A nylon rapid dyeing leveling agent, its preparation method and application

Abstract

The present invention discloses a nylon rapid dyeing leveling agent and its preparation method and application. The leveling agent comprises water and the following preparation raw materials by mass percentage: fatty amine polyoxyethylene ether 30% - 40%; succinic anhydride 2% - 10%; urea 0.4% - 1%; castor oil polyoxyethylene ether 5% - 10%; sodium hydroxide 1% - 3%; benzotriazole ultraviolet absorber 2% - 6%. The leveling agent has excellent dyeing performance, especially excellent in leveling property and migration property, and can achieve rapid dyeing at the same time, improving the dyeing efficiency. The present invention also provides the preparation method and application of the above leveling agent.

Description

Technical Field

[0001] The present invention relates to the technical field of dyeing auxiliaries, and particularly to a rapid dyeing leveling agent for nylon, its preparation method and application. Background Art

[0002] Polyamide, namely nylon fiber, has good wear resistance, relatively high strength and excellent elasticity. Nylon fiber fabrics are not only light but also have good wrinkle resistance, and are widely used in the textile field. However, due to the high crystallinity and relative hydrophobicity of the nylon fiber structure, the dyeing of nylon is difficult, and the requirements for dyeing technology are more stringent.

[0003] In the traditional nylon dyeing process, acid leveling agents are usually used in combination with acid releasing agents as a buffer system to stabilize the pH value in the dye bath and ensure the dye uptake rate and dyeing uniformity of nylon fibers. However, there are still many problems with existing leveling agents for nylon in practical applications: some leveling agents have a high dye-retarding property on fibers, resulting in an unsatisfactory dye uptake effect and light color; although some other leveling agents have good affinity for dyes and fibers, they need to control the dyeing process by slowly raising the temperature to ensure the dyeing uniformity and quality, which makes the dyeing time too long, the energy consumption high and the fabric surface quality unstable.

[0004] Therefore, there is an urgent need to develop a leveling agent that can not only achieve rapid dyeing but also ensure the dyeing effect. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a rapid dyeing leveling agent for nylon, which has excellent dyeing performance, especially excellent retarding and migration properties, and can achieve rapid dyeing, effectively improving the dyeing efficiency of nylon-containing fabrics.

[0006] The present invention also provides a preparation method of the above leveling agent.

[0007] The present invention also provides the application of the above leveling agent.

[0008] Specifically, the first aspect embodiment of the present invention relates to a leveling agent, comprising water and the following preparation raw materials by mass percentage:

[0009] Fatty amine polyoxyethylene ether 30%-40%;

[0010] Succinic anhydride 2%-10%;

[0011] Urea 0.4%-1%;

[0012] Castor oil polyoxyethylene ether 5%-10%;

[0013] Sodium hydroxide 1%-3%;

[0014] 2%-6% of benzotriazole ultraviolet absorber;

[0015] Among them, the fatty amine polyoxyethylene ether and succinic anhydride react to form an amide compound.

[0016] The leveling agent according to the embodiment of the first aspect of the present invention has at least the following beneficial effects:

[0017] The fatty amine polyoxyethylene ether can react with succinic anhydride to generate an amidation product (succinic anhydride has high reactivity and is prone to nucleophilic reaction with -NH2, and can react quickly and efficiently under milder conditions to generate an amidation product with fewer by-products), and further form sodium fatty amine polyoxyethylene ether succinate in the presence of alkali (the introduction of urea can effectively promote this reaction). This compound salt shows good affinity for fibers and can significantly improve the solubility of acid dyes. In the initial stage of dyeing during the heating process, it can effectively inhibit the dyeing rate of acid dyes, ensure the leveling effect during the dyeing process, and significantly improve the uniformity of dyeing.

[0018] Castor oil polyoxyethylene ether has good solubility and dispersion ability for dyes. During the rapid heating process of dyeing, it can ensure the success rate of dyeing of nylon fabrics in one time, not only guaranteeing the high efficiency and uniformity of dyeing, but also significantly reducing energy consumption and improving production efficiency while maintaining good dyeing effects.

[0019] The benzotriazole ultraviolet absorber can occupy the NH 3+ sites (the amino groups on nylon fibers are protonated to positively charged NH 3+ under acidic conditions, and these sites are prone to adsorb negatively charged acid dyes), further enhancing the leveling property, improving the dyeing effect, and enhancing the dyeing durability.

[0020] In summary, through the synergistic effect of each component, this formulation has successfully achieved a comprehensive improvement in the uniformity and efficiency of nylon dyeing.

[0021] According to some embodiments of the present invention, the average number of EO chain segments in the fatty amine polyoxyethylene ether molecule is 12-18, for example, specifically it can be 12, 13, 14, 15, 16, 17 or 18. Among them, the average number of EO chain segments represents the number of EO units in each molecule on average.

[0022] Controlling the number of EO chain segments in the fatty amine polyoxyethylene ether to have appropriate hydrophilicity and hydrophobicity, so as to have both good water solubility and adsorption to fibers, and improve the uniformity of dyeing. If the number of EO is too low, the lipophilicity will increase, resulting in a decrease in its water solubility and limited improvement in the dispersion and uniformity of dyes. On the contrary, if the number of EO is too high, the hydrophilicity increases, which may affect its adhesion to fibers.

[0023] The present invention does not make any restrictive provisions on the number of carbon atoms of the fatty amine in the fatty amine polyoxyethylene ether. For example, it can be 16-20.

[0024] According to some embodiments of the present invention, the average number of EO segments in the castor oil polyoxyethylene ether molecule is 20-60. For example, specifically, it can be 20, 25, 30, 35, 40, 45, 50, 55 or 60. Controlling the number of EO segments in the castor oil polyoxyethylene ether within the above range can achieve a better hydrophilic-lipophilic balance, improve the dissolution and dispersion of dyes, ensure good adhesion of dyes to fibers, achieve a stable and uniform dyeing effect, and improve the dyeing efficiency.

[0025] According to some embodiments of the present invention, the average number of EO segments in the castor oil polyoxyethylene ether molecule is 30-60. For example, it can be 30-40, or 40-60, etc.

[0026] According to some embodiments of the present invention, the mass percentage of the fatty amine polyoxyethylene ether is 30%-35%. Specifically, it can be about 30%, 31%, 32%, 33%, 34% or 35%. "About" means the value after conventional rounding.

[0027] According to some embodiments of the present invention, the mass percentage of the fatty amine polyoxyethylene ether is 30%-32%.

[0028] According to some embodiments of the present invention, the mass percentage of the succinic anhydride is 2%-5%. For example, it can be 3%-5%, or 2%-4%. More specifically, it can be about 2%, 3%, 4% or 5%.

[0029] According to some embodiments of the present invention, the mass percentage of the urea is 0.4%-0.8%. For example, specifically, it can be about 0.4%, 0.5%, 0.6%, 0.7% or 0.8%.

[0030] According to some embodiments of the present invention, the molar ratio of the fatty amine polyoxyethylene ether, succinic anhydride, and urea is 1:0.8-1.5:0.1-0.4. For example, it can be 1:0.8-1:0.1-0.4, or 1:0.8-1:0.1-0.3. More specifically, it can be about 1:0.8:0.1, 1:0.8:0.2, 1:0.8:0.3, 1:0.8:0.4, 1:0.9:0.1, 1:0.9:0.2, 1:0.9:0.3, 1:0.9:0.4, 1:1:0.1, 1:1:0.2, 1:1:0.3, 1:1:0.4, etc. Controlling the component ratio within the above range is conducive to achieving a full reaction under mild conditions, ensuring the reaction efficiency and product quality.

[0031] According to some embodiments of the present invention, the benzotriazole ultraviolet absorber is selected from hydroxy phenyl benzotriazole ultraviolet absorbers, such as the commercially available brand UV-1130, which has better compatibility than other benzotriazole ultraviolet absorbers and can achieve a more stable and uniform dispersion effect.

[0032] According to some embodiments of the present invention, the temperature of the reaction is 80 - 120 °C, and the reaction time is 1 - 4 h. This reaction process has the advantages of rapid reaction, mild conditions, and few side reactions. Specifically, the reaction temperature can be 80 °C, 85 °C, 90 °C, 95 °C, 100 °C, 105 °C, 110 °C, 115 °C or 120 °C, and the reaction time can be 1 h, 1.5 h, 2 h, 2.5 h, 3 h, 3.5 h or 4 h. The reaction conditions can be flexibly selected within the above-listed temperature and time ranges to meet the process requirements.

[0033] According to some embodiments of the present invention, the pH of the leveling agent is 6 - 8.

[0034] According to some embodiments of the present invention, the mass percentage of water in the leveling agent is ≥50%. The present invention does not limit the water content in the dye, and it can be selected according to actual needs and experience.

[0035] The second aspect of the embodiments of the present invention relates to a method for preparing the aforementioned leveling agent, including the following steps: in the presence of the urea, reacting the fatty amine polyoxyethylene ether and succinic anhydride to form an amide compound; mixing the amide compound with the remaining preparation raw materials.

[0036] This method is easy to operate and suitable for large-scale application.

[0037] According to some embodiments of the present invention, mixing the amide compound with the remaining preparation raw materials includes: mixing the amide compound with the preparation raw materials including water, castor oil polyoxyethylene ether, and benzotriazole ultraviolet absorber, and then adding sodium hydroxide for mixing.

[0038] This method is conducive to the uniform mixing of each component and improves its dispersibility and stability.

[0039] According to some embodiments of the present invention, the temperature of the reaction is 80 - 120 °C, and the reaction time is 1 - 4 h.

[0040] The third aspect of the embodiments of the present invention relates to the application of the aforementioned leveling agent in the dyeing of polyamide-containing fabrics.

[0041] Due to the amphoteric ion characteristics and good dye dissolution and dispersion properties of the leveling agent of the present invention, it is particularly suitable for use in the nylon dyeing process. Its unique properties can improve the adsorption uniformity of dyes, significantly enhance the dyeing uniformity and leveling effect, and increase the one-time success rate of dyeing, while effectively reducing energy consumption.

[0042] According to some embodiments of the present invention, the heating rate of the dyeing is 1.5 - 3 °C / min, specifically it can be 1.5 °C / min, 2.0 °C / min, 2.5 °C / min, and 3.0 °C / min. A gradient heating method can be adopted. For example, a relatively higher heating rate (such as 2.5 °C / min or 3.0 °C / min) can be selected in the initial stage, and a relatively lower heating rate (such as 1.5 °C / min or 2.0 °C / min) can be selected in the later stage to better balance efficiency and dyeing effect.

[0043] In order to ensure the dyeing effect, conventional leveling agents usually control the heating rate below 1 °C / min. Especially in the initial heating stage, the heating rate is usually significantly lower than 1 °C / min, for example, it is 0.6 - 0.7 °C / min. Therefore, under the premise of ensuring the dyeing effect, this solution significantly improves the dyeing efficiency and has higher production benefits compared to conventional leveling agents.

[0044] According to some embodiments of the present invention, the dyeing adopts a gradient heating method, including a first-stage heating and a second-stage heating. Among them, the temperature range of the first-stage heating is 40 - 60 °C, the temperature range of the second-stage heating is 60 °C - 100 °C, and the heating rate of the first stage > the heating rate of the second stage. For example, the heating rate of the first stage is 2.5 - 3 °C / min, and the heating rate of the second stage is 1.5 - 2 °C / min.

[0045] According to some embodiments of the present invention, the fabric containing nylon includes pure nylon fabric, nylon blended fabric, or nylon interwoven fabric. Among them, the nylon blended fabric includes nylon-polyester blend (nylon and polyester blend), nylon-cotton blend (nylon and cotton blend), nylon-wool blend (nylon and wool blend), nylon-spandex blend (nylon and spandex blend). For non-pure nylon fabrics, the content ratio of nylon is not specifically limited and can be selected according to industry experience. The present invention does not limit the fabric form and is applicable to fabric types such as knitting and weaving.

[0046] In this article, the numerical ranges involved all include the endpoint values and cover any sub-range within this range, such as the range obtained by any combination of the specifically listed numerical values. In addition, "above" or "below" both include the said numerical value itself.

[0047] "Room temperature" refers to 23 ± 2 °C.

[0048] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 The effects of the leveling agents of Inventive Example 1 and Comparative Example 3 in the dye dispersion test are shown.

[0050] Figure 2 The figure is a comparison of the temperature rise and fall curves of the dyeing process of the embodiment of the present invention and the conventional dyeing process during the cloth dyeing process.

[0051] Figure 3 The following is a comparison of the dyeing effects of the leveling agents of Example 1 of the present invention and Comparative Example 5.

[0052] Figure 4 These are the test results of the slow dyeing properties of the leveling agents of Example 1, Comparative Example 1, Comparative Example 2 and Comparative Example 5 on knitted fabrics of the present invention.

[0053] Figure 5 The slow dyeing test results of the leveling agents of Examples 1, 2, 3 of the present invention and Comparative Example 5 on knitted fabrics are shown.

[0054] Figure 6 The test results of the slow dyeing properties of the leveling agents of Examples 1, 2, 3 of the present invention and Comparative Example 5 on woven fabrics are shown.

[0055] Figure 7 The following are the test results of the slow dyeing properties of the leveling agents of Examples 1, 4, 5 of the present invention and Comparative Example 5 on knitted fabrics.

[0056] Figure 8 The slow dyeing test results of the leveling agents of Examples 1, 6, 7 of the present invention and Comparative Example 4 on knitted fabrics are shown.

[0057] Figure 9 The test results of dye migration of the leveling agent of Examples 1, 4, 5 of the present invention and Comparative Example 5 on knitted fabrics are shown. DETAILED DESCRIPTION

[0058] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0059] In the following examples, some of the raw materials are described as follows:

[0060] Benzotriazole ultraviolet absorber: UV-1130, purchased from Tianjin Lianlong.

[0061] Fatty amine polyoxyethylene ether: octadecylamine polyoxyethylene ether.

[0062] Unless otherwise specified, the raw materials or equipment involved are all commercially available conventional products.

[0063] Example 1

[0064] A leveling agent was prepared, and the mass percentages of the preparation raw materials were as follows: fatty amine polyoxyethylene ether, succinic anhydride, and urea (molar ratio 1:0.8:0.2) totaled 35%, sodium hydroxide 2%, castor oil polyoxyethylene ether 5%, benzotriazole ultraviolet absorber 4%, and deionized water 54%.

[0065] The preparation process of this leveling agent is as follows:

[0066] According to the ratio, put fatty amine polyoxyethylene ether and succinic anhydride into the reaction kettle, add urea as a catalyst, heat up to 105 °C, keep the temperature for reaction for 2 h, and synthesize fatty amine polyoxyethylene ether succinamide. Cool down to 60 °C, add castor oil polyoxyethylene ether, benzotriazole ultraviolet absorber and deionized water, stir for 30 - 40 min, and finally add sodium hydroxide to adjust the pH to 6.0 - 8.0.

[0067] Examples 2 - 7

[0068] A leveling agent was prepared, and the difference from Example 1 was only the different preparation raw materials used, as shown in Table 1 for details.

[0069] Comparative Examples 1 - 4

[0070] A leveling agent was prepared, and the difference from Example 1 was only the different preparation raw materials used, as shown in Table 1 for details.

[0071] Comparative Example 5

[0072] A commercially available conventional leveling agent, purchased from Tana Chemical, main components: fatty amine, sodium dodecylbenzenesulfonate.

[0073] Table 1

[0074]

[0075] In Table 1, "FAE" represents fatty amine polyoxyethylene ether (Fatty Amine Polyethylene Glycol Ether), and "COE" represents castor oil polyoxyethylene ether (Castor Oil Ethoxylate).

[0076] Test Example

[0077] The relevant dye formulations and test fabric types are shown in Table 2, and all the reactive dyes are purchased from Archroma.

[0078] Table 2

[0079]

[0080] 1. Dispersion of dyes

[0081] Prepare a red dye (0.6% o.w.f of red MB, 0.3 g / L of HAC), with the leveling agent dosage of 1% o.w.f, and perform suction filtration.

[0082] The color of the filter paper after suction filtration is as Figure 1 shown. Figure 1 The leveling agent of Example 1 is on the left, and the leveling agent of Comparative Example 3 is on the right. It can be seen that in Comparative Example 3, castor oil polyoxyethylene ether is not added, resulting in obvious dye aggregation and a significant increase in the suction filtration time, indicating that its leveling agent is difficult to effectively disperse dyes. It is difficult to ensure the dyeing uniformity after dye aggregation, so it is not usable industrially and no subsequent dyeing effect test is carried out. The dye performance of the remaining examples is the same as that of Example 1 and is not shown repeatedly.

[0083] 2. Fabric surface effect

[0084] Prepare gray and bright blue dyes according to the ratio in Table 2. Add a leveling agent (1% o.w.f) to the dyes. Taking Example 1 and Comparative Example 5 as examples, carry out dyeing according to the Figure 2 temperature rising and falling curve shown in a. The specific operation is as follows: Enter the dye bath at 40°C, heat up to 60°C at a heating rate of 3°C / min. When the temperature reaches 60°C, heat up to 98°C at a heating rate of 1.5°C / min, keep warm at 98°C for 30 min, add 0.3 g / L of glacial acetic acid during the heat preservation period. After the heat preservation ends, cool down to 60°C at a cooling rate of 1.5°C / min.

[0085] The effect after dyeing is as Figure 3 shown. It can be seen that for the leveling agent of Example 1, the fabric is evenly penetrated and dyed, the color is full, and there are no obvious shade and streak differences. While for the leveling agent of Comparative Example 5, under the fast dyeing process, there is a slight color mottling phenomenon on the fabric of the gray dye, and a moderate color mottling on the fabric of the bright blue dye. In order to achieve a comparable dyeing effect, Comparative Example 5 needs to adopt the Figure 2 conventional temperature rising and falling rate shown in b for dyeing (add 1% o.w.f of leveling agent and 0.5 g / L of acid releasing agent to the dye), and the specific operation is as follows: Enter the dye bath at 40°C, heat up to 60°C at a heating rate of 0.7°C / min, keep warm at 60°C for 10 min, then heat up to 70°C at a heating rate of 1°C / min, keep warm at 70°C for 10 min, then heat up to 98°C at a heating rate of 1°C / min, keep warm at 98°C for 30 min, and after the heat preservation ends, cool down to 60°C at a cooling rate of 1.5°C / min. Obviously, the leveling agent of the embodiment of the present invention has a higher dyeing efficiency.

[0086] It should be noted that the dyeing effect of the fabric sample can more accurately reflect the application effect of the actual process, and the subsequent leveling property test is based on the small sample. Although visually, the difference in the dyed surface of the small sample may not be obvious, the results of small-batch dyeing cannot reflect the difference in the dyeing effect in large-scale production.

[0087] 3. Leveling property

[0088] According to the dyeing and finishing technology regulations, after preparing the dye liquor, the dyeing operation is carried out synchronously. Starting from room temperature, it is heated from room temperature to 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 98°C at a heating rate of 3°C / min, and kept at 98°C for 30 min, and samples are taken at each stage. After the sample cloth is dried, using a Datacolor600 computer color measurement and matching device, with the wavelength set at 560 nm, the K / S value of each sample cloth is measured to analyze the change of the K / S value with time and temperature. If during the heating process and the extension of the dyeing time, the growth rate of the dye uptake rate is small, it indicates better leveling property.

[0089] The formula for calculating the dye uptake rate is as follows:

[0090] Dye uptake rate = [(K / S)2 / (K / S)1]*100%;

[0091] In the formula, (K / S)1 is the K / S value of the finally dyed cloth, and (K / S)2 is the K / S value of the colored cloth at each temperature stage during the heating process from 40 to 98°C.

[0092] The leveling properties of Examples 1-7, Comparative Example 1, Comparative Example 2, Comparative Example 4, and Comparative Example 5 of the present invention are as Figures 4 - 8 shown, where unless otherwise specified, the fabric types used are all 30D nylon + 30D spandex knitted double-sided cloth in Table 2.

[0093] The results show that the leveling agent in Example 1 exhibits the best leveling property. In Comparative Example 1 and Comparative Example 2, the average number of EO segments of fatty amine polyoxyethylene ether is increased to 20 and 30. In addition, when the molar ratio of fatty amine polyoxyethylene ether, succinic anhydride, and urea is the same as that in Example 1, its urea content is too low, and the decolorization after dyeing is too large (manifested as a small K / S value), affecting the dyeing quality. In Examples 2 and 3, by adjusting the ratio of fatty amine polyoxyethylene ether, succinic anhydride, and urea, although the leveling property is not as good as that in Example 1, it is significantly better than that in Comparative Example 5, and the same performance trend is shown on nylon woven and knitted fabrics. In Examples 4 and 5, the average number of EO segments of castor oil polyoxyethylene ether is 20 and 60 respectively. Although its leveling property is not as good as that in Example 1, it is still significantly better than that in Comparative Example 5. In Examples 6 and 7, the addition amounts of benzotriazole ultraviolet absorbers are 2% and 6% respectively. Its leveling property is significantly better than the formulation without benzotriazole (Comparative Example 4), and is significantly better than that in Comparative Example 5.

[0094] The above results show that, based on the reasonable combination of each component, the leveling agent of the present invention significantly improves the retarding property during rapid dyeing, makes the dyeing process more stable and uniform, can reduce color difference, and is more suitable for industrial dyeing processes.

[0095] 4. Migration property

[0096] Splice a dyed cloth sample (original cloth) without adding a leveling agent with a white cloth (migration cloth) of the same material and equal amount, and add a leveling agent (1% o.w.f or 1.5% o.w.f). The initial dyeing temperature is 30°C, and the temperature is raised at a rate of 3°C / min and held at 98°C for 30 min. After the sample cloth is washed and dried, the K / S values of the original cloth and the migration cloth are measured respectively. The transfer dyeing rate (migration rate) is calculated according to the following formula. The higher the migration rate, the better the migration property:

[0097] =[(K / S)2' / (K / S)1']*100%;

[0098] In the formula, (K / S)1' is the K / S value of the original cloth after migration; (K / S)2' is the K / S value of the migration cloth after migration.

[0099] Figure 9 Shows the migration property test results of Example 1, Example 4, Example 5 and Comparative Example 5 under different leveling agent dosages. The results show that the migration property of Example 1 is the best. In Example 4, the average number of EO segments of castor oil polyoxyethylene ether is 20. Although the migration property is not as good as that of Example 1, it is significantly better than that of Comparative Example 5; in Example 5, the average number of EO segments of castor oil polyoxyethylene ether is 60, and the migration property shows the best performance.

[0100] Therefore, the overall migration property of the leveling agent in the examples is significantly improved, enabling the dye to be more evenly redistributed during the dyeing process, thus significantly improving the dyeing uniformity, enhancing the correction ability of the dyeing process, improving the quality of the dyed products, and better meeting the industrial batch dyeing requirements of nylon-containing fabrics.

[0101] In summary, the leveling agent in the examples has excellent retarding and migration properties, can better meet the dyeing requirements of nylon-containing fabrics, can improve the success rate of one-time dyeing, improve the dyeing efficiency, reduce energy consumption, and is suitable for industrial batch applications.

[0102] The above has described the embodiments of the present invention in detail, but the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which it pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A leveling agent, characterized in that: It includes water and the following preparation raw materials by mass percentage: Fatty amine polyoxyethylene ether: 30%-40%; Succinic anhydride: 2%-10%; Urea: 0.4%-1%; Castor oil polyoxyethylene ether: 5%-10%; Sodium hydroxide: 1%-3%; Benzotriazole ultraviolet absorber: 2%-6%; Among them, the fatty amine polyoxyethylene ether and succinic anhydride react to form an amide compound, and the average number of EO segments in the fatty amine polyoxyethylene ether molecule is 12-18.

2. The leveling agent according to claim 1, characterized in that: The average number of EO segments in the castor oil polyoxyethylene ether molecule is 20-60.

3. The leveling agent according to claim 1, wherein: The molar ratio of the fatty amine polyoxyethylene ether, succinic anhydride, and urea is 1.0:0.8-1.5:0.1-0.

4.

4. The leveling agent according to claim 1, characterized in that: The benzotriazole ultraviolet absorber is selected from hydroxy phenyl benzotriazole ultraviolet absorbers.

5. The leveling agent according to claim 4, characterized in that: The benzotriazole ultraviolet absorber is selected from UV-1130.

6. The leveling agent according to claim 1, characterized in that: The temperature of the reaction is 80-120°C, and the reaction time is 1-4 h.

7. The leveling agent according to claim 1, characterized in that: The pH of the leveling agent is 6-8; and / or, the mass percentage of water in the leveling agent is ≥50%.

8. The preparation method of the leveling agent according to any one of claims 1-7, characterized in that: It includes the following steps: In the presence of the urea, react the fatty amine polyoxyethylene ether and succinic anhydride to form an amide compound; mix the amide compound with the remaining preparation raw materials.

9. The application of the leveling agent according to any one of claims 1-7 in the dyeing of nylon-containing fabrics.

10. The application according to claim 9, wherein The heating rate of the dyeing is 1.5-3°C / min.

11. The application according to claim 10, characterized in that, The heating process of the dyeing is gradient heating, including the first-stage heating and the second-stage heating. The temperature range of the first-stage heating is 20-60°C, and the temperature range of the second-stage heating is 60°C-100°C, and the heating rate of the first stage > the heating rate of the second stage.

12. The application according to claim 9, wherein The nylon-containing fabric includes pure nylon fabric, nylon blended fabric, or nylon interwoven fabric.

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