Environment-friendly liquid dispersion turquoise blue dye and preparation method thereof

Abstract

This application relates to the field of dye technology, and provides an environmentally friendly liquid dispersed turquoise blue dye and its preparation method. The preparation method includes: dividing a dispersant into two parts, adding the first part of the dispersant to the turquoise blue dye raw material, and performing a first stirring treatment and a heat preservation treatment sequentially to obtain a pre-dispersed slurry; mixing deionized water, the second part of the dispersant, a wetting agent, and a pH adjuster to obtain an hydration liquid, adding the hydration liquid to the pre-dispersed slurry for hydration treatment to obtain a dispersed turquoise blue slurry; mixing nanocellulose, deionized water, and tannic acid to obtain a premixed liquid, grinding the dispersed turquoise blue slurry and adding it to the premixed liquid, performing a second stirring treatment, and then adding a humectant, an antifoaming agent, and a preservative, and mixing to obtain the environmentally friendly liquid dispersed turquoise blue dye. This invention, by adding the dispersant in two parts, allows the dispersant to be adsorbed onto the surface of the turquoise blue dye particles, reducing particle agglomeration and improving the slurry refinement efficiency and particle size distribution uniformity.

Description

Technical Field

[0001] This invention relates to the field of dye technology, and more specifically, to an environmentally friendly liquid disperse turquoise blue dye and its preparation method. Background Technology

[0002] Disperse turquoise blue dyes, due to their vibrant blue-green color and high coloring strength, have significant application value in textile printing and dyeing, digital printing, and pigment preparation. With the increasing demands for energy conservation, emission reduction, low dust levels, automated feeding, and clean production in the printing and dyeing industry, traditional powdered disperse dyes are gradually evolving towards liquid, high-concentration, and environmentally friendly formulations. Liquid disperse turquoise blue dyes offer advantages over powdered products, including ease of use, less dust, easier metering, and easier dispersion. However, they are essentially still a dispersion system of hydrophobic organic dye particles in an aqueous phase, thus placing higher demands on particle size, dispersant adsorption state, storage stability, and the environmental friendliness of the system.

[0003] Currently, liquid disperse turquoise blue dyes are typically prepared by mixing disperse turquoise blue dye, dispersant, wetting agent, water, and other auxiliaries, followed by stirring, shearing, and grinding. This method is relatively simple and can reduce the dye particle size to some extent, improving the dye's dispersibility in the aqueous phase. However, during synthesis, filtration, drying, or wet filter cake storage, disperse turquoise blue dye raw materials are prone to forming dense coarse agglomerates. The pores and newly formed surfaces within these agglomerates are not easily wetted and covered by the aqueous phase and dispersant in a timely manner. Furthermore, the dispersant has difficulty fully penetrating the internal interface of the coarse agglomerates, potentially leading to uneven dispersant coverage, insufficient protection of the newly formed interface, long grinding time, and wide particle size distribution during subsequent grinding processes.

[0004] In view of this, there is an urgent need to provide a new environmentally friendly liquid dispersed turquoise blue dye and its preparation method, which can improve the dispersibility and stability of turquoise blue dye without simply relying on increasing the amount of auxiliaries and the grinding intensity. Summary of the Invention

[0005] The present invention aims to provide an environmentally friendly liquid dispersed turquoise blue dye and its preparation method.

[0006] To address the above problems, this invention provides a method for preparing an environmentally friendly liquid dispersed turquoise blue dye, comprising the following steps: S100. Divide the dispersant into two parts, add the first part of the dispersant to the turquoise dye raw material, and perform the first stirring treatment and heat preservation treatment in sequence to obtain the pre-dispersed slurry. S200. Deionized water, the second dispersant, wetting agent and pH adjuster are mixed to obtain an hydrated solution. The hydrated solution is added to the pre-dispersed slurry for hydration treatment to obtain a dispersed turquoise slurry. S300: After mixing nanocellulose, deionized water and tannic acid to obtain a premix, the dispersed turquoise slurry is ground and then added to the premix. After a second stirring treatment, a humectant, defoamer and preservative are added and mixed to obtain an environmentally friendly liquid dispersed turquoise dye. The mass ratio of the first dispersant to the second dispersant is (1-4):1; the wetting agent is a bio-based glycolipid wetting agent.

[0007] In one optional embodiment, the method for preparing the dispersant includes the following steps: S110. Mix lignin sulfonate dispersant, naphthalene sulfonate formaldehyde condensate dispersant and stabilizer, add deionized water for dispersion treatment, and obtain initial dispersant mixture. S120, adjust the pH of the initial mixture of dispersant, and then perform aging and filtration treatments in sequence to obtain the dispersant.

[0008] In an optional embodiment, the mass ratio of the lignin sulfonate dispersant, the naphthalene sulfonate formaldehyde condensate dispersant, and the stabilizer is 1:(0.2-1):(0.07-0.7); and / or the lignin sulfonate dispersant includes at least one or a combination of sodium lignin sulfonate, calcium lignin sulfonate, and ammonium lignin sulfonate; and / or the naphthalene sulfonate formaldehyde condensate dispersant includes at least one or a combination of sodium methylene bisnaphthalene sulfonate, sodium methylene naphthalene sulfonate, and methylene bisnaphthalene sulfonate; and / or the stabilizer includes polyvinylpyrrolidone or polyethylene glycol.

[0009] In one optional embodiment, the dispersion treatment is carried out at a temperature of 20-50°C for 30-90 min; and / or the aging treatment is carried out at a temperature of 30-60°C for 0.5-2 h; and / or the pH of the initial mixture of dispersant is adjusted to 6-8.

[0010] In an optional embodiment, in S120, the filtration process is carried out using a 100-300 mesh sieve; and / or the pH of the initial dispersant mixture is adjusted using at least one or a combination of sodium hydroxide, sodium carbonate, sodium bicarbonate, and ammonia water.

[0011] In an optional embodiment, in S300, the nanocellulose includes nano-protocellulose or nanocrystalline cellulose; and / or the mass ratio of nanocellulose to tannic acid is 1:(0.01-3).

[0012] In one optional embodiment, the heat treatment is carried out at a temperature of 20-40°C for 30-90 minutes; and / or after grinding, the D50 particle size of the dispersed turquoise slurry is 100-200 nm.

[0013] In an optional embodiment, the preparation method further includes: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding an ethanol-water mixed solvent.

[0014] In one optional embodiment, the environmentally friendly liquid dispersed turquoise blue dye comprises, by weight,: turquoise blue dye: 20-45 parts, dispersant: 1-5 parts, wetting agent: 0.02-0.3 parts, humectant: 2-10 parts, defoamer: 0.02-0.3 parts, preservative: 0.02-0.2 parts, pH adjuster: 0.05-0.5 parts, and deionized water: balance, to a total of 100 parts.

[0015] The present invention also provides an environmentally friendly liquid dispersed turquoise blue dye, which is prepared by any of the preparation methods described above.

[0016] Beneficial effects This invention provides an environmentally friendly liquid dispersed turquoise blue dye and its preparation method. A compound dispersant, composed of lignin sulfonate dispersants, naphthalene sulfonate formaldehyde condensate dispersants, and stabilizers, is used in conjunction with turquoise blue raw material washing and ethanol-water solvent exchange, dispersant pre-adsorption, hydration and expansion of the hydrated liquid, and grinding followed by the addition of nanocellulose and tannic acid. This allows the dispersant to possess anionic electrostatic stabilization, aromatic structure adsorption, and steric stabilization effects, enabling it to act more fully and uniformly on the surface of turquoise blue dye particles. This reduces the risk of particle agglomeration and grinding coarsening, improving slurry refinement efficiency and particle size distribution uniformity. Simultaneously, the weak network structure formed by nanocellulose and tannic acid further inhibits particle sedimentation and storage coarsening, improving the thermal storage stability, anti-settling properties, and layer uniformity of the liquid dye. This results in an environmentally friendly liquid dispersed turquoise blue dye that exhibits uniform dispersion, storage stability, bright color, high dyeing rate, and low residual COD, all achieved with a low auxiliary agent load. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, a detailed description of specific embodiments of the present invention will be provided below.

[0018] Unless otherwise specified, all reagents and raw materials used in this invention are commercially available. Experimental methods in the following examples that do not specify particular conditions should be performed according to conventional methods and conditions, or as selected in the product instructions.

[0019] Disperse turquoise blue dye is widely used due to its bright color and high intensity. As the dyeing and printing industry transforms towards energy conservation, emission reduction, and automated production, its formulation is shifting from powder to liquid. While liquid dyes offer advantages such as dust-free operation, easy metering, and easy dispersion, they are essentially a dispersion system of hydrophobic particles in an aqueous phase, requiring extremely high precision in particle size and stability. However, in existing processes, dye raw materials tend to form dense agglomerates, and dispersants cannot penetrate deep into these agglomerates, resulting in uneven coverage, low grinding efficiency, and coarsening during storage.

[0020] Related technologies typically reduce the risk of coarsening and sedimentation by increasing the amount of dispersant, increasing grinding intensity, extending grinding time, or adding thickeners and stabilizers. However, simply increasing the amount of dispersant will increase the content of free auxiliaries in the system, which can easily lead to problems such as increased foaming, increased COD of dyeing residue, and increased post-treatment cleaning burden, which is not conducive to the development of environmentally friendly liquid dye products. Simply increasing the grinding intensity or extending the grinding time will increase energy consumption and may lead to system temperature rise, changes in particle surface state, or further coarsening of high specific surface area particles. While adding thickeners directly can reduce sedimentation rate to some extent, if the thickener is added before grinding, it can easily increase the viscosity of the slurry, hindering the effective action of the grinding media on the dye particles, resulting in decreased grinding efficiency and coarse particle residue. If the thickener does not react evenly with the dye particles or dispersant, it may also cause local gelation, flocculation, or color fluctuations.

[0021] This invention provides an environmentally friendly liquid dispersed turquoise blue dye and its preparation method. A dispersant with both electrostatic stability and aromatic adsorption is prepared, and the dispersant is used in stages for interfacial pre-adsorption and secondary hydration development of turquoise blue dye raw materials. At the same time, a weak network stabilizing system formed by nanocellulose and tannic acid is introduced after grinding, thereby obtaining a liquid dispersed turquoise blue dye with fine particle size, good storage stability and low auxiliary agent load.

[0022] Specifically, the present invention provides an environmentally friendly liquid dispersed turquoise blue dye, comprising, by weight: turquoise blue dye (by dry weight): 20-45 parts, dispersant: 1-5 parts, wetting agent: 0.02-0.3 parts, humectant: 2-10 parts, defoamer: 0.02-0.3 parts, preservative: 0.02-0.2 parts, pH adjuster: 0.05-0.5 parts, and deionized water: balance, to a total of 100 parts.

[0023] In liquid dispersed turquoise dyes, the dispersant needs to simultaneously perform three functions: First, it needs to provide charge repulsion in the aqueous phase, reducing the probability of particles approaching each other and flocculating; second, it needs to possess a certain aromatic structure or hydrophobic adsorption structure to improve its adsorption capacity on the surface of hydrophobic aromatic particles of the dispersed turquoise dye; third, it needs to form a steric hindrance layer on the outside of the particles to reduce the re-aggregation of fine particles due to collisions during storage after grinding. However, a single dispersant often only focuses on one of the functions and cannot achieve all of the above. Therefore, this invention pre-prepares a dispersant that simultaneously possesses the above three functions. After entering the turquoise dye system, the lignin sulfonate dispersant provides electrostatic stability and an environmentally friendly framework, the naphthalene sulfonate formaldehyde condensate dispersant provides aromatic adsorption, and the stabilizer provides steric hindrance, thereby improving the effective utilization rate of the dispersant for turquoise particles, reducing free auxiliaries, and improving particle stability during subsequent hydration and grinding processes.

[0024] In view of this, the preparation method of the dispersant includes the following steps: S110. Mix lignin sulfonate dispersant, naphthalene sulfonate formaldehyde condensate dispersant and stabilizer, add deionized water for dispersion treatment, and obtain initial dispersant mixture. S120, adjust the pH of the initial mixture of dispersant, and then perform aging and filtration treatments in sequence to obtain the dispersant.

[0025] Preferably, the dispersion treatment in step S110 is to ensure that the lignin sulfonate dispersant, naphthalene sulfonate formaldehyde condensate dispersant, and stabilizer are fully dissolved, dispersed, and homogenized, so as to avoid excessively high local concentrations or uneven distribution when they are subsequently added to the dye slurry. The dispersion treatment temperature is 20-50℃ and the time is 30-90min, which can improve the uniformity of the compound without causing component degradation or significant thickening. Subsequently, in step S120, pH adjustment and aging treatment are carried out to ensure that the anionic components such as lignin sulfonate and naphthalene sulfonate are in a suitable ionization state, and to form a relatively stable hydrated compound state between the stabilizer and the anionic dispersion components. The aging treatment temperature is 30-60℃ and the time is 0.5-2h, which can make the compound system tend to be homogeneous and stable. The pH is adjusted to 6-8 to balance the stability of the dispersant in the aqueous phase and the color stability of the subsequent turquoise dye. The filtration treatment is carried out with a 100-300 mesh sieve to remove incompletely dissolved coarse particles or impurities, and to prevent them from entering the subsequent grinding system and becoming coarse particle residues or sedimentation nuclei.

[0026] Furthermore, lignin sulfonate dispersants, as the main dispersants, contain an aromatic skeleton, sulfonate groups, and a certain amount of polar groups such as hydroxyl and carboxyl groups in their structure. On the one hand, sulfonate groups can provide anionic charges in the aqueous phase, causing electrostatic repulsion on the surface of dye particles. On the other hand, lignin itself is derived from natural lignin, which has good environmental properties and cost advantages. Therefore, using lignin sulfonate as the main component of the compound dispersant can provide basic wetting, dispersion, and environmental protection support for liquid-dispersed turquoise blue dyes. Preferably, it includes at least one or a combination of sodium lignin sulfonate, calcium lignin sulfonate, and ammonium lignin sulfonate. Naphthalene sulfonate formaldehyde condensate dispersants, used as anchoring and reinforcing components, contain naphthalene ring structures and sulfonate groups in their molecules. Disperse turquoise dyes typically possess hydrophobic aromatic conjugated structures. While lignin sulfonates alone can provide anionic dispersion, their targeted adsorption to the aromatic hydrophobic regions on the surface of turquoise dye particles may be insufficient. Therefore, introducing naphthalene sulfonate formaldehyde condensate dispersants can generate hydrophobic interactions, π-π interactions, or van der Waals interactions with the aromatic structures on the surface of turquoise dye particles, thereby enhancing the adhesion of the dispersant to the dye particle surface. This makes it easier for the dispersant to be fixed on the dye particle surface, reducing free dispersant and improving the protection of newly formed interfaces during grinding. Preferably, it includes at least one or a combination of sodium methylene bis(naphthalene) sulfonate, sodium methylene naphthalene sulfonate, and methylene bis(naphthalene) sulfonate. Introducing polyvinylpyrrolidone or polyethylene glycol as stabilizers can reduce the probability of direct contact and secondary aggregation between particles, thereby improving the anti-coarsening and storage stability of the dispersion slurry. The preferred mass ratio of lignin sulfonate dispersant, naphthalene sulfonate formaldehyde condensate dispersant, and stabilizer is 1:(0.2-1):(0.07-0.7).

[0027] In the process of preparing environmentally friendly liquid dispersed turquoise blue dye, the turquoise blue dye raw materials must first be pretreated, namely: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding an ethanol-water mixed solvent.

[0028] Preferably, since certain electrolytes and impurities usually remain in the interparticle spaces of disperse turquoise blue raw materials, these substances can affect the adsorption of the dispersant on the surface of the dye particles. Washing with deionized water can remove residual inorganic salts, mother liquor, small molecule byproducts, unreacted intermediates, and some soluble impurities from the turquoise blue raw materials, thereby improving the effective adsorption rate of the dispersant, reducing the risk of particle flocculation and coarsening, and simultaneously reducing the soluble impurities and residual COD burden in the final liquid dye. Disperse turquoise blue dye is a hydrophobic organic dye particle. When directly exposed to a pure water environment, the wetting ability of water on the particle surface and the internal pores of coarse aggregates is limited, easily resulting in the outer layer being wetted by water while the interior remains tightly aggregated. After washing, an ethanol-water mixture is added. The solvent undergoes solvent exchange treatment. The surface tension of the ethanol-water mixed solvent is lower than that of pure water, and ethanol has better interfacial compatibility with the surface of hydrophobic aromatic dyes. Therefore, it is easier to enter the pores and gaps inside the particle agglomerates, replacing the aqueous phase, brine, or mother liquor originally trapped inside the filter cake. The internal interface of the coarse agglomerates is more easily opened, making it easier for the dispersant to enter the internal interface of the particles and complete adsorption, avoiding the dispersant only coating the outer layer while the internal interface is exposed. Furthermore, after the ethanol-water mixed solvent enters the pores of the dispersed turquoise raw material, it can change the pore liquid composition, reduce capillary action and interparticle adhesion strength, and change the agglomerates from a compact state to a more loose state, making the subsequent first stirring treatment and heat preservation pre-adsorption easier to perform. In the ethanol-water mixed solvent, the mass ratio of ethanol to water is preferably 1:(0.6-2.3).

[0029] This invention provides a method for preparing an environmentally friendly liquid disperse turquoise blue dye, characterized by comprising the following steps: S100. Divide the dispersant into two parts, add the first part of the dispersant to the turquoise dye raw material, and perform the first stirring treatment and heat preservation treatment in sequence to obtain the pre-dispersed slurry. S200. Deionized water, the second dispersant, wetting agent and pH adjuster are mixed to obtain an hydrated solution. The hydrated solution is added to the pre-dispersed slurry for hydration treatment to obtain a dispersed turquoise slurry. S300: After mixing nanocellulose, deionized water and tannic acid to obtain a premix, the dispersed turquoise slurry is ground and then added to the premix. After a second stirring treatment, a humectant, defoamer and preservative are added and mixed to obtain an environmentally friendly liquid dispersed turquoise dye.

[0030] Turquoise blue dye is typically a hydrophobic organic dye particle, which is prone to coarse agglomeration due to van der Waals forces, hydrophobic interactions, and capillary compression during raw material filtration, drying, or storage. If turquoise blue dye raw material is directly mixed with a large amount of water and all the dispersant in one go, the dispersant tends to disperse in the external aqueous phase first, or only adsorb onto the outer layer of the coarse agglomerates, making it difficult to penetrate into the internal interface of the agglomerates in time. During subsequent grinding, as the particles are broken down and new surfaces are created, if the new interfaces are not covered in time, secondary agglomeration, particle size coarsening, sedimentation, or stratification can easily occur.

[0031] In view of this, the present invention divides the dispersant into two parts. The first part of the dispersant acts on the surface of the turquoise dye particles and coarse agglomerates in step S100, so as to initially wet, loosen and pre-stabilize them. The second part of the dispersant is added with the hydration solution in step S200 to supplement and protect the interfaces that are not fully covered during the hydration and unfolding process, and to compensate for the adsorption on the surface of newly formed particles during the subsequent grinding process. The mass ratio of the first part of the dispersant to the second part of the dispersant is (1-4):1. The higher proportion of the first part of the dispersant can ensure that there is enough dispersant to cover the surface of the turquoise dye raw material in the pre-adsorption stage, reducing the interfacial binding force of the coarse agglomerates. The appropriate proportion of the second part of the dispersant can continue to play a supplementary adsorption role in the hydration and grinding stages. If the first part of the dispersant is too small, the pre-adsorption is insufficient and the coarse agglomerates are difficult to loosen sufficiently. If the second part of the dispersant is too small, the newly formed interfaces generated during the hydration and grinding process cannot be effectively protected. If the second part of the dispersant is too large, it may cause an increase in the free dispersant in the system, which is not conducive to reducing the auxiliary agent load and improving environmental protection.

[0032] Preferably, in step S100, a first dispersant is added to the turquoise dye raw material, followed by a first stirring and heat preservation treatment. Since the free water phase in the system is relatively small at this point, the dispersant is more likely to concentrate on the interface of the turquoise dye particles, rather than remaining largely free in the aqueous phase. The first stirring treatment allows the dispersant to gradually contact the dye particle surface and enter some of the gaps in the particle agglomerates; the heat preservation treatment provides time for the dispersant molecules to diffuse, orient, and adsorb on the particle surface, allowing them to more fully cover the dye particle surface. Through this step, the dispersant can reduce the surface energy of the turquoise dye particles, weaken the agglomeration between particles, and make it easier to open the agglomerates during subsequent hydration and grinding processes, reducing coarsening and sedimentation caused by insufficient particle surface protection. The heat preservation treatment temperature is 20-40℃, and the time is 30-90 minutes, which can improve the effective adsorption rate of the dispersant, make the pre-dispersed slurry more uniform, and reduce the residual coarse agglomerates in subsequent hydration and grinding. The first dispersant is preferably added in 2-4 portions. After each addition, the mixture should be stirred for 10-15 minutes. This allows the dispersant to gradually penetrate into the pores and gaps between the dye particles. After each addition, the system has a certain amount of time to complete wetting, diffusion, and adsorption. The next addition of dispersant then continues to act on the interface that has not yet been fully covered. This can prevent the dispersant from concentrating in the outer aqueous phase or local areas, thereby increasing the effective adsorption ratio of the dispersant on the surface of the turquoise dye particles.

[0033] Preferably, after step S100, the dispersant has been initially adsorbed onto the surface of the turquoise dye particles, but the system is still in a pre-dispersed state with a high concentration. The hydrophilic segments on the particle surface have not yet fully extended, and the system's fluidity and aqueous phase stability are not yet sufficient. If a large amount of deionized water is added directly at this time, it may cause the outer slurry to dilute rapidly while the internal agglomerates have not fully expanded, resulting in local concentration differences and uneven hydration. Therefore, in step S200, the second part of dispersant, wetting agent, and pH adjuster are pre-prepared into a hydration solution, so that the aqueous phase added to the system itself has wetting, dispersing, and pH adjustment functions. When water enters the interparticle gaps, the second part of dispersant and wetting agent can act simultaneously on the surface of the dye particles, causing the hydrophilic part of the adsorbed dispersant to gradually hydrate and extend, while supplementing and protecting the new interfaces that have not yet been fully covered. This can improve the hydration uniformity and fluidity of the slurry, reduce local agglomeration, soft agglomeration, and insufficient hydration, and provide a more uniform and stable slurry base for subsequent grinding. The hydration solution is preferably added in three stages. The first stage involves adding 30-40 wt.% of the total hydration solution, followed by stirring for 10-15 minutes to loosen the pre-dispersed slurry from its high concentration state. The second stage involves adding another 30-40 wt.% of the total hydration solution, followed by stirring for 10-15 minutes to further expand the particles and replenish the dispersant. The third stage involves adding the remaining hydration solution and stirring for 20-30 minutes to bring the system to the final suitable concentration and flowability for grinding. The mixture is then allowed to stand for 15-60 minutes to promote water diffusion into the soft aggregates and to allow the hydrophilic segments of the dispersant to fully hydrate and extend, improving the stability and uniformity of the slurry before grinding and reducing the risk of coarse particle residue and particle size re-coarsening after grinding. The resulting dispersed turquoise slurry has a pH range of 5.8-6.8.

[0034] Furthermore, the wetting agent is a bio-based glycolipid wetting agent. Bio-based glycolipid wetting agents typically have a hydrophilic glycosyl group and a hydrophobic fatty chain structure. The hydrophobic chain segment can generate a certain compatibility with the hydrophobic surface of the dispersed turquoise dye, while the hydrophilic glycosyl group faces the aqueous phase, which helps to reduce the interfacial tension between the aqueous phase and the dye particles. By reducing the interfacial tension, the hydrated liquid can spread more easily and enter the pores and gaps of the dye aggregates, making the internal particle surfaces easier to wet and open. The bio-based glycolipid wetting agent is used in conjunction with the second dispersant. The wetting agent is mainly responsible for improving interfacial wetting and promoting the entry of the hydrated liquid into the interior of the aggregates, while the dispersant is responsible for forming a stable adsorption layer on the wetted and opened particle surface. This can improve the hydration rate and hydration uniformity, and reduce coarse aggregate residue. In addition, the bio-based glycolipid wetting agent also helps to improve the environmental properties of the product.

[0035] Preferably, after the aforementioned steps, the turquoise dye particles are initially covered by the dispersant and gradually unfold under the action of the hydration solution, reducing the binding strength of coarse agglomerates and improving the fluidity and uniformity of the system. At this point, further grinding allows energy to be more effectively applied to the dye particles themselves, rather than being largely consumed in breaking up large, unwetted agglomerates. Simultaneously, the first dispersant provides pre-protection to the original particle surface, and the second dispersant compensates for the adsorption of newly formed interfaces during hydration and grinding. Therefore, the newly formed fine particle surfaces during grinding can receive dispersant protection more promptly, reducing the risk of re-agglomeration after grinding. After grinding, the D50 particle size of the dispersed turquoise dye slurry is 100-200 nm, ensuring sufficiently fine particles that contribute to bright color, uniform dispersion, and storage stability; while avoiding the high energy consumption, high specific surface area coarsening, and increased auxiliary agent dosage caused by excessive grinding.

[0036] Preferably, in step S300, nanocellulose, deionized water, and tannic acid are first mixed to prepare a premix, which is then added to the ground dispersed turquoise slurry. This is to ensure that the nanocellulose and tannic acid form a relatively uniform hydrated dispersion before entering the dye system. Nanocellulose has a high aspect ratio, abundant hydroxyl groups, and a certain ability to build spatial networks. If added before grinding, it will increase the viscosity of the slurry, affecting the transfer of grinding media or grinding energy, reducing particle refinement efficiency. At the same time, the fibrous structure of nanocellulose may also encapsulate coarse particle agglomerates, hindering the direct action of grinding energy on dye particles, resulting in prolonged grinding time or a wider particle size distribution. Tannic acid contains multiple phenolic hydroxyl groups, which can form multi-point hydrogen bonds with the hydroxyl groups on the surface of nanocellulose. If nanocellulose and tannic acid are added directly to the dye slurry separately, nanocellulose is prone to local agglomeration, and tannic acid may also react unevenly with dye particles or dispersants due to excessively high local concentrations, resulting in local thickening, flocculation, or color fluctuations. Premixing the two components with deionized water to form a premix allows for thorough hydration and dispersion of the nanocellulose, enabling it to form a more uniform hydrogen-bonded association system with tannic acid. This allows for a gentler and more uniform construction of a stable network when added to the milled dye slurry, preventing localized agglomeration and excessive thickening. The second stirring process ensures uniform distribution of the premix, preventing the formation of localized gel lumps or high-viscosity areas, and improving the overall system's resistance to sedimentation, coarsening, and storage stability. Finally, humectants, defoamers, and preservatives are added. These additives are primarily used for storage, transportation, and performance adjustment in the finished product stage and should not be introduced too early into the interfacial pre-adsorption, hydration, or milling processes.

[0037] Furthermore, nanocellulose includes nano-protocellulose or nanocrystalline cellulose. Nano-protocellulose typically has a long, flexible fibrous structure with a high aspect ratio, making it easier to form continuous or semi-continuous spatial networks in an aqueous phase. This can increase the yield stress or microscopic support of the system in a static state, making it less likely for dye particles to settle. Nanocrystalline cellulose typically consists of shorter, more rigid rod-shaped crystal particles with more regular dimensions and better dispersibility. The increase in system viscosity is relatively controllable, making it suitable for enhancing the microscopic stability of the dispersion system without significantly increasing viscosity. Both can form hydrogen bonds with tannic acid through surface hydroxyl groups to construct a weakly stable network environment in the ground dye particle system. The mass ratio of nanocellulose to tannic acid is 1:(0.01-3), which allows tannic acid to play both hydrogen bond bridging and weak network construction roles without causing flocculation, thickening, or color interference.

[0038] Example 1

[0039] This embodiment provides a dispersant, the preparation method of which includes the following steps: S110. Calcium lignosulfonate, sodium methylene naphthalene sulfonate and polyethylene glycol are mixed in a mass ratio of 1:0.2:0.07. Deionized water is added and the mixture is stirred and dispersed at 20°C for 30 minutes to obtain the initial mixture of dispersant. S120, adjust the pH of the initial mixture of dispersant to 6, mature it at 30℃ for 0.5h, and then filter it through a 100-mesh sieve to obtain the dispersant.

[0040] Example 2

[0041] This embodiment provides a dispersant, the preparation method of which includes the following steps: S110. Sodium lignosulfonate, sodium methylene bisnaphthalenesulfonate and polyvinylpyrrolidone are mixed in a mass ratio of 1:1:0.7, deionized water is added and the mixture is stirred and dispersed at 50°C for 90 min to obtain the initial mixture of dispersant. S120, adjust the pH of the initial mixture of dispersant to 8, mature it at 60℃ for 2 hours, and then filter it through a 300-mesh sieve to obtain the dispersant.

[0042] Example 3

[0043] This embodiment provides a dispersant, the preparation method of which includes the following steps: S110. Mix ammonium lignosulfonate, methylene bisnaphthalene sulfonate and polyvinylpyrrolidone in a mass ratio of 1:0.5:0.2, add deionized water and stir and disperse at 40°C for 60 min to obtain the initial mixture of dispersant. S120, adjust the pH of the initial mixture of dispersant to 7, mature it at 40℃ for 1 hour, and then filter it through a 200-mesh sieve to obtain the dispersant.

[0044] Example 4

[0045] This embodiment provides an environmentally friendly liquid dispersed turquoise blue dye, comprising, by weight: turquoise blue dye: 20 parts, dispersant: 1 part, wetting agent: 0.02 parts, humectant: 2 parts, defoamer: 0.02 parts, preservative: 0.02 parts, pH adjuster: 0.05 parts, deionized water: balance, to a total of 100 parts.

[0046] Example 5

[0047] This embodiment provides an environmentally friendly liquid dispersed turquoise blue dye, comprising, by weight: turquoise blue dye: 45 parts, dispersant: 5 parts, wetting agent: 0.3 parts, humectant: 10 parts, defoamer: 0.3 parts, preservative: 0.2 parts, pH adjuster: 0.5 parts, deionized water: balance, to a total of 100 parts.

[0048] Example 6

[0049] This embodiment provides an environmentally friendly liquid dispersed turquoise blue dye, comprising, by weight: turquoise blue dye: 35 parts, dispersant: 4 parts, wetting agent: 0.2 parts, humectant: 8 parts, defoamer: 0.2 parts, preservative: 0.1 parts, pH adjuster: 0.3 parts, deionized water: balance, to a total of 100 parts.

[0050] Example 7

[0051] This embodiment provides a method for preparing an environmentally friendly liquid disperse turquoise blue dye, including the following steps: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding ethanol-water mixed solvent. S100. Divide the dispersant into two parts, add the first part of the dispersant to the turquoise dye raw material, and after the first stirring treatment, keep it at 20°C for 30 minutes to obtain the pre-dispersed slurry. S200. Deionized water, the second dispersant, wetting agent and pH adjuster are mixed to obtain an hydrated solution. The hydrated solution is added to the pre-dispersed slurry for hydration treatment to obtain a dispersed turquoise slurry. S300: Nano-cellulose, deionized water and tannic acid are mixed to obtain a premixed solution. The mass ratio of nano-cellulose to tannic acid is 1:0.01. The dispersed turquoise slurry is ground until the D50 particle size is 100nm and then added to the premixed solution. A second stirring treatment is carried out, and then a humectant, defoamer and preservative are added. After mixing, an environmentally friendly liquid dispersed turquoise dye is obtained. The dispersant used is the dispersant prepared in Example 1, and the mass ratio of the first part of the dispersant to the second part of the dispersant is 1:1; the wetting agent is a bio-based glycolipid wetting agent.

[0052] Example 8

[0053] This embodiment provides a method for preparing an environmentally friendly liquid disperse turquoise blue dye, including the following steps: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding ethanol-water mixed solvent. S100. Divide the dispersant into two parts, add the first part of the dispersant to the turquoise dye raw material, and after the first stirring treatment, keep it at 40°C for 90 minutes to obtain the pre-dispersed slurry. S200. Deionized water, the second dispersant, wetting agent and pH adjuster are mixed to obtain an hydrated solution. The hydrated solution is added to the pre-dispersed slurry for hydration treatment to obtain a dispersed turquoise slurry. S300: Nano-cellulose, deionized water and tannic acid are mixed to obtain a premixed solution. The mass ratio of nano-cellulose to tannic acid is 1:3. The dispersed turquoise slurry is ground until the D50 particle size is 200nm and then added to the premixed solution. A second stirring treatment is carried out, and then a humectant, defoamer and preservative are added. After mixing, an environmentally friendly liquid dispersed turquoise dye is obtained. The dispersant used is the dispersant prepared in Example 2, and the mass ratio of the first part of the dispersant to the second part of the dispersant is 4:1; the wetting agent is a bio-based glycolipid wetting agent.

[0054] Example 9

[0055] This embodiment provides a method for preparing an environmentally friendly liquid disperse turquoise blue dye, including the following steps: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding ethanol-water mixed solvent. S100. Divide the dispersant into two parts. Add the first part of the dispersant to the turquoise dye raw material. Add the first part of the dispersant in two batches. Stir for 15 minutes after each addition of the dispersant. Keep warm at 30°C for 60 minutes to obtain the pre-dispersed slurry. S200: After mixing deionized water, the second dispersant, wetting agent and pH adjuster, an hydrated solution is obtained. The hydrated solution is added to the pre-dispersed slurry in three parts. The first part is 30-40 wt.% of the total hydrated solution, and the mixture is stirred for 10-15 min. The second part is 30-40 wt.% of the total hydrated solution, and the mixture is stirred for 10-15 min. The third part is the remaining hydrated solution, and the mixture is stirred for 20-30 min. The mixture is then allowed to stand for 15-60 min to swell, resulting in a dispersed turquoise blue slurry. S300: Nanocrystalline cellulose, deionized water and tannic acid are mixed to obtain a premixed solution. The mass ratio of nanocrystalline cellulose to tannic acid is 1:1. The dispersed turquoise slurry is ground until the D50 particle size is 150nm and then added to the premixed solution. A second stirring treatment is carried out, and then a humectant, defoamer and preservative are added. After mixing, an environmentally friendly liquid dispersed turquoise dye is obtained. The dispersant used is the dispersant prepared in Example 3, and the mass ratio of the first part of the dispersant to the second part of the dispersant is 2:1; the wetting agent is a bio-based glycolipid wetting agent.

[0056] This application has undergone multiple experiments, and some of the test results are presented here for reference to further describe the invention in detail. The following is a detailed description in conjunction with specific embodiments.

[0057] Example 10

[0058] This embodiment provides a method for preparing an environmentally friendly liquid disperse turquoise blue dye, including the following steps: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding ethanol-water mixed solvent. S100. Divide the dispersant into two parts. Add the first part of the dispersant to the turquoise dye raw material. Add the first part of the dispersant in 4 portions. Stir for 15 minutes after each addition of the dispersant. Keep warm at 30°C for 60 minutes to obtain the pre-dispersed slurry. S200: After mixing deionized water, the second dispersant, wetting agent and pH adjuster, an hydrated solution is obtained. The hydrated solution is added to the pre-dispersed slurry in three parts. The first part is 30-40 wt.% of the total hydrated solution, and the mixture is stirred for 10-15 min. The second part is 30-40 wt.% of the total hydrated solution, and the mixture is stirred for 10-15 min. The third part is the remaining hydrated solution, and the mixture is stirred for 20-30 min. The mixture is then allowed to stand for 15-60 min to swell, resulting in a dispersed turquoise blue slurry. S300: Nano-cellulose, deionized water and tannic acid are mixed to obtain a premixed solution. The mass ratio of nano-cellulose to tannic acid is 1:1. The dispersed turquoise slurry is ground until the D50 particle size is 150nm and then added to the premixed solution. A second stirring treatment is carried out, and then a humectant, defoamer and preservative are added. After mixing, an environmentally friendly liquid dispersed turquoise dye is obtained. The dispersant used is the dispersant prepared in Example 3, and the mass ratio of the first part of the dispersant to the second part of the dispersant is 3:1; the wetting agent is a bio-based glycolipid wetting agent.

[0059] Comparative Example 1 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye, which differs from Example 7 in that the dispersant used is sodium methylene bisnaphthalene sulfonate.

[0060] Comparative Example 2 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that the dispersant composition is the same as in Example 1, but the dispersant is not prepared using the method of Example 1; instead, the components are directly mixed.

[0061] Comparative Example 3 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference between this example and Example 7 is that the dispersant is basically the same as that in Example 1, but polyvinylpyrrolidone is not added to the dispersant, i.e., no stabilizer is added.

[0062] Comparative Example 4 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye, which differs from Example 7 in that step S101 is omitted.

[0063] Comparative Example 5 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that only washing is performed in step S101, and no ethanol-water solvent exchange is performed.

[0064] Comparative Example 6 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that the dispersant is not divided into two parts, and all the dispersant is added in step S100.

[0065] Comparative Example 7 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that the dispersant is not divided into two parts, and all the dispersant is added in step S200.

[0066] Comparative Example 8 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that in step S300, the premixed liquid is added before grinding.

[0067] Comparative Example 9 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that, in step S300, nano-cellulose is not added to the premixed solution.

[0068] Comparative Example 10 This comparative example provides a method for preparing a liquid dispersed turquoise blue dye. The difference from Example 7 is that tannic acid is not added to the premix in step S300.

[0069] This application has undergone multiple experiments, and some of the test results are presented here for reference to further describe the invention in detail. The following is a detailed description in conjunction with specific embodiments.

[0070] Performance testing Appearance test: Take the samples of Examples 4-6 and place them in a transparent glass bottle. After standing at 25°C for 24 hours, observe the appearance and record whether it is uniform, whether there is obvious sedimentation, stratification, flocculation, clumping or coarse particles. pH test: Take 10g of the sample from Examples 4-6, dilute it with deionized water to 100g, stir well, and then test and record the pH value using a calibrated pH meter. Viscosity test: The samples from Examples 4-6 were kept at 25℃ for 30 minutes and tested using a rotational viscometer at 60 rpm. The viscosity was recorded. Particle size testing: The samples from Examples 4-6 were diluted with deionized water to a suitable concentration, and the D50 and D90 particle sizes were measured using laser particle size analysis. Foam height test: Take 1% sample dilution of Examples 4-6, shake rapidly at 25°C for 1 min, let stand for 1 min and record the foam height; The test results are shown in Table 1.

[0071] Table 1 Dispersant adsorption test: After step S100, the slurry was centrifuged, the TOC of the supernatant was tested, and the adsorption rate was calculated. The results are shown in Table 2.

[0072] Table 2 As can be seen from Table 2, the adsorption rates of Examples 7-10 are better than those of the comparative examples, especially Example 10. The adsorption rate of Comparative Example 2 is lower than that of Example 7, indicating that simply mixing the components directly is insufficient to form a uniform compound dispersion system of lignin sulfonate dispersant, naphthalene sulfonate formaldehyde condensate dispersant, and stabilizer, resulting in a low effective utilization rate of the dispersant on the surface of the turquoise particles. The adsorption rate of Comparative Example 3 further decreases, indicating that the stabilizer not only affects the stability of the aqueous phase but also facilitates the formation of a stable hydration protective layer on the particle surface of the dispersant compound system. Comparative Examples 4 and 5 show that the washing and ethanol-water solvent exchange in S101 can improve the interface state of the raw materials, making it easier for the dispersant to enter the internal interface of the particles and complete adsorption.

[0073] Grinding efficiency test: Under the same grinding conditions, the particle size data after reaching the target fineness (D50 particle size in the range of 100-200nm, D90 particle size in the range of 250-500nm) were recorded. The results are shown in Table 3.

[0074] Table 3 As can be seen from Table 3, Examples 7-10 showed narrow particle size distribution and fewer coarse particles after grinding, especially Example 10. The D90 particle size of Comparative Example 1 was significantly larger, indicating that ordinary dispersants could not achieve the refining and stabilizing effects of the dispersant in this application. Comparative Example 2 showed that even with the same components, if the dispersant was not pre-dispersed, matured, and filtered, its uniformity was insufficient, and its wetting and grinding assistance effects on the blue particles were still reduced. Comparative Example 3 showed that without a stabilizer, the protective layer on the particle surface was insufficient after grinding, and the D90 particle size was larger. Comparative Examples 4-5 showed that washing and ethanol-water solvent exchange in S101 both helped reduce coarse particle residue, and solvent exchange further contributed to improving the internal wetting of the aggregates. The D90 particle size of Comparative Example 8 was significantly increased, indicating that the early addition of nanocellulose or tannic acid would increase the viscosity of the system and interfere with the refining process.

[0075] Thermal storage stability test: Samples from Examples 7-10 and Comparative Examples 1-10 were sealed and placed in an oven at 54°C for 14 days. After cooling to room temperature, D50 and D90 were tested, and the D90 growth rate was calculated. Centrifugal sedimentation rate test: Take 20 mL of samples from Examples 7-10 and Comparative Examples 1-10 and place them in centrifuge tubes. Centrifuge at 3000 rpm for 30 min, record the volume of the bottom sedimentation layer and the total volume of the sample, and calculate the centrifugal sedimentation rate. Color difference test between upper and lower layers: After the samples of Examples 7-10 and Comparative Examples 1-10 were left to stand at room temperature for 30 days, 10% of the liquid in the upper layer and 10% of the liquid in the lower layer were taken respectively, and polyester fabrics were dyed under the same conditions. The color difference of the dyed fabrics was then tested. The results are shown in Table 4.

[0076] Table 4 As can be seen from Tables 3-4, the performance of Examples 7-10 is superior to that of Comparative Examples 1-10, especially Example 10. The D90 growth rate and sedimentation rate after heat storage in Comparative Example 2 are higher than those in Example 7, indicating that the preparation process of the compound dispersant can improve the uniformity and application stability among the various dispersing components. The heat storage growth rate and sedimentation rate of Comparative Example 3 are significantly increased, indicating that there is functional complementarity between the stabilizer and the lignin sulfonate dispersant and the naphthalene sulfonate formaldehyde condensate dispersant. The initial particle size of Comparative Examples 9-10 is similar to that of Example 7, but the heat storage growth rate and sedimentation rate are significantly increased, indicating that nanocellulose and tannic acid are not individual replaceable components, but rather improve storage stability synergistically through a weak hydrogen bond network. In Comparative Example 8, the premix was added before grinding, but the stability was not as good as that added later, indicating that adding later avoids interfering with grinding and is conducive to forming a stable network among the refined particles. Comparative Examples 6-7 all showed higher D90 growth rate and sedimentation rate, indicating that adding the dispersant in two parts can simultaneously meet the needs of pre-adsorption and protection of the newly formed interface during grinding.

[0077] Dyeing test: Polyester fabric was used for dyeing. The dyeing conditions were: dye amount 2% owf, liquor ratio 1:20, pH 5.5, heat treatment at 130℃ for 60 min. After dyeing, the fabric was washed and dried. The K / S value and C*ab chroma were measured using a colorimeter. Dye uptake test: Measure the absorbance of the dye solution before and after dyeing at the maximum absorption wavelength, and calculate the dye uptake rate; COD test of staining residue: Take the staining residue, dilute it as necessary, and test the COD value; The results are shown in Table 5.

[0078] Table 5 As can be seen from Table 5, Examples 7-10 exhibited good dyeing and environmental performance, especially Example 10, due to its suitable process and parameters. Comparative Example 1 showed significantly lower K / S values ​​and C*ab chroma, and the highest residual COD, likely due to the use of a conventional dispersant with coarser particle size and poorer dispersion stability. Comparative Example 2 showed improvement over a single conventional dispersant, but still fell short of Example 7, indicating that the pre-preparation process of the compound dispersant helps improve the uniformity of the dispersant and reduce free auxiliaries and residual COD. Comparative Example 3 showed a decrease in K / S value and dyeing rate, and an increase in COD, indicating that the stabilizer, lignin sulfonate dispersant, and naphthalene sulfonate formaldehyde condensate dispersant all contribute to the overall performance of the dispersant. Comparative Examples 9-10 showed dyeing performance close to Example 7, but significantly worse storage stability, indicating that nanocellulose and tannic acid mainly contribute to post-stabilization and anti-settling, rather than simply increasing the initial dyeing depth.

[0079] Color fastness test: The dyed fabric was tested according to the conventional textile color fastness test method, and the results are shown in Table 6.

[0080] Table 6 As shown in Table 6, the environmentally friendly liquid dispersed turquoise blue dye of the present invention achieves a wash fastness, rubbing fastness, and sublimation fastness of 4-5, indicating good dispersion uniformity and dyeing effect. Comparative Example 1, due to the use of a single conventional dispersant, exhibits poor dispersibility and particle stability, resulting in insufficient dyeing uniformity and slightly lower fastness in some areas. Comparative Example 3, lacking a stabilizer, shows a decrease in particle stability and dyeing uniformity after grinding compared to the examples. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for preparing an environmentally friendly liquid dispersed turquoise blue dye, characterized in that, Includes the following steps: S100. Divide the dispersant into two parts, add the first part of the dispersant to the turquoise dye raw material, and perform the first stirring treatment and heat preservation treatment in sequence to obtain the pre-dispersed slurry. S200: Deionized water, the second part of the dispersant, wetting agent and pH adjuster are mixed to obtain an hydrated liquid. The hydrated liquid is added to the pre-dispersed slurry for hydration treatment to obtain a dispersed turquoise slurry. S300. After mixing nanocellulose, deionized water and tannic acid to obtain a premixed liquid, the dispersed turquoise slurry is ground and then added to the premixed liquid. After a second stirring treatment, a humectant, an antifoaming agent and a preservative are added and mixed to obtain the environmentally friendly liquid dispersed turquoise dye. The mass ratio of the first part of the dispersant to the second part of the dispersant is (1-4):1; The wetting agent is a bio-based glycolipid wetting agent.

2. The preparation method according to claim 1, characterized in that, The method for preparing the dispersant includes the following steps: S110. Mix lignin sulfonate dispersant, naphthalene sulfonate formaldehyde condensate dispersant and stabilizer, add deionized water for dispersion treatment, and obtain initial dispersant mixture. S120. Adjust the pH of the initial mixture of the dispersant, and then perform aging and filtration treatments in sequence to obtain the dispersant.

3. The preparation method according to claim 2, characterized in that, The mass ratio of the lignin sulfonate dispersant, the naphthalene sulfonate formaldehyde condensate dispersant, and the stabilizer is 1:(0.2-1):(0.07-0.7); and / or The lignin sulfonate dispersant includes at least one or a combination of sodium lignin sulfonate, calcium lignin sulfonate, and ammonium lignin sulfonate; and / or The naphthalene sulfonate formaldehyde condensate dispersant includes at least one or a combination of sodium methylene bis(naphthalene sulfonate), sodium methylene naphthalene sulfonate, and methylene bis(naphthalene sulfonate); and / or The stabilizer includes polyvinylpyrrolidone or polyethylene glycol.

4. The preparation method according to claim 2, characterized in that, The dispersion treatment is performed at a temperature of 20-50℃ for a time of 30-90 minutes; and / or The ripening treatment is performed at a temperature of 30-60℃ for a time of 0.5-2 hours; and / or The pH of the initial mixture of the dispersant is adjusted to 6-8.

5. The preparation method according to claim 2, characterized in that, In S120, The filtration process is performed using a 100-300 mesh sieve; and / or The pH of the initial mixture of the dispersant is adjusted using at least one or a combination of sodium hydroxide, sodium carbonate, sodium bicarbonate, and ammonia water.

6. The preparation method according to claim 1, characterized in that, In S300, The nanocellulose includes nano-protocellulose or nanocrystalline cellulose; and / or The mass ratio of the nanocellulose to the tannic acid is 1:(0.01-3).

7. The preparation method according to claim 1, characterized in that, The heat preservation treatment is performed at a temperature of 20-40℃ for a time of 30-90 minutes; and / or After the grinding process, the D50 particle size of the dispersed turquoise slurry is 100-200 nm.

8. The preparation method according to claim 1, characterized in that, The preparation method further includes: S101. The turquoise raw material is washed with deionized water and then subjected to solvent exchange treatment by adding an ethanol-water mixed solvent.

9. The preparation method according to any one of claims 1-8, characterized in that, The environmentally friendly liquid dispersed turquoise blue dye comprises, by weight: turquoise blue dye: 20-45 parts, dispersant: 1-5 parts, wetting agent: 0.02-0.3 parts, humectant: 2-10 parts, defoamer: 0.02-0.3 parts, preservative: 0.02-0.2 parts, pH adjuster: 0.05-0.5 parts, and deionized water: balance, to a total of 100 parts.

10. An environmentally friendly liquid dispersed turquoise blue dye, characterized in that, It is prepared by the preparation method described in any one of claims 1-9.

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