A high-foaming water-fast disperse black dye composition and use thereof

Abstract

The application discloses a high-bubble water-fastness disperse black dye composition and application thereof, and belongs to the technical field of dyes. The disperse dye monomers, component A, component C and component D used in the application introduce a benzyl substituent on the coupling component amino nitrogen atom, instead of traditional alkyl, hydroxyalkyl, alkoxy, carboxyl and the like. The benzyl can form strong pi-pi interaction with polyester fibers, significantly improving the dyeing rate and sublimation fastness of the dye; meanwhile, the steric hindrance effect of the benzyl can effectively inhibit the thermal migration behavior of the dye, solving the industry pain point that the traditional alkyl-substituted dye has serious thermal migration and insufficient color fastness in deep color dyeing. Component B adopts a benzisothiazole azo dye, and an ester group or ether long chain is introduced on the azo component amino nitrogen atom, which is compatible with the benzyl structure dye, and improves the stability of the dye compounding system.

Description

Technical Field

[0001] This invention relates to the field of dye technology, and more specifically to a high water fastness disperse black dye composition and its application. Background Technology

[0002] With the continuous advancement of green, low-carbon, energy-saving, and emission-reduction policies in the textile printing and dyeing industry, short-process, low-energy-consumption dyeing and finishing technologies have become the mainstream development direction of the industry. Polyester and its blended fabrics, as core fabrics in the textile industry, are undergoing rapid upgrades in their dyeing and finishing processes towards simplified processes, reduced energy consumption, and environmental friendliness and efficiency. Among these, the "one wash, one treatment" process, with its advantages of simplified processing, reduced washing times, lower water and electricity consumption, and shorter production cycles, has become the mainstream trend in the dyeing and finishing of polyester and blended fabrics, placing higher performance requirements on specialized disperse dyes.

[0003] However, conventional high-fastness disperse black dyes currently on the market are prone to sublimation migration during high-temperature setting after dyeing, leading to residual dye and reduced color fastness. This makes it difficult to meet the stringent standards for water fastness and wash fastness in high-end home textiles, apparel fabrics, and outdoor textiles. To achieve the required color fastness, current dyeing and finishing processes generally employ a "two-wash, two-set" process: a reduction wash after dyeing, followed by high-temperature setting, then a second reduction wash, and finally low-temperature setting. This traditional process not only significantly increases water, electricity, and steam consumption and wastewater discharge but also significantly reduces production efficiency, making it difficult to adapt to the industry's demand for short-process, low-energy-consumption manufacturing. Furthermore, existing high-fastness disperse black dyes still suffer from insufficient water fastness and poor soaping resistance in dark-colored dyeing systems, failing to meet the dual requirements of color fastness and production efficiency, thus becoming a common technical bottleneck in the industry.

[0004] This invention focuses on the research and application of high-foaming-fastness disperse black dyes. By optimizing the dye molecular structure, compounding system, and application process, a disperse black product specifically adapted to the "one wash, one solution" process has been developed, solving the technical bottleneck of balancing color fastness and production efficiency in dark dyeing. The implementation of this invention will help optimize the dye product structure, enhance the market supply capacity of domestically produced high-end dyes, strengthen the market competitiveness and sustainable development capabilities of enterprises, effectively reduce the production and processing costs of printing and dyeing enterprises, improve the overall operational efficiency of the industrial chain, promote the industry's transformation towards resource-saving and environmentally friendly practices, and provide strong support for achieving high-quality development and green production in the textile industry. Summary of the Invention

[0005] In view of this, the present invention provides a high water fastness disperse black dye composition and its application.

[0006] The disperse black dye mixture of the present invention is a multi-component synergistic compound, and the compound combination is novel.

[0007] This invention is not a conventional color combination of existing disperse dyes, but an integrated technical solution based on molecular structure design, component screening, ratio optimization, and auxiliary agent adaptation. By precisely matching the affinity, coloring rate, thermal stability, and dispersion compatibility of each component, complementary and synergistic performance is achieved, and the overall effect far exceeds that of using each component alone or conventional compounding.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A high-foaming-fastness disperse black dye composition, comprising, by weight percentage: component A 15-35%, component B 5-20%, component C 5-25%, component D 10-25%, and auxiliaries 35-60%; The structure of component A is shown in equation (I): (I) In formula (I): R1 and R2 are each independently selected from -H, -NO2, -CN, and halogen; R3 is selected from -H, -OCH3; R4 and R5 are each independently selected from benzyl, -C1-C4 alkyl, or -(CH2). n CN, n=1, 2 or 3; The structure of component B is shown in formula (II): (II) R6 is selected from -H, C1-C4 alkyl, and C1-C4 alkoxy; R7 and R8 are each independently selected from -(CH2). n COOCH3, n = 1, 2, 3 or -CH2CH2O(CH2O) n CH3, n=0, 1, 2.

[0010] The structure of component C is shown in formula (III): (III) R9 is selected from -NHCOCH3, -H, and -CH3; R 10 Selected from benzyl or benzoyloxyethyl; The structure of component D is shown in formula (IV): (IV) R 11 R 12 Each is independently selected from cyanoethyl or benzyl.

[0011] Preferably, component A is selected from any two or more of the following structures: (I-1) (I-2) (I-3) (I-4) (I-5) (I-6).

[0012] Preferably, component B is selected from any one or more of the following structures: (II-1) (II-2) (II-3) (II-4)

[0013] Preferably, component C is selected from any one or more of the following structures: (III-1) (III-2) (III-3)

[0014] Preferably, component D is selected from any one or more of the following structures: (IV-1) (IV-2) (IV-3)

[0015] Preferably, the additive is selected from one or more of dispersants, diffusion agents, and surfactants.

[0016] Preferably, the additive is selected from one or more of the following: naphthalene sulfonic acid formaldehyde condensate (such as dispersant NNO), methyl naphthalene sulfonic acid formaldehyde condensate (dispersant MF), alkyl naphthalene sulfonic acid formaldehyde condensate, benzyl naphthalene sulfonic acid formaldehyde condensate (such as CNF), and lignin sulfonates (such as lignin S-29, 85A).

[0017] The disperse dye monomers selected in this invention, components A, C, and D, introduce benzyl substituents onto the amino nitrogen atoms of their coupling components, instead of traditional alkyl, hydroxyalkyl, alkoxy, or carboxyl groups. Benzyl groups can form strong π-π interactions with polyester fibers, significantly improving dye uptake and sublimation fastness. Simultaneously, the steric hindrance effect of benzyl groups effectively inhibits the thermal migration behavior of the dye, solving the industry pain point of severe thermal migration and insufficient color fastness in dark-colored dyeing with traditional alkyl-substituted dyes. Component B uses a benzisothiazolium azo dye, with ester or ether long chains introduced onto the amino nitrogen atoms of the azo component, exhibiting good compatibility with benzyl-structured dyes and improving the stability of the dye compounding system.

[0018] Some single-component dyes have chemical structures that differ substantially from those of monochromatic dyes disclosed in existing patents. For example, in component A and component C of publication number CN122011802A, the diazo component uses a cyano group to replace the benzene ring. Compared to halogen substituents, the cyano group has a stronger electron-withdrawing effect, which can significantly enhance the dark color effect of the dye, giving it a purer and brighter hue and a higher molar absorptivity. At the same time, the cyano group can improve the dye's resistance to sunlight, washing, and sublimation. For products with halogen-free environmental protection requirements, halogen-free structures can be preferred for blending, avoiding the defect of halogen substituents releasing toxic halides during high-temperature processes, resulting in better product stability and application safety. In component B and component B of publication number CN122011802A, the coupling component does not introduce a benzyl group on the amino nitrogen atom, but instead introduces an ester group or a long chain of ether, which has a buffering and stabilizing effect on the blending system, increasing the dye's leveling and migration properties and reducing color spots and patches in actual use.

[0019] As can be seen from the above technical solution, compared with the prior art, the present invention has the following technical effects: 1. It has good lifting power and dyeing depth.

[0020] 2. The product is flexible in its formulation and can be formulated with low-halogen or halogen-free high-fastness black.

[0021] 3. Excellent color fastness, especially water fastness.

[0022] 4. Applicable to polyester fibers and their blended fabrics. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1The images show the water fastness effect at a 4% staining depth, from left to right: blank, comparative example 1, and examples 1 to 10. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Examples 1-10 The composition ratios in Example 1-0 are shown in Table 1: Table 1: Examples 1-10 (Unit: mass percentage)

[0027] Data detection: Dyed fabric: 100% 75D polyester knitted fabric; Enhancement test: Dye solutions were prepared using dye samples from examples 1-10 at concentrations of 0.5%, 1%, 2%, 3%, 4%, 6%, and 8% (owf). The pH of the dye solutions was adjusted to 4-4.5, and dyeing was performed using a high-temperature, high-pressure dyeing method. The Integ value of the fabric surface was then tested. Wash fastness: GB / T 3921.3, eqv ISO 105 C03; Perspiration fastness: GB / T 3922, eqv ISO 105 E04; Sublimation fastness: GB / T 5718, eqv ISO 105 P01; Water fastness: 3g / L laundry detergent, liquor ratio 1:50, 95℃×5min.

[0028] Comparative Example 1: Disperse Black HWT.

[0029] The test results are shown in Tables 2 and 3. Figure 1 .

[0030] Table 2 Lifting Force, 100% 75D Polyester Knit

[0031] Table 3. Coloring Depth (4%): Washing Fastness, Perspiration Fastness, Sublimation Fastness

[0032] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-foaming-fastness disperse black dye composition, characterized in that, By mass percentage, it includes: component A 15-35%, component B 5-20%, component C 5-25%, component D 10-25%, and additives 35-60%; The structure of component A is shown in equation (I): （I） In formula (I): R1 and R2 are each independently selected from -H, -NO2, -CN, and halogen; R3 is selected from -H, -OCH3; R4 and R5 are each independently selected from benzyl, -C1-C4 alkyl, or -(CH2). n CN, n=1, 2 or 3; The structure of component B is shown in formula (II): (II) R6 is selected from -H, C1-C4 alkyl, and C1-C4 alkoxy; R7 and R8 are each independently selected from -(CH2). n COOCH3, n = 1, 2, 3 or -CH2CH2O(CH2O) n CH3, n=0, 1, 2. The structure of component C is shown in formula (III): (III) R9 is selected from -NHCOCH3, -H, and -CH3; R 10 Selected from benzyl or benzoyloxyethyl; The structure of component D is shown in formula (IV): (IV) R 11 R 12 Each is independently selected from cyanoethyl or benzyl.

2. The high water fastness disperse black dye composition according to claim 1, characterized in that, Component A is selected from any two or more of the following structures: (I-1） (I-2) (I-3) (I-4) (I-5) (I-6)。 3. The high water fastness disperse black dye composition according to claim 1, characterized in that, Component B is selected from any one or more of the following structures: (II-1) (II-2) (II-3) (II-4)。 4. The high water fastness disperse black dye composition according to claim 1, characterized in that, The component C is selected from any one or more of the following structures: (III-1) (III-2) (III-3)。 5. The high water fastness disperse black dye composition according to claim 1, characterized in that, The component D is selected from any one or more of the following structures: (IV-1) (IV-2) (IV-3)。 6. The high water fastness disperse black dye composition according to claim 1, characterized in that, The additives are selected from one or more of dispersants, diffusion agents, and surfactants.

7. The high water fastness disperse black dye composition according to claim 1, characterized in that, The additive is selected from one or more of the following: naphthalene sulfonic acid formaldehyde condensate, methyl naphthalene sulfonic acid formaldehyde condensate, alkyl naphthalene sulfonic acid formaldehyde condensate, benzyl naphthalene sulfonic acid formaldehyde condensate, and lignin sulfonate.

8. The use of the high water fastness disperse black dye composition according to any one of claims 1-7 in polyester fibers and their blended fabrics.

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