Special leveling agent for terylene and blended fabric thereof as well as preparation method and application of special leveling agent

Abstract

The invention provides a special leveling agent for terylene and blended fabric thereof as well as a preparation method and application of the special leveling agent. The special leveling agent disclosed by the invention is prepared from the following components in percentage by weight: 13 to 26 percent of C12-15 alkyl alcohol polyoxyethylene ether, 12 to 22 percent of modified polyether ester, 4 to 10 percent of phenolic ether sulfate, 17 to 32 percent of salt-tolerant comb-type ampholytic surfactant and 12 to 45 percent of water, wherein the total weight is 100 percent. The special leveling agent for the terylene and the blended fabric thereof is excellent in retarding and migration performance, strong in binding force with dye, good in dispersity, uniform in dyeing and free of dyeing defects; the decoloration is small, and the final coloring of the fabric is not influenced; the emulsion removal effect on mixed oil is good, oil removal is thorough, and oil spots and dyeing defects are not prone to being generated; and the oil-removing and dyeing one-bath agent can be used for an oil-removing and dyeing one-bath process of the polyester-spandex blended fabric under the condition of reuse water, so that the production efficiency is improved, and the carbon emission is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a high-temperature characteristic leveling agent for polyester and its blended fabric in the field of textile printing and dyeing technology, in particular to a characteristic leveling agent for oil removal and dyeing of polyester and its blended fabric in a one-bath process under reused water conditions, and a preparation method and application thereof. BACKGROUND

[0002] Polyester fabric has become the largest and most widely used synthetic fiber in the world due to its stable chemical properties, wear resistance, corrosion resistance, high elasticity, quick drying and easy care after washing, and strong recyclability, and is widely used in clothing, home textiles, and industrial fields. During spinning and weaving, spinning oil is added to reduce the friction between the polyester fiber and the machine and improve the spinning efficiency. These oils need to be removed during dyeing and finishing, otherwise they will cause agglomeration of disperse dyes, color stains, and oil stains, affecting the dyeing quality.

[0003] Traditional polyester fabric dyeing and finishing is first to add an oil removal agent to emulsify and remove the spinning oil under alkaline conditions, and then to dye. This is a step-by-step process, complete oil removal, and oil stains are not easy to occur. Dyeing process with leveling agent, dye is not easy to agglomerate, not easy to form color spots, color spots, oil stains and other defects. However, with the increasing demand for polyester and lower processing costs, the water and energy consumption of step-by-step processing is too high. In order to save costs and reduce emissions, more and more dyeing and finishing plants use oil removal and dyeing in a one-bath process to process polyester fabric.

[0004] With the deepening of the concept of carbon reduction, green environmental protection, more and more dyeing and finishing plants use reused water for oil removal and dyeing in a one-bath process, which will also be an inevitable trend. Although most impurities and chemicals are removed from the reused water, there are still problems such as high conductivity, color, and turbidity. The presence of electrolytes greatly reduces the oil removal and oil stain removal ability of the oil removal agent and the ability of the leveling agent to disperse and transfer the dye, often causing dyeing defects such as color stains and oil stains, which must be repaired and re-dyed, reducing production efficiency.

[0005] Due to the high elasticity and strong recovery rate of spandex, with people's pursuit of comfort and sporty style, more and more polyester-spandex blended fabrics are being produced, and the spandex blended ratio has increased from 2-3% to 10-20% by mass percentage. For fabrics with more than 5% spandex content, the polydimethylsiloxane added during spandex spinning makes it difficult for general oil removal agents to completely emulsify and remove it, further increasing the difficulty of oil removal and dyeing in a one-bath process.

[0006] Patent CN117535991A discloses a scouring and dyeing one-bath treatment agent for chemical fibers, which has excellent emulsification oil removal performance, good slow dyeing and migration effect in the dyeing process, and realizes one-bath treatment of polyester fabric oil removal and dyeing, but its salt resistance is poor and cannot be used in reused water conditions. Patent CN115012235B discloses a salt-resistant low-foaming dispersion leveling agent, which realizes high-temperature dyeing under reused water conditions by the hydrophilic effect of the polyether chain in the double ester compound formed by CP12L and CP9 softening water, C16-18 fatty alcohol polyoxyethylene ether and cyclohexane-1,2-dicarboxylic acid esterification, but only as a salt-resistant leveling agent, the emulsification ability is poor, and it does not have oil removal function, and cannot realize one-bath of oil removal and dyeing. The inventors verified the compounding experiment of patent CN117535991A and CN115012235B, because the treatment agent in CN117535991A is not salt-resistant, the compounding formula has poor emulsification and oil removal of oil agent under reused water conditions, the oil agent is easy to agglomerate, in addition, excessive dispersant leads to poor dyeing of dyes, light color, and cannot realize one-bath of oil removal and dyeing under reused water conditions. SUMMARY

[0007] The purpose of the present application is to provide a characteristic leveling agent for one-bath process of oil removal and dyeing of polyester and its blended fabric under reused water conditions, and a preparation method and application thereof.

[0008] In view of the above-mentioned related technical problems, the present application uses C12-15 alkyl alcohol polyoxyethylene ether emulsifier for oil agent of polyester and ammonia blended fabric, modified polyether ester, phenolic ether sulfate and salt-resistant comb-shaped amphoteric surfactant for slow dyeing and dispersion of disperse dyes, which are compounded, not only realizing one-bath process of oil removal and dyeing of polyester and its blended fabric, especially polyester and ammonia fabric, but also having excellent salt resistance, small decrease in emulsification ability of oil agent and dispersion ability of dyes under reused water conditions, no dyeing defects such as color stains and oil spots on the surface of dyed fabric, greatly shortening the processing flow, saving energy and reducing consumption, and improving production efficiency.

[0009] One aspect of the present application provides a characteristic leveling agent for polyester and its blended fabric, which comprises the following components, based on 100% by weight of the total weight of the characteristic leveling agent:

[0010] C12-15 alkyl alcohol polyoxyethylene ether: 13-26% by weight,

[0011] Modified polyether ester: 12-22% by weight,

[0012] Phenolic ether sulfate: 4-10% by weight,

[0013] Salt-resistant comb-shaped amphoteric surfactant: 17-32% by weight, and

[0014] Water: 12-45% by weight.

[0015] Further, the C12-15 alkyl alcohol polyoxyethylene ether is a linear fatty alcohol polyoxyethylene ether or an isomeric alcohol polyoxyethylene ether, and the number of oxyethylene ether structural units (EO) is 3-10, and more specifically, can be one or more of AO3, AO5, AO8 of BASF, TA60, TA80 of SACHEM, and the like.

[0016] Further, the modified polyether ester is a cardanol-modified polyether oleate.

[0017] Further, the phenolic ether sulfate is a cardanol polyether sulfate.

[0018] Further, the salt-tolerant comb-type amphoteric surfactant has the following structure:

[0019]

[0020] wherein n = 16-30, and a:b:c = 1.8-2.2:1:4.8-5.4.

[0021] Further, the salt-tolerant comb-type amphoteric surfactant is copolymerized from tetradecene, allyl polyether APEG, and sulfobetaine methacrylate SBMA (3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt).

[0022] Further, the salt-tolerant comb-type amphoteric surfactant has a weight average molecular weight of 80000-120000.

[0023] Further, the method for preparing the salt-tolerant comb-type amphoteric surfactant comprises the following steps:

[0024] (1) mixing allyl polyether APEG, sulfobetaine methacrylate SBMA, tetradecene, water, and Span-80 to form an emulsion;

[0025] (2) warming to 68-72°C, adding an initiator dropwise, maintaining 68-72°C for 4h, and then warming to 75°C for 1h to obtain the salt-tolerant comb-type amphoteric surfactant.

[0026] Further, the method for preparing the salt-tolerant comb-type amphoteric surfactant comprises the following steps:

[0027] (1) Add allyl polyether APEG, sulfobetaine methacrylate SBMA and 200 mL of water to a 500 mL four-necked flask equipped with a stirrer, thermometer, reflux condenser and constant pressure titration funnel. Place the flask in a constant temperature water bath, turn on the stirrer and adjust the speed to 150-300 rpm / min, and purge with nitrogen to remove oxygen. Then, heat the constant temperature water bath to 45°C and slowly add the pre-prepared uniform mixture of tetradecene and Span-80 to the four-necked flask. Continue stirring until a stable milky white semi-transparent emulsion is formed.

[0028] (2) Adjust the temperature of the constant temperature water bath to 68-72℃, and add 0.8-1.0% (relative to the total weight of the monomer) of azobisisobutyronitrile (AIBN) initiator (prepared as a 10% wt% ethanol solution), controlling the dropping rate to about 0.7-0.9 mL / min. After the initiator is added, maintain the reaction at 68-72℃ for 4 hours. Then raise the temperature to 75℃ and react for 1 hour, cool to below 40℃, and remove the ethanol by vacuum distillation to obtain a pale yellow, viscous, salt-resistant comb-type amphoteric surfactant.

[0029] Another aspect of the present invention provides a method for preparing the above-mentioned special leveling agent for polyester and its blended fabrics, comprising the following steps:

[0030] (1) Add C12-15 alkyl alcohol polyoxyethylene ether, modified polyether ester, phenolic ether sulfate, salt-resistant comb-type amphoteric surfactant and water, heat to 50-70℃ and stir for 30-50 minutes;

[0031] (2) Cool to room temperature to obtain a special leveling agent.

[0032] Another aspect of the present invention provides the application of the above-mentioned polyester and blended fabric characteristic leveling agent in the degreasing and dyeing process of polyester-ammonia blended fabrics under recycled water conditions.

[0033] Compared with the prior art, the originality of the special leveling agent of the present invention is reflected in the following aspects: (1) The salt-resistant comb-type amphoteric surfactant has both emulsifying and dispersing properties, has a certain affinity for dyes, and has strong binding force with dyes. In addition, the dispersing performance is outstanding, and it is not easy to produce color spots or color patterns, resulting in more uniform dyeing; (2) The raw materials used have excellent salt resistance and can maintain outstanding emulsifying and dispersing properties even under recycled water conditions; (3) The nonionic surfactant and salt-resistant comb-type amphoteric surfactant used have strong emulsifying and dispersing ability for mixed oil agents of polyester-ammonia blended fabrics, and can take into account both degreasing and leveling functions.

[0034] The special leveling agent for polyester and its blended fabrics of the present invention still has excellent oil emulsification and dye dispersion capabilities under conditions where the conductivity is higher than 3000 μs / cm, such as 5000 μs / cm. The salt-resistant comb-type amphoteric surfactant has good dispersion of disperse dyes. The synergistic effect of the components of this special leveling agent has a good effect on the emulsification and removal of mixed oils in polyester-ammonia blended fabrics under recycled water conditions. It has excellent slow dyeing and migration dyeing performance, and has little decolorization, does not affect the final color, and is not prone to color spots or oil spots. It can shorten the processing flow, improve production efficiency, save energy and reduce carbon emissions. Attached Figure Description

[0035] Figure 1 These photos show the effect of a special leveling agent on oil removal and dyeing in a single bath under recycled water conditions. Detailed Implementation

[0036] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the invention. It should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0037] Unless otherwise specified, "%" refers to "weight %".

[0038] Example 1

[0039] Synthesis of salt-tolerant comb-type amphoteric surfactant 1:

[0040] (1) Add 60g (approximately 0.05mol) of allyl polyether APEG (molecular weight 1200), 69.8g (approximately 0.25mol) of sulfobetaine methacrylate SBMA, and 200mL of water to a 500mL four-necked flask equipped with a stirrer, thermometer, reflux condenser, and constant pressure titration funnel. Place the flask in a constant temperature water bath, turn on the stirrer, adjust the speed to 250rpm / min, and purge with nitrogen to remove oxygen. After purging with nitrogen for 20min, raise the temperature of the constant temperature water bath to 45℃, and slowly add the pre-prepared homogeneous mixture of 17.7g (approximately 0.09mol) tetradecene and 1.5g Span-80 to the four-necked flask. Continue stirring for 30min until a stable milky white semi-transparent emulsion is formed.

[0041] (2) Adjust the temperature of the constant temperature water bath to 68℃, and add 12mL of 10% AIBN ethanol solution (the amount of AIBN is equivalent to 0.8% of the total weight of the monomer) as an initiator, controlling the dropping rate to about 0.8mL / min. After the initiator is added, maintain the reaction at 68℃ for 4h. Then raise the temperature to 75℃ and react for 1h, cool to below 40℃, and remove the ethanol by vacuum distillation to obtain a pale yellow viscous salt-resistant comb-type amphoteric surfactant 1, with a weight-average molecular weight of 120,000 and a solid content of about 42.8%.

[0042] Preparation of Specialty Leveling Agent 1: 5g AO3, 11g AO8 (both purchased from BASF), 21g cashew phenol polyether oleate NSG2203, 8g cashew phenol polyether sulfate NSN3522 (both purchased from Changshu Naisu Biotechnology), 17g salt-resistant comb-type amphoteric surfactant 1 (weight average molecular weight of 120,000) and 38g water were added to a reaction vessel and stirred at 50℃ for 30min until all components were mixed evenly. After cooling to room temperature, Specialty Leveling Agent 1 was obtained, with a solid content of 50.4%.

[0043] Example 2

[0044] Synthesis of salt-tolerant comb-type amphoteric surfactant 2:

[0045] (1) Add 50g (approximately 0.05mol) of allyl polyether APEG (molecular weight 1000), 67g (approximately 0.24mol) of sulfobetaine methacrylate SBMA, and 200mL of water to a 500mL four-necked flask equipped with a stirrer, thermometer, reflux condenser, and constant pressure titration funnel. Place the flask in a constant temperature water bath, turn on the stirrer, adjust the speed to 250rpm / min, and purge with nitrogen to remove oxygen. After purging with nitrogen for 20min, raise the temperature of the constant temperature water bath to 45℃, and slowly add the pre-prepared homogeneous mixture of 19.6g (approximately 0.10mol) tetradecene and 1.5g Span-80 to the four-necked flask. Continue stirring for 30min until a stable milky white semi-transparent emulsion is formed.

[0046] (2) Adjust the temperature of the constant temperature water bath to 70℃, and add 14mL of 10% AIBN ethanol solution (the amount of AIBN is equivalent to 1.0% of the total weight of the monomer) as an initiator, controlling the dropping rate to about 0.8mL / min. After the initiator is added, maintain the reaction at 70℃ for 4h. Then raise the temperature to 75℃ and react for 1h, cool to below 40℃, and remove the ethanol by vacuum distillation to obtain a pale yellow viscous salt-resistant comb-type amphoteric surfactant 2, with a weight-average molecular weight of 100,000 and a solid content of about 41.0%.

[0047] Preparation of Specialty Leveling Agent 2: 8g TA60 (purchased from Sasol Chemicals), 15g AO5 (purchased from BASF), 13g cashew phenol modified polyether oleate NSG2202B, 5g cashew phenol polyether sulfate NSN3007C (all purchased from Changshu Naisu Biotechnology), 25g salt-resistant comb-type amphoteric surfactant 2 (weight average molecular weight of 100,000) and 34g water were added to a reaction vessel and stirred at 70℃ for 40min until all components were mixed evenly. After cooling to room temperature, specialty leveling agent 2 was obtained, and the solid content was measured to be 51.2%.

[0048] Example 3

[0049] Synthesis of salt-tolerant comb-type amphoteric surfactant 3:

[0050] (1) Add 45g (approximately 0.05mol) of allyl polyether APEG (molecular weight 900), 72.6g (approximately 0.26mol) of sulfobetaine methacrylate SBMA and 200mL of water to a 500mL four-necked flask equipped with a stirrer, thermometer, reflux condenser and constant pressure titration funnel. Place the flask in a constant temperature water bath, turn on the stirrer, adjust the speed to 250rpm / min, and purge with nitrogen to remove oxygen. After purging with nitrogen for 20min, raise the temperature of the constant temperature water bath to 45℃, and slowly add the pre-prepared homogeneous mixture of 21.6g (approximately 0.11mol) tetradecene and 1.5g Span-80 to the four-necked flask. Continue stirring for 30min until a stable milky white semi-transparent emulsion is formed.

[0051] (2) Adjust the temperature of the constant temperature water bath to 68℃, and add 14 mL of 10% AIBN ethanol solution (the amount of AIBN is equivalent to 1.0% of the total weight of the monomer) as initiator, controlling the dropping rate to about 0.8 mL / min. After the initiator is added, maintain the reaction at 68℃ for 4 h. Then raise the temperature to 75℃ and react for 1 h, cool to below 40℃, and remove the ethanol by vacuum distillation to obtain a pale yellow viscous salt-resistant comb-type amphoteric surfactant 3, with a weight-average molecular weight of 80,000 and a solid content of about 41.5%.

[0052] Preparation of Special Leveling Agent 3: 20g TA80 (purchased from Sasol Chemicals), 19g cashew phenol modified polyether oleate NSG2201, 9g cashew phenol polyether sulfate NSF1815S (all purchased from Changshu Naisu Biotechnology), 30g salt-resistant comb-type amphoteric surfactant 3 (weight average molecular weight of 80,000) and 22g water were added to a reaction vessel and stirred at 60℃ for 45min until all components were mixed evenly. After cooling to room temperature, Special Leveling Agent 3 was obtained, and the solid content was measured to be 54.8%.

[0053] The effectiveness of the special leveling agent for polyester and its blended fabrics of the present invention was verified by the following experiments.

[0054] 1. Experiment Content

[0055] 1.1 Textiles: Commercially available polyester-spandex knitted fabric (85% polyester, 15% spandex)

[0056] 1.2 Dyes and Chemicals: Degreasing and leveling agent T (commercially available, yellow transparent liquid, solid content 68.3%), degreasing and leveling agent D (commercially available, yellow turbid liquid, solid content 59.6%), the special leveling agent of the above embodiments, soda ash, sodium hydrosulfite, and acetic acid were all purchased from Sinopharm Group. Disperse Blue HGL, Disperse Yellow Brown SWD, Atlon Yellow AQE, Atlon Red AQE, and Atlon Blue AQE were all purchased from Shanghai Yayun Textile Chemical Co., Ltd.

[0057] 1.3 Application Process:

[0058] Mixed oil: Heavy machine oil: White oil: Dimethicone oil = 5:3:2 (by weight)

[0059] Oil-stained cloth: Add 0.1g of the above mixed oil agent to the polyester-spandex knitted fabric, dry at 80℃, and set at 150℃ for 30s for later use.

[0060] Water quality: The indicators of the factory's recycled water are shown in Table 1. All performance and effects described below were tested using recycled water.

[0061] 1.3.1 Oil emulsification process:

[0062] Prepare the working solution (1 g / L leveling agent, 8 g / L of the above mixed oil, adjust the pH of the working solution to 5.0 with acetic acid) → heat to 130℃ for 30 min → cool to 80℃ and remove the working solution → visually evaluate.

[0063] 1.3.2 Degreasing and dyeing in the same bath process:

[0064] Prepare the working solution (1 g / L leveling agent, x% owf dye, acetic acid to adjust the pH of the working solution to 5.0, liquor ratio 1:20) → heat from 40℃ to 80℃ (heating rate 2℃ / min) → continue heating to 130℃ (heating rate 0.8℃ / min) and hold for 40 min → cool to 80℃ and drain the solution → reduction cleaning (2 g / L sodium hydrosulfite, 3 g / L sodium carbonate) at 80℃ for 15 min → thoroughly wash with water and dry → observe the oil removal and dyeing uniformity of the fabric surface.

[0065] 2 Performance Testing

[0066] 2.1 Testing of oil emulsification properties

[0067] The emulsifying and dispersing performance of the leveling agent on the oil agent under recycled water conditions was evaluated using process 1.3.1. The closer the poured working solution is to an emulsion, the less oil precipitates on the surface of the working solution and the less oil adheres to the cup wall, indicating a stronger emulsifying and dispersing ability of the leveling agent. Grade 1 is the worst, and Grade 5 is the best. The results are shown in Table 2.

[0068] 2.2 Test on the oil removal effect of the simultaneous oil removal and dyeing process

[0069] According to section 1.3.2, the performance of leveling agents in removing oil stains is evaluated based on the dyeing process for sensitive light gray. The lighter the oil stain and the more uniform the color on the fabric, the better the oil removal effect of the leveling agent. Grade 1 is the worst, and Grade 5 is the best.

[0070] The dosage of light gray dyes is as follows: Atlon Yellow AQE 0.12% owf, Atlon Red AQE 0.16% owf, and Atlon Blue AQE 0.18% owf.

[0071] 2.3 Slow staining

[0072] The process 1.3.2 was adopted, and the dye formulation was disperse yellow brown SWD 0.19% owf, disperse red AQE 0.30% owf, and disperse blue HGL 0.30% owf. Samples were taken at 90℃, 110℃, 130℃, and 130℃ for 40 min, respectively. After rinsing with tap water for 30 s, the samples were dehydrated and dried. The K / S value of each sampling point was measured using a Datacolor colorimeter. The lower the K / S value in the initial stage of dyeing, the better the retarding performance of the leveling agent.

[0073] 2.4 Transmissibility

[0074] The fabric dyed according to the dye formulation in 2.3 is used as the dyeing sample for the transfer dyeing combination. It is sewn with white fabric of the same specification and treated in accordance with the standard HG / T 4263-2011 "Determination of the transfer dyeing performance of leveling agents for polyester textile dyeing and finishing auxiliaries". The more the transfer rate increases after adding leveling agent, the better the transfer dyeing performance of leveling agent.

[0075] 2.5 Decolorization

[0076] Using process 1.3.2, with a dye formulation of Disperse Blue HGL 0.05% owf, the fabric was dyed. The color strength of the blank sample (without leveling agent) was set as 100. A Datacolor colorimeter was used to test the color strength of fabrics dyed with different leveling agents. The closer the strength is to 100, the less the leveling agent diminishes the color gain of the dye.

[0077] 2.6 Effect on dye dispersibility

[0078] The working solution was prepared according to process 1.3.2 of HG / T 4261-2011 "Determination of High-Temperature Dispersibility of Leveling Agents for Textile Dyeing and Finishing Auxiliaries for Polyester". The dye formulation was Disperse Blue HGL 1.0 g / L. Grade 5 - No dye particle aggregation; Grade 4 - Slight dye particle aggregation; Grade 3 - Dye particle aggregation present; Grade 2 - Dye particle aggregation relatively obvious; Grade 1 - Dye particle aggregation extremely obvious.

[0079] The performance and application effects of each embodiment are compared with those of commercially available oil-removing and leveling agents T and D, as shown in Tables 2 and 3 below. Furthermore, Figure 1 The effect of the same bath process for degreasing and dyeing under recycled water conditions on oil stain removal when dyeing sensitive light gray is shown.

[0080] Table 1 Water Quality Indicators

[0081]

[0082] As shown in Table 1, the factory's recycled water has higher conductivity, hardness, and color than normal water and contains Fe. 3+ High electrical conductivity and hardness can affect the performance of additives to varying degrees, leading to decreased processing effectiveness and product quality problems. 3+ The presence of [something] can affect the color of the dye and increase the color difference in dyeing.

[0083] Table 2 Comparison of oil removal and dyeing properties of leveling agents

[0084]

[0085] As shown in Table 2, the unique leveling agent of this invention exhibits excellent emulsifying and mixing performance with oil-based agents under factory recycled water conditions, resulting in a stable emulsion that is not prone to demulsification or re-adhesion. Furthermore, for dyeing sensitive colors such as light gray using a degreasing and dyeing process in a single bath under recycled water conditions, according to… Figure 1 It is evident that, compared to commercially available degreasing and leveling agents T and D, the unique leveling agent of this invention has a better degreasing effect. Table 2 shows the data on dye dispersion, migration, and decolorization performance, demonstrating that, compared to commercially available degreasing and leveling agents T and D, the unique leveling agent of this invention is more effective at leveling dyes, resulting in more uniform dyeing, better dye dispersion, less dye aggregation to form lakes, less decolorization, and less impact on the final color.

[0086] Table 3 Comparison of the retarding properties of leveling agents

[0087]

[0088] As shown in Table 3, compared with commercially available oil-removing leveling agents T and D, the unique leveling agent of this invention produces a lighter color in the initial dyeing stage. This indicates that the leveling agent and dye are combined and dispersed in the water bath, effectively controlling the dyeing speed and preventing uneven dyeing. As the temperature increases subsequently, the color gain steadily increases, eventually reaching a color comparable to the blank. Combined with the migration rate data in Table 2, this demonstrates that the unique leveling agent of this invention has excellent retarding and migration capabilities, further ensuring smooth dyeing. Even with high electrolyte levels in recycled water, the performance of the auxiliary agent remains unaffected, meeting the needs of actual production and improving the first-pass success rate of dyeing and finishing processes.

[0089] In summary, the unique leveling agent of this invention exhibits high electrolyte tolerance and maintains excellent oil removal emulsification even when the conductivity of recycled water exceeds 3000 μS / cm. The addition of amphoteric surfactants regulates the surface charge of the fibers, preventing dye aggregation and providing synergistic emulsification, slow dyeing, and dispersion. This unique leveling agent also demonstrates outstanding high-temperature and salt resistance, showing excellent performance in the same bath process for oil removal and dyeing of polyester and its blended fabrics, especially polyester-spandex blended fabrics, ensuring fabric processing quality and reducing energy consumption.

Claims

1. A special leveling agent for polyester and its blended fabrics, comprising the following components based on 100% by weight of the total weight of the special leveling agent: C12-15 alkyl alcohol polyoxyethylene ether: 13-26% by weight Modified polyether ester: 12-22% by weight Phenolic ether sulfate: 4-10% by weight Salt-tolerant comb-type amphoteric surfactants: 17-32% by weight, and Water: 12-45% by weight.

2. The special leveling agent for polyester and its blended fabrics as described in claim 1, characterized in that, The C12-15 alkyl alcohol polyoxyethylene ether is a straight-chain fatty alcohol polyoxyethylene ether or an isomeric alcohol polyoxyethylene ether, and the number of oxyethylene ether structural units is 3-10.

3. The special leveling agent for polyester and its blended fabrics as described in claim 1, characterized in that, The modified polyether ester is a cashew phenol-modified polyether oleate.

4. The special leveling agent for polyester and its blended fabrics as described in claim 1, characterized in that, The phenolic ether sulfate mentioned is cashew phenol polyether sulfate.

5. The special leveling agent for polyester and its blended fabrics as described in claim 1, characterized in that, The structure of the salt-resistant comb-type amphoteric surfactant is shown in the following formula: Where n = 16-30, and a:b:c = 1.8-2.2:1:4.8-5.

4.

6. The special leveling agent for polyester and its blended fabrics as described in claim 5, characterized in that, The salt-resistant comb-type amphoteric surfactant is copolymerized from tetradecene, allyl polyether (APEG), and sulfobetaine methacrylate (SBMA).

7. The special leveling agent for polyester and its blended fabrics as described in claim 5 or 6, characterized in that, The weight-average molecular weight of the salt-resistant comb-type amphoteric surfactant is 80,000-120,000.

8. The special leveling agent for polyester and its blended fabrics as described in claim 5 or 6, characterized in that, The preparation method of the salt-resistant comb-type amphoteric surfactant includes the following steps: (1) Mix allyl polyether APEG, sulfobetaine methacrylate SBMA, tetradecene, water and Span-80 to form an emulsion; (2) Heat to 68-72℃, add initiator dropwise, maintain 68-72℃ for 4 hours, then heat to 75℃ for 1 hour to obtain salt-resistant comb-type amphoteric surfactant.

9. A method for preparing the special leveling agent for polyester and blended fabrics according to any one of claims 1-8, comprising the following steps: (1) Add C12-15 alkyl alcohol polyoxyethylene ether, modified polyether ester, phenolic ether sulfate, salt-resistant comb-type amphoteric surfactant and water, heat to 50-70℃ and stir for 30-50 minutes; (2) Cool to room temperature to obtain a special leveling agent.

10. The application of the special leveling agent for polyester and blended fabrics according to any one of claims 1-8 in the degreasing and dyeing process of polyester-ammonia blended fabrics under recycled water conditions.

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