High strength air permeable cashmere blended yarn

Abstract

The application relates to the technical field of blended yarns, and particularly discloses a high-strength air-permeable cashmere blended yarn, which is obtained by impregnating treatment of a blended yarn in a finishing liquid, wherein the blended yarn comprises, according to weight fractions, 100 parts of cashmere fibers, 25-35 parts of modified nylon fibers and 12-16 parts of flax fibers; the modified nylon fibers are obtained by melt blending and spinning of epoxy-modified silicon dioxide-oxidized graphene composite particles and nylon chips; the three different fibers are blended, the internal structure of the yarn is more fluffy, capillary channels penetrating through the yarn are formed, the circulation of air and moisture is facilitated, the finished yarn has hydrophilicity, water can be quickly diffused and evaporated in combination with the fluffy structure of the blended yarn, the stuffy feeling during wearing is avoided, the blended yarn not only retains the comfort of cashmere but also has durability and anti-pilling property which are much better than those of pure cashmere yarn, and the application range is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of blended yarn technology, specifically a high-strength, breathable cashmere blended yarn. Background Technology

[0002] Cashmere, as a natural protein fiber, is characterized by its softness, delicacy, and strong warmth retention. Due to the unique scaly structure on the surface of cashmere fibers and their internal pores, it possesses excellent moisture absorption properties. However, in actual production and use, pure cashmere fibers have relatively low strength and are prone to shrinkage, pilling, and even felting. Furthermore, the limited pore structure of pure cashmere products in high-density knitted fabrics can restrict breathability, resulting in poor breathability.

[0003] To address the aforementioned issues, cashmere fibers are typically blended with other fibers. However, the addition of chemical fibers can reduce the yarn's moisture absorption and wicking properties, making it difficult to balance breathability with the unique comfort of cashmere. Chinese patent application CN120366943A discloses a process for preparing cashmere blended yarn. Cashmere and polyester fibers are pretreated separately, then blended in a 2:1 weight ratio. The blending process involves opening, cleaning, combing, and finishing to obtain a tops. The tops are then processed through pre-spinning, combing, roving, spinning, winding, doubling, twisting, steaming, and package spinning to obtain the finished cashmere blended yarn. This cashmere blended yarn exhibits good mechanical properties, but the hydrophobicity of polyester results in poor breathability. Chinese patent application CN110117853A discloses a multifunctional cashmere blended yarn and its preparation method. The cashmere blended yarn includes 10-50% cashmere, 40-80% graphene composite fiber, and 10-50% other textile fibers. However, no specific performance tests are given, and the cashmere content is relatively low, resulting in poor comfort.

[0004] Therefore, it is of great significance to develop a blended yarn that retains the excellent properties of cashmere while also having outstanding breathability.

[0005] Summary of the Invention (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a high-strength, breathable cashmere blended yarn, solving the problem of poor breathability in cashmere blended yarns.

[0006] (II) Technical Solution To achieve the above objectives, the present invention discloses a high-strength breathable cashmere blended yarn, which is obtained by impregnating blended yarn in a finishing solution; the blended yarn comprises, by weight, 100 parts cashmere fiber, 25-35 parts modified nylon fiber, and 12-16 parts flax fiber. The method for preparing the modified nylon fiber includes the following steps: S1. After stirring and mixing deionized water and surfactant evenly, add citric acid, n-octadecane and anhydrous ethanol mixture dropwise. Heat and stir at 60℃ and 400r / min for 1h. Add 10wt% sodium silicate solution and graphene oxide dispersion. After mixing evenly, transfer to polytetrafluoroethylene reactor for hydrothermal reaction. After the reaction is completed, cool, filter, wash three times with deionized water and anhydrous ethanol respectively, and vacuum dry at 60℃ for 12h to obtain silica-graphene oxide composite particles. S2. The silica-graphene oxide composite particles were ultrasonically dispersed in an ethanol solution, and the pH was adjusted to 3-4 using acetic acid solution. Then, γ-glycidyl etheroxypropyltrimethoxysilane was added, the mixture was heated and stirred to allow the reaction to occur. After the reaction was completed, the particles were centrifuged at a speed of 8000 r / min for 10 min. The particles were washed with anhydrous ethanol and dried at 50℃ for 6 h to obtain epoxy-modified silica-graphene oxide composite particles. S3. Nylon chips and epoxy-modified silica-graphene oxide composite particles are added to a twin-screw extruder for melt blending and extrusion. The melt is then fed into a spinning machine via a metering pump and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 0.5-1.0 m / s and a temperature of 20-25℃ to obtain modified nylon fibers.

[0007] As a further aspect of the present invention: the mass ratio of deionized water, surfactant, citric acid, n-octadecane, anhydrous ethanol, sodium silicate solution and graphene oxide dispersion in S1 is 80-150:1-3:2-4:9-12:15-25:35-65:100.

[0008] As a further aspect of the present invention: the surfactant in S1 is Tween-80.

[0009] As a further aspect of the present invention: the temperature of the hydrothermal reaction in S1 is 140-160℃, and the time of the hydrothermal reaction is 12-15h.

[0010] As a further aspect of the present invention: the graphene oxide content in the graphene oxide dispersion in S1 is 5 mg / mL.

[0011] As a further embodiment of the present invention: the mass ratio of silicon dioxide-graphene oxide composite particles, ethanol solution, and γ-glycidyl etheroxypropyltrimethoxysilane in S2 is 100:1500-1600:16-21, the reaction temperature is 60-70℃, and the reaction time is 4-6h.

[0012] As a further aspect of the present invention: the ethanol solution in S2 is composed of anhydrous ethanol and deionized water in a volume ratio of 9:1.

[0013] As a further aspect of the present invention: the mass ratio of nylon chips and epoxy-modified silica-graphene oxide composite particles in S3 is 100:2-7, and the melt blending temperature is 235-245℃.

[0014] As a further aspect of the present invention: the modified nylon fiber in S3 has a fineness of 40 dtex.

[0015] As a further aspect of the present invention: before blending, the flax fibers are first subjected to oiling and humidification softening treatment, and then combed using a combing machine.

[0016] As a further aspect of the present invention: the finishing solution is composed of deionized water, 1,2,3,4-butanetetracarboxylic acid, and a dispersant in a mass ratio of 1800-2100:100:0.3-0.5.

[0017] As a further aspect of the present invention: the dispersant is a fatty alcohol polyoxyethylene ether dispersant.

[0018] As a further aspect of the present invention: the dispersant is AEO-9.

[0019] As a further aspect of the present invention: during the impregnation process, the impregnation bath ratio is 1:18-20, the impregnation temperature is 30-35℃, the impregnation time is 30-60min, after the impregnation process is completed, the blended yarn is taken out, centrifuged and dehydrated, baked at 160-180℃ for 2-4min, washed with deionized water 3-5 times, and then dried at 60℃.

[0020] As a further aspect of the present invention: the fineness of the blended yarn is 32-40 English count, which is obtained by ring spinning process, and the spinning process successively goes through opening, carding, drawing, roving and spinning processes.

[0021] (iii) Beneficial technical effects Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In the preparation process of silica-graphene oxide composite particles in this invention, silica-graphene oxide composite particles were prepared using n-octadecane as a template. These composite particles have a three-dimensional porous structure, which creates a large number of micro-airflow channels inside the modified nylon fibers. Epoxy modification was then performed on them, introducing epoxy groups onto the surface of the composite particles, which were uniformly dispersed in the nylon fibers, effectively preventing agglomeration. Graphene oxide provides two-dimensional sheet-like reinforcement of mechanical properties and also has good moisture absorption and wicking properties, which can quickly absorb sweat from the skin surface and transport it to the outer layer. Silica has excellent mechanical strength. The two work synergistically to improve the overall performance of the blended yarn.

[0022] (2) In this invention, the introduction of inorganic particles and nylon fibers improves the shortcomings of traditional cashmere blended yarns, such as easy wear and low strength. The composite particles have high strength and good toughness, which can play a role in reinforcing the skeleton. After epoxy modification, the epoxy groups form chemical bonds with the nylon molecular chains, significantly improving the interfacial bonding force and preventing the particles from falling off under stress. The reinforcing effect is washable and durable.

[0023] (3) The yarn treated in this invention is hydrophilic, and combined with its fluffy structure, it allows moisture to diffuse and evaporate quickly, avoiding a stuffy feeling when wearing it. 1,2,3,4-Butanetetracarboxylic acid is used as a crosslinking agent in the finishing solution to form a thin crosslinked film on the fiber surface, without blocking the natural gaps between fibers, thus avoiding local accumulation that affects breathability. 1,2,3,4-Butanetetracarboxylic acid can undergo a crosslinking reaction with the hydroxyl groups of cashmere and linen and the amide groups of nylon, binding the molecular chains of the three fibers, reducing breakage caused by fiber slippage, and further solidifying the crosslinked structure through a baking process, thereby improving the strength and toughness of the blended yarn. Furthermore, it restricts the free contraction movement of fiber molecules during washing, preventing the yarn from collapsing excessively in a humid and hot environment, avoiding dimensional changes during washing, thus maintaining the fluffy structure and breathable channels of the yarn for a long time, and improving the service life of the blended yarn.

[0024] (4) In this invention, flax fiber itself has a hollow cross-section and longitudinal grooves, making it a natural moisture-absorbing and breathable material. It can effectively conduct moisture and expel air, regulating the moisture absorption of the blended yarn. Combined with the porous characteristics of modified nylon, it has excellent breathability. The addition of modified nylon fiber breaks the overly tight arrangement of cashmere fibers, forming more micropores. The blending of three different fibers makes the internal structure of the yarn more fluffy, forming capillary channels that run through the yarn, which is conducive to the circulation of air and moisture. The blended yarn retains the comfort of cashmere while possessing durability and anti-pilling properties far superior to pure cashmere yarn. It can be widely used in high-end knitwear, casual jackets, scarves, and other textiles, combining functionality and market competitiveness. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Example 1 A modified nylon fiber, the preparation method of which includes the following steps: S1. After mixing deionized water and surfactant Tween-80 evenly, add a mixture of citric acid, n-octadecane, and anhydrous ethanol dropwise. Heat the mixture and stir at 60℃ and 400r / min for 1h. Add 10wt% sodium silicate solution and graphene oxide dispersion. The mass ratio of deionized water, surfactant, citric acid, n-octadecane, anhydrous ethanol, sodium silicate solution, and graphene oxide dispersion is 80:1:2:9:15:35:100. After mixing evenly, transfer the mixture to a polytetrafluoroethylene reactor and carry out a hydrothermal reaction at 140℃ for 15h. After the reaction is completed, cool, filter, wash three times with deionized water and anhydrous ethanol respectively, and vacuum dry at 60℃ for 12h to obtain silica-graphene oxide composite particles. S2. The silica-graphene oxide composite particles were ultrasonically dispersed in an ethanol solution, and the pH was adjusted to 3 using acetic acid solution. Then, γ-glycidoxypropyltrimethoxysilane was added, wherein the mass ratio of silica-graphene oxide composite particles, ethanol solution, and γ-glycidoxypropyltrimethoxysilane was 100:1500:16. The mixture was heated and stirred at 60°C for 6 hours to allow the reaction to proceed. After the reaction was completed, the mixture was centrifuged at a speed of 8000 r / min for 10 minutes. The mixture was washed with anhydrous ethanol and dried at 50°C for 6 hours to obtain epoxy-modified silica-graphene oxide composite particles. S3. Nylon chips and epoxy-modified silica-graphene oxide composite particles with a mass ratio of 100:2 are added to a twin-screw extruder and melt-blended at 235°C. The mixture is then extruded, and the melt is pumped into a spinning machine and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 0.5 m / s and a temperature of 20°C to obtain modified nylon fibers.

[0027] Example 2 A modified nylon fiber, the preparation method of which includes the following steps: S1. After mixing deionized water and surfactant Tween-80 evenly, add a mixture of citric acid, n-octadecane, and anhydrous ethanol dropwise. Heat the mixture and stir at 60℃ and 400r / min for 1h. Add 10wt% sodium silicate solution and graphene oxide dispersion. The mass ratio of deionized water, surfactant, citric acid, n-octadecane, anhydrous ethanol, sodium silicate solution, and graphene oxide dispersion is 120:2:3:11:21:50:100. After mixing evenly, transfer the mixture to a polytetrafluoroethylene reactor and carry out a hydrothermal reaction at 150℃ for 14h. After the reaction is completed, cool, filter, wash three times with deionized water and anhydrous ethanol respectively, and vacuum dry at 60℃ for 12h to obtain silica-graphene oxide composite particles. S2. The silica-graphene oxide composite particles were ultrasonically dispersed in an ethanol solution, and the pH was adjusted to 3.5 using acetic acid solution. Then, γ-glycidoxypropyltrimethoxysilane was added, wherein the mass ratio of silica-graphene oxide composite particles, ethanol solution, and γ-glycidoxypropyltrimethoxysilane was 100:1550:18. The mixture was heated and stirred at 65°C for 5 hours to allow the reaction to proceed. After the reaction was completed, the mixture was centrifuged at 8000 r / min for 10 minutes. The particles were washed with anhydrous ethanol and dried at 50°C for 6 hours to obtain epoxy-modified silica-graphene oxide composite particles. S3. Nylon chips and epoxy-modified silica-graphene oxide composite particles with a mass ratio of 100:5 are added to a twin-screw extruder and melt-blended at 240°C. The mixture is then extruded, and the melt is pumped into a spinning machine and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 0.8 m / s and a temperature of 22°C to obtain modified nylon fibers.

[0028] Example 3 A modified nylon fiber, the preparation method of which includes the following steps: S1. After mixing deionized water and surfactant Tween-80 evenly, add a mixture of citric acid, n-octadecane, and anhydrous ethanol dropwise. Heat the mixture and stir at 60℃ and 400r / min for 1h. Add 10wt% sodium silicate solution and graphene oxide dispersion. The mass ratio of deionized water, surfactant, citric acid, n-octadecane, anhydrous ethanol, sodium silicate solution, and graphene oxide dispersion is 150:3:4:12:25:65:100. After mixing evenly, transfer the mixture to a polytetrafluoroethylene reactor and carry out a hydrothermal reaction at 160℃ for 12h. After the reaction is completed, cool, filter, wash three times with deionized water and anhydrous ethanol respectively, and vacuum dry at 60℃ for 12h to obtain silica-graphene oxide composite particles. S2. The silica-graphene oxide composite particles were ultrasonically dispersed in an ethanol solution, and the pH was adjusted to 4 using acetic acid solution. Then, γ-glycidoxypropyltrimethoxysilane was added, wherein the mass ratio of silica-graphene oxide composite particles, ethanol solution, and γ-glycidoxypropyltrimethoxysilane was 100:1600:21. The mixture was heated and stirred at 70°C for 4 hours to allow the reaction to proceed. After the reaction was completed, the mixture was centrifuged at a speed of 8000 r / min for 10 minutes. The mixture was washed with anhydrous ethanol and dried at 50°C for 6 hours to obtain epoxy-modified silica-graphene oxide composite particles. S3. Nylon chips and epoxy-modified silica-graphene oxide composite particles with a mass ratio of 100:7 are added to a twin-screw extruder and melt-blended at 245°C. The mixture is then extruded, and the melt is pumped into a spinning machine and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 1.0 m / s and a temperature of 25°C to obtain modified nylon fibers.

[0029] Example 4 A high-strength, breathable cashmere blended yarn is prepared as follows: The blended yarn was impregnated in a finishing solution. The blended yarn, by weight, consisted of 100 parts cashmere fiber, 25 parts modified nylon fiber, and 12 parts flax fiber. The yarn had a fineness of 32 English count and was produced by ring spinning. The spinning process involved opening, carding, drawing, roving, and spinning. The finishing solution consisted of deionized water (1800:100:0.3 by mass), 1,2,3,4-butanetetracarboxylic acid, and dispersant AEO-9. The impregnation bath ratio was 1:18, the impregnation temperature was 30℃, and the impregnation time was 60 minutes. After impregnation, the blended yarn was removed, centrifuged to remove water, baked at 160℃ for 4 minutes, washed three times with deionized water, and then dried at 60℃ to obtain a high-strength, breathable cashmere blended yarn.

[0030] The preparation method of the modified nylon fiber in this embodiment is completely consistent with the preparation method of the modified nylon fiber in Example 1.

[0031] Example 5 A high-strength, breathable cashmere blended yarn is prepared as follows: The blended yarn was impregnated in a finishing solution. The blended yarn, by weight, consisted of 100 parts cashmere fiber, 28 parts modified nylon fiber, and 14 parts flax fiber. The yarn had a fineness of 35 English count and was produced by ring spinning. The spinning process involved opening, carding, drawing, roving, and spinning. The finishing solution consisted of deionized water (2000:100:0.4 by mass), 1,2,3,4-butanetetracarboxylic acid, and dispersant AEO-9. The impregnation bath ratio was 1:19, the impregnation temperature was 32℃, and the impregnation time was 40 minutes. After impregnation, the blended yarn was removed, centrifuged to remove water, baked at 170℃ for 3 minutes, washed four times with deionized water, and then dried at 60℃ to obtain a high-strength, breathable cashmere blended yarn.

[0032] The preparation method of the modified nylon fiber in this embodiment is completely consistent with the preparation method of the modified nylon fiber in Example 2.

[0033] Example 6 A high-strength, breathable cashmere blended yarn is prepared as follows: The blended yarn was impregnated in a finishing solution. The blended yarn, by weight, consisted of 100 parts cashmere fiber, 32 parts modified nylon fiber, and 15 parts flax fiber. The yarn had a fineness of 35 English count and was produced by ring spinning. The spinning process involved opening, carding, drawing, roving, and spinning. The finishing solution consisted of deionized water (2000:100:0.4 by mass), 1,2,3,4-butanetetracarboxylic acid, and dispersant AEO-9. The impregnation bath ratio was 1:19, the impregnation temperature was 32℃, and the impregnation time was 50 minutes. After impregnation, the blended yarn was removed, centrifuged to remove water, baked at 700℃ for 3 minutes, washed four times with deionized water, and then dried at 60℃ to obtain a high-strength, breathable cashmere blended yarn.

[0034] The preparation method of the modified nylon fiber in this embodiment is completely consistent with the preparation method of the modified nylon fiber in Example 2.

[0035] Example 7 A high-strength, breathable cashmere blended yarn is prepared as follows: The blended yarn was impregnated in a finishing solution. The blended yarn, by weight, consisted of 100 parts cashmere fiber, 35 parts modified nylon fiber, and 16 parts flax fiber. The fineness of the blended yarn was 40 English count. It was produced by ring spinning, and the spinning process involved opening, carding, drawing, roving, and spinning in sequence. The finishing solution consisted of deionized water, 1,2,3,4-butanetetracarboxylic acid, and dispersant AEO-9 in a mass ratio of 2100:100:0.5. The impregnation bath ratio was 1:20, the impregnation temperature was 35℃, and the impregnation time was 30 minutes. After the impregnation treatment, the blended yarn was removed, centrifuged to remove water, baked at 180℃ for 2 minutes, washed 5 times with deionized water, and dried at 60℃ to obtain a high-strength, breathable cashmere blended yarn.

[0036] The preparation method of the modified nylon fiber in this embodiment is completely consistent with the preparation method of the modified nylon fiber in Example 3.

[0037] Comparative Example 1 A modified nylon fiber, the preparation method of which includes the following steps: S1. After mixing deionized water and surfactant Tween-80 evenly, add a mixture of citric acid, n-octadecane, and anhydrous ethanol dropwise. Heat the mixture and stir at 60℃ and 400r / min for 1h. Add 10wt% sodium silicate solution and graphene oxide dispersion. The mass ratio of deionized water, surfactant, citric acid, n-octadecane, anhydrous ethanol, sodium silicate solution, and graphene oxide dispersion is 120:2:3:11:21:50:100. After mixing evenly, transfer the mixture to a polytetrafluoroethylene reactor and carry out a hydrothermal reaction at 150℃ for 14h. After the reaction is completed, cool, filter, wash three times with deionized water and anhydrous ethanol respectively, and vacuum dry at 60℃ for 12h to obtain silica-graphene oxide composite particles. S2. Nylon chips and silica-graphene oxide composite particles with a mass ratio of 100:5 are added to a twin-screw extruder and melt-blended at 240°C. The mixture is then extruded, and the melt is pumped into a spinning machine and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 0.8 m / s and a temperature of 22°C to obtain modified nylon fibers.

[0038] Comparative Example 2 A modified nylon fiber, the preparation method of which includes the following steps: S1. Nylon chips, nano-silica, and graphene oxide in a mass ratio of 100:4.1:0.9 are added to a twin-screw extruder and melt-blended at 240°C. The mixture is then extruded, and the melt is pumped into a spinning machine and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 0.8 m / s and a temperature of 22°C to obtain modified nylon fibers.

[0039] Comparative Example 3 A high-strength, breathable cashmere blended yarn is made by replacing the modified nylon fiber used in Example 6 with the modified nylon fiber prepared in Comparative Example 1 in equal amounts, while the other components and preparation methods are completely the same as in Example 6.

[0040] Comparative Example 4 A high-strength, breathable cashmere blended yarn is made by replacing the modified nylon fiber used in Example 6 with the modified nylon fiber prepared in Comparative Example 2 in equal amounts, while the other components and preparation methods are completely the same as in Example 6.

[0041] Comparative Example 5 A high-strength, breathable cashmere blended yarn, compared to Example 6, was not subjected to finishing solution impregnation treatment, but the remaining components and preparation method were completely consistent with Example 6.

[0042] The graphene oxide used in the examples and comparative examples of this invention was purchased from Shanghai Xiangtian Nanomaterials Co., Ltd., catalog number XT-GO-01; the nylon chips were purchased from Changle Liheng Nylon Technology Co., Ltd., and were of spinning grade; the flax fiber was purchased from Jingde County Yuyan Hemp Industry Co., Ltd., with a diameter of 5-32 μm and an average length of 5 mm; the cashmere fiber was purchased from Inner Mongolia Beiping Textile Co., Ltd., with a fineness of 20 μm and an average length of 50 mm; other undisclosed reagents were all commercially available.

[0043] The high-strength, breathable cashmere blended yarns prepared in Examples 4-7 and Comparative Examples 3-5 were subjected to relevant performance tests, and the test results are shown below: (1) Air permeability test: The high-strength, air-permeable cashmere blended yarns prepared in Examples 4-7 and Comparative Examples 3-5 were woven into plain weave fabrics of the same specifications to obtain corresponding samples. The test standard was based on GB / T 5453-1997 "Textiles - Determination of Air Permeability of Fabrics". A YG461E fabric air permeability tester was used, and the sample area was 20 cm². 2 The test pressure was 100 Pa, and the airflow rate (mm / s) through the fabric was measured. Each group was tested three times, and the average value was taken. The air permeability test results are shown in Table 1. Table 1

[0044] According to the test results in Table 1, the samples corresponding to Examples 4-7 have excellent air permeability. Comparative Example 3 used the unmodified composite particles from Comparative Example 1. The compatibility between the composite particles and nylon was reduced, and agglomeration led to fiber pore blockage, resulting in decreased air permeability. Comparative Example 4 directly added nano-silica and graphene oxide, causing severe particle agglomeration, increased fiber density, and a significant decrease in air permeability. Comparative Example 5 was not impregnated with finishing solution, but the fiber itself still contained modified components, resulting in reduced air permeability. (2) Mechanical property testing: The testing standard refers to GB / T 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles". The testing instrument is YG061 electronic single yarn strength tester. The testing conditions are as follows: clamping distance 500mm, tensile speed 500mm / min, pre-tension 0.5cN / tex, three tests for each group, and the average value is taken. The test results are shown in Table 2. Table 2 According to the test results in Table 2, the samples corresponding to Examples 4-7 have excellent mechanical properties, with high breaking strength and elongation at break. Comparative Example 3's composite particles, without epoxy modification, are prone to detachment, weakening the fiber's overall integrity. Comparative Example 4's particles easily aggregate, forming stress concentration points, leading to easy breakage and significantly reduced breaking strength and elongation at break. Comparative Example 5, without finishing liquid crosslinking, shows increased inter-fiber slippage and reduced breaking strength.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A high-strength, breathable cashmere blended yarn, characterized in that: The high-strength breathable cashmere blended yarn is obtained by impregnating the blended yarn in a finishing solution; the blended yarn, by weight, includes 100 parts cashmere fiber, 25-35 parts modified nylon fiber, and 12-16 parts flax fiber. The method for preparing the modified nylon fiber includes the following steps: S1. After stirring and mixing deionized water and surfactant evenly, add citric acid, n-octadecane and anhydrous ethanol mixture dropwise, heat and stir at 60℃ and 400r / min for 1h, add 10wt% sodium silicate solution and graphene oxide dispersion, mix evenly, transfer to polytetrafluoroethylene reactor for hydrothermal reaction, after the reaction is completed, cool, filter, wash and dry to obtain silica-graphene oxide composite particles; S2. The silica-graphene oxide composite particles were ultrasonically dispersed in an ethanol solution, the pH was adjusted to 3-4 using acetic acid solution, and then γ-glycidyl etheroxypropyltrimethoxysilane was added. The mixture was heated and stirred to allow the reaction to occur. After the reaction was completed, the particles were centrifuged, washed, and dried to obtain epoxy-modified silica-graphene oxide composite particles. S3. Nylon chips and epoxy-modified silica-graphene oxide composite particles are added to a twin-screw extruder for melt blending and extrusion. The melt is then fed into a spinning machine via a metering pump and ejected through a spinneret. Side-blowing cooling is used at a wind speed of 0.5-1.0 m / s and a temperature of 20-25℃ to obtain modified nylon fibers.

2. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: The mass ratio of deionized water, surfactant, citric acid, n-octadecane, anhydrous ethanol, sodium silicate solution, and graphene oxide dispersion in S1 is 80-150:1-3:2-4:9-12:15-25:35-65:

100.

3. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: The surfactant in S1 is Tween-80.

4. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: The hydrothermal reaction in S1 is carried out at a temperature of 140-160℃ for 12-15 hours.

5. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: In the S2 reaction, the mass ratio of silica-graphene oxide composite particles, ethanol solution, and γ-glycidyl etheroxypropyltrimethoxysilane is 100:1500-1600:16-21, the reaction temperature is 60-70℃, and the reaction time is 4-6h.

6. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: In S3, the mass ratio of nylon chips to epoxy-modified silica-graphene oxide composite particles is 100:2-7, and the melt blending temperature is 235-245℃.

7. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: Before blending, the flax fibers are first softened by oiling and moisturizing, and then combed using a combing machine.

8. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: The finishing solution is composed of deionized water, 1,2,3,4-butanetetracarboxylic acid, and a dispersant in a mass ratio of 1800-2100:100:0.3-0.

5.

9. The high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: During the impregnation process, the impregnation bath ratio is 1:18-20, the impregnation temperature is 30-35℃, and the impregnation time is 30-60 minutes. After the impregnation process is completed, the blended yarn is taken out, centrifuged to dehydrate, baked at 160-180℃ for 2-4 minutes, washed with deionized water 3-5 times, and then dried at 60℃.

10. A high-strength, breathable cashmere blended yarn according to claim 1, characterized in that: The blended yarn has a fineness of 32-40 English count and is produced by ring spinning, with the spinning process involving opening, carding, drawing, roving, and spinning in sequence.

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