Juncao single-sided spandex fabric and preparation method thereof

Abstract

The invention discloses a preparation method of a Juncao single-sided spandex fabric, which belongs to the technical field of textiles and comprises the following steps: treating spandex filaments; juncao fiber pretreatment; a covering yarn process: taking spandex as a core yarn and Juncao fiber or modified Juncao fiber as a coating layer, and performing ring spinning and mixing to prevent elasticity damage caused by high temperature; sizing process; weaving high-density single-side cloth: adopting a weft knitting circular knitting machine to perform single-side plain weave; reducing the width; desizing: desizing by adopting low-temperature plasma; the pre-shaping temperature is 170-180 DEG C / 30 seconds, and the width is 8-10% wider than that of a finished product; and carrying out mercerizing, inspection and packaging. The Juncao fiber coating layer in the Juncao single-sided spandex fabric forms a physical barrier through a nanofiber network structure of the Juncao fiber coating layer, so that adhesion and reproduction of bacteria are inhibited; the elasticity of the spandex core yarn is combined, so that the fabric has dynamic comfort and long-acting health protection; and the problem that the existing fungus grass fabric is easy to shrink and fibrillate is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and in particular to a single-sided spandex fabric made of Juncao and a preparation method thereof. Background Art

[0002] Juncao originated in Africa. After being modified by Chinese scientist Professor Lin Zhanhui, giant Juncao was developed. Its high yields can sustain continuous harvests for over 20 years, reaching 500 tons per hectare per year. It is also nutritious, with a plant protein content exceeding 10%. It can be used as a culture medium to replace wood for cultivating various fungi, including shiitake mushrooms and Ganoderma lucidum. It can also be widely used in ecological management, biomass energy production, and new clean energy sources.

[0003] For a long time, my country's cellulose industry has relied on imports for over 80%, posing a potential supply security risk to the industry chain. Research has found that Juncao has a fast production speed, a short production cycle, and a high cellulose content, making it an ideal substitute for wood pulp. Furthermore, the hemicellulose in Juncao can be used as a raw material for bio-based spandex, and the lignin can be used to produce basic chemical raw materials. Juncao fiber can be used in the following areas: Clothing field: antibacterial underwear, antibacterial thermal suits, antibacterial baby full sets of clothing, antibacterial toddler sleeping bags, antibacterial jackets, outdoor products, etc.

[0004] Home textile field: antibacterial bedding, antibacterial curtains, antibacterial sofa products, antibacterial automotive products, etc.

[0005] Medical field: antibacterial masks, medical bed sheets, hospital gowns, medical protective clothing, etc.

[0006] Juncao fabric, made from high-quality Juncao fiber, combines the softness of cotton with the smoothness of silk, boasting excellent dyeing properties and fastness, and boasts a soft, drapey feel. In addition to sharing the characteristics of regenerated cellulose fiber, inspection reports from the National Textile Product Quality Supervision and Inspection Center indicate that Juncao fabric has a 24-hour bactericidal rate exceeding 97% against Staphylococcus aureus, Escherichia coli, and Candida albicans, and an antiviral rate exceeding 99% against HPV16 and influenza A (H1N1). This fabric possesses natural antibacterial and antiviral properties, without the addition of any chemical additives, and is poised to lead the trend in all-natural antibacterial textiles. The production process preserves the natural structure of the Juncao fabric, resulting in zero secondary environmental pollution. The resulting garments are naturally biodegradable, leaving no environmental impact, making it a truly natural, skin-friendly, and antiviral fabric.

[0007] However, there are two problems in using mushroom fiber fabric at present: one is the shrinkage problem of mushroom fiber. Mushroom fiber is a regenerated cellulose fiber (similar to viscose fiber), with a water absorption rate of 13%. After being exposed to water, the diameter of the fiber expands by 40-50%, resulting in significant shrinkage of the fabric. The hydrophilic groups (hydroxyl groups) in the fiber combine with water molecules, causing the fiber to expand horizontally and press the interlacing points of the yarn, forcing the fabric to shrink. In addition, under a humid and hot environment, the molecular chains of mushroom fiber rearrange, and they cannot fully recover to their original state after cooling. Experiments show that the shrinkage rate in 100°C boiling water can reach more than 5%. The second problem is the fibrillation of mushroom fiber. The bonding force between the micro-fibrils inside the fiber is weak, and they can easily split into nanoscale fibrils under stress, resulting in the appearance of white frost or pilling on the surface. The hydrophilic nature of mushroom fiber causes it to absorb moisture and expand in diameter by 40-50% in a humid environment, further weakening the bonding force between the micro-fibrils and increasing the risk of splitting. SUMMARY

[0008] The present application provides a kind of mushroom single-side spandex fabric and its preparation method, solve the existing mushroom fabric easy shrinkage and fibrillation problem.

[0009] To solve the above technical problems, the technical scheme of the present application is as follows: A method for preparing a mushroom single-side spandex fabric, comprising the following steps: (1) Spandex yarn treatment: Take spandex yarn with a fineness of 40D-70D and a pre-drafting multiple of 3.0-4.5, and equilibrate in a constant temperature and humidity environment at a temperature of 25±2°C and a humidity of 65±5% for 24 hours to eliminate internal stress; (2) Mushroom fiber pretreatment: Take mushroom fiber or modified mushroom fiber, and perform pre-humidification treatment to make the moisture content 12%-15%, enhance flexibility, and reduce spinning breakage rate; (3) Core-spun yarn process: Use spandex yarn as core yarn and mushroom fiber or modified mushroom fiber as covering layer, and ring-spinning mix to avoid high-temperature damage to elasticity; (4) Sizing process: Use sizing agent to size the core-spun yarn of step (3); (5) High-density single-side fabric weaving: Use weft-knitting circular knitting machine and single-side plain weave; (6) Shrinkage: Gradually increase the temperature of loose flat washing machine to eliminate weaving stress; (7) Desizing: Use low-temperature plasma desizing; (8) Pre-setting: Pre-setting temperature is 170-180°C / 30 seconds, and the width ratio is 8-10% wider than the finished product; (9) Mercerization: The concentration of mercerizing alkali is ≤180g / L, and low-tension operation is used to maintain the elasticity of spandex;

[0010] In step (2), the modified bacterial grass fiber is prepared by the following method: (1) Alkaline swelling activation: immerse in 15-20% sodium hydroxide solution, temperature 20-30°C, time 2 hours, generate alkali cellulose, squeeze, control moisture content 52±2%; (2) Propylene oxide addition: alkali cellulose and propylene oxide are added at a molar ratio of 1:2-3, the reaction kettle is vacuumed to -0.06 MPa; constant temperature at 56±2°C for 2.5 hours to complete the primary etherification; constant temperature at 87±2°C for 2.5 hours for deep substitution; add glacial acetic acid to adjust pH to 6.5-7.0 to terminate the reaction; wash with 70°C deionized water until the conductivity is ≤50 μS / cm; (3) Post-processing: after centrifugal dewatering, fluidized bed drying at 85°C until the moisture content is ≤5%, and it is obtained.

[0011] In step (3), the mass ratio of spandex yarn to spandex yarn is 1: (8.5-9.5).

[0012] In step (4), the slurry contains, by mass percentage, polyacrylate slurry 60%-65%, oxidized starch 25%-30%, polyvinyl alcohol 4%-5%, acrylic acid 4%-5%, organic fluorine compound 0.5%-1%, and non-ionic surfactant 0.2%-0.3%.

[0013] In step (5), the cylinder diameter of the weft knitting circular machine is 34 inches, and the linear stitch density is 28-32 stitches / inch; high-density flat fabric is woven: fiber density ≥ 42 stitches / cm², and grammage 150-180 g / ㎡.

[0014] In step (6), the speed of step-by-step temperature rise is 60°C→70°C→80°C→90°C, and the temperature interval holding time is 5-6 minutes per step.

[0015] In step (7), the low-temperature plasma desizing process includes the following steps: (1) Take the penetrant mixed solution for padding, and the pick-up rate is 70-80%; the penetrant mixed solution contains penetrant JFC 1.0-1.5 g / L and anionic surfactant 0.5-1.0 g / L; (2) Put the fabric into the low-temperature plasma equipment, the low-temperature plasma equipment uses upper and lower opposed double-sided plasma generator and double-sided dielectric barrier discharge (DBD) reactor, the electrode spacing is 5-10 mm, the cabin door is closed, the vacuum pump is started to extract air to 50-200 Pa, helium-oxygen mixed gas is introduced, the power density is 1.5-3.0 W / cm², and the treatment time is ≤60 seconds; (3) Immediately open the cabin door after the treatment is completed, and take out the fabric; 60-90°C gradient washing, water flow rate ≥ 30 L / kg.

[0016] The application also provides a single-surface spandex fabric of bacterial grass, which is prepared by the preparation method.

[0017] Compared with the prior art, the application has the following beneficial effects: 1. The bacterial grass fiber coating layer in the single-surface spandex fabric of bacterial grass forms a physical barrier through the nanofiber network structure, inhibiting bacterial adhesion and reproduction; combined with the elasticity of the spandex core yarn, the fabric has dynamic comfort and long-term health protection. The natural skin-friendliness and moisture absorption (water absorption rate of 13%) of bacterial grass fiber compensate for the hot and humid defects of spandex, and the outer coating layer provides a cotton touch when directly contacting the skin, avoiding the friction discomfort caused by the exposure of the core yarn. The process realizes the synergistic innovation of "elastic carrier + functional interface" through the physical property complementation of the core layer and the coating layer, providing a new path for the development of functional elastic fabric. In addition, the spandex core layer provides skeleton support, so that the fibrillation rate of bacterial grass fiber is significantly reduced.

[0018] 2. The modified bacterial grass fiber crosslinks the fiber molecular chain through propylene oxide, forms a three-dimensional network structure, improves the tensile strength, reduces the swelling rate, and improves the resilience and inhibits the shrinkage when encountering water through propylene oxide crosslinking.

[0019] 3. The sizing process of the core-spun yarn of spandex / bacterial grass fiber requires that the sizing formula should consider the adhesion of the outer coating fiber and the protection of the core yarn elasticity. The polyacrylate sizing material enhances the surface adhesion of bacterial grass fiber, the oxidized starch reduces the rigidity of the sizing film, protects the elasticity, the polyvinyl alcohol improves the flexibility of the sizing film, and the organic fluorine compound inhibits the moisture absorption and expansion of bacterial grass fiber. The non-ionic surfactant improves the wettability of the sizing liquid.

[0020] 4. The application adopts low-temperature plasma desizing, and the treatment process only requires gas (such as oxygen) and electric energy, without acid and alkali waste liquid discharge, avoiding the pollution of strong alkali to water in the traditional desizing process, and avoiding the damage of high temperature and humidity to bacterial grass fiber, thereby maintaining the strength of bacterial grass fiber. DETAILED DESCRIPTION

[0021] The technical solutions of the application will be described clearly and completely in combination with specific embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application. Embodiment 1

[0022] The embodiment provides a preparation method of a single-surface spandex fabric of bacterial grass, which comprises the following steps: (1) Elastane yarn treatment: Take the elastane yarn with a fineness of 60D and a pre-drafting multiple of 4.0, and equilibrate in a constant temperature and humidity environment at a temperature of 25±2℃ and a humidity of 65±5% for 24 hours to eliminate internal stress; (2) Mushroom grass fiber pretreatment: Take the mushroom grass fiber, and perform pre-wetting treatment to make the moisture content 13%, thereby enhancing flexibility and reducing spinning breakage; (3) Core-spun yarn process: Take the elastane yarn as the core yarn and the mushroom grass fiber or modified mushroom grass fiber as the covering layer, and perform ring spinning mixing to avoid high-temperature damage to elasticity; the mass ratio of the elastane yarn to the elastane yarn is 1:9.0.

[0023] (4) Sizing process: Perform sizing on the core-spun yarn of step (3) using sizing material; the sizing material contains, by mass percentage, polyacrylate sizing material 62%, oxidized starch 28%, polyvinyl alcohol 4.5%, acrylic acid 4.2%, organic fluorine compound 1.0%, and non-ionic surfactant 0.3%; (5) High-density single-sided fabric weaving: Use a weft knitting circular machine to weave single-sided plain weave; the cylinder diameter of the weft knitting circular machine is 34 inches, and the linear stitch density is 30 stitches / inch; weave high-density flat fabric: fiber density ≥ 42 stitches / cm², and gram weight 170 g / m².

[0024] (6) Shrinkage: Perform temperature gradient heating on a loose flat washing machine to eliminate weaving stress; the temperature gradient heating speed is 60℃→70℃→80℃→90℃, and the temperature interval holding time is 5 minutes per interval.

[0025] (7) Desizing: Use low-temperature plasma desizing; (8) Pre-setting: Pre-setting temperature 175℃ / 30 seconds, and door width ratio 9% wider than the finished product; (9) Mercerizing: Mercerizing alkali concentration ≤180 g / L, and low-tension operation to maintain elastane elasticity; (10) Finished product: obtained after inspection and packaging.

[0026] In step (7), the low-temperature plasma desizing process includes the following steps: (1) Dip in a penetrant mixed solution with a pick-up rate of 75%; the penetrant mixed solution contains penetrant JFC 1.2 g / L and anionic surfactant 0.8 g / L; (2) Put the fabric into a low-temperature plasma device, which uses an upper and lower opposed double-sided plasma generator and a double-sided dielectric barrier discharge (DBD) reactor, with an electrode spacing of 8 mm, close the cabin door, start the vacuum pump to extract air to 100 Pa, and then introduce helium-oxygen mixed gas, with a power density of 2.5 W / cm² and a treatment time ≤60 seconds; (3) Immediately open the cabin door after the treatment is completed, and take out the fabric; perform gradient water washing at 75℃, with a water flow rate ≥30 L / kg. Example 2

[0027] This embodiment provides a method for preparing a single-sided spandex fabric made of Juncao, comprising the following steps: (1) Spandex yarn treatment: Spandex yarn with a fineness of 60D and a pre-draft ratio of 4.0 times was taken and balanced in a constant temperature and humidity environment of 25±2℃ and 65±5% for 24 hours to eliminate internal stress; (2) Pretreatment of Juncao fiber: Take the modified Juncao fiber and perform pre-humidification treatment to make the moisture content 13%, enhance flexibility and reduce the spinning breakage rate; (3) Core-spun yarn process: Spandex yarn is used as the core yarn, and the mushroom grass fiber or modified mushroom grass fiber is used as the covering layer, and the mixture is ring-spun to avoid high temperature damage to the elasticity; the mass ratio of the spandex yarn to the spandex yarn is 1:9.0.

[0028] (4) Sizing process: sizing the core-spun yarn in step (3) with a sizing agent; the sizing agent comprises, by weight percentage, 62% polyacrylate sizing agent, 28% oxidized starch, 4.5% polyvinyl alcohol, 4.5% acrylic acid, 0.75% organic fluorine compound, and 0.25% nonionic surfactant; (5) High-density single-sided fabric weaving: using a weft knitting circular machine, single-sided plain weave; the cylinder diameter of the weft knitting circular machine is 34 inches, and the linear stitch density is 30 stitches / inch; weaving high-density flat fabric: fiber density ≥42 stitches / cm², gram weight 170g / ㎡.

[0029] (6) Shrinkage: The loose-type open-width washing machine heats up grid by grid to eliminate weaving stress; the speed of heating up grid by grid is 60℃→70℃→80℃→90℃, and the temperature range is maintained for 5 minutes per grid.

[0030] (7) Desizing: Desizing is done by low-temperature plasma; (8) Pre-forming: Pre-forming temperature is 175℃ / 30 seconds, and the width is 9% wider than the finished product; (9) Mercerization: Mercerization alkali concentration ≤ 180g / L, low tension operation to maintain spandex elasticity; (10) Finished product: obtained after inspection and packaging.

[0031] Wherein, in step (2), the modified Juncao fiber is prepared by the following preparation method: (1) Alkali swelling activation: immerse in 18% sodium hydroxide solution at 25°C for 2 hours to generate alkali cellulose, squeeze, and control the moisture content to 52±2%; (2) Propylene oxide addition: alkali cellulose and propylene oxide are fed at a molar ratio of 1:2.5, the reaction kettle is vacuumed to -0.06 MPa, constant temperature at 56±2℃ for 2.5 hours to complete the primary etherification, constant temperature at 87±2℃ for 2.5 hours for deep substitution, add glacial acetic acid to adjust pH to 6.8 to terminate the reaction, and wash with 70℃ deionized water until the conductivity is ≤50 μS / cm; (3) Post-treatment: after centrifugal dewatering, fluidized bed drying at 85℃ until the moisture content is ≤5%, and the product is obtained.

[0032] In step (7), the low-temperature plasma desizing process comprises the following steps: (1) Take the penetrant mixed solution for padding, and the pick-up rate is 75%; the penetrant mixed solution contains penetrant JFC 1.2 g / L and anionic surfactant 0.8 g / L; (2) Put the fabric into the low-temperature plasma equipment, the low-temperature plasma equipment adopts double-sided plasma generator and double-sided dielectric barrier discharge (DBD) reactor with an electrode spacing of 8 mm, close the cabin door, start the vacuum pump to extract air to 100 Pa, and then introduce helium-oxygen mixed gas, the power density is 2.0 W / cm², and the treatment time is ≤60 seconds; (3) Open the cabin door immediately after the treatment is completed, and take out the fabric; gradient water washing at 75℃, and the water flow rate is ≥30 L / kg. Example 3

[0033] The present embodiment provides a preparation method of bacterial grass single-sided spandex fabric, comprising the following steps: (1) Spandex filament treatment: take spandex filaments with a fineness of 40DD and a pre-drawing multiple of 4.5, and balance in a constant temperature and humidity environment at a temperature of 25±2℃ and a humidity of 65±5% for 24 hours to eliminate internal stress; (2) Bacterial grass fiber pretreatment: take bacterial grass fiber or modified bacterial grass fiber, and carry out pre-humidification treatment to make the moisture content 12%, so as to enhance flexibility and reduce spinning breakage rate; (3) Core-spun yarn process: use spandex filaments as core yarn and bacterial grass fiber or modified bacterial grass fiber as cladding layer, and carry out ring spinning mixing to avoid high-temperature damage to elasticity; the mass ratio of the spandex filaments to the spandex filaments is 1:8.5 (4) Sizing process: use sizing agent to size the core-spun yarn of step (3); the sizing agent contains, by mass percentage, polyacrylate sizing agent 60%, oxidized starch 30%, polyvinyl alcohol 4%, acrylic acid 5%, organic fluorine compound 0.7%, and non-ionic surfactant 0.3%; (5) High-density single-sided fabric weaving: use a weft knitting circular machine to weave single-sided plain weave; the cylinder diameter of the weft knitting circular machine is 34 inches, and the linear stitch density is 28-32 stitches / inch; weave high-density flat fabric: fiber density ≥42 stitches / cm², and grammage 150 g / m².

[0034] (6) Shrinkage: loose flat washing machine, the temperature is increased by 60℃→70℃→80℃→90℃, and the temperature interval is kept for 5 minutes.

[0035] (7) Desizing: low-temperature plasma desizing is adopted. (8) Pre-setting: the pre-setting temperature is 170℃ / 30 seconds, and the width is 10% wider than that of the finished product. (9) Mercerizing: the mercerizing alkali concentration is ≤180g / L, and low-tension operation is adopted to maintain the elasticity of spandex. (10) Finished product: the finished product is obtained after inspection and packaging.

[0036] In step (2), the modified bacterial grass fiber is prepared by the following method: (1) Alkali swelling activation: immersed in 15% sodium hydroxide solution at 30℃ for 2 hours to generate alkali cellulose, and then squeezed to control the water content to 52±2%; (2) Propylene oxide addition: the alkali cellulose and propylene oxide are added in a molar ratio of 1:2, the reaction kettle is vacuumed to -0.06MPa, and then constant temperature is kept at 56±2℃ for 2.5 hours to complete the primary etherification, and then constant temperature is kept at 87±2℃ for 2.5 hours for deep substitution, and then glacial acetic acid is added to adjust the pH to 7.0 to terminate the reaction, and then washed with 70℃ deionized water until the conductivity is ≤50μS / cm; (3) Post-treatment: after centrifugal dewatering, fluidized bed drying is performed at 85℃ until the water content is ≤5%, and then the modified bacterial grass fiber is obtained.

[0037] In step (7), the low-temperature plasma desizing process includes the following steps: (1) The fabric is immersed in a penetrant mixture with a pick-up rate of 70%, and the penetrant mixture contains 1.5g / L of penetrant JFC and 0.5g / L of anionic surfactant; (2) The fabric is placed in a low-temperature plasma device, the low-temperature plasma device adopts an upper and lower opposed double-sided plasma generator and a double-sided dielectric barrier discharge (DBD) reactor, the electrode spacing is 5mm, the cabin door is closed, the vacuum pump is started to extract air to 200Pa, helium-oxygen mixed gas is introduced, the power density is 1.5W / cm², and the treatment time is ≤60 seconds; (3) The cabin door is opened immediately after the treatment is completed, and the fabric is taken out; and then gradient water washing is performed at 60℃, and the water flow is ≥30L / kg. Example 4

[0038] The present embodiment provides a preparation method of bacterial grass single-sided spandex fabric, which includes the following steps: (1) Elastane filament treatment: Take the elastane filament with a fineness of 70D and a pre-drafting multiple of 3.0, and equilibrate in a constant temperature and humidity environment at a temperature of 25±2°C and a humidity of 65±5% for 24 hours to eliminate internal stress; (2) Mushroom grass fiber pretreatment: Take mushroom grass fiber or modified mushroom grass fiber, and perform pre-wetting treatment to make the moisture content 15%, thereby enhancing flexibility and reducing spinning breakage rate; (3) Core-spun yarn process: Take the elastane filament as the core yarn and the mushroom grass fiber or modified mushroom grass fiber as the covering layer, and perform ring spinning mixing to avoid high-temperature damage to elasticity; the mass ratio of the elastane filament to the elastane filament is 1:9.5.

[0039] (4) Sizing process: Perform sizing on the core-spun yarn of step (3) using sizing material; the sizing material contains, by mass percentage, polyacrylate sizing material 65%, oxidized starch 25%, polyvinyl alcohol 5%, acrylic acid 4%, organic fluorine compound 0.8%, and non-ionic surfactant 0.2%; (5) High-density single-sided cloth weaving: Perform weaving using a weft knitting circular machine with single-sided plain weave; the cylinder diameter of the weft knitting circular machine is 34 inches, and the linear stitch density is 28-32 stitches / inch; weave high-density flat cloth with a fiber density of ≥42 stitches / cm² and a grammage of 150-180 g / m².

[0040] (6) Shrinkage: Perform temperature rising in stages on a loose flat washing machine to eliminate weaving stress; the temperature rising speed is 60°C→70°C→80°C→90°C, and the temperature interval holding time is 5-6 minutes per stage.

[0041] (7) Desizing: Perform desizing using low-temperature plasma; (8) Pre-setting: The pre-setting temperature is 170-180°C / 30 seconds, and the door width ratio is 8-10% wider than the finished product; (9) Mercerizing: The mercerizing alkali concentration is ≤180 g / L, and low-tension operation is performed to maintain the elasticity of the elastane; (10) Finished product: The finished product is obtained after inspection and packaging.

[0042] In step (2), the modified mushroom grass fiber is prepared by the following method: (1) Alkali swelling activation: immerse in a 15-20% sodium hydroxide solution at a temperature of 20-30°C for 2 hours to generate alkali cellulose, and then press and control the moisture content to 52±2%; (2) Propylene oxide addition: alkali cellulose and propylene oxide are added in a molar ratio of 1:2-3, the reaction kettle is vacuumed to -0.06 MPa, constant temperature is maintained at 56±2°C for 2.5 hours to complete primary etherification, constant temperature is maintained at 87±2°C for 2.5 hours for deep substitution, ice acetic acid is added to adjust the pH to 6.5-7.0 to terminate the reaction, and then the product is washed with 70°C deionized water until the conductivity is ≤50 μS / cm; (3) Post-processing: after centrifugal dewatering, fluidized bed drying at 85°C until the moisture content is ≤5%, and the product is obtained.

[0043] In step (7), the low-temperature plasma desizing process comprises the following steps: (1) Take the penetrant mixed solution for padding, and the picking-up rate is 70-80%; the penetrant mixed solution contains penetrant JFC 1.0-1.5 g / L and anionic surfactant 0.5-1.0 g / L; (2) Put the fabric into the low-temperature plasma equipment, the low-temperature plasma equipment adopts upper and lower opposed double-sided plasma generator and double-sided dielectric barrier discharge (DBD) reactor, the electrode spacing is 5-10 mm, the cabin door is closed, the vacuum pump is started to extract air to 50-200 Pa, helium-oxygen mixed gas is introduced, the power density is 1.5-3.0 W / cm², and the treatment time is ≤60 seconds; (3) Immediately open the cabin door after the treatment is completed, and take out the fabric; gradient water washing at 60-90°C, and the water flow rate is ≥30 L / kg.

[0044] Comparative Example 1 The present embodiment provides a preparation method of a fungus grass single-side spandex fabric, in the present embodiment, fungus grass fiber roving and spandex pre-draft yarn are fed in parallel at the front roller of the spinning machine, and a double helix structure composite yarn is formed by synchronous twisting, and other process steps and material ratios are the same as those of Example 2.

[0045] Comparative Example 2 The present embodiment provides a preparation method of a fungus grass single-side spandex fabric, in the present embodiment, the sizing material does not contain acrylic acid, and other process steps and material ratios are the same as those of Example 2.

[0046] Comparative Example 3 The present embodiment provides a preparation method of a fungus grass single-side spandex fabric, in the present embodiment, the sizing material does not contain polyvinyl alcohol, and other process steps and material ratios are the same as those of Example 2.

[0047] Comparative Example 4 The present embodiment provides a preparation method of a fungus grass single-side spandex fabric, in the present embodiment, the present embodiment adopts bio-enzyme desizing, and the formula of the bio-enzyme sizing is: amylase 3.5 g / L, penetrant 25 g / L, and sodium chloride 10.0 g / L. Other process steps and material ratios are the same as those of Example 2.

[0048] Performance detection The key indicators of the finished fabric of Examples 1-4 are detected, and the test standards and indicator requirements are shown in Table 1.

[0049] And, the fabric prepared in Examples 1-4 has soft and delicate hand feeling, and the skin feels comfortable and breathable without being hot.

[0050] The key indexes of the finished fabrics of Comparative Examples 1-4 were detected, and the test standards and index requirements are shown in Table 2

[0051] The above merely illustrates the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a single-sided spandex fabric made of Juncao, characterized in that The steps include: (1) Spandex yarn treatment: Spandex yarn with a fineness of 40D-70D and a pre-draft ratio of 3.0-4.5 times is balanced in a constant temperature and humidity environment of 25±2℃ and 65±5% for 24 hours to eliminate internal stress; (2) Juncao fiber pretreatment: Juncao fiber or modified Juncao fiber is pre-humidified to make the moisture content 12%-15% to enhance flexibility and reduce spinning breakage rate; (3) Core-spun yarn process: Spandex yarn is used as the core yarn, and Juncao fiber or modified Juncao fiber is used as the covering layer, and the mixture is ring-spun to avoid high temperature damage to elasticity; (4) Sizing process: sizing the core-spun yarn in step (3) with a sizing agent; (5) High-density single-sided fabric weaving: using weft knitting circular machine, single-sided plain weave; (6) Shrinkage: The loose-type open-width washing machine heats up grid by grid to eliminate weaving stress; (7) Desizing: Desizing is done by low-temperature plasma; (8) Pre-forming: Pre-forming temperature is 170-180℃ / 30 seconds, and the width is 8-10% wider than the finished product; (9) Mercerizing: Mercerizing alkali concentration ≤ 180g / L, low tension operation to maintain spandex elasticity; (10) Finished product: obtained after inspection and packaging.

2. The method for preparing a single-sided spandex fabric made of Juncao according to claim 1, characterized in that: In step (2), the modified Juncao fiber is prepared by the following preparation method: (1) Alkali swelling activation: immerse in 15-20% sodium hydroxide solution at 20-30°C for 2 hours to generate alkali cellulose, squeeze, and control the moisture content to 52±2%; (2) Propylene oxide addition: Alkali cellulose and propylene oxide are added in a molar ratio of 1:2-3, and the reactor is evacuated to -0.06 MPa; the reaction mixture is kept at a constant temperature of 56±2°C for 2.5 hours to complete the primary etherification; the reaction mixture is kept at a constant temperature of 87±2°C for 2.5 hours to achieve deep substitution; glacial acetic acid is added to adjust the pH to 6.5-7.0 to terminate the reaction; and the reaction mixture is washed with deionized water at 70°C until the conductivity is ≤50 μS / cm. (3) Post-processing: After centrifugal dehydration, dry in a fluidized bed at 85°C until the moisture content is ≤5%.

3. The method for preparing a single-sided spandex fabric made of Juncao according to claim 1, characterized in that: In step (3), the mass ratio of the spandex yarn to the spandex yarn is 1:(8.5-9.5).

4. The method for preparing a single-sided spandex fabric made of Juncao according to claim 1, characterized in that: In step (4), the slurry comprises, by mass percentage, 60%-65% of polyacrylate slurry, 25%-30% of oxidized starch, 4%-5% of polyvinyl alcohol, 4%-5% of acrylic acid, 0.5%-1% of organic fluorine compound, and 0.2%-0.3% of nonionic surfactant.

5. The method for preparing a single-sided spandex fabric made of Juncao according to claim 1, characterized in that: In step (5), the cylinder diameter of the weft knitting circular machine is 34 inches, and the linear stitch density is 28-32 needles / inch; the high-density flat cloth is woven with a fiber density of ≥42 needles / cm² and a gram weight of 150-180g / ㎡.

6. The method for preparing a single-sided spandex fabric made of Juncao according to claim 1, characterized in that: In step (6), the speed of heating up the temperature grid by grid is 60°C → 70°C → 80°C → 90°C, and the temperature interval holding time is 5-6 minutes / grid.

7. The method for preparing a single-sided spandex fabric made of Juncao according to claim 1, characterized in that: In step (7), the low-temperature plasma desizing process includes the following steps: (1) taking a penetrant mixed solution for padding, with a padding rate of 70-80%; the penetrant mixed solution contains 1.0-1.5 g / L of penetrant JFC and 0.5-1.0 g / L of anionic surfactant; (2) Place the fabric in a low-temperature plasma device that uses a double-sided plasma generator and a double-sided dielectric barrier discharge reactor with an electrode spacing of 5-10 mm. Close the hatch, start the vacuum pump to extract air to 50-200 Pa, and introduce helium-oxygen mixed gas with a power density of 1.5-3.0 W / cm². The treatment time is ≤60 seconds. (3) After the treatment is completed, open the hatch immediately and take out the fabric; wash with gradient water at 60-90℃, with a water flow rate of ≥30L / kg.

8. A single-sided spandex fabric made of Juncao, characterized in that Prepared by the preparation method according to any one of claims 1 to 7.

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