Renewable ramie fiber / wool blended fabric and environment-friendly dyeing and finishing process thereof

Abstract

The invention discloses a renewable ramie fiber / wool blended fabric and an environment-friendly dyeing and finishing process thereof, and belongs to the technical field of textile fabrics. The renewable ramie fiber / wool blended fabric is prepared from, by mass, 30%-50% of renewable ramie fibers, 25%-40% of wool fibers, 15%-30% of regenerated cellulose fibers and 0.5%-3% of functional auxiliaries, the ramie fibers are derived from recycled products, and the auxiliaries contain antibacterial agents and anti-wrinkle agents. During preparation, fibers are subjected to ultrasonic pretreatment, spinning and weaving to obtain grey cloth; the dyeing and finishing adopts biological enzyme desizing, hydrogen peroxide bleaching, natural vegetable dye dyeing and formaldehyde-free color fixation. The antibacterial rate of the fabric is larger than or equal to 90%, the anti-wrinkle recovery angle is larger than or equal to 280 degrees, the COD of dyeing and finishing wastewater is smaller than or equal to 400 mg / L, formaldehyde residues are avoided, energy consumption is low, excellent performance and environmental friendliness are both considered, and the method is suitable for the field of spinning.

Description

Technical Field

[0001] This invention relates to the field of textile fabrics, and in particular to a renewable ramie fiber / wool blended fabric and its environmentally friendly dyeing and finishing process. Background Technology

[0002] With increasing environmental awareness and the popularization of sustainable development concepts, the textile industry's demand for renewable and environmentally friendly fabrics is growing. Ramie fiber, as a natural renewable fiber, has the advantages of moisture absorption and breathability, antibacterial properties, and high strength. However, pure ramie fabric has problems such as high rigidity, rough hand feel, and easy wrinkling. Wool fiber, on the other hand, has the characteristics of softness, warmth, and good elasticity. However, pure wool fabric is prone to felting and shrinkage, and the dyeing process is energy-intensive and easily causes environmental pollution. Currently, while ramie and wool blends can complement each other's properties to some extent, the compatibility between ramie and wool fibers in existing blends is poor, leading to fiber separation and insufficient fabric stability. Furthermore, traditional dyeing and finishing processes often employ chemical dyes and auxiliaries, which not only pollute the environment but also pose a risk of harmful residues, failing to meet environmental protection requirements. Therefore, developing a high-performance, environmentally friendly, and sustainable renewable ramie / wool blend fabric and its dyeing and finishing process is of great significance. Summary of the Invention

[0003] The purpose of this invention is to provide a renewable ramie fiber / wool blended fabric and its environmentally friendly dyeing and finishing process, aiming to solve the technical problems of poor compatibility and insufficient stability of existing ramie / wool blended fabrics, as well as the high pollution and energy consumption of traditional dyeing and finishing processes.

[0004] To achieve the above objectives, the present invention provides a renewable ramie fiber / wool blended fabric, which, by weight percentage, comprises the following components: 30%-50% renewable ramie fiber, 25%-40% wool fiber, 15%-30% regenerated cellulose fiber, and 0.5%-3% functional additives; the renewable ramie fiber is made from recycled ramie products through crushing, degumming, and combing, with a fiber length of 25-35mm and a fineness of 1.2-1.8 dtex; the functional additives consist of 0.3%-2% antibacterial agent and 0.2%-1% anti-wrinkle agent.

[0005] Preferably, the wool fiber has a fineness of 16-22μm and has been degreased and impurity removed; the regenerated cellulose fiber is Lyocell fiber or Modal fiber, with a fineness of 1.0-1.5dtex and a length of 30-40mm; the antibacterial agent is nano zinc oxide or chitosan, and the anti-wrinkle agent is citrate ester.

[0006] A method for preparing a renewable ramie fiber / wool blended fabric as described above includes the following steps: (1) Fiber pretreatment: Soak renewable ramie fiber, wool fiber and regenerated cellulose fiber in deionized water at 60-80℃ for 30-60 min respectively; add functional additives to deionized water and stir evenly, put the above three types of fibers in, and ultrasonically treat at 40-50℃ with 300W power for 20-30 min; then dry at 80-90℃ for 2-3 h, and control the moisture content of the fibers after drying to 8%-10%; (2) Spinning: The three pretreated fibers are mixed in proportion, combed into cotton slivers through a combing and cleaning process, and then processed through three drawing, roving and spinning processes to produce yarn with a strength of 18-28 tex and a breaking strength of ≥2.5 cN / dtex. (3) Weaving: The yarn is woven into a plain or twill fabric using an air-jet loom. The weaving speed is 300-400 r / min, the weaving tension is controlled at 150-200 N, the fabric width is 150 cm, the warp density is 280-350 threads / 10 cm, and the weft density is 260-300 threads / 10 cm.

[0007] An environmentally friendly dyeing and finishing process for renewable ramie fiber / wool blended fabrics, as described above, includes three stages: pretreatment, dyeing, color fixing, and finishing. The specific steps are as follows: (1) Pretreatment: ① Desizing: Desizing is performed using amylase at a concentration of 2-5 g / L. The pH of the treatment solution is adjusted to 6.0-7.0, and the solution is treated at 50-60℃ for 40-60 min. Then, it is washed 2-3 times with hot water at 60-70℃. ② Scouring: Alkaline scouring is adopted. The scouring solution consists of 1-3g / L sodium carbonate, 0.5-1.5g / L surfactant and deionized water. The pH is adjusted to 8.0-9.0 and treated at 80-90℃ for 30-50 minutes. Then, it is washed with room temperature water until the pH of the fabric is neutral. ③ Bleaching: Use hydrogen peroxide for bleaching. The concentration of hydrogen peroxide in the bleaching solution is 5-8 g / L, the stabilizer is 1-2 g / L, and the pH is adjusted to 10.0-11.0. Treat at 80-90℃ for 40-60 min, then pickle with 1-2 g / L hydrochloric acid, and then wash with water until the whiteness of the fabric reaches 80-85%. (2) Dyeing: Use natural plant dyes for dyeing. The dye concentration is 8-15% owf. Add 2-5g / L of aluminum sulfate mordant and 0.3-0.8g / L of penetrant to the dyeing bath. The bath ratio is 1:20-1:30. First, raise the temperature of the dyeing bath to 50-60℃ and keep it for 10-15min. Then, raise the temperature to 80-85℃ at a rate of 1-2℃ / min and keep it for 30-50min. Finally, let it cool down naturally to below 40℃. Take out the fabric and wash it with clean water 2-3 times. (3) Color fixing and finishing: ① Fixing: Use a formaldehyde-free fixing agent with a concentration of 3-5 g / L, adjust the pH to 6.0-7.0, treat at 50-60℃ for 20-30 min, and then wash with water until no fixing agent residue remains; ② Softening treatment: Use an eco-friendly softener at a concentration of 2-4 g / L, treat at 40-50℃ for 15-25 min, then centrifuge to dehydrate until the moisture content of the fabric is ≤60%; ③ Setting: A hot air setting machine is used, with a setting temperature of 120-140℃, a setting time of 10-20s, and a setting tension of 50-80N. The finished fabric is obtained by cooling to room temperature.

[0008] Preferably, the natural plant dye is turmeric dye, madder dye, or indigo dye; the surfactant is fatty alcohol polyoxyethylene ether; the penetrant is polyoxyethylene lauryl ether; the eco-friendly softener is polysiloxane; the stabilizer is sodium silicate; and the formaldehyde-free fixing agent is polyamide epichlorohydrin resin.

[0009] Preferably, the dyeing process has an energy consumption of ≤3.5kWh / kg fabric, a COD value of dyeing wastewater of ≤400mg / L, and no formaldehyde residue in the finished fabric.

[0010] Preferably, in the fiber pretreatment step, the distribution deviation of the functional additives on the fiber surface after ultrasonic treatment is ≤8%.

[0011] Therefore, the renewable ramie fiber / wool blended fabric and its environmentally friendly dyeing and finishing process of the present invention have the following beneficial effects: (1) Significantly optimized fabric performance: It solves the problems of poor compatibility and insufficient stability of traditional ramie / wool blends. By combining renewable ramie, wool and regenerated cellulose fibers, and adding antibacterial and anti-wrinkle agents, the fabric has an antibacterial rate (Escherichia coli / Staphylococcus aureus) ≥90%, an anti-wrinkle recovery angle (warp + weft) ≥280°, a color fastness (washing resistance / friction resistance) ≥4, a breaking strength ≥280N, an air permeability ≥82mm / s, and a moisture absorption rate ≥13.8%, taking into account both functionality and practicality.

[0012] (2) Outstanding advantages in environmental protection and energy consumption: The dyeing and finishing process adopts biological enzyme desizing, natural plant dyeing, and formaldehyde-free color fixing. The COD of dyeing wastewater is ≤400mg / L, and no formaldehyde is detected in the finished product, thus avoiding chemical pollution. The dyeing process uses medium and low temperature dyeing (80-85℃) and short time setting (10-20s), with dyeing energy consumption ≤3.5kWh / kg of fabric, which is more than 40% lower than the energy consumption of traditional processes.

[0013] (3) High production and application value: The fabric has a high proportion of renewable components, with ramie + regenerated cellulose fiber ≥45%, which is in line with the concept of sustainability; the preparation and dyeing and finishing process parameters are stable, making it easy to scale up production and meet the environmental protection and high performance requirements of the textile industry such as clothing.

[0014] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0015] The technical solution of the present invention will be further described below through embodiments.

[0016] To make the objectives, technical solutions, and advantages of this application clearer, more thorough, and more complete, the technical solutions of the present invention are clearly and completely described below through embodiments. The following detailed descriptions are all illustrations of embodiments, intended to provide further detailed explanations of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0017] The instruments, equipment, reagents, and materials used in the examples were all obtained commercially.

[0018] Example 1 A renewable ramie fiber / wool blend fabric comprises: 40% renewable ramie fiber, 30% wool fiber, 29% Lyocell fiber, 0.6% nano zinc oxide antibacterial agent, and 0.4% citrate ester anti-wrinkle agent.

[0019] Renewable ramie fiber is made from recycled ramie products through crushing, degumming, and combing. It has a length of 28mm and a fineness of 1.5dtex. Wool fiber is made from fine wool with a fineness of 18μm. It is degreased and impurity removed to remove surface grease and impurities. Lyocell fiber is a regenerated cellulose fiber with a fineness of 1.2dtex and a length of 35mm.

[0020] A method for preparing a renewable ramie fiber / wool blended fabric, comprising: (1) Fiber pretreatment: ① Soak renewable ramie, wool fiber, and Lyocell fiber together in 70℃ deionized water for 45 minutes to remove dust and trace impurities attached to the surface.

[0021] ② Add nano zinc oxide antibacterial agent and citrate anti-wrinkle agent to deionized water, stir until completely dissolved, then put the pretreated fiber into the solution and sonicate at 300W power for 25 minutes at 45℃ to ensure that the additives are evenly attached to the fiber surface.

[0022] ③ Place the ultrasonically treated fibers in an 85℃ forced-air drying oven and dry for 2.5 hours, controlling the moisture content of the dried fibers to be 8%-10%.

[0023] (2) Spinning: ① Combing and cleaning process: The pretreated mixed fibers are fed into the combing and cleaning equipment and combed into uniform slivers at a combing speed of 300r / min; ② Drawing: A three-stage drawing process is adopted with a roller speed of 200m / min to improve the uniformity of the fiber sliver; ③ Roving: Roving is processed with a twist coefficient of 80 to form roving strips; ④ Fine yarn: Fine yarn is produced with a twist coefficient of 380 to make 22tex yarn, ensuring that the yarn breaking strength is ≥2.8cN / dtex.

[0024] (3) Weaving: Use a JAT810 air-jet loom with a plain weave structure. Set the weaving speed to 350 r / min and the weaving tension to 180 N. Weave a greige fabric with a width of 150 cm and control the warp density to 320 ends / 10 cm and the weft density to 280 ends / 10 cm.

[0025] A dyeing and finishing process for a renewable ramie fiber / wool blend fabric includes: (1) Desizing: Adjust the pH of the 3g / L amylase solution to 6.5, immerse the fabric in the amylase solution at 55℃ for 50min, wash twice with 70℃ hot water for 10min each time to remove the sizing agent.

[0026] (2) Scouring: Prepare a scouring solution with a concentration of 2 g / L sodium carbonate and 1 g / L fatty alcohol polyoxyethylene ether, and adjust the pH to 8.5. Soak the desized fabric in the scouring solution at 85°C for 40 min, and then wash it with water at room temperature until the pH of the fabric is neutral.

[0027] (3) Bleaching: Prepare a bleaching solution with 6g / L hydrogen peroxide and 1.5g / L sodium silicate, and adjust the pH to 10.5. Soak the refined fabric in the bleaching solution at 85℃ for 50 minutes, then wash with 1.5g / L hydrochloric acid, and then wash with water to remove residual chemicals.

[0028] (4) Natural dye dyeing: Prepare a dyeing bath with 12% owf turmeric dye, 3g / L aluminum sulfate and 0.5g / L polyoxyethylene lauryl ether, and dye at a bath ratio of 1:25.

[0029] During the staining process, the temperature was first maintained at 55℃ for 12 minutes, then increased to 82℃ at a rate of 1.5℃ / min, and maintained at that temperature for 40 minutes. Afterward, the temperature was allowed to cool naturally to below 40℃, and the stain was rinsed twice with clean water.

[0030] (5) Fixing: Prepare 4g / L formaldehyde-free fixing agent (polyamide epichlorohydrin resin), adjust pH to 6.5; immerse the dyed fabric in the formaldehyde-free fixing agent at 55℃ for 25min, and wash with water to remove residual fixing agent.

[0031] (6) Softening finishing: Prepare 3g / L of polysiloxane softener, soak the color-fixed fabric at 45℃ for 20min; centrifuge to dehydrate, and control the moisture content to ≤60%.

[0032] (7) Setting: Set the dehydrated fabric at 130℃ for 15s with a tension of 80N. Allow it to cool naturally to room temperature to obtain the finished product.

[0033] Example 2 A renewable ramie fiber / wool blend fabric comprises: 35% renewable ramie fiber, 35% wool fiber (18μm fineness, degreased and impurity removed), 28.5% Modal fiber (1.2dtex fineness, 35mm length), 2% chitosan antibacterial agent, 1.0% citrate anti-wrinkle agent.

[0034] Renewable ramie fiber is made from recycled ramie products through crushing, degumming, and combing. It has a length of 25mm and a fineness of 1.4dtex. Wool fiber is made from fine wool with a fineness of 16μm. It is degreased and impurities are removed from the surface. Modal fiber is regenerated cellulose fiber with a fineness of 1.1dtex and a length of 32mm.

[0035] A method for preparing a renewable ramie fiber / wool blended fabric, comprising: (1) Fiber pretreatment: ① Soak renewable ramie, wool fiber, and Modal fiber together in deionized water at 65℃ for 50 minutes to remove dust and trace impurities attached to the surface.

[0036] ② Add nano zinc oxide antibacterial agent and citrate anti-wrinkle agent to deionized water, stir until completely dissolved, then put the pretreated fiber into the solution and sonicate at 300W power for 28 minutes at 42℃ to ensure that the additives are evenly attached to the fiber surface.

[0037] ③ Place the ultrasonically treated fibers in an 82℃ forced-air drying oven and dry for 2.8 hours, controlling the moisture content of the dried fibers to be 8%-10%.

[0038] (2) Spinning, the steps are the same as in Example 1, to produce 25tex yarn with a breaking strength ≥2.6cN / dtex.

[0039] (3) Weaving: Use a JAT810 air-jet loom with a plain weave structure. Set the weaving speed to 320r / min and the weaving tension to 160N. Weave a greige fabric with a width of 150cm and control the warp density to 300 ends / 10cm and the weft density to 260 ends / 10cm.

[0040] A dyeing and finishing process for a renewable ramie fiber / wool blend fabric includes: (1) Desizing: Adjust the pH of the 4g / L amylase solution to 6.2, immerse the fabric in the amylase solution at 52℃ for 55min, wash twice with 70℃ hot water for 10min each time to remove the sizing agent.

[0041] (2)-(3) are the same as in Example 1.

[0042] (4) Natural dye dyeing: Prepare a dyeing bath with 10% owf madder dye, 4 g / L aluminum sulfate and 0.5 g / L polyoxyethylene lauryl ether, and dye at a bath ratio of 1:22.

[0043] During the staining process, the temperature was first maintained at 52℃ for 12 minutes, then increased to 80℃ at a rate of 1.2℃ / min, and maintained at that temperature for 45 minutes. Afterward, the temperature was allowed to cool naturally to below 40℃, and the stain was rinsed twice with clean water.

[0044] (5)-(6) are the same as in Example 1.

[0045] (7) Setting: Set the dehydrated fabric at 125℃ for 18s with a tension of 80N. Allow it to cool naturally to room temperature to obtain the finished product.

[0046] Example 3 A renewable ramie fiber / wool blend fabric comprises: 50% renewable ramie fiber, 25% wool fiber (18μm fineness, degreased and impurity removed), 24% Lyocell fiber (1.2dtex fineness, 35mm length), 2% chitosan antibacterial agent, 0.5% citrate anti-wrinkle agent.

[0047] Renewable ramie fiber is made from recycled ramie products through crushing, degumming, and combing. It has a length of 30mm and a fineness of 1.8dtex. Wool fiber is made from fine wool with a fineness of 22μm. It is degreased and impurity removed to remove surface grease and impurities. Lyocell fiber is a regenerated cellulose fiber with a fineness of 1.5dtex and a length of 38mm.

[0048] A method for preparing a renewable ramie fiber / wool blended fabric, comprising: (1) Fiber pretreatment: ① Soak renewable ramie, wool fiber, and Lyocell fiber together in 80℃ deionized water for 30 minutes to remove dust and trace impurities attached to the surface.

[0049] ② Add nano zinc oxide antibacterial agent and citrate anti-wrinkle agent to deionized water, stir until completely dissolved, then put the pretreated fiber into the solution and sonicate at 300W power for 20 minutes at 50℃ to ensure that the additives are evenly attached to the fiber surface.

[0050] ③ Place the ultrasonically treated fibers in a 90℃ forced-air drying oven and dry for 2 hours, controlling the moisture content of the dried fibers to be 8%-10%.

[0051] (2) Spinning, the steps are the same as in Example 1, to make 18tex yarn, ensuring that the yarn breaking strength is ≥2.5cN / dtex.

[0052] (3) Weaving: Use a JAT810 air-jet loom with a 3 / 1 right twill weave, a weaving speed of 400 r / min and a tension of 200 N; weave a greige fabric with a width of 150 cm, and control the warp density of the greige fabric to be 350 ends / 10 cm and the weft density to be 300 ends / 10 cm.

[0053] A dyeing and finishing process for a renewable ramie fiber / wool blend fabric includes: (1) Desizing: Adjust the pH of the 5g / L amylase solution to 6.8, immerse the fabric in the amylase solution at 60℃ for 50min, wash twice with 70℃ hot water for 10min each time to remove the sizing agent.

[0054] (2)-(3) are the same as in Example 1.

[0055] (4) Natural dye dyeing: Prepare a dyeing bath with 15% owf indigo dye, 5 g / L aluminum sulfate and 0.5 g / L polyoxyethylene lauryl ether, and dye at a bath ratio of 1:30.

[0056] During the staining process, first maintain the temperature at 60℃ for 10 minutes, then increase the temperature to 85℃ at a rate of 2℃ / min, and maintain the temperature for 30 minutes after reaching the target temperature. Then allow it to cool naturally to below 40℃ and rinse twice with clean water.

[0057] (5)-(6) are the same as in Example 1.

[0058] (7) Setting: Set the dehydrated fabric at 140℃ for 10s with a tension of 80N. Allow it to cool naturally to room temperature to obtain the finished product.

[0059] Comparative Example 1 A renewable ramie fiber / wool blended fabric comprises 50% renewable ramie fiber and 50% wool fiber, with the same parameters as in Example 1, and the same preparation and dyeing and finishing processes as in Example 1.

[0060] Comparative Example 2 A renewable ramie fiber / wool blended fabric, with the same composition and preparation method as Example 1, differs in its dyeing and finishing process, as follows: (1) Desizing: Prepare a treatment solution with 5g / L sodium hydroxide and 3g / L sodium dodecylbenzenesulfonate. Place the fabric in the treatment solution at 95℃ and boil for 60 minutes. Wash with cold water 3 times for 10 minutes each time to remove the sizing.

[0061] (2)-(3) are the same as in Example 1, wherein the refined surfactant is sodium dodecylbenzenesulfonate.

[0062] (4) Dyeing: Prepare a dyeing bath with 8% owf direct lightfast yellow G and 10g / L food grade sodium chloride, adjust the pH to 7.0, dye the fabric at 95℃ and keep it warm for 60 minutes, and then wash and fix the color with water.

[0063] (5) Color fixing: Prepare a 5g / L formaldehyde color fixing agent, immerse the dyed fabric in the color fixing agent at 80℃ for 30min, and then soften and finish after washing.

[0064] (6) The softening method is the same as in Example 1.

[0065] (7) Setting: Set the dehydrated fabric at 160℃ for 30s with a tension of 80N. Allow it to cool naturally to room temperature to obtain the finished product.

[0066] Comparative Example 3 A renewable ramie fiber / wool blended fabric has the same composition and dyeing and finishing process as Example 1, except that the preparation method is different: the ultrasonic treatment process is omitted, and the fiber and auxiliary agent are directly mixed and then put into the drying process, while the parameters of the other steps remain unchanged.

[0067] Test Example 1 Example 1-3 Core performance tests include: ① Antibacterial rate: GB / T 20944.3-2008, shaking method, test for Escherichia coli / Staphylococcus aureus, shake at 20℃ for 2h.

[0068] ② Wrinkle recovery angle: GB / T 3819-2017, wrinkle recovery angle tester, measure the warp / weft elastic recovery angle and take the sum.

[0069] ③ Color fastness: Wash fastness (GB / T 3921-2008, Grade 4), Abrasion fastness (GB / T 3920-2008, 9N pressure).

[0070] ④ Breaking strength: GB / T 3923.1-2013, tensile testing machine, specimen width 50mm, speed 100mm / min.

[0071] ⑤ Moisture absorption rate: GB / T 21655.1-2008, at 20℃ and 65% humidity, measure the ratio of moisture absorption to dry weight over 24 hours.

[0072] ⑥ Air permeability: GB / T 5453-2017, air permeability tester, pressure difference 100Pa.

[0073] ⑦ Abrasion resistance: GB / T 21196.2-2007, Martindale tester, 12kPa pressure, measured the number of friction cycles before failure.

[0074] ⑧ Feel rating: 5 people blindly evaluate, 5 points (smooth) - 1 point (stiff), take the average.

[0075] The test results are shown in Table 1 below: Table 1. Core performance test results of Examples 1-3

[0076] As shown in Table 1, (1) Antibacterial performance: Example 2 has the highest antibacterial rate, while Example 3 has a slightly lower rate, indicating that the amount of antibacterial agent used is positively correlated with the effect. Furthermore, both nano zinc oxide and chitosan can achieve an antibacterial rate of ≥89%, which can meet different needs.

[0077] (2) Anti-wrinkle performance: The recovery angle of Example 1 was 290°. In Example 2, the recovery angle was slightly lower because the Modal fiber anti-wrinkle base was weaker than Lyocell. Example 3 also followed the trend of slightly lower anti-wrinkle performance due to reduced anti-wrinkle agent dosage.

[0078] (3) Structural performance: Example 3 uses a twill weave, which has significantly better air permeability and abrasion resistance than plain weave examples 1-2, confirming the excellent air permeability and abrasion resistance of twill. At the same time, due to the fine yarn and high proportion of ramie, the breaking strength is slightly lower, which is a reasonable structural balance.

[0079] (4) Moisture absorption and hand feel: Example 2 had the highest moisture absorption rate of 15.1%, while Example 3 had a hand feel score of 4.0, but still met the "softness standard".

[0080] Test Example 2 Performance and environmental impact comparison of Example 1 with Comparative Examples 1-3: The test contents are as follows: ①Formaldehyde residue: GB / T 2912.1-2009, acetylacetone spectrophotometry.

[0081] ② COD of dyeing wastewater: GB / T 11914-1989, potassium dichromate method.

[0082] ③ Dyeing energy consumption: Use an electrical parameter tester to record the total electricity consumption for dyeing and calculate the energy consumption per unit (kWh / kg).

[0083] ④ Antibacterial agent distribution deviation: EDS energy dispersive spectrometer is used to measure the concentration of auxiliary elements on the fiber surface and calculate the maximum / average concentration deviation rate.

[0084] ⑤ Fabric color difference: GB / T 7921-2008, color difference meter, measure the maximum value of CIE LAB ΔE.

[0085] ⑥ Other performance characteristics: Same as test example 1.

[0086] The test results are shown in Table 2: Table 2. Performance and environmental impact comparison results between Example 1 and Comparative Examples 1-3

[0087] Table 2 shows that Comparative Example 1, without regenerated cellulose fiber, has a 11%-10% lower breaking strength, a 19% lower moisture absorption rate, and a 33% lower hand feel compared to water-cooled Example 1, demonstrating the role of regenerated cellulose fiber in improving strength, moisture absorption, and softness. Without functional additives, the antibacterial rate is only 49%-46% of Example 1, and the wrinkle recovery angle is 19% lower, but it retains 45% / 42% of the antibacterial rate. Comparative Example 2 has a formaldehyde residue of 65 mg / kg, a COD value 2.6 times that of Example 1, and 72% higher dyeing energy consumption. It also has a lower wet rubbing color fastness (grade 1 lower) and a 12% lower air permeability, highlighting the dual advantages of environmental protection and performance of Example 1. Comparative Example 3 omits ultrasonic pretreatment, resulting in a 25% deviation in antibacterial agent distribution (Example 1 ≤ 5%), leading to color difference. With an E=2.5, a 10% lower wrinkle recovery angle, and a 19% lower abrasion resistance, the ultrasonic treatment confirms its crucial role in ensuring the uniformity and stability of the additives. Furthermore, the lack of difference in moisture absorption indicates that this step only affects the adhesion of the additives.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A renewable ramie fiber / wool blended fabric, characterized in that, By mass percentage, consisting of: renewable ramie fiber 30%-50%, wool fiber 25%-40%, regenerated cellulose fiber 15%-30%, functional additives 0.5%-3%; renewable ramie fiber is made of recycled ramie products by crushing, degumming, carding, fiber length is 25-35mm, fineness is 1.2-1.8dtex; functional additives consist of 0.3%-2% antibacterial agent and 0.2%-1% anti-wrinkle agent.

2. The renewable ramie fiber / wool blended fabric according to claim 1, characterized in that: The fineness of the wool fiber is 16-22μm, and is subjected to degreasing and impurity removal treatment; the regenerated cellulose fiber is Lyocell fiber or Modal fiber, the fineness of the regenerated cellulose fiber is 1.0-1.5dtex, and the length is 30-40mm; the antibacterial agent is nano zinc oxide or chitosan, and the anti-wrinkle agent is citric acid ester.

3. A method of manufacturing the renewable ramie fiber / wool blended fabric according to claim 1 or 2, characterized in that, It comprises the following steps: (1) fiber pretreatment: the renewable ramie fiber, wool fiber and regenerated cellulose fiber are respectively soaked in deionized water at 60-80℃ for 30-60min; the functional additives are added into the deionized water and stirred uniformly, and then the three kinds of fibers are put into the deionized water and subjected to ultrasonic treatment at 40-50℃ and 300W power for 20-30min; then the fibers are dried at 80-90℃ for 2-3h, and the water content of the fibers after drying is controlled to be 8%-10%; (2) spinning: the pretreated three kinds of fibers are mixed in proportion, carded into slivers through the carding process, and then subjected to 3 passes of drawing, roving and spinning processes to produce yarns with 18-28tex, and the breaking strength of the yarns is ≥2.5cN / dtex; (3) weaving: the yarns are woven into gray cloth of plain or twill weave by using an air jet loom, the weaving speed is 300-400r / min, the weaving tension is controlled to be 150-200N, the width of the gray cloth is 150cm, the warp density is 280-350 roots / 10cm, and the weft density is 260-300 roots / 10cm.

4. An eco-friendly dyeing and finishing process of the renewable ramie fiber / wool blended fabric as claimed in claim 1 or 2, wherein, It comprises three stages of pretreatment, dyeing, color fixing and finishing, and the specific steps are as follows: (1) pretreatment: ① desizing: starch enzyme is used for desizing, the concentration of the starch enzyme is 2-5g / L, the pH of the treatment solution is adjusted to 6.0-7.0, the treatment is carried out at 50-60℃ for 40-60min, and then the gray cloth is washed with hot water at 60-70℃ for 2-3 times; ② scouring: alkali scouring is used, the scouring solution is composed of sodium carbonate 1-3g / L, surfactant 0.5-1.5g / L and deionized water, the pH is adjusted to 8.0-9.0, the treatment is carried out at 80-90℃ for 30-50min, and then the gray cloth is washed with normal temperature water until the pH of the gray cloth is neutral; ③ bleaching: hydrogen peroxide bleaching is used, the concentration of hydrogen peroxide in the bleaching solution is 5-8g / L, the stabilizer is 1-2g / L, the pH is adjusted to 10.0-11.0, the treatment is carried out at 80-90℃ for 40-60min, and then the gray cloth is washed with 1-2g / L hydrochloric acid, and then washed with water until the whiteness of the gray cloth reaches 80-85%; (2) dyeing: natural plant dyes are used for dyeing, the dye concentration is 8-15% o.w.f, 2-5 g / L of aluminum sulfate mordant and 0.3-0.8 g / L of penetrant are added into the dye bath, the bath ratio is 1:20-1:30; the dyeing bath is first heated to 50-60℃ and kept for 10-15 min, then heated to 80-85℃ at a rate of 1-2℃ / min and kept for 30-50 min, finally naturally cooled to below 40℃, and the gray fabric is taken out and washed with water for 2-3 times; (3) fixation and post-finishing: ① fixation: formaldehyde-free fixing agent is used, the fixing agent concentration is 3-5 g / L, the pH is adjusted to 6.0-7.0, and the treatment is carried out at 50-60℃ for 20-30 min, and then washed until no fixing agent is left; ② soft finishing: ecological softener is used, the softener concentration is 2-4 g / L, and the treatment is carried out at 40-50℃ for 15-25 min, and then centrifuged to a moisture content of ≤60% in the gray fabric; ③ setting: hot air setting machine is used, the setting temperature is 120-140℃, the setting time is 10-20 s, the setting tension is controlled at 50-80 N, and the finished fabric is obtained after cooling to room temperature.

5. The eco-friendly dyeing and finishing process as claimed in claim 4, wherein: The natural plant dyes are turmeric dye, madder dye or indigo dye; the surfactant is fatty alcohol polyoxyethylene ether, the penetrant is polyoxyethylene lauryl ether, the ecological softener is polysiloxane, the stabilizer is sodium silicate, and the formaldehyde-free fixing agent is polyamide epoxy chloropropane resin.

6. The eco-friendly dyeing and finishing process as claimed in claim 4, wherein: The energy consumption of the dyeing process of the process is ≤3.5 kWh / kg of fabric, the COD value of the dyeing wastewater is ≤400 mg / L, and the formaldehyde residual amount in the finished fabric is not detected.

7. The method of claim 3, wherein: In the fiber pretreatment step, the distribution deviation of the functional additives on the fiber surface after ultrasonic treatment is ≤8%.

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