A composite modification treatment method of high moisture-resistant color fastness high water-absorption cotton yarn

Abstract

This invention discloses a composite modification method for cotton yarn with high wet rubbing fastness and high absorbency, specifically relating to the field of textile printing and dyeing technology. The method includes cationic pretreatment: immersing the dyed and soaped cotton yarn in a treatment solution containing a cationic modifier, wherein the cationic modifier is 3-chloro-2-hydroxypropyltrimethylammonium chloride, used at 2-5% of the yarn weight, and sodium hydroxide at 2-5 g / L. This invention utilizes a three-step composite process of cationization, color fixing, and sulfonation to construct a functional gradient structure on the surface of the cotton fiber, simultaneously improving wet rubbing fastness and absorbency. CHPTAC introduces cationic anchoring sites, the GS epoxy groups of the color fixing agent partially open to form covalent bonds, enhancing the film bonding force, polyether-modified silicone oil solves the water-blocking defects of the polyurethane film, and nano-silica deposition constructs a porous hydrophilic layer. The multi-component sequential synergistic effect overcomes the contradiction between color fastness and hydrophilicity in traditional technologies, achieving a balance of color fixing, hydrophilicity, and durability.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing technology, and more specifically, to a composite modification treatment method for highly absorbent cotton yarn with high wet rubbing fastness. Background Technology

[0002] Cotton fiber, as a natural cellulose fiber, is widely used in the textile industry due to its excellent moisture absorption, breathability, and wearing comfort. However, for dark-colored cotton yarn products, especially dark black varieties, the wet rubbing color fastness has long been a technical bottleneck. The main reason is that after soaping, some unwashed black dyes aggregate and adsorb onto the surface of the cotton fibers. These dyes do not form stable ionic bonds with the hydroxyl groups of the cotton fibers, resulting in weak adhesion. In a dry state, these aggregated dyes are relatively stable; however, in a wet state, they are easily detached from the fiber surface under external friction, leading to generally low wet rubbing color fastness for dark black.

[0003] Currently, there are two main approaches to solving this technical problem: one is to remove the loose dye through multiple washes, but this will cause dark colors to become noticeably lighter, which is unacceptable to customers; the other is to add a color-fixing agent, which uses polyurethane color-fixing agents to form a protective film on the fiber surface, which can improve the wet rubbing color fastness to about level 3; however, polyurethane color-fixing agents themselves do not absorb water and will form a coating film on the outer layer of cotton fibers, further hindering the water absorption of cotton fibers and affecting the performance of wearing them. Even if hydrophilic groups are introduced into the color-fixing agent, the effect is limited because it is not resistant to washing, and the water absorption performance of cotton fibers will decrease significantly after a few washes.

[0004] Therefore, there is an irreconcilable contradiction between improving wet rubbing color fastness and improving water absorption in the existing technology. The two usually have an inverse relationship and cannot be achieved at the same time. There is an urgent need for a cotton yarn treatment technology that can improve both wet rubbing color fastness and water absorption, and has good durability. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for composite modification of highly absorbent cotton yarn with high wet rubbing fastness, comprising the following steps: S1. Cationic pretreatment: The dyed and soaped cotton yarn is immersed in a treatment solution containing a cationic modifier, wherein the cationic modifier is 3-chloro-2-hydroxypropyltrimethylammonium chloride, the dosage is 2-5% based on the weight of the yarn, sodium hydroxide is 2-5 g / L, the treatment temperature is 80-90℃, and the treatment time is 20-40 minutes, so that quaternary ammonium cationic groups are introduced into the cotton fiber. S2. Fixing agent curing treatment: The pre-treated cationic yarn is transferred to a winding machine, and a fixing working solution is applied through a liquid roller at a speed of 5 rpm and a main speed of 400-500 m / min. The fixing working solution contains: 8-12% fixing agent GS, 6-10 g / L citric acid, and 0.5-2% polyether modified silicone oil based on the weight of the yarn. Then, it is dried at a constant temperature of 90-100℃ for 20-30 minutes to complete the film-forming curing of the fixing agent and the partial ring-opening reaction of the epoxy groups. S3. Sulfonated Nanocomposite Treatment: After curing, the yarn is loosened again and fed into the dyeing vat. A sulfonated nanocomposite treatment solution is added, which contains: 3-5% sodium dodecyl sulfonate, 1-3% polyether polyol, 1-2% glycerol, 1-3% nano silica sol, 0.5-2% hydroxypropyl-β-cyclodextrin, and 0.5-2% crosslinking agent based on the weight of the yarn. Heat to 50-70℃, add 0.5-1.5% soda ash and 0.05-0.2% alkyl zinc salt based on the weight of the yarn, and keep warm for 10-20 minutes; Heat to 90-100℃ and hold for 20-40 minutes to allow sodium dodecyl sulfonate to bind with cationic groups through ionic bonds and adsorb onto the surface of cotton fibers and color-fixing film. At the same time, nano-silica is deposited on the fiber surface to form a porous hydrophilic modified layer, which drains water. S4. Pickling and setting: Heat to 90-100℃, add 3-5g / L of citric acid, keep warm for 10-15 minutes, drain, dehydrate and dry, and then roll into a cylinder for shaping.

[0007] Preferably, the treatment solution in the cation pretreatment step further contains 1-2 g / L of tartaric acid to promote the reaction between 3-chloro-2-hydroxypropyltrimethylammonium chloride and the hydroxyl groups of cotton fibers.

[0008] Preferably, the particle size of the nano-silica sol is 10-30 nm, and its surface is modified with a silane coupling agent, wherein the silane coupling agent is γ-glycidoxypropyltrimethoxysilane, and the amount used is 5-10% of the mass of the nano-silica.

[0009] Preferably, the hydroxypropyl-β-cyclodextrin in the sulfonated nanocomposite treatment solution is used to encapsulate free dye molecules that have not formed ionic bonds with the fiber, and its outer wall hydroxyl groups form a hydrogen bond network with glycerol and polyether polyol.

[0010] Preferably, the polyether-modified silicone oil has a molecular structure in which polyoxyethylene segments account for 60-80%, polydimethylsiloxane segments account for 20-40%, and a number-average molecular weight of 8000-15000.

[0011] Preferably, the crosslinking agent is a complex of citric acid and tartaric acid in a mass ratio of 1:0.3-0.5. The alkyl zinc salt promotes the coordination bonding between the silanol groups on the surface of nano-silica and the hydroxyl groups on the surface of the color-fixing film and the fiber. Citric acid and tartaric acid assist in the construction of a hydrogen bond network.

[0012] Preferably, the cotton yarn includes pure cotton yarn, acrylic-cotton blended yarn with a cotton content of not less than 60%, or polyester-cotton blended yarn.

[0013] Preferably, the fixing agent GS is a quaternary ammonium cationic polyurethane fixing agent, whose molecular chain contains quaternary ammonium cationic groups and reactive epoxy groups. The reactive epoxy groups undergo a partial ring-opening reaction with the hydroxyl groups of cotton fibers under citric acid catalysis at 90-100℃, thereby enhancing the bonding force between the fixing film layer and the fiber.

[0014] Preferably, the alkyl zinc salt is selected from zinc acetate, zinc stearate, zinc octanoate, or zinc dodecylbenzenesulfonate.

[0015] The technical effects and advantages of this invention are as follows: By employing a three-step composite treatment process of cationization, color fixation, and sulfonation, a unique functional gradient structure is constructed on the surface of cotton fibers. This successfully solves the long-standing technical problem in the textile industry where wet rubbing color fastness and water absorption performance are contradictory. The process involves introducing quaternary ammonium cationic groups in step S1, constructing a polyurethane color-fixing film layer containing polyether-modified silicone oil in step S2, and depositing a porous hydrophilic modified layer of nano-silica in step S3. The three functional layers are synergistically combined through chemical bonds and physical interactions, enabling the treated cotton yarn to simultaneously improve both wet rubbing color fastness and water absorption performance. Furthermore, the performance retention rate is high after multiple standard washes, breaking through the bottleneck of the traditional technology where the two properties are mutually exclusive. The cationization pretreatment provides anchoring sites for subsequent anionic components. The reactive epoxy groups in the fixing agent GS undergo partial ring-opening reactions under acidic high-temperature conditions, forming covalent bonds with the fibers to enhance the film adhesion. The polyoxyethylene segments of the polyether-modified silicone oil are hydrophilic towards the inside of the film, while the polydimethylsiloxane segments provide flexibility outward, solving the problem of the dense water-blocking defects of traditional polyurethane films. Sodium dodecyl sulfonate is electrostatically bonded to cationic groups through ionic bonds. Nano-silica is deposited on the fiber surface through coordination bonding under the promotion of alkyl zinc salt. Hydroxypropyl-β-cyclodextrin encapsulates free dye molecules and constructs a hydrogen bond network. The above-mentioned multiple components act sequentially in the time dimension, are distributed in a gradient in the spatial dimension, and are chemically bonded in a multi-dimensional way, forming a triple functional balance of color fixation, hydrophilicity, and durability that cannot be achieved by traditional single-processing methods. By employing a four-step synergistic process—cationization pretreatment, color-fixing agent curing, sulfonation nanocomposite treatment, and acid washing and setting—and through precise timing control of temperature, pH, and components, the orderly construction of each functional layer is achieved. The process parameters have a wide range and strong operability, making it suitable for various cotton blended yarns such as pure cotton, acrylic cotton, and polyester cotton. Moreover, all raw materials are commercially available conventional products, requiring no special equipment investment, and it is feasible for large-scale industrial production. At the same time, the cotton yarn treated by this invention has stable performance and good durability, and can be widely used in high-end clothing, home textiles, and other fields, with significant economic and social benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the method flow structure of the present invention. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Preparation of modified nano-silica sol: 10g of nano-silica with a particle size of 20nm was dispersed in 100mL of deionized water and sonicated for 30 minutes. 0.8g of KH-560 was added, and the pH was adjusted to 4.5 with acetic acid. The mixture was stirred at 60℃ for 4 hours. The mixture was centrifuged at 8000rpm for 20 minutes to remove unreacted substances. The supernatant was the modified nano-silica sol with a solid content of 10%.

[0019] Sodium dodecyl sulfonate was purchased from Shanghai Yujing; polyether polyol was purchased from Shanghai Yujing.

[0020] Example 1: Center parameter processing of pure cotton yarn This embodiment provides a method for color-fixing and hydrophilic composite treatment of pure cotton yarn, specification 40S / 2, 100% pure cotton, specifically including the following steps: S1. Cationic pretreatment: Immerse the pure cotton yarn dyed with reactive dyes and soaped in the treatment solution with a liquid-to-bath ratio of 1:15. The treatment solution contains: 3% CHPTAC, 3g / L sodium hydroxide, and 1.5g / L tartaric acid based on the yarn weight. Heat to 85℃ and keep warm for 30 minutes to introduce quaternary ammonium cationic groups into the cotton fibers. After treatment, wash twice with water at room temperature for 5 minutes each time, and dehydrate for later use.

[0021] S2. Fixing agent curing treatment: Transfer the pretreated yarn to the winding machine and apply the fixing working solution through the liquid roller; set the liquid roller speed to 5 rpm, the main speed to 450 m / min, and control the roll-off rate to about 65%; the fixing working solution contains: 10% fixing agent GS based on yarn weight, 8 g / L citric acid, and 1.2% polyether modified silicone oil; after application, dry the yarn in a 95℃ constant temperature oven for 25 minutes. At this time, the reactive epoxy groups on the fixing agent GS molecular chain undergo a partial ring-opening reaction under acidic and high temperature conditions, forming covalent bonds with the hydroxyl groups on the surface of the cotton fiber, completing the initial film formation and anchoring of the fixing agent on the fiber surface.

[0022] S3. Sulfonation Nanocomposite Treatment: The cured yarn is loosely placed into the dyeing vat, and a sulfonation nanocomposite treatment solution is added at a liquid-to-bath ratio of 1:20. The treatment solution contains: 4% sodium dodecyl sulfonate, 2% polyether polyol, 1.5% glycerol, 2% modified nano-silica sol, 1% HP-β-CD, and 1.5% crosslinking agent based on yarn weight. The crosslinking agent has a citric acid:tartaric acid mass ratio of 1:0.4, and the modified nano-silica sol has a solid content of 10%. The temperature is increased to 60℃ at 2℃ / min, and 1% soda ash and 0.1% zinc acetate based on yarn weight are added. The solution is kept at this temperature for 15 minutes; then the temperature is increased to 95℃ at a rate of 1.5℃ / min and kept at this temperature for 30 minutes. During this process, sodium dodecyl sulfonate binds to the cationic groups introduced in step S1 through electrostatic attraction and adsorbs onto the surface of the fiber and the fixing film. At the same time, under the promoting and coordinating effect of zinc acetate, the silanol groups on the surface of nano silica form stable coordination bonds with the hydroxyl groups on the surface of the fixing film and the fiber. Combined with the hydrogen bond network constructed with the assistance of citric acid and tartaric acid, nano silica is uniformly deposited on the fiber surface to form a porous hydrophilic modified layer. After the reaction is completed, the solution is drained and washed with hot water at 60℃ for 5 minutes.

[0023] S4. Acid washing and setting: Add clean water to the dyeing vat. Liquid bath ratio 1:15; heat to 95℃, add 4g / L of citric acid, keep warm for 12 minutes to neutralize residual alkali and stabilize the cross-linking structure, then drain; the yarn is centrifuged at 800rpm for 3 minutes, then dried in hot air at 80℃ for 20 minutes, and finally shaped into rolls.

[0024] Example 2: Low-speed end treatment of polyester-cotton blended yarn This embodiment aims to verify the applicability of the present invention under the lower limit speed of equipment operation and under specific alkyl zinc salt conditions. The object of treatment is polyester-cotton blended yarn, specification 45S / 2, cotton content 65%, polyester 35%.

[0025] S1. Cationic pretreatment: The treatment solution contains 2% CHPTAC, 2g / L sodium hydroxide, and 1g / L tartaric acid based on the yarn weight. The solution is kept at 80℃ for 40 minutes and then washed and dehydrated.

[0026] S2. Curing treatment with fixing agent: The main speed of the winding machine is set to 400m / min, and the speed of the liquid wheel is 5 rpm; the fixing working solution contains 8% GS fixing agent based on the yarn weight, 6g / L citric acid, and 0.5% polyether modified silicone oil; dry at 90℃ for 30 minutes.

[0027] S3. Sulfonated Nanocomposite Treatment: The treatment solution contains 3% sodium dodecyl sulfonate, 1% polyether polyol, 1% glycerol, 1% modified nano-silica sol, 0.5% HP-β-CD, and 0.5% crosslinking agent (citric acid:tartaric acid = 1:0.3, based on yarn weight). Heat to 50°C, add 0.5% soda ash and 0.05% zinc dodecylbenzenesulfonate, and maintain this temperature for 20 minutes. Then heat to 90°C and maintain this temperature for 40 minutes. Drain and wash with hot water.

[0028] S4. Pickling and shaping: Treat with 3g / L citric acid at 90℃ for 15 minutes, dehydrate and dry at 80℃, then invert and shape.

[0029] Example 3: High-speed and high-concentration end-point treatment of acrylic-cotton blended yarns This embodiment aims to verify the extreme process applicability of the present invention under conditions of high equipment speed, high fixing agent concentration and different zinc salts. The object of treatment is acrylic cotton blended yarn, specification 32S, cotton content 70% and acrylic fiber 30%.

[0030] S1. Cationic pretreatment: The treatment solution contains 5% CHPTAC, 5g / L sodium hydroxide, and 2g / L tartaric acid based on the yarn weight; heat treatment at 90℃ for 20 minutes, followed by washing and dehydration.

[0031] S2. Curing treatment with fixing agent: The main speed of the winding machine is set to 500m / min, and the speed of the liquid wheel is 5 rpm; the fixing working solution contains 12% GS fixing agent, 10g / L citric acid, and 2% polyether modified silicone oil based on the yarn weight; dry at 100℃ for 20 minutes.

[0032] S3. Sulfonated Nanocomposite Treatment: The treatment solution contains 5% sodium dodecyl sulfonate, 3% polyether polyol, 2% glycerol, 3% modified nano-silica sol, 2% HP-β-CD, and 2% crosslinking agent (citric acid:tartaric acid = 1:0.5) based on yarn weight. Heat to 70℃, add 1.5% soda ash and 0.2% zinc octanoate, and maintain this temperature for 10 minutes. Then heat to 100℃ and maintain this temperature for 20 minutes. Drain and wash with hot water.

[0033] S4. Pickling and shaping: Treat with 5g / L citric acid at 100℃ for 10 minutes, dehydrate and dry at 80℃, then invert and shape.

[0034] Comparative Example 1: S1 cation pretreatment step omitted The same pure cotton yarn and subsequent process parameters as in Example 1 were used, but in step S1, only water was used to treat the sample at 85°C for 30 minutes, without adding CHPTAC, sodium hydroxide and tartaric acid. The subsequent steps S2-S4 were the same as in Example 1.

[0035] Comparative Example 2: No nano-silica sol was added to S3 Using the exact same raw materials and process parameters as in Example 1, the only difference was that the modified nano-silica sol was omitted from the sulfonation nanocomposite treatment solution in step S3, while the proportions of the other additives remained unchanged.

[0036] Comparative Example 3: No polyether-modified silicone oil was added to S2. Using the exact same raw materials and process parameters as in Example 1, the only difference was that the addition of polyether-modified silicone oil was omitted from the color-fixing working solution in step S2, while the remaining components and subsequent processes remained unchanged.

[0037] Comparative Example 4: Untreated raw yarn Pure cotton yarn, 40S / 2, 100% pure cotton, dyed with dark black reactive dye and soaped, without any S1-S4 treatment, was directly used as the reference sample for testing.

[0038] Macro performance testing The performance of the yarns treated in each embodiment and comparative example was tested according to the following standards: Color fastness to wet rubbing: Tested according to GB / T 3920-2008 "Textiles - Tests for color fastness to rubbing"; Color fastness to washing with soap: Tested according to GB / T 3921-2008 "Textiles - Tests for color fastness to washing with soap"; Capillary effect: Tested according to GB / T 22799-2019 "Textiles - Test Method for Capillary Effect", the height of liquid climb within 30 minutes; Water absorption rate: The weight gain rate was calculated by immersing 1g of yarn in 25℃ deionized water for 5 minutes, then hanging it vertically to drip naturally for 2 minutes. Durability test: The yarn was washed 10 times at 40°C according to the 4N procedure of GB / T 8629-2017 "Home washing and drying procedures for textile testing" and its capillary effect retention rate (%) was determined.

[0039] The test results are shown in Table 1 below: Table 1. Yarn performance test data for each embodiment and comparative example. 4. Results Analysis The following conclusions can be drawn from the data in Table 1: Examples 1-3 all demonstrated good color fastness, with wet rubbing and soap washing color fastness reaching grade 3 or above, and excellent hydrophilic properties, with a capillary effect exceeding 9.8 cm and a water absorption rate of over 195%. After 10 standard washes, the capillary effect retention rate was close to 90%, proving that the process parameters provided by this invention can stably achieve the invention's objectives, and that the technical solution has repeatability and industrial application value.

[0040] Comparing Example 1 with Comparative Example 1, it can be seen that if the cationic pretreatment in S1 is omitted, the number of cationic sites on the yarn surface is greatly reduced, which leads to the inability of sodium dodecyl sulfonate in S3 to be effectively adsorbed through ionic bonds. Ultimately, the effect of sulfonation nanocomposite treatment is greatly reduced, the capillary effect and water absorption rate are significantly reduced, and the synergistic promoting effect of cationization on color fixation is lost, and the color fastness is also significantly reduced.

[0041] Comparing Example 1 and Comparative Example 2, it can be seen that if nano-silica is missing in S3, an effective porous hydrophilic modification layer cannot be formed on the fiber surface, resulting in insufficient surface roughness and hydrophilic sites, and the capillary effect and water absorption rate are greatly affected. At the same time, the absence of nanoparticles also reduces the deposition firmness of the treatment liquid on the fiber surface, and the color fastness performance is mediocre.

[0042] Comparing Example 1 and Comparative Example 3, it can be seen that if polyether-modified silicone oil is omitted in S2, the color-fixing film layer is a pure polyurethane structure, which is dense and water-blocking, and the wicking capacity and water absorption rate are significantly reduced; moreover, the film layer becomes more brittle and is prone to cracking after washing, resulting in poor durability.

[0043] Comparing Example 1 and Comparative Example 4, it can be seen that the wet rubbing color fastness of the untreated dyed raw yarn is only grade 2, the capillary effect is 5.8 cm, and the water absorption rate is 120%, all of which are at a low level, confirming the significant progress of the overall technical solution of the present invention.

[0044] In summary, through the synergistic cooperation of steps S1-S4, especially the optimized combination of various process parameters within a specific range, this invention successfully achieves the simultaneous improvement of the color-fixing and hydrophilic properties of cotton yarn and enhances its durability, effectively solving the technical problem that traditional cotton yarns are difficult to achieve both color-fixing and hydrophilicity and have poor durability.

[0045] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for composite modification treatment of highly absorbent cotton yarn with high wet rubbing fastness, characterized in that, Includes the following steps: S1. Cationic pretreatment: The dyed and soaped cotton yarn is immersed in a treatment solution containing a cationic modifier, wherein the cationic modifier is 3-chloro-2-hydroxypropyltrimethylammonium chloride, the dosage is 2-5% based on the weight of the yarn, sodium hydroxide is 2-5 g / L, the treatment temperature is 80-90℃, and the treatment time is 20-40 minutes, so that quaternary ammonium cationic groups are introduced into the cotton fiber. S2. Fixing agent curing treatment: The pre-treated cationic yarn is transferred to a winding machine, and a fixing working solution is applied through a liquid roller at a speed of 5 rpm and a main speed of 400-500 m / min. The fixing working solution contains: 8-12% fixing agent GS, 6-10 g / L citric acid, and 0.5-2% polyether modified silicone oil based on the weight of the yarn. Then, it is dried at a constant temperature of 90-100℃ for 20-30 minutes to complete the film-forming curing of the fixing agent and the partial ring-opening reaction of the epoxy groups. S3. Sulfonated Nanocomposite Treatment: After curing, the yarn is loosened again and fed into the dyeing vat. A sulfonated nanocomposite treatment solution is added, which contains: 3-5% sodium dodecyl sulfonate, 1-3% polyether polyol, 1-2% glycerol, 1-3% nano silica sol, 0.5-2% hydroxypropyl-β-cyclodextrin, and 0.5-2% crosslinking agent based on the weight of the yarn. Heat to 50-70℃, add 0.5-1.5% soda ash and 0.05-0.2% alkyl zinc salt based on the weight of the yarn, and keep warm for 10-20 minutes; Heat to 90-100℃ and hold for 20-40 minutes to allow sodium dodecyl sulfonate to bind with cationic groups through ionic bonds and adsorb onto the surface of cotton fibers and color-fixing film. At the same time, nano-silica is deposited on the fiber surface to form a porous hydrophilic modified layer, which drains water. S4. Pickling and setting: Heat to 90-100℃, add 3-5g / L of citric acid, keep warm for 10-15 minutes, drain, dehydrate and dry, and then roll into a cylinder for shaping.

2. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The treatment solution in the cation pretreatment step also contains 1-2 g / L of tartaric acid to promote the reaction between 3-chloro-2-hydroxypropyltrimethylammonium chloride and the hydroxyl groups of cotton fibers.

3. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The nano-silica sol has a particle size of 10-30 nm and its surface is modified with a silane coupling agent, namely γ-glycidoxypropyltrimethoxysilane, and the amount used is 5-10% of the mass of the nano-silica.

4. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The hydroxypropyl-β-cyclodextrin is used in the sulfonated nanocomposite treatment solution to encapsulate free dye molecules that have not formed ionic bonds with the fiber, and its outer wall hydroxyl groups form a hydrogen bond network with glycerol and polyether polyol.

5. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The polyether-modified silicone oil has a molecular structure in which polyoxyethylene segments account for 60-80%, polydimethylsiloxane segments account for 20-40%, and the number average molecular weight is 8000-15000.

6. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The crosslinking agent is a complex of citric acid and tartaric acid in a mass ratio of 1:0.3-0.

5. The alkyl zinc salt promotes the coordination bonding between the silanol groups on the surface of nano-silica and the hydroxyl groups on the surface of the color-fixing film and the fiber. Citric acid and tartaric acid assist in the construction of a hydrogen bond network.

7. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The cotton yarn includes pure cotton yarn, acrylic-cotton blended yarn with a cotton content of not less than 60%, or polyester-cotton blended yarn.

8. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The fixing agent GS is a quaternary ammonium cationic polyurethane fixing agent. Its molecular chain contains quaternary ammonium cationic groups and reactive epoxy groups. The reactive epoxy groups undergo a partial ring-opening reaction with the hydroxyl groups of cotton fibers under citric acid catalysis at 90-100℃, thereby enhancing the bonding force between the fixing film layer and the fiber.

9. The composite modification treatment method for high wet rubbing fastness and high absorbency cotton yarn according to claim 1, characterized in that: The alkyl zinc salt is selected from one of zinc acetate, zinc stearate, zinc octanoate, or zinc dodecylbenzenesulfonate.

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