A method for hot melt dyeing of high dye uptake nano liquid dyes

Abstract

The present application relates to the technical field of textile printing and dyeing, and discloses a hot melt dyeing method of high-dye-uptake nano liquid dye, which comprises the following steps: S1, dip-dyeing and dip-padding of polyester fabric in a dyeing solution, wherein the dyeing solution comprises modified nano liquid dye, thickening agent, defoaming agent and water; the modified nano liquid dye is modified polyaniline layer-coated nano liquid dye; S2, drying and baking treatment of the dip-padded polyester fabric; S3, finally, post-finishing is performed to obtain a polyester dyed product. The present application selects nano liquid dye, which has low impurity content and high dyeing rate, and the color light can reach the standard without washing. The excellent dyeing uniformity and dyeing color fastness of the modified polyaniline layer-coated nano liquid dye are relied on, and the hot melt dyeing process is adopted, and the appropriate post-finishing process is selected, so that the traditional dyeing effect is achieved, and the purpose of energy saving and emission reduction is finally realized.

Description

Technical Field

[0001] This invention relates to the technical field of textile printing and dyeing, and in particular to a hot melt dyeing method for nano-liquid dyes with high dyeing rates. Background Technology

[0002] Nano-liquid dyes specifically refer to liquid disperse dyes. Their setting and padding principle relies on the vibrant colors, excellent water fastness, and rubbing fastness exhibited by liquid dyes. Through a hot-melt dyeing process, the washing step is eliminated, achieving "waterless dyeing" of polyester fabrics. This saves dyeing water and reduces wastewater discharge, making it increasingly popular in the dyeing market in today's environmentally conscious world. Existing technologies using nano-liquid dyes for setting and padding change the traditional dyeing process, employing a hot-melt dyeing flow. This not only saves dyeing water during the dyeing process but also saves washing water for waterless fabrics. Its greatest advantage lies in its high production speed, significantly shortening the delivery cycle.

[0003] However, pure polyester fabrics are not entirely suitable for hot-melt dyeing. Due to the hydrophobic nature and smooth surface of polyester fibers, dyes lack strong binding forces and are prone to migration, leading to uneven dye development during the high-temperature heat treatment in the drying process. Furthermore, existing liquid disperse dyes tend to exhibit a sharp increase in particle size at high temperatures, even resulting in aggregation and precipitation, which also contributes to uneven dyeing and uneven color development. In addition, dispersants are usually added to improve the uniformity of dye dispersion during hot-melt dyeing. However, the addition of dispersants is detrimental to the dye's fixation and binding to the fibers, resulting in more floating dye on the surface of the polyester fabric. Moreover, the effects of dispersants and thickeners are contradictory, as dispersants will reduce viscosity in the dye bath, thereby decreasing the amount of dye adsorbed. Therefore, balancing dye dispersibility and binding properties is a key issue in improving the dyeing rate during hot-melt dyeing with nano-liquid dyes. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a hot-melt dyeing method for nano-liquid dyes with high dyeing rates. By employing modified nano-liquid dyes and a hot-melt dyeing process, along with selecting appropriate finishing processes, the method effectively improves dye dispersion and binding, achieving not only the traditional dyeing effect but also ultimately realizing energy conservation and emission reduction.

[0005] The specific technical solution of this invention is: a hot-melt dyeing method for nano-liquid dyes with high dyeing rates, comprising the following steps: S1. The polyester fabric is subjected to two dips and two nips in a dyeing solution, wherein the dyeing solution includes a modified nano-liquid dye, a thickener, an antifoaming agent and water; the modified nano-liquid dye is a modified polyaniline-coated nano-liquid dye. S2. Dry and bake the impregnated polyester fabric. S3. Finally, after finishing, the polyester dyed products are obtained.

[0006] This invention utilizes nano-liquid dyes, which have low impurity content and high dye uptake. The color meets standards without washing. Leveraging the excellent water fastness and rubbing fastness exhibited by liquid dyes, a hot-melt dyeing process is employed, along with appropriate finishing techniques, to not only achieve traditional dyeing effects but also ultimately realize energy conservation and emission reduction. Furthermore, the dyes require synergistic effects from complementary auxiliaries, including specialized no-wash thickeners, penetrants, and defoamers, to achieve satisfactory color, fabric surface effects, and fabric style and feel.

[0007] Furthermore, to avoid the aggregation and precipitation of nano-liquid dyes at high temperatures, and to improve their bonding with polyester fibers and prevent dye migration, this invention employs modified polyaniline to coat the nano-liquid dyes. Polyaniline not only enhances the heat resistance and high-temperature stability of the dye, but the numerous benzene rings in its molecular chain can also anchor to the dye surface using strong π-π interactions. Modified polyaniline also exhibits good water solubility and dispersibility, as well as good bonding with polyester fibers, thereby improving the dyeing uniformity and colorfastness after hot-melt dyeing.

[0008] Preferably, the preparation method of the modified nano-liquid dye includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid for the first heating reaction, add olefin-based silane coupling agent and dicumyl peroxide to the product for the second heating reaction, and after the reaction is completed, distill under reduced pressure and add water to separate the product to obtain modified aniline; (2) After mixing the nano liquid dye and modified aniline in an aqueous solution of sodium dodecylbenzenesulfonate, the pH was first adjusted to 4-5 and stirred for 40-50 min, then the pH was adjusted to 0.5-1 and stirred for 10-20 min; then n-butanol was added to form a microemulsion, and then an aqueous solution of ammonium persulfate was added and stirred to react. After the reaction was completed, the emulsion was broken and separated to obtain the modified nano liquid dye.

[0009] In this invention, aniline is grafted and modified with β-acryloyloxypropionic acid and an olefin-based silane coupling agent. By controlling the grafting amount, the modified polyaniline not only possesses water solubility but also, through its abundant benzene rings and strong π-π interactions, anchors itself to the dye surface. The longer grafted chains create steric hindrance, preventing collisions and aggregation between dye particles and improving dye dispersibility. These longer grafted chains also disrupt the hydrogen bonds between the molecular chains during polyaniline formation, effectively preventing gel formation while maintaining good adhesion to polyester fibers, further enhancing the uniformity of dye distribution on the polyester fabric surface.

[0010] In the initial stage of emulsion polymerization of modified aniline, it can be anchored to the dye surface using π-π forces. Adjusting the pH to a weakly acidic state promotes the hydrolysis of the silane coupling agent, further enhancing the water solubility of the modified aniline and facilitating subsequent polymerization. Furthermore, hydrolysis is accompanied by self-polymerization; by controlling the reaction conditions, a polymer layer can be formed more quickly on the dye particle surface, improving its density and bonding. The long molecular chains formed after the silane coupling agent's self-polymerization also optimize steric hindrance, reducing intra-chain hydrogen bonds between polyaniline molecules and preventing the formation of gel-like polyaniline that leads to dye aggregation and precipitation. Subsequently, adjusting the pH to a strong acidic state inhibits the hydrolysis of the silane coupling agent, further promoting the polymerization of aniline.

[0011] Therefore, the modified nano-liquid dye in this invention, due to its surface-modified polyaniline coating, exhibits better high-temperature resistance, dispersibility, and penetration and binding with polyester fibers, thereby achieving a better dyeing rate. Siloxanes provide a softening effect to fabrics, improving hand feel and giving polyester fibers a fluffy and soft feel, which is beneficial to improving the quality of dyed products.

[0012] Preferably, in step (1), the mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 2~3:50:0.6~0.9:0.05~0.1; the first heating reaction is heated to 45~55℃ for 1~2h; the ratio of the amount of the obtained product, the olefinic silane coupling agent and dicumyl peroxide added is 50:1.3~1.9:0.2~0.3; the second heating reaction is heated to reflux for 40~60min; the olefinic silane coupling agent is one of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(β-methoxyethoxy)silane and allyltrimethoxysilane.

[0013] Preferably, in step (2), the mass concentration of the aqueous solution of sodium dodecylbenzenesulfonate is 1~1.2%; the mass ratio of the nano-liquid dye, modified aniline and aqueous solution of sodium dodecylbenzenesulfonate is 20~25:3~5:100; the stirring and mixing time is 20~30 min; the mass ratio of the aqueous solution of n-butanol, ammonium persulfate and aqueous solution of sodium dodecylbenzenesulfonate is 2~3:10:100; the mass concentration of the aqueous solution of ammonium persulfate is 8.5~9%; and the stirring reaction time is 6~8 h.

[0014] Preferably, the slurry yield of the two dips and two rolls is 60-70%, and the dip and roll temperature is room temperature.

[0015] Preferably, the drying is performed at 70~80℃ for 10~20 minutes; the baking is performed at 210~220℃ for 120~140 seconds.

[0016] Preferably, the post-processing includes sequentially performing shaping and waterproofing, calendering, and coating.

[0017] Preferably, the shaping and waterproofing process involves adding a waterproofing agent and then performing a shaping treatment at a temperature of 180-200℃ for 18-22 seconds.

[0018] The dyed fabrics are then treated with a water-repellent process to achieve good water resistance.

[0019] Preferably, the calendering process involves: a mirror roller temperature of 185~200℃, a rolling pressure of 100~110 kg / cm², and a speed of 30~35 m / min.

[0020] The calendering process is mainly to make the fabric structure denser and improve the gloss of the coating surface.

[0021] Preferably, the coating finishing includes PA coating finishing and / or PU coating finishing.

[0022] Compared with the prior art, the present invention has the following advantages: (1) The present invention uses nano liquid dyes, which have low impurity content and high dyeing rate. The color can meet the standard without washing. Relying on the excellent water fastness and rubbing fastness of liquid dyes, by adopting the hot melt dyeing process and selecting appropriate finishing process, it can not only achieve the traditional dyeing effect, but also ultimately achieve the purpose of energy saving and emission reduction. (2) The modified nano liquid dye in this invention can avoid the aggregation and precipitation phenomenon that nano liquid dye is prone to occur at high temperature, improve its binding with polyester fiber, and avoid dye migration. (3) Using modified polyaniline to coat nano liquid dyes can not only improve the heat resistance and high temperature stability of the dyes, but also the large number of benzene rings contained in its molecular chain can be anchored on the dye surface by utilizing its strong π-π interaction force. Furthermore, modified polyaniline also has good water solubility and dispersibility as well as good binding with polyester fibers, thereby improving the dyeing uniformity and color fastness after hot melt dyeing. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments.

[0024] General Implementation Examples A hot-melt dyeing method for nano-liquid dyes with high dyeing efficiency includes the following steps: S1. The polyester fabric (the base fabric is polyester spring spun yarn, the warp and weft yarn specifications are both 75D / 36F, the warp and weft density reaches 180 strands, and the fabric is treated with seam ends) is dipped and rubbed twice in the dyeing solution, the rubbing rate is 60~70%, the immersion and rubbing temperature is room temperature, and the dyeing solution includes modified nano liquid dye, thickener, defoamer and water. The preparation method of modified nano-liquid dyes includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid, mix and heat to 45~55℃ for 1~2h. The mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 2~3:50:0.6~0.9:0.05~0.1. Add olefin silane coupling agent and dicumyl peroxide to the obtained product, mix and heat to reflux for 40~60min. The ratio of the amount of the obtained product, olefin silane coupling agent and dicumyl peroxide is 50:1.3~1.9:0.2~0.3. The olefin silane coupling agent is one of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(β-methoxyethoxy)silane and allyltrimethoxysilane. After the reaction is completed, distill under reduced pressure and separate with water to obtain modified aniline. (2) Add the nano-liquid dye and modified aniline to an aqueous solution of sodium dodecylbenzenesulfonate with a mass concentration of 1-1.2% and stir for 20-30 min. The mass ratio of the nano-liquid dye, modified aniline and sodium dodecylbenzenesulfonate aqueous solution is 20-25:3-5:100. Then, adjust the pH to 4-5 with acetic acid and stir for 40-50 min. Then, adjust the pH to 0.5-1 with concentrated hydrochloric acid and stir for 10-20 min. Next, add n-butanol to form a microemulsion, and then add an aqueous solution of ammonium persulfate with a mass concentration of 8.5-9%. Stir and react for 6-8 h. The mass ratio of the n-butanol, ammonium persulfate aqueous solution and sodium dodecylbenzenesulfonate aqueous solution is 2-3:10:100. After the reaction is completed, demulsify and separate to obtain the modified nano-liquid dye.

[0025] S2. After drying the impregnated polyester fabric at 70~80℃ for 10~20min, bake it at 210~220℃ for 120~140s. S3. Finally, post-processing is carried out. First, the product is set and waterproofed by adding a waterproofing agent (fluorocarbon waterproofing agent 3683, 4% addition) and then set at a temperature of 180~200℃ for 18~22s. Next, the product is calendered at a mirror roller temperature of 185~200℃, a rolling pressure of 100~110 kg / cm², a speed of 30~35m / min, and one pass on a double-roll calender. Finally, the product is coated, including PA coating and / or PU coating, to obtain the polyester dyed product.

[0026] Example 1 A hot-melt dyeing method for nano-liquid dyes with high dyeing efficiency includes the following steps: S1. The polyester fabric (the base fabric is polyester spring spun yarn, the warp and weft yarn specifications are both 75D / 36F, the warp and weft density reaches 180 strands, and the fabric is treated with seam end) is dipped and nibbled twice in the dyeing solution, the nibbling rate is 60%, the nibbling temperature is room temperature, and the dyeing solution includes modified nano liquid dye, thickener TF-392B, defoamer TF-107 and water in a mass ratio of 0.1:0.01:0.006:0.003:100; The preparation method of nano-liquid dyes includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid, and heat to 50°C for 2 hours. The mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 3:50:0.85:0.1. Add vinyltriethoxysilane and dicumyl peroxide to the product and heat to reflux for 55 minutes. The ratio of the amount of product, vinyltriethoxysilane and dicumyl peroxide added is 50:1.6:0.2. After the reaction is completed, distill under reduced pressure and separate with water to obtain modified aniline. (2) Add nano liquid dye (Transfar Smart Technology Co., Ltd., high temperature resistant nano liquid dye SK-345) and modified aniline to an aqueous solution of sodium dodecylbenzenesulfonate with a mass concentration of 1% and stir for 30 min. The mass ratio of nano liquid dye, modified aniline and sodium dodecylbenzenesulfonate aqueous solution is 25:4:100. Then, adjust the pH to 4-5 with acetic acid and stir for 40 min. Then, adjust the pH to 0.5-1 with concentrated hydrochloric acid and stir for 15 min. Next, add n-butanol to form a microemulsion and then add an aqueous solution of ammonium persulfate with a mass concentration of 8.5%. Stir and react for 8 h. The mass ratio of n-butanol, ammonium persulfate aqueous solution and sodium dodecylbenzenesulfonate aqueous solution is 3:10:100. After the reaction is completed, demulsification and separation are performed to obtain modified nano liquid dye.

[0027] S2. After drying the impregnated polyester fabric at 80℃ for 10 min, bake it at 220℃ for 130 s to obtain the polyester dyed product.

[0028] Example 2 A hot-melt dyeing method for nano-liquid dyes with high dyeing efficiency includes the following steps: S1. The polyester fabric (the base fabric is polyester spring spun yarn, the warp and weft yarn specifications are both 75D / 36F, the warp and weft density reaches 180 strands, and the fabric is treated with seam end) is dipped and nibbled twice in the dyeing solution, the nibbling rate is 60%, the nibbling temperature is room temperature, and the dyeing solution includes nano liquid dye, thickener TF-392B, defoamer TF-107 and water in a mass ratio of 0.1:0.01:0.006:0.003:100; The preparation method of modified nano-liquid dyes includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid, and heat to 50°C for 1 h. The mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 3:50:0.6:0.06. Add allyltrimethoxysilane and dicumyl peroxide to the product and heat to reflux for 40 min. The ratio of the amount of product, allyltrimethoxysilane and dicumyl peroxide is 50:1.3:0.2. After the reaction is completed, distill under reduced pressure and separate with water to obtain modified aniline. (2) Nano liquid dye (Transfar Smart Technology Co., Ltd., high temperature resistant nano liquid dye SK-345) and modified aniline were added to an aqueous solution of sodium dodecylbenzenesulfonate with a mass concentration of 1.2% and stirred for 25 min. The mass ratio of nano liquid dye, modified aniline and sodium dodecylbenzenesulfonate aqueous solution was 23:5:100. Then, the pH was adjusted to 4-5 with acetic acid and stirred for 50 min. The pH was then adjusted to 0.5-1 with concentrated hydrochloric acid and stirred for 15 min. Next, n-butanol was added to form a microemulsion. Then, an aqueous solution of ammonium persulfate with a mass concentration of 9% was added and stirred for 8 h. The mass ratio of n-butanol, ammonium persulfate aqueous solution and sodium dodecylbenzenesulfonate aqueous solution was 3:10:100. After the reaction was completed, demulsification and separation were performed to obtain the modified nano liquid dye.

[0029] S2. After drying the impregnated polyester fabric at 80℃ for 10 min, bake it at 220℃ for 130 s to obtain the polyester dyed product.

[0030] Example 3 A hot-melt dyeing method for nano-liquid dyes with high dyeing efficiency includes the following steps: S1. The polyester fabric (the base fabric is polyester spring spun yarn, the warp and weft yarn specifications are both 75D / 36F, the warp and weft density reaches 180 strands, and the fabric is treated with seam end) is dipped and nibbled twice in the dyeing solution, the nibbling rate is 60%, the nibbling temperature is room temperature, and the dyeing solution includes modified nano liquid dye, thickener TF-392B, defoamer TF-107 and water in a mass ratio of 0.1:0.01:0.006:0.003:100; The preparation method of modified nano-liquid dyes includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid, and heat to 45°C for 2 hours. The mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 2.5:50:0.9:0.08. Add vinyltriethoxysilane and dicumyl peroxide to the product and heat to reflux for 40 minutes. The ratio of the amount of product, vinyltriethoxysilane and dicumyl peroxide is 50:1.5:0.2. After the reaction is completed, distill under reduced pressure and separate with water to obtain modified aniline. (2) Nano liquid dye (Transfar Smart Technology Co., Ltd., high temperature resistant nano liquid dye SK-345) and modified aniline were added to an aqueous solution of sodium dodecylbenzenesulfonate with a mass concentration of 1.2% and stirred for 30 min. The mass ratio of nano liquid dye, modified aniline and sodium dodecylbenzenesulfonate aqueous solution was 20:3:100. Then, the pH was adjusted to 4-5 with acetic acid and stirred for 40 min. The pH was then adjusted to 0.5-1 with concentrated hydrochloric acid and stirred for 20 min. Next, n-butanol was added to form a microemulsion. Then, an aqueous solution of ammonium persulfate with a mass concentration of 8.5% was added and stirred for 7 h. The mass ratio of n-butanol, ammonium persulfate aqueous solution and sodium dodecylbenzenesulfonate aqueous solution was 2:10:100. After the reaction was completed, demulsification and separation were performed to obtain the modified nano liquid dye.

[0031] S2. After drying the impregnated polyester fabric at 80℃ for 10 min, bake it at 220℃ for 130 s to obtain the polyester dyed product.

[0032] Example 4 The difference from Example 1 is that a post-processing step was performed.

[0033] The polyester dyed products prepared in Example 1 were then finished by first setting and waterproofing. A waterproofing agent (fluorocarbon waterproofing agent 3683, 4% addition) was added, followed by a setting treatment at 180-200℃ for 18-22 seconds. Next, calendering was performed at a mirror roller temperature of 185-200℃, a rolling pressure of 100-110 kg / cm², and a speed of 30-35 m / min, using a double-roll calender in one pass. Finally, a coating process was performed, with two repeated coatings: PA primer: 100 parts PA resin (acrylate), 8 parts toluene diluent, 2 parts crosslinking agent 1086, and 1 part accelerator T-240; PU topcoat: 40 parts polyurethane resin 3050, 60 parts polyurethane resin 2258, 60 parts toluene diluent, 4 parts melamine crosslinking agent 7180A, 2 parts melamine accelerator T280, 5 parts anti-adhesion agent 2107, and 3 parts YC-30. 40 parts of black paste PU568 were used to obtain finished polyester dyed products.

[0034] Comparative Example 1 The difference from Example 1 is that conventional nano-liquid dyes are added.

[0035] Includes the following steps: S1. The polyester fabric (the base fabric is polyester spring spun yarn, both warp and weft yarns are 75D / 36F, and the warp and weft density reaches 180 strands, and the fabric is treated with seam ends) is dipped and nibbled twice in the dyeing solution, with a nibble rate of 60% and a nibble temperature of room temperature. The dyeing solution includes nano liquid dye (Transfar Smart Technology Co., Ltd., high temperature resistant nano liquid dye SK-345), thickener TF-392B, defoamer TF-107 and water in a mass ratio of 0.1:0.01:0.006:0.003:100. S2. After drying the impregnated polyester fabric at 80℃ for 10 min, bake it at 220℃ for 130 s to obtain the polyester dyed product.

[0036] Comparative Example 2 The difference from Example 1 is that aniline was not modified during the preparation of the modified nano-liquid dye.

[0037] The preparation method of nano-liquid dyes includes the following steps: (1) Nano liquid dye (Transfar Smart Technology Co., Ltd., high temperature resistant nano liquid dye SK-345) and aniline were added to an aqueous solution of sodium dodecylbenzenesulfonate with a mass concentration of 1% and stirred for 30 min. The mass ratio of nano liquid dye, aniline and sodium dodecylbenzenesulfonate aqueous solution was 25:4:100. Then, the pH was adjusted to 0.5-1 with concentrated hydrochloric acid and stirred for 15 min. Next, n-butanol was added to form a microemulsion, and then an aqueous solution of ammonium persulfate with a mass concentration of 8.5% was added. The mixture was stirred and reacted for 8 h. The mass ratio of n-butanol, ammonium persulfate aqueous solution and sodium dodecylbenzenesulfonate aqueous solution was 3:10:100. After the reaction was completed, the emulsion was broken and separated to obtain the modified nano liquid dye.

[0038] Comparative Example 3 The difference from Example 1 is that aniline was not polymerized during the preparation of the modified nano-liquid dye.

[0039] The preparation method of modified nano-liquid dyes includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid, and heat to 50°C for 2 hours. The mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 3:50:0.85:0.1. Add vinyltriethoxysilane and dicumyl peroxide to the product and heat to reflux for 55 minutes. The ratio of the amount of product, vinyltriethoxysilane and dicumyl peroxide added is 50:1.6:0.2. After the reaction is completed, distill under reduced pressure and separate with water to obtain modified aniline. (2) Add nano liquid dye (Transfar Smart Company, high temperature resistant nano liquid dye SK-345) and modified aniline to water and stir for 30 min. The mass ratio of nano liquid dye, modified aniline and water is 25:4:100. Then perform vacuum distillation to obtain modified nano liquid dye.

[0040] Comparative Example 4 The difference from Example 1 is that the pH was not adjusted during the preparation of the modified nano-liquid dye.

[0041] The preparation method of modified nano-liquid dyes includes the following steps: (1) Add aniline to ethanol, then add β-acryloyloxypropionic acid and glacial acetic acid, and heat to 50°C for 2 hours. The mass ratio of aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid is 3:50:0.85:0.1. Add vinyltriethoxysilane and dicumyl peroxide to the product and heat to reflux for 55 minutes. The ratio of the amount of product, vinyltriethoxysilane and dicumyl peroxide added is 50:1.6:0.2. After the reaction is completed, distill under reduced pressure and separate with water to obtain modified aniline. (2) Add nano liquid dye (Transfar Smart Technology Co., Ltd., high temperature resistant nano liquid dye SK-345) and modified aniline to an aqueous solution of sodium dodecylbenzenesulfonate with a mass concentration of 1% and stir for 30 min. The mass ratio of nano liquid dye, modified aniline and sodium dodecylbenzenesulfonate aqueous solution is 25:4:100. Then adjust the pH to 0.5-1 directly with concentrated hydrochloric acid and stir for 15 min. Then add n-butanol to form a microemulsion and add an aqueous solution of ammonium persulfate with a mass concentration of 8.5%. Stir and react for 8 h. The mass ratio of n-butanol, ammonium persulfate aqueous solution and sodium dodecylbenzenesulfonate aqueous solution is 3:10:100. After the reaction is completed, demulsification and separation are performed to obtain modified nano liquid dye.

[0042] Performance testing Color uniformity: Tested on an UltraScan-XE computer colorimeter using a D65 light source and 10 o From different perspectives, the K / S values ​​of the examples and comparative examples were tested 15 times at different locations on the fabric. The relative deviation of the average K / S value was calculated, representing the unevenness of the fabric dyeing. The smaller the value, the more uniform the dyed fabric.

[0043] Light fastness: GB / T8427-1997; Color fastness to soap washing: GB / T 3921-2008; Color fastness to rubbing: GB3920-1997; Waterproof rating: GB / T 4745-2012.

[0044] Table 1

[0045] Table 1 shows that the comparative examples demonstrate that the modified nano-liquid dyes coated with modified polyaniline in this invention can avoid the aggregation and precipitation phenomena that easily occur in nano-liquid dyes at high temperatures, improve their binding with polyester fibers, avoid dye migration, and thus improve the dyeing uniformity and color fastness after hot melt dyeing. Comparative Example 2 shows that the water solubility of the polyaniline obtained without modification is poor, and the strong hydrogen bonding between molecular chains is actually detrimental to the dye dispersion. Comparative Example 3 shows that the modified aniline is not polymerized, and its coating binding on the dye surface will be affected, and the high temperature resistance of the dye will not be significantly improved, resulting in poor dyeing uniformity and color fastness. Comparative Example 4 shows that pH adjustment is particularly important for inducing the hydrolysis and self-polymerization of silane coupling agents. The limiting conditions in this invention not only facilitate the obtaining of modified polyaniline with better water solubility, but also avoid the dye aggregation phenomenon caused by the strong hydrogen bonding between polyaniline molecular chains, thus improving dispersion.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A hot-melt dyeing method for nano-liquid dyes with high dyeing rates, characterized in that, include: S1. The polyester fabric is dipped and rubbed twice in a dyeing solution, which includes modified nano liquid dye, thickener, defoamer and water; The preparation of modified nano-liquid dyes includes: (1) Mix aniline, ethanol, β-acryloyloxypropionic acid and glacial acetic acid in a mass ratio of 2~3:50:0.6~0.9:0.05~0.1 and react at 45~55℃ for 1~2h; mix the resulting product with olefin-based silane coupling agent and dicumyl peroxide in a ratio of 50:1.3~1.9:0.2~0.3 and heat for a second reaction. After the reaction, distill under reduced pressure and separate with water to obtain modified aniline; (2) Mix the nano liquid dye, modified aniline and sodium dodecylbenzenesulfonate in an aqueous solution at a mass ratio of 20~25:3~5:100, adjust the pH to 4-5 and stir for 40~50 min, then adjust the pH to 0.5-1 and stir for 10~20 min; add n-butanol to form a microemulsion, add an aqueous solution of ammonium persulfate, stir to react, and then break the emulsion and separate the components after the reaction. S2. Dry and bake the impregnated polyester fabric; S3. After finishing, polyester dyed products are obtained.

2. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in claim 1, characterized in that, In step (1), the second heating reaction is heating to reflux for 40-60 min; the olefin-based silane coupling agent is one of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(β-methoxyethoxy)silane, and allyltrimethoxysilane.

3. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in claim 1, characterized in that, In step (2), the mass concentration of the aqueous solution of sodium dodecylbenzenesulfonate is 1~1.2%; the mass ratio of the aqueous solution of n-butanol, ammonium persulfate and sodium dodecylbenzenesulfonate is 2~3:10:100; the mass concentration of the aqueous solution of ammonium persulfate is 8.5~9%; and the stirring reaction time is 6~8h.

4. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in any one of claims 1-3, characterized in that, The liquid yield of the two dips and two rolls is 60-70%, and the dip and roll temperature is room temperature.

5. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in any one of claims 1-3, characterized in that, The drying process is carried out at 70-80℃ for 10-20 minutes; the baking process is carried out at 210-220℃ for 120-140 seconds.

6. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in claim 1, characterized in that, The finishing process includes sequential shaping and waterproofing, calendering, and coating.

7. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in claim 6, characterized in that, The specific steps of the waterproofing process are as follows: after adding the waterproofing agent, a waterproofing treatment is performed at a temperature of 180~200℃ for 18~22 seconds.

8. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in claim 6, characterized in that, The calendering process specifically involves: a mirror roller temperature of 185~200℃, a rolling pressure of 100~110 kg / cm², and a speed of 30~35 m / min.

9. The hot-melt dyeing method for high-dyeing-rate nano-liquid dyes as described in any one of claims 6-8, characterized in that, The coating finishing includes PA coating finishing and / or PU coating finishing.

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