Black polyester dyeing liquid and preparation method thereof

Abstract

The invention relates to the technical field of textile printing and dyeing, and particularly discloses a black polyester dyeing solution and a preparation method thereof. The black polyester dyeing liquid provided by the invention is prepared from the following components in parts by mass: 18 to 20 parts of dye, 1 to 1.2 parts of neutralizer, 10 to 13 parts of leveling agent and 500 to 550 parts of water, wherein the neutralizer comprises acetic acid and boric acid; the leveling agent comprises gleditsia sinensis saponin, quaternary ammonium salt modified flaxseed gum and shrimp shell powder. The black polyester dyeing solution provided by the invention takes acetic acid and boric acid as neutralizers, and takes gleditsia sinensis saponin, quaternary ammonium salt modified flaxseed gum and shrimp shell powder as leveling agents, so that the problem that the existing dark polyester is difficult to dye under a low-temperature condition is solved, and the leveling property and color fastness of the black polyester are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of textile printing and dyeing, and in particular to a black polyester dyeing solution and a preparation method thereof. Background Art

[0002] Polyester, the world's largest and most widely used synthetic fiber (accounting for approximately 70% of global synthetic fiber production), boasts high strength, abrasion resistance, easy care, and low cost, making its fabrics widely used in clothing, home textiles, and industrial textiles. However, due to the highly crystalline nature of polyester chains, strong intermolecular forces, and the lack of hydrophilic groups, conventional dyes have difficulty penetrating the fibers. Dyeing requires high temperatures and pressures of 120-135°C and 0.3-0.5 MPa. This process not only requires significant equipment investment and operating costs, but also can cause fiber shrinkage, reduced strength, and a stiffened fabric feel, severely impacting the quality of polyester fabrics. Furthermore, high-temperature dyeing has significant limitations, such as the tendency of some dyes to decompose at high temperatures, resulting in low dye uptake and poor levelness. Furthermore, fabrics dyed at high temperatures exhibit reduced color fastness after frequent washing or friction. To prevent dye degradation, some researchers have attempted to lower the dyeing temperature. However, this lowered temperature makes it difficult to achieve the desired coloring effect on dark polyester fibers and can even lead to insufficient dyeing. Therefore, it is of great significance to develop a polyester dyeing solution suitable for low temperature conditions to improve color fastness and levelness. Summary of the Invention

[0003] In view of this, the present invention provides a black polyester dyeing solution and a preparation method thereof. The black polyester dyeing solution provided by the present invention solves the problem that existing dark polyester is difficult to dye under low temperature conditions and greatly improves the levelness and color fastness of black polyester.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] The present invention provides a black polyester dyeing solution, comprising the following components in parts by weight: 18-20 parts of dye, 1-1.2 parts of neutralizer, 10-13 parts of leveling agent and 500-550 parts of water;

[0006] Wherein, the neutralizing agent includes acetic acid and boric acid;

[0007] The leveling agent comprises saponin, quaternary ammonium salt modified linseed gum and shrimp shell powder.

[0008] Compared with the prior art, the black polyester dyeing liquid provided by the present invention uses acetic acid and boric acid as neutralizing agents. The two acids are used in combination, which can not only adjust the pH value of the dyeing liquid, but also maintain the dye morphology in the dyeing liquid, enhance the wettability of the polyester fiber surface, and provide suitable conditions for the penetration of the dye.

[0009] The soap gourd saponin in the leveling agent can effectively promote the uniform dispersion of the dye, reduce the viscosity of the dyeing solution, and improve the diffusion rate of the dye; at the same time, the soap gourd saponin can also combine with impurities on the surface of the polyester fiber, reduce the interference of the impurities on the adsorption of the dye, ensure the uniform penetration of the dye into the polyester fiber, and further improve the leveling property and color fastness of the polyester fiber. The quaternary ammonium salt modified flaxseed gum can neutralize the residual negative charge on the surface of the polyester fiber, slow down the phenomenon of local over-dyeing caused by too fast dyeing, and further improve the leveling property; the quaternary ammonium salt modified flaxseed gum can also form a protective film on the surface of the polyester fiber, prevent the dye molecules from falling off from the surface of the fiber, and further improve the color fastness; in addition, the quaternary ammonium salt modified flaxseed gum and the soap gourd saponin synergistically reduce the surface tension of the dyeing solution, and promote the dye leveling property. The shrimp shell powder contains rich hydroxyl and amino groups, wherein the amino groups combine with the groups in the dye through hydrogen bond to improve the binding force between the shrimp shell powder and the dye, and the hydroxyl groups combine with the groups in the polyester fiber through van der Waals force to improve the binding force between the shrimp shell powder and the polyester fiber; the surface of the polyester fiber has tiny pores, the shrimp shell powder fills the pores to assist the dye to penetrate into the fiber, and promotes the contact between the dye and the polyester fiber; since the shrimp shell powder can slowly release active groups, the contact time between the dye and the polyester fiber is prolonged, which not only improves the leveling property, but also further improves the color fastness of the polyester fiber; the inventors have found through a large amount of research that the quaternary ammonium salt modified flaxseed gum and the soap gourd saponin can synergistically further promote the shrimp shell powder to assist the dye to penetrate into the polyester fiber, and thus greatly improve the color fastness.

[0010] The black polyester dyeing solution provided by the application uses acetic acid and boric acid as neutralizing agents, and uses soap gourd saponin, quaternary ammonium salt modified flaxseed gum and shrimp shell powder as leveling agents, solves the problem of difficult dyeing of existing dark polyester at low temperature, and greatly improves the leveling property and color fastness of black polyester.

[0011] The dye includes disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black.

[0012] Further preferably, the mass ratio of the disperse yellow brown, the disperse yellow, the disperse turquoise blue and the disperse black is (7-10):(1-2):(1-2):(25-30).

[0013] Further preferably, the disperse yellow brown is Yartong Yellow Brown SWD.

[0014] Further preferably, the disperse yellow is Disperse Yellow C-4G of Zhejiang Jihua Group Co., Ltd.

[0015] Further preferably, the disperse turquoise blue is Disperse Turquoise Blue S-GL of Hangzhou Shenli Chemical Co., Ltd.

[0016] Further preferably, the disperse black is Yartong Black SW-VIP.

[0017] Preferably, the mass ratio of acetic acid to boric acid is (7-8):(2-3).

[0018] The present invention further limits the mass ratio of acetic acid to boric acid, which is beneficial to further maintain the stability of the dyeing solution and improve the dyeing effect.

[0019] Preferably, the mass ratio of saponin, quaternary ammonium salt modified linseed gum and shrimp shell powder in the leveling agent is (2-3):(1-1.5):(1-1.5).

[0020] By limiting the mass ratio of various substances in the leveling agent, the present invention can give full play to the synergistic effect between various substances and improve the levelness and color fastness of polyester dyeing to the greatest extent.

[0021] The preparation method of the quaternary ammonium salt modified linseed gum comprises the following steps:

[0022] S1. Add flaxseed gum to water to obtain a flaxseed gum solution;

[0023] S2, dissolving the quaternary ammonium salt in water to obtain a quaternary ammonium salt solution;

[0024] S3. Add the quaternary ammonium salt solution to the flaxseed gum solution, adjust the pH to 10-11, react at 60-70° C., filter, and adjust the pH to 5-7 to obtain the quaternary ammonium salt modified flaxseed gum.

[0025] The preparation method of the quaternary ammonium salt-modified linseed gum provided by the present invention is simple to operate, and realizes efficient, uniform and stable grafting of the quaternary ammonium salt onto the linseed gum molecular chain. The prepared quaternary ammonium salt-modified linseed gum has good stability and is applied as a leveling agent in the dyeing of black polyester to significantly improve the leveling property and color fastness of the polyester.

[0026] For example, in S1, flaxseed gum is added to water and stirred at 50-60°C to dissolve.

[0027] Preferably, in S1, the mass concentration of the flaxseed gum solution is 1-2%.

[0028] Preferably, in S2, the quaternary ammonium salt is 3-chloro-2-hydroxypropyltrimethylammonium chloride.

[0029] Preferably, the mass ratio of the flaxseed gum to the quaternary ammonium salt is 1:(1.2-1.5).

[0030] Preferably, in S2, the mass concentration of the quaternary ammonium salt solution is 30-40%.

[0031] Preferably, in S2, the reaction time is 4-5 h.

[0032] Illustratively, in S3, when the quaternary ammonium salt solution is added to the flaxseed gum solution, it needs to be added dropwise to the flaxseed gum solution.

[0033] Exemplarily, in S3, the reaction requires stirring at a rate of 200-300 rpm.

[0034] Exemplarily, the saponin is purchased from Shaanxi Sinuote Biotechnology Co., Ltd.

[0035] Preferably, the shrimp shell powder has a fineness of 0.8-1 μm.

[0036] The preferred particle size can prevent shrimp shell powder from agglomerating, enhance its uniform dispersion and penetration performance on the surface of polyester fibers, and thus significantly improve the levelness and color fastness of polyester fibers.

[0037] The present invention provides a method for preparing the black polyester dyeing liquid, comprising the following steps: uniformly mixing the weighed components of the black polyester dyeing liquid to obtain the black polyester dyeing liquid.

[0038] The preparation method of the black polyester dyeing liquid provided by the invention has a simple process and does not require complicated equipment. The prepared dyeing liquid can significantly improve the levelness and color fastness of polyester fibers and is suitable for industrialized rapid production. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Gleditsia saponins were purchased from Shaanxi Sinot Biotechnology Co., Ltd.; Disperse Yellow was Disperse Yellow C-4G from Zhejiang Jihua Group Co., Ltd.; Disperse Turquoise was Disperse Turquoise S-GL from Hangzhou Shenli Chemical Co., Ltd.; and Disperse Black was Artlon Black SW-VIP.

[0041] Example 1

[0042] The embodiment of the present invention provides a black polyester dyeing solution, comprising the following components in parts by weight: 18 parts of dye, 1.2 parts of neutralizer, 10 parts of leveling agent and 500 parts of water;

[0043] The dye comprises a mixture of disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black in a mass ratio of 7:1:1:25;

[0044] The neutralizing agent includes a mixture of acetic acid and boric acid in a mass ratio of 7:2;

[0045] The leveling agent comprises a mixture of soapberry saponin, quaternary ammonium salt modified flaxseed gum and shrimp shell powder with fineness ranging from 0.8 to 1 μm in a mass ratio of 3:1:1;

[0046] The preparation method of the quaternary ammonium salt modified flaxseed gum comprises the following steps:

[0047] S1, adding flaxseed gum into water at 50°C to obtain a flaxseed gum solution with a concentration of 1 wt%;

[0048] S2, dissolving 3-chloro-2-hydroxypropyl trimethyl ammonium chloride in water to obtain a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with a concentration of 30 wt%; the mass ratio of flaxseed gum to 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is 1:1.2;

[0049] S3, adding the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution dropwise into the flaxseed gum solution, adjusting the pH to 10, stirring at 70°C at a speed of 200 rpm for 4 h, filtering, and adjusting the pH to 7 to obtain the quaternary ammonium salt modified flaxseed gum.

[0050] Example 2

[0051] The black polyester dyeing solution provided by the embodiment of the present application comprises the following components in mass fractions: 20 parts of dye, 1 part of neutralizing agent, 13 parts of leveling agent, and 550 parts of water;

[0052] The dye comprises a mixture of disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black in a mass ratio of 10:1.5:2:28;

[0053] The neutralizing agent comprises a mixture of acetic acid and boric acid in a mass ratio of 8:3;

[0054] The leveling agent comprises a mixture of soapberry saponin, quaternary ammonium salt modified flaxseed gum and shrimp shell powder with fineness ranging from 0.8 to 1 μm in a mass ratio of 2:1.5:1.5;

[0055] The preparation method of the quaternary ammonium salt modified flaxseed gum comprises the following steps:

[0056] S1, adding flaxseed gum into water at 60°C to obtain a flaxseed gum solution with a concentration of 2 wt%;

[0057] S2, dissolving 3-chloro-2-hydroxypropyl trimethyl ammonium chloride in water to obtain a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with a concentration of 40 wt%; the mass ratio of flaxseed gum to 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is 1:1.5;

[0058] S3, the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution is added dropwise into the flaxseed gum solution, the pH is adjusted to 11, the reaction is stirred at 60℃ at a speed of 200 rpm for 5h, filtration is performed, the pH is adjusted to 5, and the quaternary ammonium salt modified flaxseed gum is obtained.

[0059] Example 3

[0060] The black polyester dyeing solution provided by the embodiment of the present application comprises the following components in the following mass fractions: 20 parts of dye, 1.2 parts of neutralizing agent, 13 parts of leveling agent, and 530 parts of water.

[0061] The dye comprises a mixture of dispersion yellow brown, dispersion yellow, dispersion turquoise blue, and dispersion black in a mass ratio of 8:2:2:30;

[0062] The neutralizing agent comprises a mixture of acetic acid and boric acid in a mass ratio of 8:2;

[0063] The leveling agent comprises a mixture of soapberry saponin, quaternary ammonium salt modified flaxseed gum, and shrimp shell powder with a fineness range of 0.8-1 μm in a mass ratio of 2:1:1.5;

[0064] The preparation method of the quaternary ammonium salt modified flaxseed gum comprises the following steps:

[0065] S1, at 60℃, flaxseed gum is added into water to obtain a flaxseed gum solution with a concentration of 2wt%;

[0066] S2, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is dissolved in water to obtain a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution with a concentration of 40wt%; the mass ratio of flaxseed gum to 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is 1:1.2;

[0067] S3, the 3-chloro-2-hydroxypropyl trimethyl ammonium chloride solution is added dropwise into the flaxseed gum solution, the pH is adjusted to 10, the reaction is stirred at 65℃ at a speed of 300 rpm for 5h, filtration is performed, the pH is adjusted to 5, and the quaternary ammonium salt modified flaxseed gum is obtained.

[0068] Comparative Example 1

[0069] The comparative example provides a black polyester dyeing solution, which is different from the embodiment 1 in that the soapberry saponin is replaced by an equal amount of sodium dodecyl benzene sulfonate; and the details are as follows:

[0070] The black polyester dyeing solution comprises the following components in the following mass fractions: 18 parts of dye, 1.2 parts of neutralizing agent, 10 parts of leveling agent, and 500 parts of water.

[0071] The dye comprises a mixture of dispersion yellow brown, dispersion yellow, dispersion turquoise blue, and dispersion black in a mass ratio of 7:1:1:25;

[0072] The neutralizing agent includes a mixture of acetic acid and boric acid in a mass ratio of 7:2;

[0073] The leveling agent includes a mixture of sodium dodecylbenzene sulfonate, quaternary ammonium salt-modified linseed gum, and shrimp shell powder with a fineness range of 0.8-1 μm in a mass ratio of 3:1:1;

[0074] The preparation method of quaternary ammonium salt modified flaxseed gum comprises the following steps:

[0075] S1. Add flaxseed gum to water at 50° C. to obtain a flaxseed gum solution with a concentration of 1 wt%;

[0076] S2. Dissolve 3-chloro-2-hydroxypropyltrimethylammonium chloride in water to obtain a 30 wt% 3-chloro-2-hydroxypropyltrimethylammonium chloride solution; the mass ratio of flaxseed gum to 3-chloro-2-hydroxypropyltrimethylammonium chloride is 1:1.2;

[0077] S3. Add 3-chloro-2-hydroxypropyltrimethylammonium chloride solution dropwise to the flaxseed gum solution, adjust the pH to 10, stir and react at 70° C. and 200 rpm for 4 h, filter, and adjust the pH to 7 to obtain quaternary ammonium salt-modified flaxseed gum.

[0078] Comparative Example 2

[0079] This comparative example provides a black polyester dyeing solution, which differs from Example 1 in that the quaternary ammonium salt-modified flaxseed gum is replaced with an equal amount of triethanolamine-modified flaxseed gum; the details are as follows:

[0080] The black polyester dyeing solution comprises the following components in parts by weight: 18 parts dye, 1.2 parts neutralizer, 10 parts leveling agent and 500 parts water;

[0081] The dye comprises a mixture of disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black in a mass ratio of 7:1:1:25;

[0082] The neutralizing agent includes a mixture of acetic acid and boric acid in a mass ratio of 7:2;

[0083] The leveling agent includes a mixture of saponin from gentiana, triethanolamine-modified linseed gum, and shrimp shell powder with a fineness range of 0.8-1 μm in a mass ratio of 3:1:1;

[0084] The preparation method of triethanolamine modified linseed gum comprises the following steps:

[0085] S1. Add flaxseed gum to water at 50° C. to obtain a flaxseed gum solution with a concentration of 1 wt%;

[0086] S2. Dissolve triethanolamine in water to obtain a 30 wt% triethanolamine solution; the mass ratio of flaxseed gum to triethanolamine is 1:1.2;

[0087] S3. Add the triethanolamine solution dropwise to the flaxseed gum solution, adjust the pH to 10, stir and react at 70° C. and 200 rpm for 4 h, filter, and adjust the pH to 7 to obtain triethanolamine-modified flaxseed gum.

[0088] Comparative Example 3

[0089] This comparative example provides a black polyester dyeing solution, which differs from Example 1 in that the shrimp shell powder is replaced with an equal amount of chitosan with a fineness range of 0.8-1 μm; the details are as follows:

[0090] The black polyester dyeing solution comprises the following components in parts by weight: 18 parts dye, 1.2 parts neutralizer, 10 parts leveling agent and 500 parts water;

[0091] The dye comprises a mixture of disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black in a mass ratio of 7:1:1:25;

[0092] The neutralizing agent includes a mixture of acetic acid and boric acid in a mass ratio of 7:2;

[0093] The leveling agent includes a mixture of saponin from gentiana, quaternary ammonium salt-modified linseed gum, and chitosan with a fineness range of 0.8-1 μm in a mass ratio of 3:1:1;

[0094] The preparation method of quaternary ammonium salt modified flaxseed gum comprises the following steps:

[0095] S1. Add flaxseed gum to water at 50° C. to obtain a flaxseed gum solution with a concentration of 1 wt%;

[0096] S2. Dissolve 3-chloro-2-hydroxypropyltrimethylammonium chloride in water to obtain a 30 wt% 3-chloro-2-hydroxypropyltrimethylammonium chloride solution; the mass ratio of flaxseed gum to 3-chloro-2-hydroxypropyltrimethylammonium chloride is 1:1.2;

[0097] S3. Add 3-chloro-2-hydroxypropyltrimethylammonium chloride solution dropwise to the flaxseed gum solution, adjust the pH to 10, stir and react at 70° C. and 200 rpm for 4 h, filter, and adjust the pH to 7 to obtain quaternary ammonium salt-modified flaxseed gum.

[0098] Comparative Example 4

[0099] This comparative example provides a black polyester dyeing solution, which differs from Example 1 in that boric acid is replaced with an equal amount of acetic acid; the details are as follows:

[0100] The black polyester dyeing solution comprises the following components in parts by weight: 18 parts dye, 1.2 parts acetic acid, 10 parts leveling agent and 500 parts water;

[0101] The dye comprises a mixture of disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black in a mass ratio of 7:1:1:25;

[0102] The leveling agent includes a mixture of saponin from gentiana, quaternary ammonium salt-modified linseed gum, and shrimp shell powder with a fineness range of 0.8-1 μm in a mass ratio of 3:1:1;

[0103] The preparation method of quaternary ammonium salt modified flaxseed gum comprises the following steps:

[0104] S1. Add flaxseed gum to water at 50° C. to obtain a flaxseed gum solution with a concentration of 1 wt%;

[0105] S2. Dissolve 3-chloro-2-hydroxypropyltrimethylammonium chloride in water to obtain a 30 wt% 3-chloro-2-hydroxypropyltrimethylammonium chloride solution; the mass ratio of flaxseed gum to 3-chloro-2-hydroxypropyltrimethylammonium chloride is 1:1.2;

[0106] S3. Add 3-chloro-2-hydroxypropyltrimethylammonium chloride solution dropwise to the flaxseed gum solution, adjust the pH to 10, stir and react at 70° C. and 200 rpm for 4 h, filter, and adjust the pH to 7 to obtain quaternary ammonium salt-modified flaxseed gum.

[0107] The polyester fiber was degreased by conventional means, and then the degreased polyester fiber was added to the black polyester dyeing solution provided in Examples 1-3 and Comparative Examples 1-4 of the present invention, and slowly stirred at a rate of 30 r / min using a stirrer. The dyeing temperature was set to 100° C. and the dyeing was continued for 2 hours. After dyeing, the polyester fiber was washed with water and then immersed in a formaldehyde-free fixing agent 2518 at a dosage of 2 g / L for fixing. The solution was immersed for 4 hours and then washed with water multiple times to obtain black polyester.

[0108] Levelness determination: Use X-Rite SP62 integrating sphere spectrophotometer to randomly select 10 points on the dyed sample, measure the L, a and b values ​​of each point, and then calculate ΔE avg The smaller the value, the better the color difference value. avg The specific calculation formula is as follows:

[0109]

[0110] ΔE avg =(ΔE1+ΔE 2+ ΔE3+……+ΔE i ) / 10;

[0111] Among them, L avg 、a avg and b avg is the average value of L, a and b of 10 points, Li 、a i and b i are the L, a, and b values ​​at different points, and i ranges from 1 to 10.

[0112] Color fastness determination: Color fastness to rubbing is tested according to GB / T3920-2008 “Textiles—Tests for color fastness—Color fastness to rubbing”.

[0113] The specific test results are shown in Table 1:

[0114] Table 1

[0115]

[0116]

[0117] As shown in Table 1, the dyeing solution provided by the embodiment of the present invention has excellent levelness and color fastness when dyeing polyester. The levelness is as low as 0.1, and the color fastness can reach level 5 under dry friction or wet friction conditions.

[0118] In Comparative Example 1, after replacing saponin with an equal amount of sodium dodecylbenzenesulfonate, sodium dodecylbenzenesulfonate produces strong electrostatic repulsion with quaternary ammonium salt-modified linseed gum, thereby causing uneven dye adsorption. Moreover, after replacing saponin, the ability of shrimp shell powder to assist the dye in penetrating into the interior of the polyester fiber becomes weaker, significantly reducing the levelness and color fastness.

[0119] In Comparative Example 2, after replacing the quaternary ammonium salt-modified flaxseed gum with an equal amount of triethanolamine-modified flaxseed gum, the dyeing effect could not be effectively slowed down, resulting in the problem of local over-dyeing. In addition, the synergistic effect of triethanolamine-modified flaxseed gum, saponins, and shrimp shell powder was significantly weakened, greatly reducing the color fastness.

[0120] In Comparative Example 3, after replacing shrimp shell powder with an equal amount of chitosan, the amino groups in chitosan have weak hydrogen bonding with the groups in the dye under the pH conditions of polyester dyeing, and the van der Waals force generated with the groups in the polyester fiber is also weakened, which cannot effectively assist the dye in penetrating into the internal pore structure of the polyester fiber, thereby reducing color fastness and levelness. In addition, chitosan will precipitate under weak acidic conditions, reducing levelness and color fastness.

[0121] In Comparative Example 4, after replacing boric acid with an equal amount of acetic acid, not only the levelness of dyeing was reduced, but also the color fastness was significantly reduced.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A black polyester dyeing solution, characterized in that: The invention comprises the following components in parts by weight: 18-20 parts of dye, 1-1.2 parts of neutralizer, 10-13 parts of leveling agent and 500-550 parts of water; Wherein, the neutralizing agent includes acetic acid and boric acid; The leveling agent comprises saponin, quaternary ammonium salt modified linseed gum and shrimp shell powder.

2. The black polyester dyeing solution according to claim 1, wherein The dyes include disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black.

3. The black polyester dyeing solution according to claim 2, wherein The mass ratio of the disperse yellow brown, disperse yellow, disperse turquoise blue and disperse black is (7-10):(1-2):(1-2):(25-30).

4. The black polyester dyeing solution according to claim 1, wherein The mass ratio of the acetic acid to the boric acid is (7-8):(2-3).

5. The black polyester dyeing solution according to claim 1, wherein The mass ratio of saponin, quaternary ammonium salt modified linseed gum and shrimp shell powder in the leveling agent is (2-3):(1-1.5):(1-1.5).

6. The black polyester dyeing solution according to claim 1, wherein The preparation method of the quaternary ammonium salt modified linseed gum comprises the following steps: S1. Add flaxseed gum to water to obtain a flaxseed gum solution; S2, dissolving the quaternary ammonium salt in water to obtain a quaternary ammonium salt solution; S3. Add the quaternary ammonium salt solution to the flaxseed gum solution, adjust the pH to 10-11, react at 60-70° C., filter, and adjust the pH to 5-7 to obtain the quaternary ammonium salt modified flaxseed gum.

7. The black polyester dyeing solution according to claim 6, wherein In S1, the mass concentration of the flaxseed gum solution is 1-2%; and / or In S2, the quaternary ammonium salt is 3-chloro-2-hydroxypropyltrimethylammonium chloride.

8. The black polyester dyeing solution according to claim 6, wherein The mass ratio of the flaxseed gum to the quaternary ammonium salt is 1:(1.2-1.5); and / or In S2, the mass concentration of the quaternary ammonium salt solution is 30-40%.

9. The black polyester dyeing solution according to claim 1, wherein The fineness of the shrimp shell powder is 0.8-1 μm.

10. A method for preparing the black polyester dyeing liquid according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: uniformly mixing the weighed components of the black polyester dyeing liquid to obtain the black polyester dyeing liquid.

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