Blended fabric based on bio-based renewable fibers and production method thereof

Abstract

The invention discloses a bio-based renewable fiber-based blended fabric and a production method thereof, and belongs to the technical field of functional textile materials. The blended fabric is formed by blending 30%-50% of bio-based polylactic acid fibers, 30%-40% of Lyocell fibers and 20%-30% of recycled wool fibers. The production method comprises the steps of fiber blended spinning, weaving and after-finishing, wherein the after-finishing sequentially adopts cellulase and protease composite biological treatment, low-temperature washing at the temperature of less than or equal to 40 DEG C and low-temperature tentering setting at the temperature of 110-125 DEG C. The whole production process is green and environment-friendly, the obtained fabric has excellent mechanical properties, pilling resistance, dimensional stability and comfortable hand feeling, and unification of resource recycling and high performance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional textile materials, in particular to a blended fabric based on bio-based renewable fibers and a production method thereof. BACKGROUND

[0002] Traditional woolen fabric is mainly made of raw wool, which has excellent warmth retention and luxury, but there are many environmental challenges in its production process. Sheep farming involves a large amount of land, water resources and methane emissions, and the processing of raw wool also consumes a lot of energy. In addition, with the rise of fast fashion, textile waste has increased sharply, and how to realize the recycling of resources has become a key problem. On the other hand, although traditional chemical blended fabric (such as polyester / wool blended fabric) can improve durability and wrinkle resistance, the raw material polyester is derived from non-renewable petroleum resources and is difficult to biodegrade, which can easily cause microplastic pollution. In the fabric finishing process, traditional processes usually use high temperature, strong alkali and strong oxidizing agents for treatment, which has problems such as high energy consumption, chemical reagent residue and wastewater pollution.

[0003] With the in-depth understanding of the concept of sustainable development around the world, it has become an urgent need of the industry to develop textiles derived from renewable resources, biodegradable and clean and environmentally friendly production process. Bio-based polylactic acid (PLA) fiber is derived from crops such as corn and cassava, and its waste can be completely biodegraded into carbon dioxide and water, making it an ideal substitute for petroleum-based fibers. Lyocell fiber is a new type of green regenerated cellulose fiber, and the NMMO solvent used in its production has a recyclability of more than 99%, and is non-toxic and harmless. However, the two fibers have large performance differences, and how to blend them through scientific ratio design and mild processing technology to make the most of their complementary advantages and produce high-performance woolen blended fabric is a key problem that needs to be solved at present. SUMMARY

[0004] The purpose of the present application is to provide a blended fabric based on bio-based renewable fibers and a production method thereof, which solves the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides a production method of a blended fabric based on bio-based renewable fibers, which specifically comprises the following steps: (1) Fiber mixing and spinning: mixing bio-based polylactic acid fiber, Lyocell fiber and recycled wool fiber, and making yarn through the processes of opening and cleaning, carding, drawing, roving and spinning; (2) Weaving: interweaving the yarn made in step (1) as warp and weft to make a blended gray fabric; (3) Finishing: sequentially treating the blended gray fabric made in step (2) with bio-enzyme, low-temperature scouring and low-temperature tentering and setting to obtain the target blended fabric.

[0006] Preferably, in step (1), the bio-based polylactic acid fiber is 30%-50%, the Lyocell fiber is 30%-40%, and the recycled wool fiber is 20%-30% by weight percentage.

[0007] Preferably, in step (1), the bio-based polylactic acid fiber has a fineness of 1.2-1.8D and a length of 70-90mm.

[0008] Preferably, in step (1), the Lyocell fiber is a regenerated cellulose fiber produced by N-methyl morpholine-N-oxide solvent method, has a fineness of 1.0-1.5D and a length of 38-45mm.

[0009] Preferably, in step (1), the recycled wool fiber has a fineness of 3.0-5.0D and an average length of 35-55mm.

[0010] Preferably, in step (3), the bio-enzyme treatment uses a composite enzyme of cellulase and protease, the treatment temperature is 45-55℃, the treatment time is 40-60 minutes, and the pH value is 5.0-6.0.

[0011] Preferably, in step (3), the low-temperature scouring uses a biodegradable surfactant containing alkyl glycoside, and the temperature is ≤40℃.

[0012] Preferably, the temperature of the low-temperature drawing and setting is 110-125℃.

[0013] The application also provides a bio-based renewable fiber-based blended fabric produced by any one of the above production methods.

[0014] The present application realizes the unity of fabric performance and environmental protection property through the gradient complementation of fiber function and the mild and accurate finishing process. Among them, the bio-based polylactic acid fiber as the skeleton fiber provides the skeleton and crispness and wrinkle resistance of the fabric, and its low melting point (about 165℃) determines that the finishing must be carried out at low temperature; the Lyocell fiber as the reinforcing and softening fiber uses its high strength and silk-like luster to improve the strength and drape of the fabric, and makes up for the disadvantage of insufficient strength of the recycled wool; the recycled wool fiber as the functional and tactile fiber gives the fabric the classic wool feel, warmth and moisture permeability. In the finishing process, the composite enzyme of cellulase and protease is used for biological enzyme treatment, the cellulase can hydrolyze the microfibril on the surface of the Lyocell fiber, so that the fabric becomes soft, the luster is better and the pilling is reduced; the protease can decompose the scales and impurities on the surface of the recycled wool fiber, so that the hand feeling is soft and the itching feeling is reduced. The treatment process is carried out at mild pH and low temperature, has high selectivity and will not damage the fiber body. The low-temperature fulling and setting process controls the temperature throughout the process, matches the heat resistance limit of polylactic acid fiber and wool fiber, avoids fiber heat damage, yellowing or shrinkage deformation, and uses alkyl polyglycoside (APG) biodegradable surfactant to ensure the environmental friendliness of the washing process.

[0015] Therefore, the present application provides a blended fabric based on bio-based renewable fibers and a production method thereof, which has the following beneficial effects: (1) The present application runs through the concept of green environmental protection from raw material selection to the whole production process. First, the main components of the fabric, bio-based polylactic acid fiber and Lyocell fiber, are derived from renewable resources, and the application of recycled wool fiber effectively reduces textile waste and realizes the recycling of resources. Second, the finishing process abandons the traditional high-energy consumption and high-pollution process, uses low-temperature biological enzyme treatment and biodegradable detergent, greatly reduces the consumption of water, energy and chemical residues, significantly reduces the carbon footprint of the whole production process, and meets the core requirements of sustainable development of modern textile industry.

[0016] (2) The present application realizes the unity of fabric performance and environmental protection property through the gradient complementation of fiber function and the mild and accurate finishing process. Among them, the bio-based polylactic acid fiber as the skeleton fiber provides the skeleton and crispness and wrinkle resistance of the fabric, and its low melting point (about 165℃) determines that the finishing must be carried out at low temperature; the Lyocell fiber as the reinforcing and softening fiber uses its high strength and silk-like luster to improve the strength and drape of the fabric, and makes up for the disadvantage of insufficient strength of the recycled wool; the recycled wool fiber as the functional and tactile fiber gives the fabric the classic wool feel, warmth and moisture permeability. In the finishing process, the composite enzyme of cellulase and protease is used for biological enzyme treatment, the cellulase can hydrolyze the microfibril on the surface of the Lyocell fiber, so that the fabric becomes soft, the luster is better and the pilling is reduced; the protease can decompose the scales and impurities on the surface of the recycled wool fiber, so that the hand feeling is soft and the itching feeling is reduced. The treatment process is carried out at mild pH and low temperature, has high selectivity and will not damage the fiber body. The low-temperature fulling and setting process controls the temperature throughout the process, matches the heat resistance limit of polylactic acid fiber and wool fiber, avoids fiber heat damage, yellowing or shrinkage deformation, and uses alkyl polyglycoside (APG) biodegradable surfactant to ensure the environmental friendliness of the washing process.

[0017] The technical solutions of the present application will be further described in detail through the following examples. DETAILED DESCRIPTION

[0018] The application will be further described in connection with the specific embodiments. It should be understood that the embodiments are only used for illustrating the application but not for limiting the scope of the application. Any change, modification, substitution, combination, simplification made without departing from the spirit and principle of the application shall be equivalent replacements and shall be included in the protection scope of the application. In addition, it should be understood that after reading the content of the application, those skilled in the art can make various changes or modifications to the application, and these equivalent forms shall be within the scope defined by the appended claims and shall be within the protection scope of the application.

[0019] Reference to "an embodiment" or "the embodiment" in this text means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to a particular embodiment at all. In principle, in this application, each technical feature mentioned in each embodiment can be combined in any manner without technical contradiction or conflict to form a corresponding implementable technical solution.

[0020] Unless otherwise defined, the meanings of the technical terms used in this text are the same as those commonly understood by those skilled in the art to which this application belongs; the use of related terms in this text is only for the purpose of describing specific embodiments and is not intended to limit the application.

[0021] Unless otherwise specified, the reagents, instruments, and equipment used in the application are the reagents, instruments, and equipment commonly used by those skilled in the art; the test standards use national standards or international standards.

[0022] Example 1 This embodiment provides a production method of a blended fabric based on bio-based renewable fibers, and the fiber ratio is: bio-based PLA fiber 40%, Lyocell fiber 35%, and recycled wool fiber 25%. The production process specifically includes the following steps: (1) Fiber mixing and spinning: according to the above ratio, PLA fibers with a fineness of 1.5D and a length of 80mm, Lyocell fibers with a fineness of 1.3D and a length of 40mm, and recycled wool fibers with an average fineness of 4.0D and an average length of 45mm are mixed according to the ratio, and then after the processes of opening and cleaning, carding (carding machine cylinder speed 300rpm), drawing (three passes), roving (twist factor 58), and spinning (spindle speed 11000rpm, twist factor 380), 40 English-spun blended yarns are spun.

[0023] (2) Weaving: The above yarns were respectively used as warp and weft yarns to weave the grey cloth on a rapier loom in 2 / 2 twill weave, with a warp density x weft density of 280 roots / 10 cm x 240 roots / 10 cm.

[0024] (3) Post-finishing: The woven grey cloth was added with water in a ratio of 1:15 in a finishing device, and then added with cellulase and protease in a ratio of 1.5% and 1.0% of the weight of the grey cloth respectively for bio-enzyme treatment, with the water temperature kept at 50°C, the treatment time of 50 min, the pH value of the water controlled at 5.5, the water temperature increased to 80°C after the treatment to inactivate the enzymes for 10 min. Then low-temperature cleaning was performed, with the water temperature decreased to 40°C, 2% of alkyl glycoside environmentally friendly detergent of the weight of the grey cloth added, and cleaning for 15 min to remove impurities. Finally, low-temperature setting was performed, with the grey cloth passing through a setting machine at a temperature of 120°C at a speed of 25 meters per minute, to obtain a fabric with stable size and shape.

[0025] Example 2 The present embodiment provides a production method of a blended fabric based on bio-based renewable fibers, with a fiber ratio of 50% of bio-based PLA fiber, 30% of Lyocell fiber, and 20% of recycled wool fiber. The production process specifically includes the following steps: (1) Fiber mixing and spinning: according to the above ratio, PLA fibers with a fineness of 1.8D and a length of 90mm, Lyocell fibers with a fineness of 1.5D and a length of 45mm, and recycled wool fibers with an average fineness of 5.0D and an average length of 55mm were mixed according to the ratio, and then subjected to the processes of opening and cleaning, carding (carding machine cylinder speed 320 rpm), drawing (three passes), roving (twist factor 55), and spinning (spindle speed 12000 rpm, twist factor 360) to spin a blended yarn of 32 English.

[0026] (2) Weaving: The above yarns were respectively used as warp and weft yarns to weave the grey cloth on a rapier loom in 2 / 2 twill weave, with a warp density x weft density of 280 roots / 10 cm x 240 roots / 10 cm.

[0027] (3) Post-finishing: The woven grey cloth was added with water in a ratio of 1:15 in a finishing device, and then added with cellulase and protease in a ratio of 1.5% and 1.0% of the weight of the grey cloth respectively for bio-enzyme treatment, with the water temperature kept at 50°C, the treatment time of 50 min, the pH value of the water controlled at 5.5, the water temperature increased to 80°C after the treatment to inactivate the enzymes for 10 min. Then low-temperature cleaning was performed, with the water temperature decreased to 40°C, 2% of alkyl glycoside environmentally friendly detergent of the weight of the grey cloth added, and cleaning for 15 min to remove impurities. Finally, low-temperature setting was performed, with the grey cloth passing through a setting machine at a temperature of 120°C at a speed of 25 meters per minute, to obtain a fabric with stable size and shape.

[0028] Example 3 This example provides a production method of a blended fabric based on bio-based renewable fibers, with a fiber ratio of 30% bio-based PLA fiber, 40% Lyocell fiber, and 30% recycled wool fiber. The production process specifically includes the following steps: (1) Fiber mixing and spinning: according to the above proportions, PLA fibers with a fineness of 1.2D and a length of 70mm, Lyocell fibers with a fineness of 1.0D and a length of 38mm, and recycled wool fibers with an average fineness of 3.0D and an average length of 35mm are mixed according to the proportion, then after opening and scutching, carding (carding machine cylinder speed 290rpm), drawing (three passes), roving (twist factor 62), and spinning (spindle speed 10500rpm, twist factor 400) processes, 45 English blended yarns are spun.

[0029] (2) Weaving: the above yarns are used as warp and weft yarns respectively, and are woven into gray cloth on a rapier loom with 3 / 1 twill weave, with a warp density x weft density of 300 roots / 10cm x 260 roots / 10cm.

[0030] (3) Finishing: the woven gray cloth is added with water in a ratio of 1:15 in the finishing equipment, then cellulase and protease are added for bio-enzyme treatment, with the cellulase being 1.8% of the weight of the gray cloth and the protease being 1.2% of the weight of the gray cloth, the water temperature is maintained at 45°C, the treatment time is 60 minutes, the pH value of the water is controlled at 5.0, after the treatment is completed, the water temperature is increased to 80°C and maintained for 10 minutes to inactivate the enzyme. Then low-temperature cleaning is carried out, the water temperature is reduced to 40°C, 2% alkyl polyglycoside environmentally friendly detergent is added based on the weight of the gray cloth, and cleaning is carried out for 15 minutes to remove impurities. Finally, low-temperature setting is carried out, and the gray cloth passes through the setting machine at a speed of 22 meters per minute and a temperature of 110°C, thereby obtaining a fabric with stable size and shape.

[0031] Comparative Example 1 Traditional polyester / wool blending is used: polyester 50%, virgin wool 50%. Traditional process is used for finishing: alkaline scouring (60°C, pH 9-10), high-temperature setting (180°C).

[0032] Comparative Example 2 The same fiber ratio as Example 1 is used, and traditional high-temperature process is used for finishing (alkaline scouring 60°C, high-temperature setting 180°C).

[0033] The fabrics produced in Examples 1-3 and Comparative Examples 1-2 are tested for performance. The results are shown in Table 1 below.

[0034] Table 1 Performance Test Results

[0035] Note: Pilling grade is 1-5, the higher the grade, the better the pilling resistance.

[0036] From the data in Table 1, the longitudinal breaking strength and tear strength of the fabric produced by the three embodiments of the application all reach a high level (breaking strength > 520N, tear strength > 25N), although slightly lower than that of the traditional polyester / wool blended fabric of Comparative Example 1, but fully meet the requirements of fabric strength for daily wear. This shows that the application effectively makes up for the partial deficiency of recycled wool fiber and polylactic acid fiber in strength through the reinforcing effect of Lyocell fiber. The produced fabric has good mechanical properties. The fabric produced in the examples (4.0-4.5 grade) is significantly better than Comparative Example 1 (3.5 grade) and Comparative Example 2 (3.0 grade). This fully proves the effectiveness of the biological enzyme treatment, the cellulase smoothens the surface of the Lyocell fiber, and the protease softens the wool scale, which together greatly improves the pilling phenomenon and improves the anti-pilling property. The bending stiffness value (4.0-5.2 cN·cm 2 ) of the fabric produced in the examples is lower than that of the two comparative examples, indicating that it has a softer hand feel and good drape. This is due to the softening effect of the biological enzyme treatment and the selection of suitable fiber ratio in the production process. While Comparative Example 2 causes fiber damage due to high temperature treatment, the hand feel plate is hard, which confirms the necessity of the low-temperature process of the application. The shrinkage of the fabric produced in the examples is controlled within-2%, showing excellent dimensional stability, which is due to the effective fixation of the fabric structure by the low-temperature stretching and setting process. While the high-temperature setting of Comparative Example 2 leads to thermal shrinkage of polylactic acid fiber and damage to wool fiber, the shrinkage is as high as-5.0%, indicating that the traditional high-temperature process is completely unsuitable for the bio-based blended system of the application. At the same time, the air permeability (300-350 mm / s) of the fabric of the examples is better than that of Comparative Example 1, which reflects the good vapor permeability of natural and regenerated fibers, and better wearing comfort.

[0037] Comparative Example 2 and Example 1 use the same raw materials, but due to the use of traditional high-temperature process, the performance, especially the strength and shrinkage, is severely deteriorated. This shows that the low-temperature, bio-based finishing process designed in the application is not a simple process replacement, but a key core technology successfully matched with this specific bio-based / recycled fiber system. In summary, the application produces an environmentally friendly wool blended product with excellent mechanical properties, and high appearance retention and comfort.

[0038] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can still be modified or replaced equivalently, and these modifications or equivalent replacements should not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for producing a blended fabric based on bio-based renewable fibers, characterized by, Specifically comprising the following steps: (1) Fiber mixing and spinning: mixing bio-based polylactic acid fiber, Lyocell fiber and recycled wool fiber, and making yarn through the processes of opening and cleaning, carding, drawing, roving and spinning; (2) Weaving: interweaving the yarn made in step (1) as warp and weft to make a blended gray cloth; (3) Post-finishing: sequentially performing bio-enzyme treatment, low-temperature scouring and low-temperature tentering and setting on the blended gray cloth made in step (2) to obtain the target blended fabric.

2. A method of producing a blended fabric based on biobased renewable fibers according to claim 1, characterized in that: In step (1), the bio-based polylactic acid fiber, Lyocell fiber and recycled wool fiber are included in a weight percentage of 30%-50%, 30%-40% and 20%-30%, respectively.

3. A method of producing a blended fabric based on biobased renewable fibers according to claim 1, characterized in that: In step (1), the bio-based polylactic acid fiber has a fineness of 1.2-1.8D and a length of 70-90mm.

4. A method of producing a blended fabric based on biobased renewable fibers according to claim 1, characterized in that: In step (1), the Lyocell fiber is a regenerated cellulose fiber produced by N-methyl morpholine-N-oxide solvent method, having a fineness of 1.0-1.5D and a length of 38-45mm.

5. A method of producing a blended fabric based on biobased renewable fibers according to claim 1, characterized in that: In step (1), the recycled wool fiber has a fineness of 3.0-5.0D and an average length of 35-55mm.

6. A method of producing a blended fabric based on biobased renewable fibers according to claim 1, characterized in that: In step (3), the bio-enzyme treatment uses a composite enzyme of cellulase and protease, with a treatment temperature of 45-55℃, a treatment time of 40-60 minutes and a pH value of 5.0-6.

0.

7. A method of producing a blended fabric based on bio-based renewable fibers according to claim 1, characterized in that: In step (3), the low-temperature scouring uses a biodegradable surfactant containing alkyl glycoside, with a temperature ≤40℃.

8. A blended fabric based on bio-based renewable fibers according to claim 1, characterized in that: In step (3), the low-temperature tentering and setting has a temperature of 110-125℃.

9. A blended fabric based on bio-based renewable fibers, characterized in that: The blended fabric is made by the production method of any one of claims 1-8.

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