinding passes is 3-8 times.

8. The preparation method according to claim 6, It is characterized in that The grinding and dispersing equipment includes a high shear disperser, an emulsifying pump, a colloid mill, a homogenizer, a ball mill, a sand mill or a combination of these.

9. The preparation method according to claim 6, It is characterized in that The precipitation time is 1-48 hours, and the filtration is performed twice using a 1-micron polypropylene filter bag, with a filtration pressure of ≤0.30 MPa.

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