Anti-pilling wool tencel fabric and preparation method thereof

Abstract

The invention belongs to the technical field of textile fabrics, and particularly relates to an anti-pilling wool tencel fabric and a preparation method thereof. The anti-pilling wool tencel fabric comprises a core layer fiber raw material, a sheath layer fiber raw material, a composite bio-enzyme finishing liquid and a composite cross-linking finishing liquid, wherein the fiber raw materials of the core layer comprise 40-60 parts of wool fibers, 30-50 parts of tencel fibers and 5-15 parts of polyester fibers with special-shaped sections; the fiber raw materials of the sheath layer comprise 20-40 parts of wool fibers and 50-80 parts of tencel fibers; according to the invention, wool fibers which are easy to pilling are isolated through the core-sheath structure, and migration and slip-out of the fibers are reduced through the supporting effect of the internal skeleton; in the finishing process, a composite bio-enzyme and composite cross-linking synergistic effect is adopted, the washing step after enzyme treatment is omitted, the ideal surface state of the fibers is reserved to strengthen the cross-linking effect, uniform and compact combination is ensured in cooperation with a microwave curing technology, and long-acting anti-pilling protection is formed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of textile fabrics, and particularly relates to an anti-pilling wool tencel fabric and a preparation method thereof. BACKGROUND

[0002] The wool tencel blended fabric has the natural advantages of warmth retention, elasticity of wool and skin-friendly smoothness, moisture absorption and air permeability of tencel, and is increasingly widely used in high-end clothing and home textiles, and becomes one of the mainstream fabrics that meet the demand of modern consumers for high-quality textile products. However, the blended fabric is long-term faced with the outstanding technical problem of pilling in the actual wearing and using process, which seriously restricts its market value and service life. Wool fibers and tencel fibers together make the surface of the fabric prone to form pills. These pills are difficult to fall off and become more and more obvious with the increase of wearing times and washing times, which not only destroys the appearance neatness of the fabric, but also reduces the wearing comfort and durability of the fabric.

[0003] To solve the above-mentioned pilling problem, the prior art mostly adopts the simple blending of wool, tencel and other fibers, trying to improve the cohesion by physical interweaving between fibers. However, this irregular mixing mode easily causes mutual interference of different fiber functions, which not only cannot form a targeted anti-pilling protective structure, but also may damage the natural excellent properties of wool and tencel. In addition, the hot air curing method commonly used in the existing process has the problem of uneven heating, which easily causes local overcrosslinking or insufficient crosslinking of the finishing agent, further aggravating the imbalance of the performance of the fabric. Therefore, it has become an urgent task in the textile field to develop a wool tencel fabric that can solve the pilling problem from the root and has multiple excellent properties. SUMMARY

[0004] In view of the defects of the prior art, the application provides an anti-pilling wool tencel fabric and a preparation method thereof. The application adopts core-sheath partition design at the yarn level to realize the precise layout of different functional fibers, reduce fiber slippage and winding from the source, and adopts the synergistic effect of composite biological enzyme treatment and composite crosslinking finishing in the finishing process, omits the washing step after enzyme treatment, retains the ideal surface state of the fibers to strengthen the crosslinking effect, and cooperates with the microwave curing technology to ensure uniform and dense combination of the finishing agent, and finally forms a full-range and long-acting anti-pilling protection. The technical problems that the existing wool tencel blended fabric is prone to pilling, the long-acting anti-pilling effect is poor, and the anti-pilling finishing is difficult to consider the comfort, wear resistance and air permeability of the fabric are solved.

[0005] In order to achieve the above technical purposes, the technical scheme adopted by the application is as follows: This invention provides an anti-pilling wool Tencel fabric, which comprises a core fiber material, a sheath fiber material, a composite bio-enzyme finishing solution, and a composite crosslinking finishing solution; wherein, the core fiber material comprises 40-60 parts wool fiber, 30-50 parts Tencel fiber, and 5-15 parts profiled cross-section polyester fiber; the sheath fiber material comprises 20-40 parts wool fiber and 50-80 parts Tencel fiber; Preferably, the irregularly shaped polyester fiber is at least one of triangular cross-section polyester fiber, cross-shaped cross-section polyester fiber, and trilobal cross-section polyester fiber.

[0006] Furthermore, the preparation of the composite bio-enzyme finishing solution is as follows: 3.0% by mass of composite bio-enzyme and 1.5% by mass of modified nanocellulose are added to an acetate-sodium acetate buffer solution with a pH of 5.5, and the mixture is stirred evenly by mechanical stirring to form the composite bio-enzyme finishing solution.

[0007] Furthermore, the composite bioenzyme is composed of cellulase and protease in a mass ratio of 3:1.

[0008] Further, the composite crosslinking finishing liquid is prepared by mixing 8% by mass of waterborne polyurethane and 1.0% by mass of graphene oxide aqueous dispersion, mechanically stirring for 30 min, and then slowly adding 3.0% by mass of modified nanocellulose while continuously stirring for 60-90 min to obtain the composite crosslinking finishing liquid.

[0009] Furthermore, the preparation process of the modified nanocellulose is as follows: i. Weigh out the nanocellulose solid and disperse it in anhydrous DMF (N,N-dimethylformamide). The ratio of nanocellulose solid to anhydrous DMF is 1g:50mL. Disperse the nanocellulose solid in a 60℃ water bath at a mechanical stirring speed of 500 rpm for 2 h to form a uniform nanocellulose suspension. Add 4-dimethylaminopyridine to the suspension and continue stirring at 60℃ for 30 minutes to ensure thorough mixing and form a reaction system. ii. Using a constant pressure dropping funnel, slowly add acetic anhydride to the reaction system, controlling the dropping rate, and complete the addition within 1 hour. Then, raise the reaction temperature to 80°C and reflux the reaction under nitrogen protection for 4 hours. After the reaction is completed, cool to room temperature, centrifuge and wash until the supernatant is neutral and has no acetic acid odor to ensure complete removal of unreacted acetic anhydride, catalyst and byproduct acetic acid. Redisperse the washed precipitate in anhydrous ethanol and then freeze-dry for 48 hours to obtain modified nanocellulose.

[0010] Furthermore, the ratio of the amount of nanocellulose, 4-dimethylaminopyridine, and acetic anhydride is 5g:1g:1.5mL.

[0011] This invention also provides a method for preparing anti-pilling wool Tencel fabric, specifically including the following steps: S1, Core fiber and sheath fiber preparation: The core fiber raw material is fully mixed on an opening machine to form core fiber. The sheath fiber raw material is mixed, wherein the wool fiber is pretreated with a gentle protease to soften the scales and form sheath fiber. S2, core fiber and sheath fiber are made into slivers separately: the above-mentioned mixed core fiber and sheath fiber are processed by opening, carding and drawing processes to make core sliver and sheath sliver respectively; S3, Spinning of core-sheath structure yarn: Using Sirofil spinning technology on the FA506 spinning frame, the core layer sliver is used as the core of the yarn and the sheath layer sliver is used as the sheath of the yarn. By adjusting the process parameters, the final yarn count is controlled to be a core-sheath structure yarn of 40-60 English count. S4, Weaving and Pretreatment: The prepared core-sheath structure yarns are used as warp and weft yarns and woven into plain, twill or satin fabrics on an air-jet loom. The greige fabric is desized and scouring in hot water at 60 ℃ to remove the oils and sizing agents added during spinning and weaving. Then it is washed with water until neutral to obtain the pretreated fabric. S5, Bio-enzyme polishing treatment: The pre-treated fabric is immersed in a composite bio-enzyme finishing solution with a liquor ratio of 1:15-25 and mechanically treated at 50℃ for 45 min. After the enzyme treatment, the fabric is directly taken out and uniformly rolled, controlling the liquid content to 100% to form the rolled fabric, which then immediately enters the next finishing process without water washing. S6, Microwave curing to obtain anti-pilling wool Tencel fabric: The rolled fabric is immersed in a composite crosslinking finishing liquid, and then rolled by a rolling mill at a pressure of 0.3MPa, controlling the liquid content to be 70-80%. The rolled fabric is placed in a microwave drying and setting machine and treated at 105℃ for 3 minutes to complete the curing. The cured fabric is then stretched and set at 130℃, then treated by a pre-shrinking machine, and finally inspected and packaged to obtain anti-pilling wool Tencel fabric.

[0012] Furthermore, the protease pretreatment process is as follows: the wool fibers are immersed in a pretreatment solution consisting of 1.0%-2.0% by mass of neutral protease, 1.5%-3.0% by mass of fatty alcohol polyoxyethylene ether, and a buffer solution with a pH of 6.5-7.5, with the bath ratio controlled at 1:15-25. The solution is slowly stirred at 45-50°C for 30-45 min, then heated to 80-85°C and held for 10 min to inactivate the enzyme, and finally washed with warm water and dried.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention employs a core-sheath partitioned yarn structure, achieving precise adaptation of fiber functions. The core layer forms a stable supporting skeleton through a specific fiber combination. Utilizing the low-friction characteristics of irregularly shaped cross-section fibers, it reduces relative slippage and entanglement of fibers within the yarn, suppressing the internal causes of fuzz formation at their source. The sheath layer is primarily composed of wool and Tencel in an optimized ratio, retaining both the warmth and elasticity of wool and the smooth texture of Tencel. Pre-treated wool scales are more suitable for subsequent finishing processes, creating a smooth, non-pilling surface on the fabric. The bio-enzymatic polishing treatment, through a precise combination of cellulase and protease, achieves polishing of the Tencel surface and gentle etching of the wool scales. Simultaneously, surface-acetylated modified nanocellulose is introduced, softening the fiber surface while enhancing inter-fiber cohesion, avoiding fiber damage that might result from single-enzyme treatment. Furthermore, eliminating the post-enzyme washing step not only reduces production steps and water consumption but also preserves the ideal surface state of the fibers after enzymatic hydrolysis, allowing residual active ingredients to become a bridge for subsequent cross-linking, significantly improving cross-linking adhesion. In this invention, the aqueous polyurethane in the composite crosslinking finishing liquid acts as the film-forming host, firmly anchoring the fiber ends. Graphene oxide, with its unique structure, enhances the wear resistance and stability of the crosslinked film, while acetylated modified nanocellulose effectively neutralizes the stiffness caused by the resin. The microporous film formed by these three components not only locks onto the smooth fiber surface after enzyme treatment but also possesses good elasticity and breathability. The microwave curing technology utilizes its volumetric heating characteristics to allow the finishing liquid to crosslink simultaneously from the fiber interior to the surface, ensuring a uniform and dense crosslinked film. Simultaneously, the high efficiency of microwave curing shortens curing time, reduces energy consumption, and the gentle heating method maximizes the preservation of the natural softness of wool and Tencel, avoiding damage to the fibers caused by high temperatures. The resulting anti-pilling wool-Tencel fabric possesses long-lasting and stable anti-pilling capabilities while fully retaining the warmth of wool and the skin-friendliness of Tencel. Furthermore, the fabric's strength and dimensional stability are unaffected by the anti-pilling finishing process. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the preparation method of the anti-pilling wool Tencel fabric of the present invention. Figure 2 This is a fabric appearance diagram of the anti-pilling wool Tencel fabric prepared according to the present invention. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] According to the flowchart of the preparation method of the anti-pilling wool Tencel fabric of the present invention, as shown... Figure 1 As shown, the following embodiment is performed: Example 1: This example provides an anti-pilling wool Tencel fabric, which includes core fiber raw material, sheath fiber raw material, composite bio-enzyme finishing liquid and composite crosslinking finishing liquid; wherein, the core fiber raw material includes 40 parts wool fiber, 30 parts Tencel fiber and 5 parts triangular cross-section polyester fiber; the sheath fiber raw material includes 20 parts wool fiber and 50 parts Tencel fiber. Preparation of the composite bio-enzyme finishing solution: Add 3.0% by mass of composite bio-enzyme and 1.5% by mass of modified nanocellulose to an acetate-sodium acetate buffer solution with a pH of 5.5, and mix evenly by mechanical stirring to form the composite bio-enzyme finishing solution.

[0017] The composite bioenzyme is composed of cellulase and protease in a mass ratio of 3:1.

[0018] Preparation of the composite crosslinking finishing solution: Mix 8% by mass of waterborne polyurethane and 1.0% by mass of graphene oxide aqueous dispersion, mechanically stir at 300 rpm for 30 min, slowly add 3.0% by mass of modified nanocellulose while stirring continuously for 60 min to obtain the composite crosslinking finishing solution.

[0019] The preparation process of the modified nanocellulose is as follows: i. Weigh out the nanocellulose solid and disperse it in anhydrous DMF. The ratio of nanocellulose solid to anhydrous DMF is 1g:50mL. Disperse the nanocellulose solid in a 60℃ water bath at a mechanical stirring speed of 500 rpm for 2 h to form a uniform nanocellulose suspension. Add 4-dimethylaminopyridine to the suspension. The ratio of nanocellulose, 4-dimethylaminopyridine to acetic anhydride is 5g:1g:1.5mL. Continue stirring at 60℃ for 30 min to ensure thorough mixing and form a reaction system. ii. Using a constant-pressure dropping funnel, acetic anhydride was slowly added dropwise to the reaction system, controlling the dropping rate, and the addition was completed within 1 hour. Subsequently, the reaction temperature was raised to 80°C, and the reaction was continuously refluxed for 4 hours under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, and the reaction product was repeatedly centrifuged and washed with a large amount of anhydrous ethanol at a speed of 10,000 rpm for 15 minutes until the supernatant was neutral and had no acetic acid odor, to ensure that unreacted acetic anhydride, catalyst, and byproduct acetic acid were completely removed. The washed precipitate was redispersed in anhydrous ethanol at a ratio of 1 g to 5 mL. The mixture was pre-frozen at -50°C and then dried at -50°C under a vacuum of 10 Pa for 48 hours to obtain loose and porous modified nanocellulose.

[0020] This embodiment also provides a method for preparing anti-pilling wool Tencel fabric, which specifically includes the following steps: S1, Preparation of core and sheath fibers: Take core fiber raw materials (40 parts wool fiber, 30 parts Tencel fiber, and 5 parts triangular cross-section polyester fiber) and mix them thoroughly on an opening machine to form uniform core fibers. Weigh sheath fiber raw materials (20 parts wool fiber and 50 parts Tencel fiber) and mix them thoroughly on an opening machine. The wool fiber is pretreated with a gentle protease to soften the scales and form sheath fibers. S2, core fiber and sheath fiber are made into slivers separately: the above-mentioned mixed core fiber and sheath fiber are processed by opening, carding and drawing processes to make core sliver and sheath sliver respectively; S3, Spinning of core-sheath structure yarn: Using Sirofil spinning technology on the FA506 spinning frame, the core layer sliver is used as the core of the yarn and the sheath layer sliver is used as the sheath of the yarn. By adjusting the process parameters, the final yarn count is controlled to be a core-sheath structure yarn of 40 English count. S4, Weaving and Pretreatment: The prepared core-sheath structure yarns are used as warp and weft yarns and woven into plain, twill or satin fabrics on an air-jet loom. The greige fabric is desized and scouring in hot water at 60 ℃ to remove the oils and sizing agents added during spinning and weaving. Then it is washed with water until neutral to obtain the pretreated fabric. S5, Bio-enzyme polishing treatment: The pre-treated fabric is immersed in a composite bio-enzyme finishing solution with a liquor ratio of 1:15 and treated at 50°C with mechanical rotation at 30 rpm for 45 minutes. After the enzyme treatment, the fabric is directly taken out and uniformly rolled, controlling the liquid content to 100% to form the rolled fabric, which then immediately enters the next finishing process without water washing. S6, Microwave curing to obtain anti-pilling wool Tencel fabric: The rolled fabric is immersed in a composite crosslinking finishing liquid with a liquor ratio controlled at 1:15. Then, it is rolled by a rolling mill under a pressure of 0.3MPa, with the liquid content controlled at 70%. The rolled fabric is placed in a microwave drying and setting machine and treated at 105℃ for 3 minutes to complete the curing. The cured fabric is then stretched and set at 130℃, then treated by a pre-shrinking machine, and finally inspected and packaged to obtain anti-pilling wool Tencel fabric.

[0021] The protease pretreatment process is as follows: wool fibers are immersed in a pretreatment solution consisting of 1.0% by mass of neutral protease, 1.5% by mass of fatty alcohol polyoxyethylene ether, and a buffer solution with a pH of 6.5. The bath ratio is controlled at 1:15. The solution is slowly stirred at 45 °C for 30 min, then heated to 80 °C and held for 10 min to inactivate the enzyme. Finally, the fibers are washed with warm water and dried.

[0022] Example 2: This example provides an anti-pilling wool Tencel fabric, which includes core fiber raw material, sheath fiber raw material, composite bio-enzyme finishing liquid and composite cross-linking finishing liquid; wherein, the core fiber raw material includes 50 parts wool fiber, 40 parts Tencel fiber and 10 parts cross-section polyester fiber; the sheath fiber raw material includes 30 parts wool fiber and 65 parts Tencel fiber. Preparation of the composite bio-enzyme finishing solution: Add 3.0% by mass of composite bio-enzyme and 1.5% by mass of modified nanocellulose to an acetate-sodium acetate buffer solution with a pH of 5.5, and mix evenly by mechanical stirring to form the composite bio-enzyme finishing solution.

[0023] The composite bioenzyme is composed of cellulase and protease in a mass ratio of 3:1.

[0024] Preparation of the composite crosslinking finishing solution: Mix 8% by mass of waterborne polyurethane and 1.0% by mass of graphene oxide aqueous dispersion, and mechanically stir at 400 rpm for 30 min. Under continuous stirring, slowly add 3.0% by mass of modified nanocellulose and continue stirring for 75 min to obtain the composite crosslinking finishing solution.

[0025] The preparation process of the modified nanocellulose is as follows: i. Weigh out the nanocellulose solid and disperse it in anhydrous DMF. The ratio of nanocellulose solid to anhydrous DMF is 1g:50mL. Disperse the nanocellulose solid in a 60℃ water bath at a mechanical stirring speed of 500 rpm for 2 h to form a uniform nanocellulose suspension. Add 4-dimethylaminopyridine to the suspension. The ratio of nanocellulose, 4-dimethylaminopyridine to acetic anhydride is 5g:1g:1.5mL. Continue stirring at 60℃ for 30 min to ensure thorough mixing and form a reaction system. ii. Using a constant-pressure dropping funnel, acetic anhydride was slowly added dropwise to the reaction system, controlling the dropping rate and completing the addition within 1 hour. Subsequently, the reaction temperature was raised to 80°C, and the reaction was continuously refluxed for 4 hours under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, and the reaction product was repeatedly centrifuged and washed with a large amount of anhydrous ethanol at a speed of 10,000 rpm for 15 minutes until the supernatant was neutral and had no acetic acid odor, to ensure complete removal of unreacted acetic anhydride, catalyst, and byproduct acetic acid. The washed precipitate was redispersed in anhydrous ethanol at a ratio of 1 g: 8 mL. The mixture was pre-frozen at -50°C using freeze-drying technology, and then dried at -50°C under a vacuum of 10 Pa for 48 hours to obtain loose and porous modified nanocellulose.

[0026] This embodiment also provides a method for preparing anti-pilling wool Tencel fabric, which specifically includes the following steps: S1, Preparation of core and sheath fibers: Take core fiber raw materials (50 parts wool fiber, 40 parts Tencel fiber and 10 parts cross-section polyester fiber) and mix them thoroughly on an opening machine to form core fibers. Weigh sheath fiber raw materials (30 parts wool fiber and 65 parts Tencel fiber) and mix them evenly on an opening machine. The wool fiber is pretreated with a gentle protease to soften the scales and form sheath fibers. S2, core fiber and sheath fiber are made into slivers separately: the above-mentioned mixed core fiber and sheath fiber are processed by opening, carding and drawing processes to make core sliver and sheath sliver respectively; S3, Spinning of core-sheath structure yarn: Using Sirofil spinning technology on the FA506 spinning frame, the core layer sliver is used as the core of the yarn and the sheath layer sliver is used as the sheath of the yarn. By adjusting the process parameters, the final yarn count is controlled to be a core-sheath structure yarn of 50 English count. S4, Weaving and Pretreatment: The prepared core-sheath structure yarns are used as warp and weft yarns and woven into plain, twill or satin fabrics on an air-jet loom. The greige fabric is desized and scouring in hot water at 60 ℃ to remove the oils and sizing agents added during spinning and weaving. Then it is washed with water until neutral to obtain the pretreated fabric. S5, Bio-enzyme polishing treatment: The pre-treated fabric is immersed in a composite bio-enzyme finishing solution with a liquor ratio of 1:20 and treated at 50°C with mechanical rotation at 30 rpm for 45 minutes. After the enzyme treatment, the fabric is directly taken out and uniformly rolled, controlling the liquid content to 100% to form the rolled fabric, which then immediately enters the next finishing process without water washing. S6, Microwave curing to obtain anti-pilling wool Tencel fabric: The rolled fabric is immersed in a composite crosslinking finishing liquid with a liquor ratio of 1:20, and then rolled by a rolling mill under a pressure of 0.3MPa, controlling the liquid content to 78%. The rolled fabric is placed in a microwave drying and setting machine and treated at 105℃ for 3 minutes to complete the curing. The cured fabric is then stretched and set at 130℃, then treated by a pre-shrinking machine, and finally inspected and packaged to obtain anti-pilling wool Tencel fabric.

[0027] The protease pretreatment process is as follows: wool fibers are immersed in a pretreatment solution consisting of 1.5% by mass of neutral protease, 2.0% by mass of fatty alcohol polyoxyethylene ether, and a buffer solution with a pH of 7. The bath ratio is controlled at 1:20. The solution is slowly stirred at 50°C for 45 minutes, then heated to 85°C and held for 10 minutes to inactivate the enzyme. Finally, the fibers are washed with warm water and dried.

[0028] Example 3: This example provides an anti-pilling wool Tencel fabric, which includes core fiber raw material, sheath fiber raw material, composite bio-enzyme finishing liquid and composite crosslinking finishing liquid; wherein, the core fiber raw material includes 60 parts wool fiber, 50 parts Tencel fiber and 15 parts trilobal cross-section polyester fiber; the sheath fiber raw material includes 40 parts wool fiber and 80 parts Tencel fiber. Preparation of the composite bio-enzyme finishing solution: Add 3.0% by mass of composite bio-enzyme and 1.5% by mass of modified nanocellulose to an acetate-sodium acetate buffer solution with a pH of 5.5, and mix evenly by mechanical stirring to form the composite bio-enzyme finishing solution.

[0029] The composite bioenzyme is composed of cellulase and protease in a mass ratio of 3:1.

[0030] Preparation of the composite crosslinking finishing solution: Mix 8% by mass of waterborne polyurethane and 1.0% by mass of graphene oxide aqueous dispersion, and mechanically stir at 500 rpm for 30 min. Under continuous stirring, slowly add 3.0% by mass of modified nanocellulose and continue stirring for 90 min to obtain the composite crosslinking finishing solution.

[0031] The preparation process of the modified nanocellulose is as follows: i. Weigh out the nanocellulose solid and disperse it in anhydrous DMF. The ratio of nanocellulose solid to anhydrous DMF is 1g:50mL. Disperse the nanocellulose solid in a 60℃ water bath at a mechanical stirring speed of 500 rpm for 2 h to form a uniform nanocellulose suspension. Add 4-dimethylaminopyridine to the suspension. The ratio of nanocellulose, 4-dimethylaminopyridine to acetic anhydride is 5g:1g:1.5mL. Continue stirring at 60℃ for 30 min to ensure thorough mixing and form a reaction system. ii. Using a constant-pressure dropping funnel, acetic anhydride was slowly added dropwise to the reaction system, controlling the dropping rate and completing the addition within 1 hour. Subsequently, the reaction temperature was raised to 80°C, and the reaction was continuously refluxed for 4 hours under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, and the reaction product was repeatedly centrifuged and washed with a large amount of anhydrous ethanol at a speed of 10,000 rpm for 15 minutes until the supernatant was neutral and had no acetic acid odor, to ensure complete removal of unreacted acetic anhydride, catalyst, and byproduct acetic acid. The washed precipitate was redispersed in anhydrous ethanol at a ratio of 1 g:10 mL. The mixture was pre-frozen at -50°C using freeze-drying technology, and then dried at -50°C under a vacuum of 10 Pa for 48 hours to obtain loose and porous modified nanocellulose.

[0032] This embodiment also provides a method for preparing anti-pilling wool Tencel fabric, which specifically includes the following steps: S1, Preparation of core and sheath fibers: Take core fiber raw materials (60 parts wool fiber, 50 parts Tencel fiber and 15 parts trilobal cross-section polyester fiber) and mix them thoroughly on an opening machine to form core fibers. Weigh sheath fiber raw materials (40 parts wool fiber and 80 parts Tencel fiber) and mix them evenly on an opening machine. The wool fiber is pretreated with a gentle protease to soften the scales and form sheath fibers. S2, core fiber and sheath fiber are made into slivers separately: the above-mentioned mixed core fiber and sheath fiber are processed by opening, carding and drawing processes to make core sliver and sheath sliver respectively; S3, Spinning of core-sheath structure yarn: Using Sirofil spinning technology on the FA506 spinning frame, the core layer sliver is used as the core of the yarn and the sheath layer sliver is used as the sheath of the yarn. By adjusting the process parameters, the final yarn count is controlled to be a core-sheath structure yarn of 60 English count. S4, Weaving and Pretreatment: The prepared core-sheath structure yarns are used as warp and weft yarns and woven into plain, twill or satin fabrics on an air-jet loom. The greige fabric is desized and scouring in hot water at 60 ℃ to remove the oils and sizing agents added during spinning and weaving. Then it is washed with water until neutral to obtain the pretreated fabric. S5, Bio-enzyme polishing treatment: The pre-treated fabric is immersed in a composite bio-enzyme finishing solution with a liquor ratio of 1:15 and treated at 50°C with mechanical rotation at 30 rpm for 45 minutes. After the enzyme treatment, the fabric is directly taken out and uniformly rolled, controlling the liquid content to 100% to form the rolled fabric, which then immediately enters the next finishing process without water washing. S6, Microwave curing to obtain anti-pilling wool Tencel fabric: The rolled fabric is immersed in a composite crosslinking finishing liquid with a liquor ratio of 1:20, and then rolled by a rolling mill under a pressure of 0.3 MPa, controlling the liquid content to 80%. The rolled fabric is placed in a microwave drying and setting machine and treated at 105 ℃ for 3 min to complete the curing. The cured fabric is then stretched and set at 130 ℃, then treated by a pre-shrinking machine, and finally inspected and packaged to obtain anti-pilling wool Tencel fabric.

[0033] The protease pretreatment process is as follows: wool fibers are immersed in a pretreatment solution consisting of 2.0% by mass of neutral protease, 3.0% by mass of fatty alcohol polyoxyethylene ether, and a buffer solution with a pH of 7.5. The bath ratio is controlled at 1:25. The solution is slowly stirred at 50°C for 45 min, then heated to 85°C and held for 10 min to inactivate the enzyme. Finally, the fibers are washed with warm water and dried.

[0034] Compared with Example 2, Comparative Example 1 eliminated the core sheath structure design, but the rest was exactly the same as Example 2.

[0035] Comparative Example 2 differs from Example 2 in that the addition of MCNF is omitted, while the rest is identical to Example 2.

[0036] Compared with Example 2, Comparative Example 3 added a water washing step in step S5, while the remaining steps were exactly the same as in Example 2.

[0037] Experimental example: 1. Anti-pilling performance: The anti-pilling performance was tested according to standard GB / T4802.2008 "Textiles - Determination of pilling properties of fabrics - Part 2: Modified Martindale". The anti-pilling wool Tencel fabrics prepared in Examples 1-3 and Comparative Examples 1-3 of this invention were used as samples. After 2000 rubs, the grade was evaluated in the pilling rating box. The results are recorded in Table 1.

[0038] 2. Air permeability: Referring to GB / T5453-1997 "Textiles - Determination of Air Permeability of Fabrics", the anti-pilling wool Tencel fabrics prepared in Examples 1-3 and Comparative Examples 1-3 of this invention were used as samples to determine the air permeability of the samples. The test area was 20 cm². 2 The test pressure difference was 100 Pa. Each sample was tested 10 times at different locations, and the average value was taken.

[0039] 3. Hairiness Test: Standard: FZ / T 01086-2000 "Textile Yarn Hairiness Determination Method - Projection Counting Method". Anti-pilling wool Tencel fabrics prepared in Examples 1-3 and Comparative Examples 1-3 of this invention were used as samples, and the YG172A yarn hairiness tester was used for testing. Test method: The yarn hairiness tester speed was set to 30 m / min. The number of hairs within each length of 9 mm was measured. The hairiness length of the blended yarn was set to 3 mm, the segment length to 10 m, and the test was performed 10 times. The hairiness index was taken as the average value, and the results are recorded in Table 1.

[0040] 4. Water Resistance Test: The water resistance performance was tested according to AATCC 61-2006 (No. 1A). Anti-pilling wool-Tencel fabrics prepared in Examples 1-3 and Comparative Examples 1-3 of this invention were used as samples. The sample and 50 standard steel balls were placed in 150 mL of a 0.15% detergent solution and rotated at 40 rpm for 45 min at 40 ℃. Then, the samples were washed with distilled water and dried at 60 ℃ for 5 min. The entire process was defined as one washing cycle. The anti-pilling grade was analyzed, and the results are recorded in Table 1.

[0041] 5. Fabric abrasion resistance: According to GB / T 21196.2-2007 "Textiles - Martindale Method for Determination of Fabric Abrasion Resistance". Test conditions: Pressure 12 kPa, record the number of abrasions until a single yarn breaks or a hole forms in the fabric.

[0042] Table 1: Performance Test Results of Anti-pilling Wool Tencel Fabric

[0043] Table 1 shows that the anti-pilling wool Tencel fabrics prepared in Examples 1-3 have excellent anti-pilling properties. Combined with Comparative Examples 1-2, this indicates that the core-sheath structure of the anti-pilling wool Tencel fabric prepared by this invention structurally reduces the pilling core. The supporting skeleton formed by the low-friction polyester in the core layer reduces slippage within the fibers, and the smooth fibers treated with bio-enzymes in the sheath layer reduce surface friction, thus exhibiting good anti-pilling properties. The hairiness index of Examples 1-3 is as low as 1.9. The less hairiness, the less likely the fibers are to form pills due to friction. Combined with Comparative Examples 1-3, this further demonstrates that the preparation method of this invention plays a good anti-pilling role. The abrasion resistance of Examples 1-3 is stable at around 45,000 cycles, far exceeding that of Comparative Examples 1-3, indicating that the skeleton support of the cross-shaped polyester fiber in the core layer of this invention improves the overall strength of the yarn. In the composite crosslinking finishing liquid, the elastic film formed by water-based polyurethane locks the fibers, while graphene oxide enhances the abrasion resistance of the film. In contrast, the comparative examples lack structural support and composite protection, and the fabric is prone to fiber shedding due to wear. The breathability of Examples 1-3 is all above 420 mm / s, while that of the comparative examples is relatively low, indicating that the present invention not only ensures anti-pilling and abrasion resistance, but also takes into account the high breathability of the fabric.

[0044] Figure 2 The images show the appearance of the anti-pilling wool Tencel fabrics prepared in Example 2 and Comparative Examples 1-3 after 2000 rubs. As can be seen from the images, the anti-pilling wool Tencel fabric of Example 2 has a smooth and flat surface with no obvious pills or loose fibers; while Comparative Examples 1-3 all showed varying degrees of pilling. This indicates that the treatment and preparation process of the anti-pilling wool Tencel fabric of the present invention can effectively resist pilling caused by friction.

[0045] In summary, this invention rationally arranges different functional fibers through core-sheath partitioning. This utilizes the core layer to provide stable support and reduce internal fiber slippage, while the sheath layer's fiber combination and pretreatment create a smooth surface, laying a solid foundation for anti-pilling performance from the source. In terms of finishing process, it breaks with the industry convention of washing after enzyme treatment, using a skip-step process to preserve the ideal surface state and active components of the enzymatically hydrolyzed fibers, making them a natural bridge for subsequent cross-linking and significantly improving the bonding tightness between the finishing agent and the fiber. Simultaneously, the compounded bio-enzymes and the compound cross-linking system complement each other, achieving both fine optimization of the fiber surface and the formation of a protective film with both stability and flexibility through the synergistic effect of multiple components. This not only locks the fiber ends to inhibit pilling but also avoids the fabric stiffness problem caused by a single finishing agent. Ultimately, the prepared anti-pilling wool-Tencel fabric exhibits superior performance in core anti-pilling properties and long-lasting wash resistance. Simultaneously, while maintaining excellent breathability and abrasion resistance, it fully preserves the natural comfort characteristics of wool and Tencel, resolving the long-standing contradiction between anti-pilling performance and wearing comfort and durability. Furthermore, the entire process is compatible with existing textile production equipment, enabling industrialization without large-scale modifications. This lowers the production threshold and provides high-quality fabrics for the high-end apparel sector, significantly enhancing product market competitiveness. It offers a novel and practical approach to anti-pilling modification of wool-Tencel fabrics.

[0046] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing an anti-pilling wool Tencel fabric, characterized in that, Specifically, the following steps are included: S1, Preparation of core fiber and sheath fiber: Take core fiber raw materials and mix them thoroughly to form core fiber; take sheath fiber raw materials and mix them. Among them, wool fiber is pretreated with protease to form sheath fiber. S2, core fiber and sheath fiber are made into slivers separately: core fiber and sheath fiber are made into core sliver and sheath sliver respectively through opening, carding and drawing processes; S3, Spinning of core-sheath structure yarn: Using Sirofil spinning technology, the core layer sliver is used as the core of the yarn and the sheath layer sliver is used as the sheath of the yarn to spin and produce core-sheath structure yarn. S4, Weaving and Pretreatment: The prepared core-sheath structure yarns are used as warp and weft yarns to weave into greige fabric. The greige fabric is desized and scouring, and washed with water until neutral to obtain the pretreated fabric. S5, Bio-enzyme polishing treatment: The pre-treated fabric is immersed in a composite bio-enzyme finishing solution for bio-enzyme polishing treatment. After the treatment is completed, it is directly taken out and uniformly rolled to form the rolled fabric. S6, Microwave curing to obtain anti-pilling wool Tencel fabric: The rolled fabric is immersed in a composite crosslinking finishing liquid, then rolled, the liquid content is controlled, the rolled fabric is microwave cured, stretched and shaped, then treated by a pre-shrinking machine, inspected, and packaged to obtain anti-pilling wool Tencel fabric.

2. The method for preparing an anti-pilling wool Tencel fabric according to claim 1, characterized in that, The core fiber raw material includes 40-60 parts wool fiber, 30-50 parts Tencel fiber, and 5-15 parts profiled cross-section polyester fiber; the sheath fiber raw material includes 20-40 parts wool fiber and 50-80 parts Tencel fiber.

3. The method for preparing an anti-pilling wool Tencel fabric according to claim 1, characterized in that, In step S5, the bath ratio of the treated fabric to the composite bio-enzyme finishing solution is 1:15-25.

4. The method for preparing an anti-pilling wool Tencel fabric according to claim 1, characterized in that, In step S5, the preparation of the composite bio-enzyme finishing solution is as follows: 3.0% by mass of composite bio-enzyme and 1.5% by mass of modified nanocellulose are added to an acetate-sodium acetate buffer solution with a pH of 5.

5. The mixture is stirred mechanically to form a composite bio-enzyme finishing solution. The composite bio-enzyme is composed of cellulase and protease in a mass ratio of 3:

1.

5. The method for preparing an anti-pilling wool Tencel fabric according to claim 1, characterized in that, In step S6, the composite crosslinking finishing liquid is prepared by mixing 8% by mass of waterborne polyurethane and 1.0% by mass of graphene oxide aqueous dispersion. While stirring continuously, 3.0% by mass of modified nanocellulose is slowly added and stirred continuously to obtain the composite crosslinking finishing liquid.

6. The method for preparing an anti-pilling wool Tencel fabric according to claim 4 or 5, characterized in that, The preparation process of the modified nanocellulose is as follows: i. Weigh out the nanocellulose solid, disperse it in anhydrous DMF, stir to disperse, form a nanocellulose suspension, add 4-dimethylaminopyridine to the suspension, continue stirring to form a reaction system; ii. Slowly add acetic anhydride dropwise to the reaction system, then heat and continuously reflux the reaction. After the reaction is complete, cool to room temperature, centrifuge and wash to obtain the precipitate. Redisperse the precipitate in anhydrous ethanol and freeze-dry to obtain modified nanocellulose.

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