Low-energy-consumption short-process homochromatic fabric dyeing and finishing process

Abstract

The invention belongs to the technical field of textile printing and dyeing, and particularly belongs to a low-energy-consumption short-process homochromatic fabric dyeing and finishing process. The process comprises the following steps: soaking a fabric in a treating fluid A, and pre-shaping to obtain a pre-shaped fabric; soaking the pre-shaped fabric in the dye liquor to obtain a dip-dyed fabric; washing the dip-dyed fabric, and neutralizing with acid to obtain a neutralized fabric; dehydrating the neutralized fabric to obtain a dehydrated fabric; and padding the dehydrated fabric in the treating fluid B, and baking and shaping after padding to obtain the dyed and finished fabric. According to the process, three components with large physical and chemical property differences are dyed in the same dye bath, high homochromatism of the components is guaranteed, the process energy consumption is low, and the flow is short. Wherein the three components are polyamide 66, shrink-proof wool and thermoplastic polyurethane fibers.

Description

Technical Field

[0001] This invention belongs to the field of textile printing and dyeing technology, specifically to the process of low-energy consumption, short-process, same-color dyeing and finishing of fabrics. Background Technology

[0002] When dyeing with acid dyes, the dye saturation of wool is approximately 25 times that of nylon. Acid dyes also take up dye faster on nylon than on wool. Therefore, the color matching of nylon-wool composite fabrics is poor; nylon absorbs the dye more deeply in light colors, while wool absorbs it more deeply in dark colors, resulting in a patchy fabric surface and poor color matching.

[0003] Patent application CN112227095A discloses a one-bath, one-step dyeing method for wool / polyamide 56 fiber blended fabrics. It uses acid dyes or 1:2 metal complex dyes to dye wool / polyamide 56 fiber blended fabrics in a one-bath, one-step process. The provided dyeing process improves the color matching of wool and polyamide 56 fibers during one-bath dyeing. However, when the one-bath dyeing process for wool / polyamide 56 fiber blends is applied to wool / polyamide 6 or polyamide 66 blended fabrics, the wool color tends to be darker than the polyamide fiber. While the color matching between wool and polyamide 56 is improved when applying the one-bath dyeing process for wool / polyamide 6 or polyamide 66 blended fabrics to wool / polyamide 56 fiber blends, the wool color is still lighter than the polyamide 56. This indicates that CN112227095A does not completely solve the color matching problem: the color matching of wool and polyamide 66 in one-bath dyeing still exhibits a very significant difference.

[0004] The patent with publication number CN112176741B also discloses a one-bath dyeing solution and dyeing method for a blend of nylon and wool fibers. Like CN112227095A, it uses nylon 56 and does not overcome the dyeing problem of wool and nylon 66.

[0005] Patent application CN104328694A discloses a one-bath dyeing method for shrink-resistant wool / Tencel / nylon blended fabrics. Using cotton reactive dyes and dyeing under weakly alkaline conditions, it can give the shrink-resistant wool / Tencel / nylon blended fabrics a visually pleasing solid color effect without stains or uneven coloring. Although the dyeing is carried out under weakly alkaline conditions, the low dyeing temperature and the low alkalinity of the dye bath cause negligible damage to the wool. However, it still suffers from a lack of process simplification and can only improve the color uniformity of solid color dyeing, thus having significant limitations.

[0006] In summary, existing technologies have poor dyeing effects on composite fabrics made of shrink-resistant wool, polyamide 66, and thermoplastic polyurethane fibers, resulting in poor dye absorption and a high amount of residual dye in the dye solution. Therefore, they cannot provide an economical and environmentally friendly solution for dyeing such composite fabrics. Summary of the Invention

[0007] To address the technical problems in the prior art, this invention provides a low-energy-consumption, short-process, same-color dyeing and finishing process for fabrics.

[0008] The technical solution of the present invention includes the following: The process for low-energy, short-process, same-color dyeing and finishing of fabrics includes the following steps: The fabric is immersed in treatment solution A and pre-shaped to obtain a pre-shaped fabric. The pre-shaped fabric is immersed in the dye solution to obtain the dyed fabric. The dyed fabric is washed and neutralized with acid to obtain a neutralized fabric. The neutralized fabric is then dehydrated to obtain the dehydrated fabric. The dehydrated fabric is immersed in padding solution B, and then baked and shaped to obtain the dyed and finished fabric.

[0009] Preferably, the predetermined temperature is 105℃-125℃, and the predetermined speed is set to 18-24 yards / min.

[0010] Preferably, the parameters for immersing the pre-shaped fabric in the dye bath include: pH 6.0-8.0, and treatment at a temperature of 80℃-110℃ for 30-90 minutes.

[0011] Preferably, the cleaning parameters include: cleaning at 60℃-80℃ for 10min-30min, and pH 8.0-8.5.

[0012] Preferably, the acid neutralization parameters include: acid neutralization at 20℃-40℃ for 10min-30min.

[0013] Preferably, the baking and setting parameters include baking and setting at 100℃-130℃ and a speed of 16-24 yards / min.

[0014] Preferably, the fabric is made by interweaving or blending polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fibers.

[0015] Preferably, each liter of treatment solution A contains 0.5g-5.0g of refining emulsifier, which includes fatty alcohols and polyethoxylated alcohols.

[0016] Preferably, each liter of dye liquor contains: 0.5g-4.0g reactive dye leveling agent, 0.5g-4.0g acid dye leveling agent, 4.0g-10.0g directional crosslinking agent, 2.0g-10.0g reactive dye, and 0.5g-3.5g acid dye; wherein the reactive dye leveling agent includes a condensate of fatty alcohol and ethylene oxide, the acid dye leveling agent includes polyethylene glycol ether, the directional crosslinking agent includes inorganic salt, the reactive dye includes a reactive dye with a bis-reactive azo structure, and the acid dye includes an acid dye with a 1:2 metal complex structure.

[0017] Preferably, each liter of treatment solution B contains: 5-20 g / L of a smooth and durable softener and 5-20 g / L of a wool smoothing softener; wherein the smooth and durable softener includes linear block silicone; and the wool smoothing softener includes ternary block copolymer silicone.

[0018] Preferably, each liter of dyeing solution contains: 0.5g-4.0g of block cationic leveling agent, 4.0g-10.0g of directional crosslinking agent, 2.0g-10.0g of reactive dye, and 0.5g-3.5g of acid dye; wherein the preparation method of the block cationic leveling agent includes the following steps: Fatty alcohol, polyethylene glycol, polypropylene glycol and isopropanol are mixed and heated to 85-95℃ to mix and dissolve. Then the temperature is lowered to 65-75℃, and a catalyst is added and stirred. The temperature is lowered to 55-65℃, and 3-chloro-2-hydroxypropyltrimethylammonium chloride is slowly added dropwise. After the addition is complete, the reaction is continued at 765-75℃. After the reaction is terminated, the mixture is cooled. The mixture is then purified by precipitation and dried under vacuum to obtain a block-type cationic leveling agent.

[0019] Furthermore, 3-chloro-2-hydroxypropyltrimethylammonium chloride includes 3-chloro-2-hydroxypropyltrimethylammonium chloride, the catalyst includes triethylamine, and the fatty alcohol includes C12-14 straight-chain fatty alcohols.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The process of the present invention enables the dyeing of three components with large differences in physicochemical properties (polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fiber) in the same dye bath, while ensuring high color uniformity, low energy consumption, and short process.

[0021] (1) The specific technical difficulties are: Polyamide 66 is hydrophilic and contains a large number of amide groups in its molecular chain, making it easy to form hydrogen bonds with water molecules. Under dyeing conditions, the fiber surface carries a positive charge, thus it readily combines with anionic acid dyes through ionic bonds, making it the easiest of the three to dye.

[0022] Shrink-resistant wool is a protein fiber whose surface is covered by a hydrophobic scale layer, forming a natural barrier to the diffusion of dye into the interior. After shrink-resistant treatment, the scale structure is softened but still exists. Its molecules contain both amino and carboxyl groups, exhibiting amphoteric properties; therefore, the dyeing process requires precise control of parameters such as pH value.

[0023] Thermoplastic polyurethane fibers are highly hydrophobic, and their molecular structure lacks reactive groups (such as ionic groups or reactive functional groups) that are easy to combine with conventional dyes. The main difficulty in dyeing them lies in the fact that dye molecules are difficult to wet or penetrate and remain firmly inside the fiber, making them the most difficult component to color in traditional dyeing processes.

[0024] The three types of fibers have different adsorption rates and equilibrium dyeing amounts for dyes, which can easily lead to uneven coloring and color difference.

[0025] For example, in com-bath staining, the following may occur: For light colors: Polyamide 66 has a darker color, anti-shrink wool has a lighter color, and thermoplastic polyurethane fiber is basically undyed. When the color is dark: the color of the anti-shrink wool gradually darkens, exceeding that of polyamide 66, and the fabric surface becomes severely "twisted"; Thermoplastic polyurethane fibers hardly participate in dye absorption, resulting in overall color difference.

[0026] (2) The specific technical means to solve the technical difficulties are: This invention reduces the surface energy of fibers and improves hydrophilicity by using a refining emulsifier containing fatty alcohol polyethoxylate, which helps thermoplastic polyurethane fibers form a wetting layer on the surface of polyamide 66, creating conditions for dye adsorption.

[0027] Reactive dye leveling agents can control dye diffusion, slow down the dyeing speed of polyamide 66, and prevent excessively rapid dyeing. Acid dye leveling agents regulate the dyeing speed of shrink-resistant wool through complexation effect and promote color uniformity. During the dyeing process, the directional cross-linking agent undergoes weak cross-linking with the amide or carboxyl groups of shrink-resistant wool and polyamide 66, acting as a "rate buffer" to reduce saturation differences.

[0028] The linear block silicone and ternary block silicone in treatment solution B act on the three components of the fabric respectively, improving the overall softness and dimensional stability of the fabric and reducing unevenness of the fabric surface caused by the difference in shrinkage rate of different fibers.

[0029] Block cationic leveling agents can also be used to replace reactive dye leveling agents and acid dye leveling agents. These block cationic leveling agents have an amphiphilic backbone with a fatty alcohol-polyethylene glycol-polypropylene glycol block structure and also incorporate terminal quaternary ammonium cationic groups (3-chloro-2-hydroxypropyltrimethylammonium chloride). This leveling agent exhibits good water solubility, interface regulation, and fiber-selective adsorption capacity. It can directionally bind to the surface of polar fibers through electrostatic interactions, thereby forming a stable hydrophilic protective layer on the surface of polyamide 66 and thermoplastic polyurethane fibers, reducing the dyeing rate and preventing color difference problems caused by dyeing rate imbalance.

[0030] 2. The fabric of the present invention is a multi-component composite, specifically a composite fabric obtained by interweaving or blending polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fiber.

[0031] Shrink-resistant wool provides natural warmth and moisture absorption, regulating skin humidity and preventing odors; polyamide 66 enhances the fabric's crispness and reduces the wool's tendency to felt. Compared to pure wool, fabrics interwoven or blended with shrink-resistant wool and polyamide 66 are more resistant to pilling, have lower shrinkage rates, are easier to care for, and greatly improve their ease of maintenance.

[0032] Thermoplastic polyurethane fiber can enhance the wearability and comfort of fabrics. Thermoplastic polyurethane fiber can be shaped to the expected size and specifications at low temperatures and is very stable. It has energy-saving advantages and can reduce the problem of shrinkage and yellowing of wool when pre-dyeing at high temperatures. It can also reduce the bleaching process before dyeing, shorten the process, and reduce energy consumption.

[0033] 3. Blended or interwoven fabrics are lightweight and soft, breathable, and comfortable to wear against the skin. They have broad market demand, especially in high-end apparel brands, and are also suitable for sports, business, and leisure applications. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below in conjunction with specific embodiments. Unless otherwise specified, the methods described are conventional methods, and the raw materials described are all available from publicly available commercial sources.

[0035] Information on some of the raw materials used is as follows: The manufacturer of polyamide 66 is Hengjie, the manufacturer of anti-shrink wool is Dezhou Huayuan, and the manufacturer of thermoplastic polyurethane fiber is Qingdao Xinwei.

[0036] Example 1 Preparation of block cationic leveling agents: 1. Prepare the reaction raw materials: Polyethylene glycol, molecular weight 1000.

[0037] Polypropylene glycol, molecular weight 1500.

[0038] Fatty alcohols: C12-14 straight-chain fatty alcohols.

[0039] Catalyst: Triethylamine.

[0040] 3-Chloro-2-hydroxypropyltrimethylammonium chloride: 3-Chloro-2-hydroxypropyltrimethylammonium chloride.

[0041] 2. The specific steps for preparing a block cationic leveling agent using reaction raw materials are as follows: In a reaction vessel, 0.3 mol of fatty alcohol, 1 mol of polyethylene glycol, and 0.67 mol of polypropylene glycol were added and mixed with 1000 g of isopropanol. The mixture was heated to 90°C, mixed, and dissolved. Then, the temperature was lowered to 70°C, and 1.5 mol of catalyst was added and stirred for 1 hour. The temperature was then lowered to 60°C, and 1.5 mol of 3-chloro-2-hydroxypropyltrimethylammonium chloride was slowly added dropwise. After the addition was complete, the reaction was maintained at 70°C for another 4 hours. After terminating the reaction, the mixture was cooled to room temperature. The mixture was purified by precipitation with acetone and dried under vacuum to obtain the desired block-type cationic leveling agent. The block-type cationic leveling agent has a pH of 6.0, an HLB value of approximately 13-14, and is readily soluble in water and dye liquor.

[0042] It should be noted that the block-type cationic leveling agent prepared in Example 1 has an amphiphilic block structure of fatty alcohol-polyethylene glycol-polypropylene glycol. Its structure connects hydrophilic and hydrophobic segments through ether bonds, thereby possessing the ability to "bridge" between polar and non-polar fiber interfaces.

[0043] The hydrophobic tail chain is composed of polypropylene glycol and C12-14 linear fatty alcohols. This structure allows it to bond with hydrophobic fiber surfaces (such as polyamide 66, the non-polar portion of polyurethane fibers) through hydrophobic interactions.

[0044] The hydrophilic head group is composed of polyethylene glycol and 3-chloro-2-hydroxypropyltrimethylammonium chloride. The polyethylene glycol segments provide hydration capacity and steric hindrance, while the cationic group imparts positive charge.

[0045] Method 1 1. The raw materials for the low-energy, short-process, same-color dyeing and finishing of fabrics are as follows: The components of the composite fabric are: polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fiber.

[0046] Composite fabrics are obtained by interweaving or blending polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fibers.

[0047] Treatment solution A: Each liter contains 0.5g-5.0g of refining emulsifier; wherein the refining emulsifier includes fatty alcohols and polyethoxylated alcohols.

[0048] Dye liquor: Each liter contains 0.5g-4.0g reactive dye leveling agent, 0.5g-4.0g acid dye leveling agent, 4.0g-10.0g directional crosslinking agent, 2.0g-10.0g reactive dye, and 0.5g-3.5g acid dye.

[0049] Alternatively, block-type cationic leveling agents can be used instead of reactive dye leveling agents and acid dye leveling agents.

[0050] Among them, the main component of reactive dye leveling agent is a surfactant complex, including a condensate of fatty alcohol and ethylene oxide. The main component of acid dye leveling agents is polyethylene glycol ether; The main component of directional crosslinking agents is inorganic salt; The main component of reactive dyes is azo reactive dyes with a dual reactive group structure; Acid dyes are acid dyes with a 1:2 metal complex structure.

[0051] Treatment solution B: Each liter contains 5-20 g / L of a smooth and durable softener and 5-20 g / L of a wool smoothing softener. The main component of the smooth and durable softener is linear block silicone; the main component of the wool smoothing softener is ternary block copolymer silicone.

[0052] 2. Using the above raw materials, the process for low-energy, short-process, same-color dyeing and finishing of fabrics is as follows: The fabric is immersed in treatment solution A and pre-shaped at a temperature of 105℃-125℃. The pre-shaped speed is set to 18-24 yards / min to obtain the pre-shaped fabric.

[0053] The pre-shaped fabric is immersed in a dye bath with a pH of 6.0-8.0 and treated at a temperature of 80℃-110℃ for 30-90 minutes to obtain the dyed fabric.

[0054] The dyed fabric is washed at 60℃-80℃ for 10-30 minutes, with a pH of 8.0-8.5. After washing, it is neutralized in acid at 20℃-40℃ for 10-30 minutes to obtain a neutralized fabric.

[0055] The neutralized fabric is then dehydrated to obtain the dehydrated fabric.

[0056] The dehydrated fabric is impregnated with treatment solution B, and then baked at 100℃-130℃ at a speed of 16-24 yards / min for shaping.

[0057] Referring to Method 1, specific implementation examples 2-6 are carried out.

[0058] Example 2 The specific steps of the low-energy, short-process, same-color dyeing and finishing process for fabrics are as follows: The fabric is immersed in treatment solution A at 80°C and pre-shaped at 110°C. The pre-shaped speed is set to 18 yards / min to obtain the pre-shaped fabric.

[0059] The pre-shaped fabric is immersed in a dye bath with a pH of 6.88 and treated at 98°C for 40 minutes to obtain the dyed fabric.

[0060] The dyed fabric was washed with a weak alkali at 80℃ for 20 minutes, resulting in a pH of 8.0. After washing, it was neutralized with acid at 40℃ for 10 minutes to obtain a neutralized fabric.

[0061] The neutralized fabric is then dehydrated to obtain the dehydrated fabric.

[0062] The dehydrated fabric is impregnated with treatment solution B, and then baked at 115°C at a speed of 16 yards / min to obtain the dyed and finished fabric.

[0063] The raw material information in this embodiment is as follows: (1) Fabric: The composite fabric is an elastic knitted fabric interwoven with 50% polyamide 66, 28% shrink-resistant wool, and 22% thermoplastic polyurethane fibers. Here, % means weight percentage, that is, the proportion of the dry weight of each fiber to the total weight. The same applies thereafter, and will not be repeated.

[0064] (2) Treatment liquid A: Each liter contains 2.0g of refining emulsifier; the refining emulsifier is CRUISEA OPX 01 produced by Shanghai Xuanli Chemical Co., Ltd., whose main component is fatty alcohol polyethoxylate.

[0065] (3) Dye liquor: Each liter contains 2.0g reactive dye leveling agent, 1.0g acid dye leveling agent, 7.0g directional crosslinking agent, 3.3g reactive dye, and 1.0g acid dye.

[0066] Among them, the reactive dye leveling agent is Kelaoyun B produced by Shanghai Xingerkang Chemical Co., Ltd., whose main component is a complex of various surfactants, mainly composed of fatty alcohols and ethylene oxide condensates. The acid dye leveling agent is NH produced by Angco Chemical (China) Co., Ltd., and its main component is polyethylene glycol ether; The directional crosslinking agent is Anmeibao N, produced by Shanghai Xingerkang Chemical Co., Ltd., and its main component is inorganic salt. The reactive dyes are three types of dyes produced by Shanghai Xingerkang Chemical Co., Ltd.: reactive golden yellow dye N-2R, reactive red dye NG, and reactive black dye NR.

[0067] The acid dye is an acid dye with a 1:2 metal complex structure. The selected acid black is Moderacid Black ACE produced by Ningbo Modern Fine Chemical Co., Ltd.

[0068] The blending ratio of reactive dyes and acid dyes is 0.1% reactive golden yellow dye N-2R, 0.2% reactive red dye NG, 3.0% reactive black dye NR, and 1.0% acid black Moderacid Black ACE.

[0069] (4) The weak alkali washing uses an aqueous solution containing 0.1g of soda ash per liter, and the acid neutralization uses an aqueous solution containing 0.4g of citric acid per liter.

[0070] (5) Treatment solution B: Each liter contains 10 g / L of fine and durable softener and 10 g / L of wool smoothing softener. Among them, the fine and durable softener is A1186 2069 produced by Shanghai Qifang Chemical Technology Co., Ltd., and its main component is linear block silicone. The wool smoothing and softening agent is 2039, produced by Shanghai Qifang Chemical Technology Co., Ltd., and its main component is ternary block copolymer organosilicon.

[0071] Example 3 Unlike Example 2, the fabric and raw materials are different, as detailed below: Fabric: The composite fabric is an elastic knitted fabric interwoven with 45% polyamide 66, 30% shrink-resistant wool, and 25% thermoplastic polyurethane fibers.

[0072] The blending ratio of reactive dyes and acid dyes is 0.15% reactive golden yellow dye N-2R, 0.22% reactive red dye NG, 3.5% reactive black dye NR, and 0.9% acid black Moderacid Black ACE.

[0073] The rest is the same as in Example 1.

[0074] Example 4 Unlike Example 2, the fabric and raw materials are different, as detailed below: Fabric: The composite fabric is an elastic knitted fabric interwoven with 60% polyamide 66, 25% shrink-resistant wool, and 15% thermoplastic polyurethane fibers.

[0075] Reactive dye is a type of reactive black dye, NR, produced by Shanghai Xingerkang Chemical Co., Ltd.

[0076] The blending ratio of reactive dye and acid dye is 2.5% reactive black dye NR and 1.5% acid black Moderacid Black ACE.

[0077] The rest is the same as in Example 1.

[0078] Example 5 Unlike Example 2, the fabric and raw materials are different, as detailed below: Fabric: The composite fabric is an elastic knitted fabric interwoven with 40% polyamide 66, 40% shrink-resistant wool, and 20% thermoplastic polyurethane fibers.

[0079] The reactive dyes are two types of dyes produced by Shanghai Xingerkang Chemical Co., Ltd.: reactive golden yellow dye N-2R and reactive black dye NR.

[0080] The blending ratio of reactive dye and acid dye is 0.25% reactive golden yellow dye N-2R, 3.5% reactive black dye NR, and 1.8% acid black Moderacid Black ACE.

[0081] The rest is the same as in Example 1.

[0082] Example 6 Unlike Example 2, a different dye solution was used. That is: (3) Dye solution: Each liter contains 3.0g block cationic leveling agent, 7.0g directional crosslinking agent, 3.3g reactive dye and 1.0g acid dye.

[0083] The block-type cationic leveling agent was prepared in Example 1.

[0084] The rest is the same as in Example 2.

[0085] Testing: Extract the three component yarns from the fabrics dyed and finished in Examples 2-6. The extraction amount should be determined using a Datacolor 1050 small aperture colorimeter. Use the best-dyeing anti-shrinkage wool as the standard sample. A color difference value within 1.0 indicates good color uniformity. The test results are shown in Tables 1-5.

[0086] Table 1

[0087] Table 2

[0088] Table 3

[0089] Table 4

[0090] Table 5

[0091] The process of this invention enables the dyeing of three components with significantly different physicochemical properties (polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fiber) in the same dye bath, while ensuring high color uniformity, low energy consumption, and a short process flow.

[0092] In Example 2, the leveling agent effectively suppressed the excessively rapid dyeing of polyamide 66, but the thermoplastic polyurethane fiber still exhibited a certain lag, becoming the main source of color difference.

[0093] In Example 3, the proportion of shrink-resistant wool in the fabric increased, and the overall balance improved. However, the deviation of polyamide 66 increased, indicating that the leveling agent has limited inhibitory power under high wool content conditions.

[0094] In Example 4, the proportion of thermoplastic polyurethane fiber was reduced, and a "black + black" compound (reactive black dye NR and acid black Moderacid Black ACE) was used to avoid interference from different rates of multi-color dyes, so that the three components could achieve the best color homogeneity.

[0095] In Example 5, the fabric had the highest proportion of shrink-resistant wool, the dye formula was mainly black, the effects of leveling agent and crosslinking agent were amplified, and the color difference of the three was less than 0.5, resulting in excellent performance.

[0096] In Example 6, the block-type cationic leveling agent forms a hydration shell at the interface between thermoplastic polyurethane fiber and polyamide 66, which can improve the ability to adjust the affinity difference and performs the best.

[0097] As can be seen from Example 6, the block-type cationic leveling agent prepared in Example 1 has better performance.

[0098] For block-type cationic leveling agents, the hydrophilic segments of polyethylene glycol are polar and can be adsorbed onto the surface of highly polar polyamide 66 or thermoplastic polyurethane fibers via hydrogen bonds; polypropylene glycol can improve its dispersion stability near non-polar dye molecules; C12-14 linear fatty alcohol end capping can enhance the material's dispersion ability in the dye bath and its hydrophobic adsorption ability with fibers; 3-chloro-2-hydroxypropyltrimethylammonium salt, with quaternary ammonium cationic groups at the molecular end, further enhances the charge adsorption on the negatively charged groups on the surface of polyamide 66 or thermoplastic polyurethane fibers.

[0099] Therefore, this leveling agent can preferentially adsorb onto the surface of polyamide 66 and thermoplastic polyurethane fibers, forming a hydrophilic protective layer on their surface to slow down the rapid diffusion and fixation of dye molecules. By forming differentiated adsorption barriers on different fibers, this leveling agent actively creates a time difference in dyeing, thereby achieving a dynamic dyeing balance of the three components (polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fiber) in the same dye bath.

[0100] In summary, this invention achieves a dynamic balance between different dyeing rates and saturations of the three-component fibers through synergistic leveling agents, buffering with directional crosslinking agents, and surface activation treatment. Simultaneously, it combines acid neutralization and softening setting to ensure fabric hand feel and dimensional stability.

[0101] In summary, the specific embodiments and comparative examples described above are merely for clearly illustrating the present invention and should not be construed as limiting the present invention. Those skilled in the art should understand that various equivalent substitutions, modifications, changes, or improvements can be made to the technical solutions and implementation methods of the present invention without departing from the spirit and scope of the invention, and all such changes or improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A low-energy, short-process, same-color dyeing and finishing process for fabrics, characterized in that, Includes the following steps: The fabric is immersed in treatment solution A and pre-shaped to obtain a pre-shaped fabric. The pre-shaped fabric is immersed in the dye solution to obtain the dyed fabric. The dyed fabric is washed and neutralized with acid to obtain a neutralized fabric. The neutralized fabric is then dehydrated to obtain the dehydrated fabric. The dehydrated fabric is immersed in padding solution B, and then baked and shaped to obtain the dyed and finished fabric.

2. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, The pre-set temperature is 105℃-125℃, and the pre-set speed is 18-24 yards / min.

3. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, The parameters for immersing the pre-shaped fabric in the dye bath include: pH 6.0-8.0, and treatment at 80℃-110℃ for 30-90 minutes.

4. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, The cleaning parameters include: cleaning at 60℃-80℃ for 10-30 minutes, with a pH of 8.0-8.

5.

5. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, The parameters for acid neutralization include: neutralizing acid at 20℃-40℃ for 10min-30min.

6. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, The baking and setting parameters include baking and setting at 100℃-130℃ at a speed of 16-24 yards / min.

7. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, The fabric is made by interweaving or blending polyamide 66, shrink-resistant wool, and thermoplastic polyurethane fibers.

8. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, Each liter of treatment solution A contains 0.5g-5.0g of scouring emulsifier, which includes fatty alcohol polyethoxylated alcohol; each liter of treatment solution B contains: 5-20g / L of fine and durable softener and 5-20g / L of wool smoothing softener; wherein, the fine and durable softener includes linear block silicone; and the wool smoothing softener includes ternary block copolymer silicone.

9. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, Each liter of dye liquor contains: 0.5g-4.0g reactive dye leveling agent, 0.5g-4.0g acid dye leveling agent, 4.0g-10.0g directional crosslinking agent, 2.0g-10.0g reactive dye, and 0.5g-3.5g acid dye; wherein, the reactive dye leveling agent includes a condensation product of fatty alcohol and ethylene oxide, the acid dye leveling agent includes polyethylene glycol ether, the directional crosslinking agent includes inorganic salt, the reactive dye includes a di-reactive azo structure reactive dye, and the acid dye includes a 1:2 metal complex structure acid dye.

10. The process for low-energy consumption, short-process, same-color dyeing and finishing of fabrics according to claim 1, characterized in that, Each liter of dye liquor contains: 0.5g-4.0g of block cationic leveling agent, 4.0g-10.0g of directional crosslinking agent, 2.0g-10.0g of reactive dye, and 0.5g-3.5g of acid dye; wherein, the preparation method of the block cationic leveling agent includes the following steps: Fatty alcohol, polyethylene glycol, polypropylene glycol and isopropanol are mixed and heated to 85-95℃ to mix and dissolve. Then the temperature is lowered to 65-75℃, and a catalyst is added and stirred. The temperature is lowered to 55-65℃, and 3-chloro-2-hydroxypropyltrimethylammonium chloride is slowly added dropwise. After the addition is complete, the reaction is continued at 765-75℃. After the reaction is terminated, the mixture is cooled. The mixture is then purified by precipitation and dried under vacuum to obtain a block-type cationic leveling agent.

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