Special ink for acrylic fiber textile and preparation method of special ink

Abstract

The invention relates to the technical field of ink, in particular to special ink for acrylic textiles and a preparation method thereof. The invention relates to an anti-mildew cationic dye which is prepared from the following raw materials in percentage by weight: 8 to 12 percent of cationic dye, 10 to 15 percent of gel-state binder, 60 to 78 percent of deionized water, 5 to 10 percent of propylene glycol, 0.2 to 0.3 percent of mildew preventive, 0.1 to 0.2 percent of N-sodium oleoylmethyl taurate, 0.5 to 0.8 percent of trihydroxymethyl aminomethane and 0.1 to 0.3 percent of polyvinylpyrrolidone. The prepared ink can be firmly attached to acrylic fibers and resists stripping and swelling in the washing process. The components such as propylene glycol and polyvinylpyrrolidone in the ink formula are beneficial to adjusting the viscosity and fluidity of the ink, so that the ink is suitable for high-precision textile printing and dyeing processes such as ink jet printing.

Description

Technical Field

[0001] The present invention relates to the technical field of inks, and in particular to a special ink for acrylic textiles and a preparation method thereof. Background Art

[0002] Acrylic (polyacrylonitrile fiber) is an important synthetic material widely used in the textile industry. Due to its excellent light resistance, weather resistance, elasticity and wool-like texture, it is widely used in the production of outdoor clothing, home textiles, decorative fabrics and industrial cloth. However, acrylic fiber has a smooth surface and a dense chemical structure. Compared with traditional natural fibers, it has a lower affinity for dyes, which makes it difficult for conventional water-based or solvent-based inks to achieve high adhesion and high color fastness printing effects on acrylic textiles. In traditional processes, although disperse dyes can be used for coloring through high-temperature and high-pressure dyeing, the process is complex, energy consumption is high, and it is difficult to meet the market demand for small batches, multiple colors and fast responses in the digital printing era. In addition, some existing acrylic printing inks have problems such as insufficient color saturation, poor friction resistance, and substandard washability, and face challenges in terms of environmental protection.

[0003] Patent publication number CN101864206A discloses a digital textile ink composition comprising: at least one water-soluble anionic dye, present in an amount of 0.5-35 weight percent; a dispersant, present in an amount of 0.1-10 weight percent; an organic solvent, present in an amount of 5-35 weight percent; and water, present in an amount of 20-94.4 weight percent. This ink exhibits high pH stability, good storage stability, smooth printing, and reduced dye fade. However, because this ink relies on physically adsorbed anionic dyes and lacks a film-forming resin and crosslinking agent, it exhibits insufficient adhesion and struggles to adhere firmly to textile fibers. Furthermore, the ink exhibits poor stability and readily absorbs moisture, triggering hydrolysis and resulting in color fading. Furthermore, the ink layer itself is somewhat brittle and prone to cracking or even flaking when subjected to external forces or stress, compromising the performance and durability of the textile. Summary of the Invention

[0004] In order to solve the problems mentioned in the above background technology, the present invention provides a special ink for acrylic textiles and a preparation method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention discloses a special ink for acrylic textiles, which comprises the following raw materials by weight: 8-12% of cationic dye, 10-15% of gel binder, 60-78% of deionized water, 5-10% of propylene glycol, 0.2-0.3% of mildew preventer, 0.1-0.2% of sodium N-oleoylmethyl taurate, 0.5-0.8% of tris(hydroxymethyl)aminomethane and 0.1-0.3% of polyvinyl pyrrolidone.

[0007] Furthermore, the cationic dye includes one or more of cationic pink X-FG, cationic red FF, cationic red SD-GRL, cationic blue X-GRRL, cationic blue M-RL, cationic navy SD-BRL, cationic black X-2RL, cationic black FDL, cationic black EBB, cationic golden yellow X-GL, cationic fluorescent yellow X-10GFF and cationic yellow SD-5GL.

[0008] Furthermore, the mildew inhibitor includes one or more of methylisothiazolinone, chloroisothiazolinone and benzalkonium chloride.

[0009] Furthermore, the gel adhesive comprises the following steps to prepare:

[0010] Polyethyleneimine is added to anhydrous ethanol to prepare a polyethyleneimine ethanol solution, polythiocarbamate is added to N,N-dimethylacetamide, and the mixture is placed in an oil bath for ultrasonic degassing for 20-30 minutes. 3-mercaptopropyltriethoxysilane is added, and under nitrogen protection, the polyethyleneimine ethanol solution is added dropwise. Ultraviolet light irradiation is turned on, and the temperature is controlled and magnetic stirring is performed to react for 2-4 hours. 0.1wt% hydroquinone is added to terminate the reaction, and the mixture is poured into cold ether for precipitation. The solid is collected by centrifugation, washed three times with ethanol / water (7:3v / v), and vacuum dried at 40°C to constant weight to obtain a gel adhesive.

[0011] Furthermore, the mass ratio of polyethyleneimine, anhydrous ethanol, polythiocarbamate, N,N-dimethylacetamide and 3-mercaptopropyltriethoxysilane is (15-16.5): (40-42): (10-12): (188-192): (1-1.2).

[0012] Furthermore, the temperature of the oil bath is 60-65° C., the power of the ultrasonic treatment is 300-400 W, and the frequency is 40-50 kHz.

[0013] Furthermore, the UV irradiation conditions are: wavelength 365nm, light intensity 15-17mW / cm 2 , the optical path distance is 10-11cm, and the irradiation time is 2-4h.

[0014] Furthermore, the temperature is controlled at 64-66° C., and the speed of the magnetic stirring is controlled at 200-300 rpm.

[0015] According to another aspect of the present invention, there is provided a method for preparing the above-mentioned special ink for acrylic textiles, comprising the following steps:

[0016] S1. Add deionized water to propylene glycol by weight percentage and stir in a water bath until completely miscible. Add tris(hydroxymethyl)aminomethane and fine-adjust the pH to 7.5-8.0 with 1% dilute hydrochloric acid or NaOH. Add polyvinylpyrrolidone and heat. Continue stirring for 1-2 hours until a transparent colloid is formed. Add sodium N-oleoylmethyltaurate and a mildew inhibitor and stir for 30-40 minutes until uniform to obtain a base liquid.

[0017] S2. Add the cationic dye to the base liquid, shear and disperse until no particles are visible to the naked eye, add a gel binder, control the temperature, stir for 2-3 hours, filter with a 5μm nylon filter membrane, fill and seal to obtain a special ink for acrylic textiles.

[0018] Furthermore, the temperature of the water bath in step S1 is 40-45°C, which is raised to 50-55°C, and the temperature is controlled at 50-55°C in step S2.

[0019] Beneficial effects of the present invention:

[0020] 1. In the technical solution of this invention, 3-mercaptopropyltriethoxysilane in the gel-state binder undergoes a free radical-mediated addition reaction with polythiocarbamate under ultraviolet light irradiation, forming stable C-S covalent bonds. Simultaneously, the primary amine groups of polyethyleneimine undergo nucleophilic substitution with the thiocarbamate groups of the polythiocarbamate, achieving covalent crosslinking between molecular chains through dynamic covalent bond reconstruction, enabling strong adhesion to acrylic fibers.

[0021] 2. In the technical solution of the present invention, the hydrolysis and polycondensation reaction of 3-mercaptopropyltriethoxysilane forms a Si-O-Si three-dimensional network, which is cross-linked with the organic phase through hydrogen bonds and possible covalent bonds to form an organic-inorganic interpenetrating network structure, thereby enhancing its mechanical strength and durability, improving the penetration and anchoring ability of ink on the fiber surface, and enhancing the toughness and self-repairing ability of the network, so that the viscosity of the gel drops sharply under high shear rate of printing, and quickly returns to the gel state when the fiber surface is static, thereby avoiding ink diffusion.

[0022] 3. The ink produced by this invention adheres firmly to acrylic fibers and resists peeling and swelling during washing. Ingredients such as propylene glycol and polyvinyl pyrrolidone in the ink formula help adjust the ink's viscosity and fluidity, making it suitable for high-precision textile printing and dyeing processes such as inkjet printing.

[0023] 4. In the technical solution of the present invention, a variety of cationic dyes are selected in the ink formula, which have good affinity with acrylic fibers, can ensure uniform, bright and high color fastness of dyeing, can meet different color requirements, and maintain the stability and consistency of dyeing. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Unless otherwise specified, the raw materials used in the present invention are all conventional products purchased from the market, and the polythiocarbamate is prepared according to the method of publication number CN111763316A.

[0026] Preparation Example 1

[0027] The gel adhesive comprises the following steps to prepare:

[0028] 15 g of polyethyleneimine was added to 40 g of anhydrous ethanol to prepare a polyethyleneimine ethanol solution. 10 g of polythiocarbamate was added to 188 g of N, N-dimethylacetamide. The mixture was placed in a 60°C oil bath for ultrasonic degassing for 20 min at a power of 300 W and a frequency of 40 kHz. 1 g of 3-mercaptopropyltriethoxysilane was added. Under nitrogen protection, the polyethyleneimine ethanol solution was added dropwise. The UV irradiation was started. The UV irradiation conditions were: wavelength 365 nm, light intensity 15 mW / cm 2 , the optical path distance is 10 cm, the irradiation time is 2 h, the temperature is controlled at 64 ° C, the magnetic stirring speed is 200 rpm, and the reaction is carried out for 2 h. After the reaction is completed, 0.1 wt% hydroquinone is added to terminate the reaction, and the mixture is poured into cold ether for precipitation. The solid is collected by centrifugation, washed three times with ethanol / water (7:3 v / v), and vacuum dried at 40 ° C to constant weight to obtain a gel adhesive.

[0029] Preparation Example 2

[0030] The gel adhesive comprises the following steps to prepare:

[0031] 16 g of polyethyleneimine was added to 41 g of anhydrous ethanol to prepare a polyethyleneimine ethanol solution. 11 g of polythiocarbamate was added to 190 g of N,N-dimethylacetamide. The mixture was placed in an oil bath at 60-65°C and ultrasonically degassed for 25 min at a power of 350 W and a frequency of 45 kHz. 1.1 g of 3-mercaptopropyltriethoxysilane was added. Under nitrogen protection, the polyethyleneimine ethanol solution was added dropwise. The mixture was then irradiated with ultraviolet light. The conditions for ultraviolet light irradiation were: wavelength of 365 nm and light intensity of 16 mW / cm 2 , the optical path distance is 10 cm, the irradiation time is 3 h, the temperature is controlled at 65 ° C, the magnetic stirring speed is 250 rpm, and the reaction is carried out for 3 h. After the reaction is completed, 0.1 wt% hydroquinone is added to terminate the reaction, and the mixture is poured into cold ether for precipitation. The solid is collected by centrifugation, washed three times with ethanol / water (7:3 v / v), and vacuum dried at 40 ° C to constant weight to obtain a gel adhesive.

[0032] Preparation Example 3

[0033] The gel adhesive comprises the following steps to prepare:

[0034] 16.5 g of polyethyleneimine was added to 42 g of anhydrous ethanol to prepare a polyethyleneimine ethanol solution. 12 g of polythiocarbamate was added to 192 g of N,N-dimethylacetamide. The mixture was placed in a 65°C oil bath for ultrasonic degassing for 30 min at a power of 400 W and a frequency of 50 kHz. 1.2 g of 3-mercaptopropyltriethoxysilane was added. Under nitrogen protection, the polyethyleneimine ethanol solution was added dropwise. The mixture was then irradiated with ultraviolet light. The conditions for ultraviolet light irradiation were: wavelength of 365 nm and light intensity of 17 mW / cm 2 The optical path distance was 11 cm, the irradiation time was 4 h, the temperature was controlled at 66 ° C, the magnetic stirring speed was 300 rpm, and the reaction was carried out for 4 h. After the reaction was completed, 0.1 wt% hydroquinone was added to terminate the reaction, and the mixture was poured into cold ether for precipitation. The solid was collected by centrifugation, washed three times with ethanol / water (7:3 v / v), and vacuum dried at 40 ° C to constant weight to obtain a gel adhesive.

[0035] Example 1

[0036] A method for preparing the above-mentioned special ink for acrylic textiles comprises the following steps:

[0037] S1. Add 73.9 g of deionized water to 5 g of propylene glycol and stir in a water bath until completely miscible. Add 0.5 g of tris(hydroxymethyl)aminomethane and fine-adjust the pH to 7.5 with 1% dilute hydrochloric acid or NaOH. Add 0.3 g of polyvinylpyrrolidone and heat. Continue stirring for 1 h until a transparent colloid is formed. Add 0.1 g of sodium N-oleoylmethyl taurate and 0.2 g of a mildew inhibitor and stir for 30 min until uniform to obtain a base solution.

[0038] S2. Add 10 g of cationic dye to the base liquid, shear and disperse until no particles are visible to the naked eye, add 10 g of the gel binder prepared in Preparation Example 1, control the temperature, stir for 2 h, filter with a 5 μm nylon filter membrane, fill and seal to obtain a special ink for acrylic textiles.

[0039] Example 2

[0040] A method for preparing the above-mentioned special ink for acrylic textiles comprises the following steps:

[0041] S1. Add 65.75 g of deionized water to 7.5 g of propylene glycol and stir in a water bath until completely miscible. Add 0.65 g of tris(hydroxymethyl)aminomethane and fine-adjust the pH to 7.8 with 1% dilute hydrochloric acid or NaOH. Add 0.2 g of polyvinylpyrrolidone and heat. Continue stirring for 1.5 h until a transparent colloid is formed. Add 0.15 g of sodium N-oleoylmethyl taurate and 0.25 g of a mildew inhibitor and stir for 35 min until homogeneous to obtain a base solution.

[0042] S2. Add 10 g of cationic dye to the base liquid, shear and disperse until no particles are visible to the naked eye, add 12.5 g of the gel binder prepared in Preparation Example 2, control the temperature, stir for 2.5 h, filter with a 5 μm nylon filter membrane, fill and seal to obtain a special ink for acrylic textiles.

[0043] Example 3

[0044] A method for preparing the above-mentioned special ink for acrylic textiles comprises the following steps:

[0045] S1. Add 66.9 g of deionized water to 5 g of propylene glycol and stir in a water bath until completely miscible. Add 0.8 g of tris(hydroxymethyl)aminomethane and fine-adjust the pH to 8.0 with 1% dilute hydrochloric acid or NaOH. Add 0.3 g of polyvinylpyrrolidone and heat. Continue stirring for 2 h until a transparent colloid is formed. Add 0.2 g of sodium N-oleoylmethyl taurate and 0.3 g of a mildew inhibitor and stir for 40 min until uniform to obtain a base solution.

[0046] S2. Add 12 g of cationic dye to the base liquid, shear and disperse until no particles are visible to the naked eye, add 14.5 g of the gel binder prepared in Preparation Example 3, control the temperature, stir for 3 h, filter with a 5 μm nylon filter membrane, fill and seal to obtain a special ink for acrylic textiles.

[0047] Comparative Example 1

[0048] The difference between this comparative example and Example 1 is that polyethyleneimine is used instead of the gel binder, and the remaining steps are the same as those in Example 1.

[0049] Comparative Example 2

[0050] The difference between this comparative example and Example 2 is that polythiocarbamate is used instead of the gel binder, and the remaining steps are the same as those in Example 2.

[0051] Comparative Example 3

[0052] The difference between this comparative example and Example 3 is that 3-mercaptopropyltriethoxysilane is used instead of the gel binder, and the remaining steps are the same as those in Example 3.

[0053] (I) Color fastness test: the weight is 150g / m 2 100% acrylic plain fabric was cut into 20×20 cm samples, washed with deionized water at 50°C for 30 min, dried, and printed with the inks prepared in Examples 1-3 and Comparative Examples 1-3 into 5×5 cm square color blocks using an inkjet printer (nozzle diameter of 35 μm), and dried with hot air at 130°C for 3 min.

[0054] The color fastness to rubbing was tested using a Crockmeter SDL Atlas with a rubbing head pressure of 9 kPa and a rubbing stroke of 10 reciprocating strokes (10 cm in one direction). The rubbing cloth was a standard cotton cloth with a moisture content of 0% for dry rubbing and 100% for wet rubbing. The cotton cloth was graded for staining using a gray scale (1 = severe staining, 5 = no staining), and this was repeated three times.

[0055] Washing color fastness was tested using a Launder-Ometer according to AATCC 61-2016. The washing liquid was 5 g / L AATCC standard detergent, the temperature was 40°C, and the washing time was 45 min (equivalent to 5 home washes). Ten stainless steel beads with a diameter of 6 mm were used. The beads were laid flat to dry at room temperature. The color difference ΔE before and after washing was measured using a spectrophotometer (X-Rite Ci64, D65 light source). This was repeated three times. Where L is lightness (0 = black, 100 = white); a is the red-green axis (+a = red, -a = green); b is the yellow-blue axis (+b = yellow, -b = blue); L1, a1, and b1 are the original color blocks; L2, a2, and b2 are the washed color blocks. The evaluation criteria are: ΔE ≤ 2.0: The human eye can hardly detect the difference (pass); 2.0 < ΔE ≤ 4.0: Noticeable but acceptable; ΔE > 4.0: Significant fading or discoloration (failure). The results are shown in Table 1:

[0056] Table 1. Color fastness test of Examples 1-3 and Comparative Examples 1-3

[0057]

[0058]

[0059] (II) Adhesion test: the weight is 150g / m2 100% acrylic plain weave fabric was cut into 100 x 25 mm specimens, rinsed with deionized water at 50°C for 30 minutes, and then dried. The inks from Examples 1-3 and Comparative Examples 1-3 were evenly applied to the fabric surface using a wire rod applicator (wet film thickness 50 μm), covering an area of 80 x 25 mm. The fabric was then hot-air dried at 80°C for 30 minutes. Peel strength was tested using a universal testing machine (Instron 5967 with a 180° peel fixture) at a tensile rate of 100 mm / min, a peel angle of 180°, and a data acquisition frequency of 10 Hz. The coated and uncoated areas were bonded together with double-sided tape. The specimens were clamped at both ends, and the average force during the stable peel force period (25-75 mm travel) was recorded. The peel strength (N / cm) was calculated as: average force / specimen width. In the above color fastness test, after the cotton cloth was graded for staining using a grayscale card, the samples of Examples 1-3 and Comparative Examples 1-3 were placed in a universal material testing machine and tested for post-wash peel strength using the same method as above. The retention rate was calculated as: retention rate (%) = (post-wash peel strength / peel strength) × 100. The results are shown in Table 2:

[0060] Table 2. Adhesion test of Examples 1-3 and Comparative Examples 1-3

[0061]

[0062]

[0063] As shown in Table 1, Examples 1-3 exhibit excellent color fastness performance, with dry rubbing color fastness ranging from 4.5 to 5.0, wet rubbing color fastness ranging from 3.8 to 4.5, and ΔE values ranging from 0.7 to 1.2. This indicates that the ink has good fixation and wash resistance on acrylic fabric. Comparative Examples 1-3 exhibit significantly lower dry and wet rubbing color fastness than the Examples, with higher ΔE values, indicating poor color fastness. Comparative Example 1 uses polyethyleneimine instead of the gel binder, Comparative Example 2 uses polythiocarbamate, and Comparative Example 3 uses 3-mercaptopropyltriethoxysilane, all of which are inferior to the gel binder.

[0064] As shown in Table 2, the peel strengths of Examples 1-3 ranged from 5.2 to 8.1 N / cm, and the peel strength retention after washing ranged from 90.4% to 93.8%, indicating strong adhesion between the ink and the acrylic fabric, and that the adhesion remained well after washing. The peel strengths and peel strength retention after washing of Comparative Examples 1-3 were significantly lower than those of the Examples, indicating poor adhesion.

[0065] In Examples 1-3, the gel-state binder may form a gel system with a three-dimensional network structure, which can effectively fix the cationic dye on the acrylic fabric, improve the color fastness and adhesion of the ink, form a stable chemical bond, and enhance the interaction between the ink and the fabric.

[0066] While polyethyleneimine in Comparative Example 1 exhibits some adhesive properties, it fails to form a stable gel structure when used alone, resulting in decreased color fastness and adhesion. While polythiocarbamate in Comparative Example 2 provides some adhesive properties, it lacks synergy with other ingredients and fails to form an effective gel network, resulting in poor color fastness and adhesion. 3-Mercaptopropyltriethoxysilane in Comparative Example 3 fails to form a gel structure when used alone, and likely exhibits weak interaction with the fabric, leading to significantly decreased color fastness and adhesion.

[0067] In summary, the synergistic effect of the various components in the examples forms a stable gel network structure, effectively improving the color fastness and adhesion of the ink. The cross-linking reaction and chemical bonding in the gel binder enhance the interaction between the ink and the fabric, making the ink less likely to fall off or discolor during washing.

[0068] Throughout the specification, reference to terms such as "Preparation," "Example," or "Examples" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or preparation are included in at least one embodiment or preparation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or preparation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or preparations.

[0069] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A special ink for acrylic textiles, characterized in that: The invention comprises the following raw materials by weight percentage: 8-12% of cationic dye, 10-15% of gel binder, 60-78% of deionized water, 5-10% of propylene glycol, 0.2-0.3% of mildew preventer, 0.1-0.2% of sodium N-oleoylmethyl taurate, 0.5-0.8% of tris(hydroxymethyl)aminomethane and 0.1-0.3% of polyvinyl pyrrolidone.

2. The special ink for acrylic textiles according to claim 1, wherein: Cationic dyes include one or more of cationic pink X-FG, cationic red FF, cationic red SD-GRL, cationic blue X-GRRL, cationic blue M-RL, cationic navy SD-BRL, cationic black X-2RL, cationic black FDL, cationic black EBB, cationic golden yellow X-GL, cationic fluorescent yellow X-10GFF and cationic yellow SD-5GL.

3. The special ink for acrylic textiles according to claim 1, characterized in that: The mildew preventer includes one or more of methylisothiazolinone, chloroisothiazolinone and benzalkonium chloride.

4. The special ink for acrylic textiles according to claim 1, characterized in that: The gel adhesive is prepared by the following steps: Polyethyleneimine is added to anhydrous ethanol to prepare a polyethyleneimine ethanol solution, polythiocarbamate is added to N,N-dimethylacetamide, and the mixture is placed in an oil bath for ultrasonic degassing for 20-30 minutes. 3-mercaptopropyltriethoxysilane is added, and the polyethyleneimine ethanol solution is added dropwise under nitrogen protection. Ultraviolet light irradiation is turned on, and the temperature is controlled and magnetic stirring is performed to react for 2-4 hours. After the reaction is completed, the mixture is precipitated, washed, and dried to obtain a gel adhesive.

5. The special ink for acrylic textiles according to claim 4, characterized in that: The mass ratio of polyethyleneimine, anhydrous ethanol, polythiocarbamate, N,N-dimethylacetamide and 3-mercaptopropyltriethoxysilane is (15-16.5): (40-42): (10-12): (188-192): (1-1.2).

6. The special ink for acrylic textiles according to claim 4, characterized in that: The temperature of the oil bath was 60-65°C, the power of the ultrasonic treatment was 300-400 W, and the frequency was 40-50 kHz.

7. The special ink for acrylic textiles according to claim 4, characterized in that: UV irradiation conditions: wavelength 365nm, light intensity 15-17mW / cm 2 , the optical path distance is 10-11cm, and the irradiation time is 2-4h.

8. The special ink for acrylic textiles according to claim 4, characterized in that: The temperature was controlled at 64-66°C and the speed of magnetic stirring was 200-300 rpm.

9. A method for preparing a special ink for acrylic textiles according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Add deionized water to propylene glycol by weight percentage, stir in a water bath until completely miscible, add tris(hydroxymethyl)aminomethane, adjust the pH to 7.5-8.0, add polyvinylpyrrolidone, increase the temperature, and continue stirring for 1-2 hours until a transparent colloid is formed, add sodium N-oleoylmethyltaurate and a mildew inhibitor, and stir for 30-40 minutes until uniform, to obtain a base liquid; S2. Add the cationic dye to the base liquid, shear and disperse it, add a gel binder, control the temperature, stir for 2-3 hours, filter, fill and seal to obtain a special ink for acrylic textiles.

10. The method for preparing a special ink for acrylic textiles according to claim 1, wherein: The temperature of the water bath in step S1 is 40-45°C, which is raised to 50-55°C, and the temperature is controlled at 50-55°C in step S2.

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