Blended yarn and preparation method thereof

Abstract

The invention relates to a blended yarn and a preparation method thereof, the blended yarn comprises a three-layer composite structure: a surface layer comprises a single-sided single jersey weave woven by 50D-150D supercritical CO2 waterless dyed polyester filament yarn, and the single-sided single jersey weave accounts for 30%-70% of the total mass of the blended yarn; the middle layer comprises lyocell colored spun yarn which is connected through tuck loops, the lyocell colored spun yarn comprises 5wt%-15wt% of black lyocell fibers and 85wt%-95wt% of fibril which are blended, and the surface of the lyocell colored spun yarn is coated with a chitosan / sodium alginate ion cross-linked composite layer; the inner layer comprises looped pile weaves woven by lyocell colored spun yarns, the looped pile weaves are subjected to crosslinking treatment through a CaCl2 solution to form a calcium alginate flame-retardant layer, and the surface resistivity is smaller than or equal to 1 * 10 < 9 > omega.cm. The blended yarn provided by the invention is self-assembled through chitosan / sodium alginate ions, so that flame retardance, antibacterial property and antistatic property are synchronously realized; the water consumption is reduced by supercritical CO2 dyeing, and the fiber strength is protected by low-temperature setting.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, in particular to a blended yarn and a preparation method thereof. Background Art

[0002] As consumers demand ever-increasing quality and functionality in textiles, the market demand for high-performance, multifunctional blended yarns continues to grow. COOLBST, a fiber with superior moisture-wicking properties, Lyocell, renowned for its soft drape and excellent breathability, and fine cotton, widely recognized for its durability and comfort, combine the strengths of these three fibers to develop a COOLBST / cotton / Lyocell blended yarn to meet the urgent market demand for high-quality, multifunctional textiles.

[0003] Traditional pure cotton fabrics suffer from problems such as insufficient moisture absorption and quick-drying, easy pilling, and poor wrinkle resistance. Single functional fibers (such as ordinary polyester) have moisture absorption and quick-drying properties, but poor skin affinity and insufficient breathability. Lyocell fiber fibrillation causes the fabric to pill, which requires special processes or modification to solve. Shortcomings of existing solutions: Existing blending technologies mostly use binary combinations (such as cotton / polyester, cotton / lyocell), but it is difficult to balance multiple properties such as moisture absorption and quick drying, softness and breathability, and durability. The high proportion of Lyocell fiber (such as more than 50%) can easily lead to fabric deformation and insufficient strength.

[0004] It can be seen from this that the above-mentioned existing blended yarns still have inconveniences and defects in the methods, manufacturing methods, processing methods, and use, and are in urgent need of further improvement. In order to solve the problems existing in blended yarns, relevant manufacturers have spared no effort to seek solutions, but for a long time, no suitable design has been developed. Moreover, the general methods, manufacturing methods, processing methods, and blended yarns do not have appropriate methods, manufacturing methods, processing methods, and structures that can solve the above-mentioned problems. This is obviously a problem that the relevant industry must urgently solve.

[0005] In view of the aforementioned shortcomings of existing blended yarns, the inventors, drawing on their extensive practical experience and expertise in the design and manufacture of such products, combined with applied theory, have actively engaged in research and innovation, aiming to create a new blended yarn that would improve upon existing blended yarns and make them more practical. Through continuous research and design, repeated trials and improvements, the present invention has been developed, which possesses truly practical value. Summary of the Invention

[0006] The main purpose of the present invention is to overcome the defects of existing blended yarns and provide a new blended yarn that can solve the problems of low flame retardancy, antibacterial and antistatic properties of blended yarns.

[0007] An embodiment of the present invention provides a blended yarn comprising a three-layer composite structure:

[0008] Surface layer: comprising a single jersey fabric woven from 50D to 150D supercritical CO2 anhydrous dyed polyester filaments, wherein the single jersey fabric accounts for 30% to 70% of the total mass of the blended yarn;

[0009] The middle layer comprises a lyocell colored spun yarn connected by tuck loops, wherein the lyocell colored spun yarn comprises 5wt% to 15wt% of black lyocell fiber blended with 85wt% to 95wt% of original fiber, and the surface is coated with a chitosan / sodium alginate ion cross-linked composite layer;

[0010] Inner layer: It includes terry weave made of lyocell colored yarn, and is cross-linked with CaCl2 solution to form a calcium alginate flame retardant layer with a surface resistivity of ≤1×10 9 Ω·cm.

[0011] In an optional embodiment, in the chitosan / sodium alginate composite layer, the concentration of the chitosan solution is 0.5 wt% to 2.0 wt%, and the concentration of the sodium alginate solution is 0.5 wt% to 2.0 wt%.

[0012] In an optional embodiment, the mass ratio of chitosan to sodium alginate is 1:1.5-2.5.

[0013] In an optional embodiment, the CaCl2 cross-linking treatment step in the inner layer uses a 0.1wt% to 1.0wt% CaCl2 solution, a treatment temperature of 20 to 30°C, and a cross-linking time of 5 to 15 minutes.

[0014] In an optional embodiment, the step parameters of supercritical CO2 dyeing of the surface layer are: disperse dye dosage 1 owf ~ 5% owf, pressure 25 MPa ~ 30 MPa, temperature 120 ~ 135 ° C, time 30 ~ 90 minutes.

[0015] In another aspect, a method for preparing a blended yarn is provided, comprising:

[0016] Lyocell fiber pretreatment step: immersing the lyocell fiber in a chitosan solution with a mass percentage of 0.5wt% to 2.0wt%, spraying, immersing, and cross-linking, wherein the pH of the chitosan solution is 4.5 to 25.5;

[0017] Polyester filament processing steps: dyeing with supercritical CO2;

[0018] Knitting is done using a knitting machine.

[0019] In an optional embodiment, in the lyocell fiber pretreatment step,

[0020] Spray treatment: solidify with 0.1wt% to 1.0wt% NaOH solution and dry at 80℃ to 100℃;

[0021] Dipping treatment: using 0.5wt% to 2.0wt% sodium alginate solution (40-60°C) for dipping, with a rolling rate of 50-70%;

[0022] Cross-linking treatment: Use 0.1wt% to 1.0wt% CaCl2 solution for cross-linking, and wash with water to pH = 6.5 to 7.5.

[0023] In an optional embodiment, a water washing process is included between the chitosan solution treatment and the sodium alginate solution treatment in step 1, with a water washing temperature of 30° C. to 50° C. and a bath ratio of 1:15 to 1:25.

[0024] In an optional embodiment, the method further comprises performing flame retardant and antibacterial synergistic treatment: spraying a composite solution containing 1% to 3wt% phosphorus-nitrogen flame retardant and 0.2wt% to 1.0wt% nano-silver antibacterial agent, with an atomization pressure of 0.3 to 0.8 MPa.

[0025] In an optional embodiment, the 40S lyocell colored yarn is prepared by a siro compact spinning process with a twist of 700 TPM to 850 TPM, a steam twist setting temperature of 100 to 110° C., and a humidity of 80 to 90%.

[0026] Compared with the prior art, the present invention has obvious advantages and beneficial effects. As can be seen from the above technical solutions, in order to achieve the above-mentioned invention objectives, the main technical contents of the present invention are as follows:

[0027] An embodiment of the present invention provides a blended yarn, comprising a three-layer composite structure: a surface layer comprising a single-sided jersey tissue woven with 50D to 150D supercritical CO2 anhydrous dyed polyester filaments, wherein the single-sided jersey tissue accounts for 30% to 70% of the total mass of the blended yarn; a middle layer comprising a lyocell colored spun yarn connected by a tuck loop, wherein the lyocell colored spun yarn comprises a blend of 5wt% to 15wt% black lyocell fiber and 85wt% to 95wt% original fiber, and the surface is coated with a chitosan / sodium alginate ion cross-linked composite layer; an inner layer comprising a terry tissue woven with the lyocell colored spun yarn, which is cross-linked with a CaCl2 solution to form a calcium alginate flame retardant layer, and the surface resistivity is ≤1×109Ω·cm. From the above, it can be seen that the blended yarn provided by the embodiment of the present invention achieves flame retardancy, antibacterial and antistatic properties simultaneously through self-assembly of chitosan / sodium alginate ions; supercritical CO2 dyeing reduces water consumption, and low-temperature setting protects fiber strength; sandwich weaving is combined with color spinning technology to enhance the three-dimensional sense and functional gradient distribution of the fabric.

[0028] By means of the above technical solution, the blended yarn and the preparation method thereof of the present invention have at least the following advantages:

[0029] The blended yarn provided by the embodiment of the present invention achieves flame retardancy, antibacterial and antistatic properties simultaneously through self-assembly of chitosan / sodium alginate ions; supercritical CO2 dyeing reduces water consumption, and low-temperature setting protects fiber strength; sandwich weaving is combined with color spinning technology to enhance the three-dimensional sense and functional gradient distribution of the fabric.

[0030] In summary, the special blended yarn and its preparation method of the present invention, through the self-assembly of chitosan / sodium alginate ions, simultaneously achieve flame retardancy, antibacterial and antistatic properties; supercritical CO2 dyeing reduces water consumption, and low-temperature setting protects fiber strength; sandwich weaving combined with color spinning technology enhances the three-dimensional sense of the fabric and the functional gradient distribution. It has many of the above advantages and practical value, and no similar design has been published or used publicly in similar blended yarns, so it is indeed innovative. It has great improvements in both (method, manufacturing method, processing method) and function, and has made great progress in technology, and has produced easy-to-use and practical effects. It has multiple enhanced functions compared to existing blended yarns, making it more suitable for practical use and has wide industrial utilization value. It is truly a novel, progressive and practical new design.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

[0032] The specific blended yarns of the present invention are given in detail by the following examples and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic flow chart of a method for preparing blended yarn provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail the specific implementation methods, methods, manufacturing methods, processing methods, steps, structures, characteristics and effects of the blended yarn proposed in the present invention.

[0035] An embodiment of the present invention provides a blended yarn comprising a three-layer composite structure:

[0036] Surface layer: comprising a single jersey fabric woven from 50D to 150D supercritical CO2 anhydrous dyed polyester filaments, wherein the single jersey fabric accounts for 30% to 70% of the total mass of the blended yarn.

[0037] The middle layer comprises lyocell colored spun yarn connected by tuck loops, wherein the lyocell colored spun yarn comprises 5wt% to 15wt% of black lyocell fiber blended with 85wt% to 95wt% of original fiber, and the surface is coated with a chitosan / sodium alginate ion cross-linked composite layer.

[0038] Inner layer: It includes terry weave made of lyocell colored yarn, and is cross-linked with CaCl2 solution to form a calcium alginate flame retardant layer with a surface resistivity of ≤1×10 9 Ω·cm.

[0039] The blended yarn provided by the embodiment of the present invention achieves flame retardancy, antibacterial and antistatic properties simultaneously through self-assembly of chitosan / sodium alginate ions; supercritical CO2 dyeing reduces water consumption, and low-temperature setting protects fiber strength; sandwich weaving is combined with color spinning technology to enhance the three-dimensional sense and functional gradient distribution of the fabric.

[0040] The surface layer (polyester filament) of the blended yarn provided by the embodiment of the present invention can provide hydrophobicity and color fastness; the middle layer (chitosan / sodium alginate composite layer) can achieve antibacterial and flame retardant synergy; the inner layer (CaCl2 cross-linked lyocell) can enhance skin-friendliness and flame retardant durability. The blended yarn provided by the embodiment of the present invention has a functional gradient distribution: the surface layer blocks external pollutants, the middle layer blocks the spread of flames, and the inner layer directly contacts the skin to provide antibacterial protection. The chitosan / sodium alginate composite layer inhibits the fibrillation of lyocell, and the pilling grade is improved to level 4-5. The terry structure inner layer improves moisture absorption and air permeability (air permeability ≥350mm / s).

[0041] Exemplarily, the single jersey structure in the surface layer accounts for 30%, 33%, 35%, 37%, 40%, 43%, 47%, 50%, 52%, 53%, 56%, 60%, 62%, 30%, 65% or 70% of the total mass of the blended yarn.

[0042] The lyocell colored yarn can contain 5wt%, 6wt%, 8wt%, 9wt%, 10wt%, 11wt%, 13wt%, 14wt% or 15wt% black lyocell fiber, 85wt%, 86wt%, 87wt%, 89wt%, 90wt%, 91wt%, 92wt%, 93wt%, 94wt% or 95wt% of virgin fiber blend.

[0043] In an optional embodiment, in the chitosan / sodium alginate composite layer, the concentration of the chitosan solution is 0.5 wt% to 2.0 wt%, and the concentration of the sodium alginate solution is 0.5 wt% to 2.0 wt%.

[0044] Illustratively, the chitosan solution concentration can be 0.5wt%, 0.6wt%, 0.8wt%, 0.9wt%, 1.0wt%, 1.1wt%, 1.2wt%, 1.3wt%, 1.7wt%, 1.8wt%, 1.9wt% or 2.0wt%, and the sodium alginate solution concentration is 0.5wt%, 0.6wt%, 0.8wt%, 0.9wt%, 1.0wt%, 1.1wt%, 1.2wt%, 1.3wt%, 1.7wt%, 1.8wt%, 1.9wt% or 2.0wt%.

[0045] This embodiment of the present invention uses chitosan (+ charge) and sodium alginate (- charge) to form a dense nano-coating through ionic bonding, enhancing antibacterial and flame retardant efficacy. By optimizing the concentration and ratio, the solution viscosity is minimized (to a viscosity of ≤200 mPa·s) to ensure uniform spraying.

[0046] In an optional embodiment, the mass ratio of chitosan to sodium alginate is 1:1.5 to 2.5. For example, the mass ratio of chitosan to sodium alginate can be 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2.0, 1:2.1, 1:2.3, 1:2.4 or 1:2.5.

[0047] a 2+ Cross-linked with alginate to form a three-dimensional flame retardant barrier, low-temperature short-time treatment reduces fiber swelling, and the loss of dry breaking strength is ≤10%.

[0048] In an optional embodiment, the CaCl2 cross-linking treatment step in the inner layer uses a 0.1wt% to 1.0wt% CaCl2 solution, a treatment temperature of 20°C to 30°C, and a cross-linking time of 5 to 15 minutes.

[0049] For example, the concentration of the CaCl2 solution can be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt% or 1.0wt%. The supercritical CO2 state has strong permeability and a color fastness of 4-5 (traditional water dyeing 3-4).

[0050] In an optional embodiment, the step parameters of supercritical CO2 dyeing of the surface layer are: disperse dye dosage 1% owf to 5% owf, pressure 25 MPa to 30 MPa, temperature 120 to 135° C., and time 30 minutes to 90 minutes.

[0051] For example, the amount of disperse dye used in supercritical CO2 dyeing of the surface layer is 1% owf, 2% owf, 3% owf, 4% owf, or 5% owf. The pressure can be 25 MPa, 26 MPa, 27 MPa, 28 MPa, 29 MPa, or 30 MPa, etc. The temperature can be 120° C., 125° C., 128° C., 130° C., 131° C., or 135° C., and the reaction time can be 30 minutes, 34 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, or 90 minutes.

[0052] In another aspect, a method for preparing a blended yarn is provided, comprising:

[0053] S1. Lyocell fiber pretreatment step: immersing the lyocell fiber in a chitosan solution with a mass percentage of 0.5wt% to 2.0wt%, and performing spraying, immersion, and cross-linking treatment, wherein the pH of the chitosan solution is 4.5 to 25.5.

[0054] S2. Polyester filament processing steps: dyeing with supercritical CO2.

[0055] S3. Use a knitting machine for knitting.

[0056] In the above method provided by the embodiment of the present invention, each layer is processed independently to avoid performance interference (such as high temperature dyeing of polyester and low temperature cross-linking of lyocell). Chitosan / sodium alginate is cured in steps to shorten the process time.

[0057] In an optional embodiment, during the lyocell fiber pretreatment step,

[0058] Spray treatment: solidify with 0.1wt% to 1.0wt% NaOH solution and dry at 80℃ to 100℃;

[0059] Dipping treatment: using 0.5wt% to 2.0wt% sodium alginate solution (40-60°C) for dipping, with a rolling rate of 50-70%;

[0060] Cross-linking treatment: Use 0.1wt% to 1.0wt% CaCl2 solution for cross-linking, and wash with water to pH = 6.5 to 7.5.

[0061] The present invention uses the above method to remove non-bonded ions: remove residual NaOH to avoid uneven gelation of sodium alginate. After washing, the pH of the fiber is 6.5-7.0 to prevent precipitation during CaCl2 cross-linking.

[0062] In an optional embodiment, a water wash step is included between the chitosan solution treatment and the sodium alginate solution treatment in step 1. The water wash temperature is 30°C to 50°C, and the bath ratio is 1:15 to 1:25. The phosphorus-nitrogen flame retardant and calcium alginate form an expanded carbon layer, further increasing the LOI by 5-8%. Nanosilver is embedded in the chitosan network, and the antibacterial rate remains ≥ 90% after 50 washes.

[0063] In an optional embodiment, the method further comprises performing flame retardant and antibacterial synergistic treatment: spraying a composite solution containing 1% to 3wt% phosphorus-nitrogen flame retardant and 0.2wt% to 1.0wt% nano-silver antibacterial agent, with an atomization pressure of 0.3 to 0.8 MPa.

[0064] Compact spinning reduces hairiness and increases breaking strength by 15%. Structural stability: Steam twist setting eliminates internal stress.

[0065] In an optional embodiment, the 40S lyocell colored yarn is prepared by a siro compact spinning process with a twist of 700 TPM to 850 TPM, a steam twist setting temperature of 100 to 110° C., and a humidity of 80 to 90%.

[0066] Example 1

[0067] Surface layer: 150D supercritical CO2 dyed polyester filament (60%), dyeing parameters: disperse red 3B dye 3% owf, pressure 28 MPa, 130°C×60 min.

[0068] Middle layer: 40S lyocell colored yarn (black lyocell 10%+fibril 90%), chitosan / sodium alginate composite layer (chitosan 1.5wt%, sodium alginate 2.0wt%).

[0069] Inner layer: 20S / 2 lyocell colored yarn, cross-linked with 0.5wt% CaCl2 solution (25℃×10min).

[0070] Preparation steps

[0071] Lyocell pretreatment: chitosan impregnation (1.5 wt%, pH=5, 50°C×30 min)→NaOH spray curing (0.5 wt%, drying at 90°C).

[0072] Sodium alginate immersion (2.0wt%, 50℃×30min)→CaCl2 cross-linking (0.5wt%, 25℃×10min)→water washing (40℃×2 times).

[0073] Polyester dyeing: supercritical CO2 dyeing (parameters same as above)

[0074] Weaving: 24G knitting machine, 1×2 terry structure, surface layer-middle layer-inner layer mass ratio 6:3:1

[0075] Finishing: airflow finishing (90℃×20min, elongation 25%) → shaping (85℃+5g / L silicone softener)

[0076] Test results

[0077] Flame retardancy: LOI = 32% (LOI = 28% after 50 washes). Antibacterial activity: Staphylococcus aureus inhibition rate 97% (93% after 50 washes). Physical properties: Dry breaking strength 4.2 cN / dtex, pilling grade 4-5.

[0078] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make slight changes or modifications to equivalent embodiments of the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A blended yarn, characterized in that: Comprising three-layer composite structure: Surface layer: comprising a single jersey fabric woven from 50D to 150D supercritical CO2 anhydrous dyed polyester filaments, wherein the single jersey fabric accounts for 30% to 70% of the total mass of the blended yarn; The middle layer comprises a lyocell colored spun yarn connected by tuck loops, wherein the lyocell colored spun yarn comprises 5wt% to 15wt% of black lyocell fiber blended with 85wt% to 95wt% of original fiber, and the surface is coated with a chitosan / sodium alginate ion cross-linked composite layer; Inner layer: It includes terry weave made of lyocell colored yarn, and is cross-linked with CaCl2 solution to form a calcium alginate flame retardant layer with a surface resistivity of ≤1×10 9 Ω·cm.

2. The blended yarn according to claim 1, characterized in that In the chitosan / sodium alginate composite layer, the concentration of the chitosan solution is 0.5 wt% to 2.0 wt%, and the concentration of the sodium alginate solution is 0.5 wt% to 2.0 wt%.

3. The blended yarn according to claim 1, characterized in that The mass ratio of the chitosan to the sodium alginate is 1:1.5-2.

5.

4. The blended yarn according to claim 1, characterized in that The CaCl2 cross-linking treatment step in the inner layer adopts 0.1wt% to 1.0wt% CaCl2 solution, the treatment temperature is 20 to 30°C, and the cross-linking time is 5 to 15 minutes.

5. The blended yarn according to claim 1, characterized in that The parameters of the supercritical CO2 dyeing process of the surface layer are: disperse dye dosage 1 owf to 5% owf, pressure 25 MPa to 30 MPa, temperature 120 to 135° C., and time 30 to 90 minutes.

6. A method for preparing a blended yarn, characterized in that: include: Lyocell fiber pretreatment step: immersing the lyocell fiber in a chitosan solution with a mass percentage of 0.5wt% to 2.0wt%, spraying, immersing, and cross-linking, wherein the pH of the chitosan solution is 4.5 to 25.5; Polyester filament processing steps: dyeing with supercritical CO2; Knitting is done using a knitting machine.

7. The method for preparing blended yarn according to claim 6, wherein: In the lyocell fiber pretreatment step, Spray treatment: solidify with 0.1wt% to 1.0wt% NaOH solution and dry at 80℃ to 100℃; Dipping treatment: using 0.5wt% to 2.0wt% sodium alginate solution (40-60°C) for dipping, with a rolling rate of 50-70%; Cross-linking treatment: Use 0.1wt% to 1.0wt% CaCl2 solution for cross-linking, and wash with water to pH = 6.5 to 7.

5.

8. The method for preparing blended yarn according to claim 6, wherein: The chitosan solution treatment and the sodium alginate solution treatment in step 1 include a water washing process, the water washing temperature is 30° C. to 50° C., and the bath ratio is 1:15 to 1:

25.

9. The method for preparing blended yarn according to claim 6, wherein: The method also includes flame retardant and antibacterial synergistic treatment: spraying a composite solution containing 1% to 3wt% phosphorus-nitrogen flame retardant and 0.2wt% to 1.0wt% nano silver antibacterial agent, with an atomization pressure of 0.3 to 0.8 MPa.

10. The method for preparing blended yarn according to claim 6, characterized in that: The 40S lyocell colored yarn is prepared by using a siro compact spinning process with a twist of 700 to 850 TPM, a steam twist setting temperature of 100 to 110° C., and a humidity of 80 to 90%.

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