Wool triacetate blended fabric and preparation method thereof

Abstract

The application discloses a wool tricarboxylic acid blended fabric and a preparation method thereof, and belongs to the technical field of textile printing and dyeing. The method comprises the following steps: respectively performing normal-pressure low-temperature plasma pretreatment and specific enzyme synergistic modification on wool sliver and tricarboxylic acid short fiber sliver, moderately passivating wool scales by using protease, and promoting surface micro-deacetylation of tricarboxylic acid by using esterase or cutinase; mixing the slivers, spinning and weaving into a fabric; performing one-bath same-color dyeing by using disperse / acid dyes at 100 DEG C under normal pressure; and performing medium-low temperature heat setting. Through synergistic effect of plasma physical etching and biological enzyme chemical degradation, the technical prejudice that tricarboxylic acid needs high-temperature dyeing at 130 DEG C is broken. The method can obtain excellent same color under normal pressure, significantly improves wool strength retention rate, avoids wool heat damage and yellowing, the finished product has low shrinkage rate after machine washing, is green and environment-friendly, and is suitable for industrial popularization.

Description

Technical Field

[0001] This application relates to the textile field, and more specifically, to a wool triacetate blended fabric and a method for preparing the same. Background Technology

[0002] Triacetate fiber, derived from natural wood pulp, possesses extremely high crystallinity, endowing fabrics with excellent drape, a silky luster, outstanding wrinkle resistance, and superb thermoplastic shape retention. Wool, as a classic natural protein fiber, has a unique hydrophobic scaly layer on its surface, giving fabrics excellent warmth, moisture absorption and breathability, high elasticity, and a luxurious skeletal feel. In the high-end textile industry, blending wool and triacetate fiber aims to complement each other's strengths, developing high-value-added fabrics that combine crisp drape with warmth, comfort, and a silky touch. However, these two fibers differ significantly in their microscopic physical morphology and macroscopic chemical structure, and their direct blending faces irreconcilable physicochemical contradictions within the existing textile printing and dyeing industry system.

[0003] The most significant and insurmountable technical barrier lies in the inherent contradiction in the thermodynamic conditions of dyeing. Triacetate fibers, due to their extremely smooth surface, tightly packed macromolecules, and lack of polar hydrophilic groups, typically require disperse dyes at high temperatures and pressures of 120℃-130℃ to fully expand the fiber microstructure, thereby achieving high dye uptake and penetration rates. However, wool, as a protein fiber, has extremely poor heat resistance. Once placed in a 120℃ high-temperature dye bath, the keratin in the wool cortex undergoes irreversible thermal damage, leading to severe yellowing, brittleness, a sharp decrease in strength, and even carbonization of the fiber. Conversely, if the dyeing temperature is lowered to the ambient pressure boiling point (98℃-100℃) to protect the wool, the dye uptake and penetration rates of triacetate fibers will plummet, resulting in extremely light fabric colors, poor colorfastness, and severe staining of the wool by disperse dyes, making it extremely difficult to control the color uniformity of blended fabrics.

[0004] This significant gap in the physical and chemical properties of the fiber surface not only makes same-bath dyeing a major challenge in the industry, but also poses numerous hidden dangers in the spinning and finishing stages. In the early spinning process, the high resistivity and low coefficient of friction of triacetate fibers easily generate electrostatic repulsion and fiber migration with the rough surface of wool, resulting in uneven blending of the yarn cross-section. Even more problematic is the severe trade-off between dimensional stability and hand feel balance in the finishing stage. To fully unleash the drape and wrinkle-resistant properties of triacetate fibers, the fabric typically requires high-temperature heat setting at 180℃-190℃, which inevitably triggers yellowing and hardening of the wool, causing it to lose its original fluffiness and elasticity. Simultaneously, the directional friction effect caused by the scaly structure of the wool surface imparts potential felting to the fabric, leading to extremely unstable dimensions after washing. Using traditional chlorination anti-shrinkage processes to reduce wool felting would not only cause serious environmental pollution but also destroy the extremely precious silky feel of triacetate fibers, making the development of truly machine-washable high-end blended fabrics a paradox.

[0005] Existing technologies often only compromise by "interweaving" the two fibers after they are spun into yarns separately, or by simply mechanically mixing them. They have consistently failed to break through the physicochemical barriers between wool and triacetate fibers at the microscopic level, nor have they effectively overcome the aforementioned problems. In view of this, this application is hereby submitted. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a wool triacetate blended fabric and its preparation method.

[0007] The technical solution adopted in this application is as follows: In a first aspect, this application provides a method for preparing a wool triacetate blended fabric, comprising the following steps: S1. Wool tops and triacetate staple fiber strips are subjected to continuous low-temperature plasma pretreatment respectively; then, the pretreated wool tops and triacetate staple fiber strips are respectively sent to a specific biological enzyme bath for wet enzyme treatment; after the enzyme treatment, the enzyme is inactivated, washed with water and dried to obtain modified wool tops and modified triacetate staple fiber strips. S2. The modified wool sliver and modified triacetate staple fiber sliver are combed and blended, spun into wool triacetate blended yarn through roving and spinning processes, and woven into fabric. S3. Place the fabric at 98~105℃ under normal pressure and dye it using a one-bath dyeing method. S4. Perform heat setting treatment on the dyed fabric, with the heat setting temperature controlled at 150~160℃; In step S1, the wet enzymatic treatment of the wool strip uses a protease to damage the hydrophobic scales on the surface of the wool fiber; the wet enzymatic treatment of the triacetate staple fiber uses an esterase or a keratinase to cause a micro-deacetylation reaction on the surface of the triacetate fiber.

[0008] Preferably, the protease is Bacillus subtilis alkaline protease, which is an endopeptide with a large molecular weight. In a weakly alkaline environment of pH 7.5-8.0, it only peels and passivates the scales on the surface of wool, and does not easily penetrate the cortex to damage the fiber strength.

[0009] Preferably, the esterase is an acetylesterase, which specifically hydrolyzes the acetyl groups on the surface of triacetate cellulose, exposing the hydrophilic hydroxyl groups. The cutinase is either Fusarium solanicutinase or Thermobifida fusca cutinase. Cutinases possess the characteristics of both esterases and lipases, exhibiting strong specificity for the surface hydrolysis of insoluble acetate polymers.

[0010] Furthermore, in step S1 above, the low-temperature plasma pretreatment uses a mixture of oxygen and argon as the working gas, with a processing power of 150~250W and a processing time of 10~30 seconds; the volume ratio of oxygen to argon in the mixture is 1:(3~5).

[0011] Furthermore, in step S1 above, the conditions for wet enzymatic treatment of wool strips are: temperature 45~50℃, pH value 7.5~8.0, and treatment time 20~30 minutes; the fiber reduction rate of the treated wool strips is controlled between 2% and 4%.

[0012] Furthermore, in step S1 above, the conditions for wet enzymatic treatment of triacetic acid short fibers are: temperature 40℃~50℃, pH value 7.8~8.2, and treatment time 15~25 minutes.

[0013] Furthermore, in step S1 above, the enzyme inactivation step is: heating the treatment solution to 80~85℃ and maintaining it for more than 10 minutes.

[0014] Furthermore, in step S2 above, during the first combing process, a general-purpose antistatic oil is sprayed onto the modified wool sliver and the modified triacetate staple fiber sliver, with an application rate of 0.5% to 0.8% of the total fiber weight; and the combing process includes 3 to 4 mixing passes to ensure that the two types of fibers are evenly distributed across the yarn cross-section.

[0015] Preferably, the general-purpose antistatic oil is a compound of alkyl phosphate salts and nonionic surfactants.

[0016] Preferably, the disperse dye is a low-temperature disperse dye; the anti-staining agent is polyvinylpyrrolidone or naphthalenesulfonic acid formaldehyde condensate.

[0017] Furthermore, in step S3 above, the one-bath dyeing method uses a dyeing solution containing both disperse dye and acid dye in the same bath, and adds an anti-staining agent, and performs atmospheric pressure boiling dyeing at 98~100℃ for 45~60 minutes.

[0018] Secondly, this application provides a wool triacetate blended fabric prepared by the above preparation method, wherein the blended fabric is woven from a single blended yarn containing modified wool fibers and modified triacetate fibers. The modified wool fiber has a hydrophobic scale layer with rounded edges due to plasma etching and protease hydrolysis; the modified triacetate fiber has micropores on its surface, and its surface layer exhibits a polar hydrophilic cellulose structure due to deacetylation; and there are no yellowed wool fibers inside the fabric.

[0019] Furthermore, the above-mentioned blended fabrics possess the same color properties imparted by same-bath dyeing, the strength retention rate of wool fibers is greater than 95%, and the dimensional shrinkage rate of the fabric is less than 3%.

[0020] In summary, this application has the following beneficial effects: This invention, starting from the microscopic physicochemical structure, ingeniously utilizes the synergistic effect of low-temperature plasma pretreatment and dual-targeted bioenzymes to completely overcome the inherent contradictions between wool and triacetate fibers in the dyeing and finishing system for the first time. The etching effect of plasma not only improves the highly resistant and dense surface of triacetate fibers but also opens microscopic channels for subsequent wet enzymatic treatment. By precisely deacetyling triacetate fibers using esterases or keratinases, the surface layer is transformed into a cellulose structure with polar hydrophilic groups, miraculously reducing the high-pressure dyeing temperature of triacetate fibers to the ambient pressure boiling temperature (98℃~105℃). This breakthrough not only enables one-bath dyeing of both fibers at ambient pressure, greatly simplifying the process and significantly reducing energy consumption, but also fundamentally avoids the irreversible thermal damage and yellowing problems caused by 120℃ high temperature to wool keratin.

[0021] Furthermore, this invention also demonstrates excellent synergistic benefits in the fiber spinning and finishing stages. After targeted treatment with bio-protease, the hydrophobic scale layer on the surface of the wool fibers is moderately passivated. This not only eliminates the electrostatic migration problem in the early spinning process, ensuring yarn uniformity, but also endows the wool with durable anti-shrinkage properties without chlorine pollution. Thanks to the modification and empowerment of the pretreatment, the fabric only requires a medium-low temperature of 150℃~160℃ in the post-setting stage to achieve stable dimensional shape, avoiding the stiffness and wool brittleness caused by traditional high-temperature setting. The resulting wool triacetate blended fabric perfectly retains the high-end skeletal feel and warm elasticity of wool, while fully stimulating the unique silky touch and superior drape of triacetate fibers. The dimensional shrinkage rate after washing is less than 3%, successfully filling the technological gap in high-end "machine-washable" eco-friendly blended fabrics, possessing extremely high commercial added value and green environmental protection significance. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Specific conditions not specified in the examples shall be carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0023] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0024] Example 1 This embodiment provides a method for preparing a wool triacetate blended fabric, specifically including the following steps: S1, Synergistic modification treatment of fiber strips: (1) Plasma pretreatment: 66S worsted wool tops and triacetate staple fiber tops were continuously fed into a low-temperature plasma treatment device under normal pressure. The working gas was a mixture of oxygen and argon with a volume ratio of 1:4; the treatment power was set to 200W and the treatment time was 20 seconds.

[0025] (2) Specific biological enzyme wet treatment: After the plasma bombardment is completed, the wool strips and triacetic acid short fiber strips are immediately sent into the specific biological enzyme bath.

[0026] Among them, a high molecular weight protease, specifically Bacillus subtilis alkaline protease (Savinase 16L), is used for wool tops. The bath temperature is 48℃, the pH value is 7.8, and the treatment time is 25 minutes, which damages the hydrophobic scales on the wool surface, making the edges rounded and blunt. Acetylesterase was used to treat triacetate short fibers at a bath temperature of 45°C, a pH of 8.0, and a treatment time of 20 minutes. This process induced a micro-deacetylation reaction on the surface of the triacetate fibers, generating a polar hydrophilic cellulose structure.

[0027] (3) Enzyme inactivation and drying: The two treatment solutions were heated to 85°C and kept at 15 minutes for enzyme inactivation. After routine washing and drying, modified wool tops (the fiber reduction rate was measured to be 3.1%) and modified triacetate staple fiber tops were obtained.

[0028] S2, blended yarn: In the first combing process, the modified wool sliver and modified triacetate staple fiber sliver are mixed in a 50:50 ratio, and a general-purpose antistatic oil (specifically a compound of potassium dodecyl phosphate and fatty alcohol polyoxyethylene ether, used at 0.6% of the total fiber weight) is sprayed onto the fiber sliver. The sliver is then combed four times to ensure uniform distribution, followed by a roving process, and finally spun into a blended yarn using Sirospinning technology in the spinning process. The yarn is then woven into fabric on a shuttleless loom.

[0029] S3, One-bath staining under normal pressure: The fabric was placed in an atmospheric pressure overflow dyeing machine. Disperse Blue 56 (a disperse dye) and Acid Blue 80 (a weak acid dye) were added to the dye bath, along with polyvinylpyrrolidone as an anti-staining agent. The fabric was then dyed in a one-bath process at 100°C under atmospheric pressure for 50 minutes, followed by washing.

[0030] S4. Low-temperature post-setting: The dyed fabric is sent to a setting machine for stretching and heat setting. The heat setting temperature is controlled at 155℃ and the machine speed is 30m / min to obtain the finished wool triacetate blended fabric.

[0031] Example 2 This embodiment provides a method for preparing a wool triacetate blended fabric, which differs from Example 1 only in that: When using specific biological enzymes for wet treatment of triacetic acid short fibers, keratinase treatment is employed: specifically, Fusarium keratinase is used at a temperature of 50°C, pH 8.2, and a treatment time of 25 minutes.

[0032] Example 3 This embodiment provides a method for preparing a wool triacetate blended fabric, which differs from Example 1 only in that: During plasma pretreatment, the working gas oxygen to argon has a volume ratio of 1:5, a power of 250W, and a duration of 30 seconds.

[0033] Example 4 This embodiment provides a method for preparing a wool triacetate blended fabric, which differs from Example 1 only in that: During plasma pretreatment, the volume ratio of oxygen to argon in the plasma working gas is 1:3, the power is 150W, and the time is 10 seconds.

[0034] Example 5 This embodiment provides a method for preparing a wool triacetate blended fabric, which differs from Example 1 only in the specific bio-enzyme wet treatment: Wet enzymatic treatment of wool tops: temperature 45℃, pH 7.5, time 20 minutes.

[0035] Triacetic acid short fibers were treated with keratinase at 40°C, pH 7.8, for 15 minutes.

[0036] The enzyme inactivation conditions were maintained at 80℃ for 30 minutes.

[0037] The remaining steps and conditions are the same as in Example 1.

[0038] Example 6 This embodiment provides a method for preparing a wool triacetate blended fabric, which differs from Example 1 only in the specific bio-enzyme wet treatment: Wet enzymatic treatment of wool tops: temperature 50℃, pH 8.0, time 30 minutes.

[0039] Triacetic acid staple fibers were treated with esterase at 50°C, pH 8.2, for 25 minutes.

[0040] Example 7 This embodiment provides a method for preparing wool triacetate blended fabric, which differs from Example 1 only in the process parameters of one-bath dyeing under normal pressure: one-bath dyeing with the same color is carried out by heating to 105°C under normal pressure and holding for 50 minutes, followed by water washing.

[0041] Example 8 This embodiment provides a method for preparing wool triacetate blended fabric. The only difference between this method and Example 1 is the process parameters of the low-temperature post-setting process: the dyed fabric is sent into a setting machine for stretching and heat setting, the heat setting temperature is controlled at 150℃, and the machine speed is 30m / min.

[0042] Comparative Example 1 The only difference between this comparative example and Example 1 is that the "plasma pretreatment" step in step S1 is omitted, and the untreated raw wool tops and triacetate staple fibers are directly subjected to specific bio-enzymatic wet treatment. The remaining parameters and steps (including 100°C atmospheric pressure co-bath dyeing) are completely consistent with Example 1.

[0043] Comparative Example 2 The only difference between this comparative example and Example 1 is that the "specific biological enzyme wet treatment" and enzyme inactivation step S1 are omitted. That is, the fiber sliver is directly dried after plasma pretreatment and then proceeds to step S2 for spinning. The remaining steps are completely consistent with Example 1.

[0044] Comparative Example 3 This comparative example simulates the conventional processing technology: wool tops and triacetate staple fiber tops are directly mixed and spun without any pretreatment or modification in step S1. In the dyeing stage (S3), since the triacetate is unmodified, it must be dyed with disperse dyes at 130°C under high temperature and high pressure for 45 minutes; subsequently, the temperature is lowered to 90°C, and then acid dyes are used for over-dyeing the wool (i.e., two-bath dyeing). The setting temperature is the traditional 180°C required for triacetate dyeing.

[0045] Performance testing I. Detection Methods The blended fabrics obtained from the above-mentioned embodiments and comparative examples were subjected to performance testing, and the testing standards are as follows: Wool strength retention: The breaking strength was tested according to GB / T 3923.1-2013, and the percentage retained before and after modification was calculated. Color matching in the same bath: The color difference (ΔE) between wool and triacetate fiber was measured using a computer colorimetric system. The smaller the ΔE, the better the color matching (Grade 1 is the worst, Grade 5 is the best). Size shrinkage (machine wash shrinkage resistance): The average shrinkage rate of the fabric in the warp and weft directions was tested according to GB / T 8629-2017 (3 machine washes using the 5A program). Wool yellowing index (YI): Measured according to GB / T 17644-2008; the higher the value, the more severe the yellowing. II. Test Results Table 1. Performance test results of wool triacetate blended fabrics Furthermore, testing revealed that the wool triacetate blended fabrics obtained in Examples 3-8 all had wool weight reduction rates controlled between 2% and 4%, wool strength retention rates all above 95%, colorfastness under normal pressure reaching grade 4.0 or above, and machine washing shrinkage rates all below 3%. All performance indicators were similar to those in Examples 1 and 2, confirming that excellent technical effects could be achieved within the range of process parameters claimed in this application.

[0046] As shown in Table 1: Comparing the data from Examples 1-2 with Comparative Examples 1 and 2 reveals that the "low-temperature plasma pretreatment" and "specific bio-enzyme wet treatment" in this invention are not two isolated conventional steps, but rather exhibit a remarkably significant nonlinear synergistic effect. In Comparative Example 1 (using only bio-enzymes), due to the lack of pre-plasma physical etching, the extremely dense and hydrophobic triacetate fiber surface could not effectively adsorb and bind enzyme molecules, resulting in extremely low micro-deacetylation and a colorfastness of only 1.5 at ambient pressure (almost impossible to dye); simultaneously, the wool weight loss was only 0.8%, the scales were not substantially damaged, and the shrinkage rate was as high as 8.5%. Similarly, in Comparative Example 2 (using only plasma), due to the lack of enzymatic chemical degradation, the polar hydrophilic structure of the triacetate fiber surface could not be altered, resulting in a colorfastness of only 2.0 at ambient pressure. In Examples 1 and 2, however, the low-temperature plasma first etched micropores on the fiber surface, thereby opening microscopic channels, greatly improving the targeting precision and substrate accessibility of the subsequent bio-enzyme treatment. It is precisely because of the close cooperation between the two that the micro-deacetylation of triacetate fiber and the moderate passivation of wool scales can be successfully completed, thus achieving excellent color matching of grade 4.0 or higher at 100°C and normal pressure.

[0047] Comparative examples 1 and 2 with Comparative Example 3 further demonstrate that this invention completely resolves the inherent process contradictions in dyeing wool and triacetate blends. Comparative Example 3 employed the conventional high-temperature, high-pressure two-bath dyeing process. To forcefully dye the original triacetate fibers, the high temperature of 130°C caused devastating thermal damage to the wool keratin, resulting in a sharp drop in wool strength retention to 74.3% (severe fiber embrittlement) and irreversible thermodynamic yellowing. The YI value soared to 28.6, causing severe yellowing and an itchy feel. In contrast, this invention, through the underlying modification of the fiber by micro-deacetylation in the front section, cleverly lowers the high-pressure dyeing temperature of triacetate fibers to atmospheric pressure boiling dyeing, completely avoiding the high-temperature conditions of traditional processes. In the examples, the wool strength retention rate was over 95%, and the yellowing index remained stable within the excellent range of 12.3~12.8. No heat-damaged, yellowed wool fibers were found inside the fabric, completely breaking the traditional technical prejudice that "triacetate must rely on high-temperature, high-pressure dyeing."

[0048] Furthermore, the dimensional shrinkage rate of the blended fabrics obtained in this application was strictly controlled within 3% after washing, far superior to the 6.2%~9.8% of the comparative examples. This indicates that the moderate hydrolysis of the wool cuticle layer by macromolecular proteases successfully eliminated the directional friction effect of wool fibers; combined with the lowered post-setting process temperature, the stiffness of the fabric caused by traditional high-temperature setting was effectively avoided. The final product achieved excellent machine-washable shrinkage resistance and dimensional stability without chlorine pollution, possessing extremely high ecological and environmental value and commercial promotion potential.

[0049] In summary, this invention, through a unique multidimensional synergistic modification process, not only simplifies the process flow and reduces energy consumption, but also completely solves the problem of blending two fibers with completely different properties at the microscopic level, achieving unexpected technical effects and possessing outstanding substantive characteristics and significant progress.

[0050] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing a wool triacetate blended fabric, characterized in that, Includes the following steps: S1. Wool tops and triacetate staple fiber strips are subjected to continuous low-temperature plasma pretreatment respectively; then, the pretreated wool tops and triacetate staple fiber strips are respectively sent to a specific biological enzyme bath for wet enzyme treatment; after the enzyme treatment, the enzyme is inactivated, washed with water and dried to obtain modified wool tops and modified triacetate staple fiber strips. S2. The modified wool sliver and modified triacetate staple fiber sliver are combed and blended, spun into wool triacetate blended yarn through roving and spinning processes, and woven into fabric. S3. Place the fabric at 98~105℃ under normal pressure and dye it using a one-bath dyeing method. S4. Perform heat setting treatment on the dyed fabric, with the heat setting temperature controlled at 150~160℃; In step S1, the wet enzymatic treatment of the wool strip uses a protease to moderately peel off the hydrophobic scales on the surface of the wool fiber, resulting in rounded edges; the wet enzymatic treatment of the triacetic acid staple fiber uses an esterase or a keratinase to cause a micro-deacetylation reaction on the surface of the triacetic acid fiber.

2. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S1, the low-temperature plasma pretreatment uses a mixture of oxygen and argon as the working gas, with a processing power of 150~250W and a processing time of 10~30 seconds; the volume ratio of oxygen to argon in the mixture is 1:3~5.

3. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S1, the conditions for wet enzymatic treatment of wool strips are: temperature 45~50℃, pH value 7.5~8.0, and treatment time 20~30 minutes; the fiber reduction rate of the treated wool strips is controlled at 2%~4%.

4. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S1, the conditions for wet enzymatic treatment of triacetic acid short fibers are: temperature 40℃~50℃, pH value 7.8~8.2, and treatment time 15~25 minutes.

5. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S1, the enzyme inactivation step is: heating the treatment solution to 80~85℃ and maintaining it for 10~30 minutes.

6. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S1, the protease used for the wool strip is Bacillus subtilis alkaline protease; the esterase used for the triacetate staple fiber strip is acetylesterase; and the keratinase is Fusarium keratinase or Thermolyticus keratinase.

7. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S2, during the first combing process, a general-purpose antistatic oil is sprayed onto the modified wool top and the modified triacetate staple fiber top, with an application rate of 0.5% to 0.8% of the total fiber weight; and the combing process includes 3 to 4 mixing passes to ensure that the two types of fibers are evenly distributed across the yarn cross-section.

8. The method for preparing wool triacetate blended fabric according to claim 1, characterized in that, In step S3, the one-bath dyeing method uses a dye bath in which disperse dye and acid dye are added together, and an anti-staining agent is added. The dyeing is carried out at 98~100℃ for 45~60 minutes under normal pressure.

9. A wool triacetate blended fabric prepared by the method according to any one of claims 1-8, characterized in that, The blended fabric is woven from a single blended yarn containing modified wool fibers and modified triacetate fibers. The modified wool fiber has a hydrophobic scale layer with rounded edges due to plasma etching and protease hydrolysis; the modified triacetate fiber has micropores on its surface, and its surface layer exhibits a polar hydrophilic cellulose structure due to deacetylation; and there are no yellowed wool fibers inside the fabric.

10. The wool triacetate blended fabric according to claim 9, characterized in that, The blended fabric has the same color imparted by same bath dyeing, the strength retention rate of wool fibers is greater than 95%, and the dimensional shrinkage rate of the fabric is less than 3%.

Images