Natural regenerated composite functional fabric and preparation method thereof

Abstract

This invention provides a natural recycled composite functional fabric, characterized in that: the composite functional fabric is composed of viscose fiber, hemp fiber, and bamboo fiber, woven using a double-weft structure, wherein the warp yarns are a blend of viscose / hemp fiber / bamboo fiber, and both the outer and inner wefts are viscose fiber; the composite functional fabric is modified by lignin / keratin composite. This natural recycled composite functional fabric, composed of viscose fiber, hemp fiber, and bamboo fiber, and woven using a double-weft structure, wherein the warp yarns are a blend of viscose / hemp fiber / bamboo fiber, and both the outer and inner wefts are viscose fiber, can be used as an anti-UV curtain fabric after finishing.

Description

Technical Field

[0001] This invention relates to the field of recycled functional fabrics, specifically to a natural recycled composite functional fabric and its preparation method. Background Technology

[0002] Cotton, linen, and other cellulose fibers are among the most widely used fibers in textile processing worldwide. The main component of these fibers is polysaccharide cellulose, which is easily degraded in the natural environment. While discarding textiles after their lifespan has a relatively small environmental impact, it still results in significant waste. Currently, due to the dwindling global oil resources, biodegradable textile fibers made from renewable resources will become an important development direction for future environmentally friendly textiles. In recent years, my country has generated over 20 million tons of waste textiles annually. In 2016, my country's comprehensive utilization of waste textiles was approximately 3.6 million tons, with a utilization rate of about 18%. As one of the raw materials for environmentally friendly recycled fibers, there is still considerable room for improvement in comprehensive utilization.

[0003] Environmentally friendly recycled fibers were first used in Europe, and later, with the updating of production processes, the concept of environmentally friendly recycled fibers spread worldwide. Subsequently, hundreds of companies further developed and applied them. In 1999, Shanghai, my country, pioneered the development of environmentally friendly recycled fibers, which was recognized as a national demonstration project and achieved considerable success. By 2000, the scale of development of environmentally friendly recycled fibers began to gradually expand. Currently, the production process of environmentally friendly recycled fibers has been recognized by many countries, and its unique production process and fiber characteristics are considered to have good development prospects and can be widely applied in various industries. Environmentally friendly recycled fibers have now become one of the major chemical fibers, with enormous development potential in the coming decades.

[0004] Regenerated cellulose fibers, including those from cotton, linen, and other cellulose fibers, are obtained through recycling and processing. These fibers include viscose fiber, cupro fiber, and bamboo pulp fiber. While they possess excellent performance characteristics, they also suffer from poor fabric dimensional stability, poor wrinkle resistance, and a lack of significant functional features that enhance fabric performance. These issues limit the application and promotion of these fibers in mid-to-high-end textiles, hindering the development of the regenerated fiber industry and its enterprises. Further in-depth research and development are needed to improve the performance of regenerated fiber fabrics, expand application areas, enrich the variety of regenerated cellulose fibers, and enhance product development quality. Summary of the Invention

[0005] The technical problem to be solved: The purpose of this invention is to provide a natural recycled composite functional fabric and its preparation method. It is made of viscose fiber, hemp fiber and bamboo fiber composite and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. It is used as a curtain fabric, etc. However, when viscose fiber is used as warp yarn and interwoven with bamboo fiber and hemp fiber, its UV resistance is much lower than that of bamboo and hemp fibers. At the same time, as a curtain fabric, it is exposed to natural light for a long time. After long-term sun exposure, its color fading is more serious. Therefore, it is necessary to perform UV-resistant finishing on this type of fabric.

[0006] Technical solution: A natural recycled composite functional fabric, wherein the composite functional fabric is composed of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure, wherein the warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber, and the composite functional fabric is modified by lignin / keratin composite.

[0007] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0008] S1. Mix nitric acid and phosphoric acid at a volume ratio of 2-3:1 to obtain a mixed solution, add it to the composite functional fabric, add sodium nitrite to oxidize the fabric, and finally immerse it in a glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0009] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a certain temperature, stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.2-1.2 wt%.

[0010] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain the wool keratin finishing solution;

[0011] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution and stirred continuously at a certain temperature. After two dips and two nips, it is dried in a vacuum oven. After the wool keratin finishing solution forms a film on the fabric, it is treated in methanol solution, then thoroughly washed with water and dried to obtain natural recycled composite functional fabric.

[0012] Preferably, the method for preparing the lignin-modified magnetic particles includes the following steps:

[0013] S11. Prepare a 10-15 wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4-5:1. Continue boiling for 1-3 minutes, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0014] S12. Add pollen to an ethanol solution to wash and remove impurities, and obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 0.5-2wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 0.5-2wt%. After the addition is complete, let it stand and separate into layers, collect the precipitate, and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0015] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.08-0.2wt%; S14. Add magnetic bead powder to water, disperse evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 1-3wt%, add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, filter to obtain lignin-modified magnetic particles.

[0016] Preferably, in step S1, the oxidation treatment time is 25-50 min, and the bath ratio of the composite functional fabric to the mixed solution is 1:20-30. Preferably, in step S2, the mass ratio of sodium sulfide, urea, and sodium dodecyl sulfate is 9:10:470, the temperature is 40-50℃, and the mass ratio of wool to the mixed solution is 1.5-3:100.

[0017] Preferably, in step S3, the concentration of lignin-modified magnetic particles in the wool keratin solution is 1.5-2.4 wt%. Preferably, in step S4, the bath ratio of the carboxylated composite functional fabric in the wool keratin finishing solution is 1:30-50, the stirring reaction temperature is 50-70℃, and the time is 2-3 hours.

[0018] Preferably, in step S4, the vacuum drying temperature is 60-70℃, the time is 2.5-4h, and the methanol solution treatment time is 2-5min.

[0019] Beneficial effects: The preparation method of the present invention has the following advantages:

[0020] 1. This invention uses a composite of viscose fiber, hemp fiber, and bamboo fiber, which results in a relatively rough hand feel. As a curtain fabric, it is exposed to sunlight for a long time and requires good UV resistance to achieve high color fastness. In this invention, the warp yarn is a blend of viscose / hemp fiber / bamboo fiber, while the outer and inner weft yarns are both viscose fiber. Hemp fiber and bamboo fiber already have high UV resistance, while viscose fiber has poor UV resistance. This invention uses a composite modification method to improve the fabric's UV resistance.

[0021] 2. In this invention, lignin-modified magnetic particles were first prepared. Lignin itself has good anti-ultraviolet effect and contains a large number of carboxyl, aryl, phenolic hydroxyl and ketone groups. These groups endow lignin with certain antioxidant and anti-ultraviolet radiation properties. Magnetic particles can have good refraction, reflection and scattering properties for incident ultraviolet light waves. The magnetic particles are prepared into a porous structure, which is beneficial to the adhesion of lignin on the one hand, and increases the refraction, reflection and scattering properties of magnetic particles on the other hand, further improving the anti-ultraviolet effect.

[0022] 3. This invention uses wool keratin to attach lignin-modified magnetic particles to the surface of a fabric. First, the fabric undergoes carboxylation modification, mainly modifying the surface of the viscose fibers in the fabric, which improves the UV resistance of the viscose fibers. Second, wool keratin also has a certain UV resistance effect. Finally, the fabric prepared by this invention is used for curtain fabrics. The hand feel is relatively rough. Treating it with wool keratin can improve the hand feel of the fabric. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments. These embodiments are illustrative of the present invention, but the present invention is not limited to these embodiments:

[0024] Example 1

[0025] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0026] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0027] S1. Mix nitric acid and phosphoric acid at a volume ratio of 2:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:20, add sodium nitrite and then oxidize the fabric for 25 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0028] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 40°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 3:100. Stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.2wt%.

[0029] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 2.4wt%;

[0030] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a bath ratio of 1:30 and stirred continuously at 70°C for 3 hours. After two dips and two nips, it is dried in a vacuum oven at 60°C for 4 hours. After the wool keratin finishing solution forms a film on the fabric, it is placed in a methanol solution for 2 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0031] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0032] S11. Prepare a 10wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 5:1. Continue boiling for 1 minute, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0033] S12. Add pollen to an ethanol solution to wash away impurities and obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 2wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 1:1. After the addition is complete, let it stand and separate into layers. Collect the precipitate and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0034] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.08 wt%;

[0035] S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 3wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, and filter to obtain lignin-modified magnetic particles.

[0036] Example 2

[0037] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0038] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0039] S1. Mix nitric acid and phosphoric acid at a volume ratio of 3:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:30, add sodium nitrite and then oxidize the fabric for 50 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0040] S2. The degreased wool is added to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 50°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 1.5:100. The mixture is stirred until the wool is completely dissolved, and then dialyzed to obtain a wool keratin solution with a concentration of 1.2 wt%.

[0041] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 1.5wt%.

[0042] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a bath ratio of 1:50 and stirred continuously at 50°C for 2 hours. After two dips and two nips, it is dried in a vacuum oven at 70°C for 2.5 hours. After the wool keratin finishing solution forms a film on the fabric, it is treated in methanol solution for 5 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0043] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0044] S11. Prepare a 15wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4:1. Continue boiling for 1 minute, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0045] S12. Add pollen to an ethanol solution to wash and remove impurities, and obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 0.5 wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 0.5 wt%. After the addition is complete, let it stand and separate into layers, collect the precipitate, and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0046] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.2wt%;

[0047] S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 1wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, and filter to obtain lignin-modified magnetic particles.

[0048] Example 3

[0049] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0050] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0051] S1. Mix nitric acid and phosphoric acid at a volume ratio of 2:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:25, add sodium nitrite and then oxidize the fabric for 40 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0052] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 40°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 1.5:100. Stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 1 wt%.

[0053] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 1.8wt%.

[0054] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a liquor ratio of 1:35 and stirred continuously at 65°C for 3 hours. After two dips and two nips, it is dried in a vacuum oven at 60°C for 3.5 hours. After the wool keratin finishing solution forms a film on the fabric, it is treated in methanol solution for 3.5 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0055] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0056] S11. Prepare a 14wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 5:1. Continue boiling for 1 minute, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0057] S12. Add pollen to an ethanol solution to wash and remove impurities, and obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 0.8 wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 0. After the addition is complete, let it stand and separate into layers, collect the precipitate, and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0058] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.12wt%;

[0059] S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 2.4wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, and filter to obtain lignin-modified magnetic particles.

[0060] Example 4

[0061] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0062] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0063] S1. Mix nitric acid and phosphoric acid at a volume ratio of 3:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:30, add sodium nitrite and then oxidize the fabric for 35 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0064] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 50°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 3:100. Stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.4wt%.

[0065] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 2.2wt%;

[0066] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a bath ratio of 1:45 and stirred continuously at 55°C for 2 hours. After two dips and two nips, it is dried in a vacuum oven at 70°C for 3 hours. After the wool keratin finishing solution forms a film on the fabric, it is placed in a methanol solution for 4 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0067] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0068] S11. Prepare a 12wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4:1. Continue boiling for 3 minutes, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0069] S12. Add pollen to an ethanol solution to wash and remove impurities to obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 1.5 wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 1:1. After the addition is complete, let it stand and separate into layers. Collect the precipitate and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0070] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.16wt%;

[0071] S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 1.5wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, and filter to obtain lignin-modified magnetic particles.

[0072] Example 5

[0073] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0074] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0075] S1. Mix nitric acid and phosphoric acid at a volume ratio of 2.5:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:26, add sodium nitrite and then oxidize the fabric for 6 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0076] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 40°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 2:100. Stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.6wt%.

[0077] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 2wt%;

[0078] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a liquor ratio of 1:40 and stirred continuously at 60°C for 2.5 hours. After two dips and two nips, it is dried in a vacuum oven at 65°C for 3 hours. After the wool keratin finishing solution forms a film on the fabric, it is treated in methanol solution for 3.5 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0079] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0080] S11. Prepare a 13wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4.5:1. Continue boiling for 2 minutes, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0081] S12. Add pollen to an ethanol solution to wash and remove impurities to obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 1.1 wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 1:1. After the addition is complete, let it stand and separate into layers. Collect the precipitate and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0082] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.14wt%;

[0083] S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 2wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, filter, and obtain lignin-modified magnetic particles.

[0084] Comparative Example 1

[0085] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0086] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0087] S1. Mix nitric acid and phosphoric acid at a volume ratio of 3:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:30, add sodium nitrite and then oxidize the fabric for 35 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0088] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 50°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 3:100. Stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.4wt%.

[0089] S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 2.2wt%;

[0090] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a liquor ratio of 1:45 and stirred continuously at 55°C for 2 hours. After two dips and two nips, it is dried in a vacuum oven at 70°C for 3 hours. After the wool keratin finishing solution forms a film on the fabric, it is placed in a methanol solution for 3 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0091] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0092] S11. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.16wt%;

[0093] S14. Add nano solid magnetic bead powder to water, disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 1.5wt%. Add lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, filter, and obtain lignin-modified magnetic particles.

[0094] Comparative Example 2

[0095] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by magnetic beads / keratin composite.

[0096] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0097] S1. Mix nitric acid and phosphoric acid at a volume ratio of 2.5:1 to obtain a mixed solution, add the composite functional fabric, the bath ratio of the composite functional fabric to the mixed solution is 1:26, add sodium nitrite and then oxidize the fabric for 6 minutes, finally immerse it in glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric.

[0098] S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a temperature of 45°C. The mass ratio of sodium sulfide, urea and sodium dodecyl sulfate is 9:10:470, and the mass ratio of wool to the mixed solution is 2:100. Stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.6wt%.

[0099] S3. Add the hollow porous magnetic particles to the wool keratin solution, mix and stir evenly to obtain a wool keratin finishing solution with a concentration of 2wt%;

[0100] S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution at a liquor ratio of 1:40 and stirred continuously at 60°C for 2.5 hours. After two dips and two nips, it is dried in a vacuum oven at 65°C for 3 hours. After the wool keratin finishing solution forms a film on the fabric, it is treated in methanol solution for 3.5 minutes. Then it is thoroughly washed with water and dried to obtain the natural recycled composite functional fabric.

[0101] The method for preparing the hollow porous magnetic particles includes the following steps:

[0102] S11. Prepare a 13wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4.5:1. Continue boiling for 2 minutes, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0103] S12. Add pollen to an ethanol solution to wash away impurities and obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 1.1 wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is [missing information]. After the addition is complete, let it stand and separate into layers. Collect the precipitate and calcine it under a nitrogen atmosphere to obtain magnetic bead powder.

[0104] Comparative Example 3

[0105] A natural recycled composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite.

[0106] The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps:

[0107] Carboxylated composite functional fabric was immersed in a lignin-modified magnetic particle finishing solution with a mass fraction of 2wt% at a bath ratio of 1:40. The mixture was stirred continuously at 60℃ for 2.5 hours. After two dips and two nips, the fabric was dried in a vacuum oven to obtain natural recycled composite functional fabric.

[0108] The preparation method of the lignin-modified magnetic particles includes the following steps:

[0109] S11. Prepare a 13wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4.5:1. Continue boiling for 2 minutes, and finally cool to room temperature to obtain Fe(OH)3 colloid.

[0110] S12. Add pollen to an ethanol solution to wash and remove impurities to obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 1.1 wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 1:1. After the addition is complete, let it stand and separate into layers. Collect the precipitate and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder.

[0111] S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.14wt%;

[0112] S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 2wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, filter, and obtain lignin-modified magnetic particles.

[0113] The specifications of the fabric warp yarns in the above embodiments and comparative examples are as follows: the blending ratio of viscose / hemp fiber / bamboo fiber is 60 / 20 / 20, 19.8 tex, the specifications of the inner weft and outer weft are 40s, the warp density is 630 ends / 10cm, and the weft density is 374 ends / 10cm.

[0114] UPF value Example 1 102 Example 2 108 Example 3 105 Example 4 112 Example 5 109 Comparative Example 1 78 Comparative Example 2 80 Comparative Example 3 56

[0115] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A natural recycled composite functional fabric, characterized in that: The composite functional fabric is made of viscose fiber, hemp fiber and bamboo fiber, and is woven with a double weft structure. The warp yarn is a blend of viscose / hemp fiber / bamboo fiber, and the outer weft and inner weft are both viscose fiber. The composite functional fabric is modified by lignin / keratin composite. The preparation method of the above-mentioned natural recycled composite functional fabric includes the following steps: S1. Mix nitric acid and phosphoric acid at a volume ratio of 2-3:1 to obtain a mixed solution, add it to the composite functional fabric, add sodium nitrite to oxidize the fabric, and finally immerse it in a glycerol solution for soaking treatment, wash and dry to obtain carboxylated composite functional fabric. S2. Add the degreased wool to a mixed solution of sodium sulfide, urea and sodium dodecyl sulfate at a certain temperature, stir until the wool is completely dissolved, and then dialyze to obtain a wool keratin solution with a concentration of 0.2-1.2 wt%. S3. Add the lignin-modified magnetic particles to the wool keratin solution, mix and stir evenly to obtain the wool keratin finishing solution; S4. The carboxylated composite functional fabric is immersed in wool keratin finishing solution and stirred continuously at a certain temperature. After two dips and two nips, it is dried in a vacuum oven. After the wool keratin finishing solution forms a film on the fabric, it is placed in methanol solution for treatment, and then thoroughly washed and dried with water to obtain natural recycled composite functional fabric. The preparation method of the lignin-modified magnetic particles includes the following steps: S11. Prepare a 10-15 wt% ferric chloride solution, then add boiling water dropwise while stirring. The volume ratio of boiling water to ferric chloride solution is 4-5:

1. Continue boiling for 1-3 minutes, and finally cool to room temperature to obtain Fe(OH)3 colloid. S12. Add pollen to an ethanol solution to wash away impurities and obtain pretreated pollen. Add the pretreated pollen to water and ultrasonically disperse it evenly to obtain a pollen dispersion with a concentration of 0.5-2wt%. Then, add the Fe(OH)3 colloid prepared in step S11 dropwise. The volume ratio of Fe(OH)3 colloid to pollen dispersion is 0.5-2wt%. After the addition is complete, let it stand and separate into layers. Collect the precipitate and calcine the precipitate under a nitrogen atmosphere to obtain magnetic bead powder. S13. Dissolve lignin in tetrahydrofuran solution, stir and mix evenly to obtain a lignin solution with a concentration of 0.08-0.2wt%; S14. Add the magnetic bead powder to water and disperse it evenly by ultrasonication to obtain a magnetic bead dispersion with a concentration of 1-3wt%. Add the lignin solution to the magnetic bead dispersion at a volume ratio of 1:1, stir and mix, and filter to obtain lignin-modified magnetic particles.

2. The natural recycled composite functional fabric according to claim 1, characterized in that: In step S1, the oxidation treatment time is 25-50 minutes, and the bath ratio of the composite functional fabric to the mixed solution is 1:20-30.

3. The natural recycled composite functional fabric according to claim 1, characterized in that: In step S2, the mass ratio of sodium sulfide, urea, and sodium dodecyl sulfate is 9:10:470, the temperature is 40-50℃, and the mass ratio of wool to the mixed solution is 1.5-3:

100.

4. The natural recycled composite functional fabric according to claim 1, characterized in that: In step S3, the concentration of lignin-modified magnetic particles in the wool keratin solution is 1.5-2.4 wt%.

5. The natural recycled composite functional fabric according to claim 1, characterized in that: In step S4, the carboxylated composite functional fabric is in a bath ratio of 1:30-50 in the wool keratin finishing solution, the stirring reaction temperature is 50-70℃, and the time is 2-3 hours.

6. The natural recycled composite functional fabric according to claim 1, characterized in that: In step S4, the vacuum drying temperature is 60-70℃ and the time is 2.5-4h, while the methanol solution treatment time is 2-5min.