Aerogel fiber and cashmere fiber blending process

Abstract

The application relates to the field of textiles, in particular to a spinning process of aerogel fibers and cashmere fibers, which comprises the following steps: step (1): cashmere fibers are subjected to plasma surface treatment to obtain pretreated cashmere fibers; step (2): the surface of the pretreated cashmere fibers is modified to obtain aerogel modified cashmere fibers; step (3): the plasma modified cashmere fibers and the aerogel modified cashmere fibers are subjected to opening treatment, carding and then drawing, and then are subjected to the processes of roving, spinning, bobbin winding in sequence, and are subjected to setting to obtain finished products. The application optimizes the plasma surface modification of cashmere fibers, adopts a multi-channel surface modification process of acrylic acid and silane coupling agent soaking, and also uses a carbon dioxide atmosphere to consolidate the aerogel, so that the aerogel modified cashmere fibers are prepared, the compatibility of the cashmere fibers and the aerogel is improved, and the heat insulation performance, the mechanical performance and the washing resistance are all improved.

Description

Technical Field

[0001] This invention relates to the textile field, specifically to a blending process of aerogel fibers and cashmere fibers. Background Technology

[0002] Cashmere fiber is a layer of fine down growing at the base of the coarse hair on the outer skin of goats. It is a rare and special animal fiber, resulting in high costs for pure cashmere yarn, making it expensive for ordinary consumers. Silica aerogel has good thermal insulation properties, but it is difficult and more expensive to directly produce fibers from it, and its compatibility with cashmere fibers is also poor. How to improve thermal insulation performance by replacing part of the cashmere fiber with aerogel fiber while ensuring the strength and elongation of the cashmere yarn is a technical challenge. CN 116770477 A describes a semi-worsted spinning process for wool and cashmere aerogel fiber blended yarn, including raw material selection, raw material pretreatment, opening and cleaning, carding, drawing, roving, spinning, winding, and setting; and performing wool and cashmere fiber finishing treatments separately. Wool pretreatment agents include deionized water, wool-refining oil, organophosphorus compounds, fatty alcohol polyoxyethylene ethers, enzymes, hydrogen peroxide, and acetic acid; cashmere pretreatment agents include weakly alkaline electrolyzed water, wool-refining oil, polyoxyethylene stearate, polyoxyethylene laurate, α-alkenyl sulfonate, and polyoxyethylene dehydrated sorbitan monolaurate. Pretreatment of wool can reduce pilling, and pretreatment of cashmere facilitates the spinning process. With appropriate process selection, the prepared blended yarn can have good evenness. However, it does not propose a method for aerogel modification of cashmere fibers. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a blending process for aerogel fibers and cashmere fibers. By optimizing the plasma surface modification of cashmere fibers and employing multiple surface modification processes such as soaking in acrylic acid and silane coupling agents, while simultaneously utilizing a carbon dioxide atmosphere to consolidate the aerogel, aerogel-modified cashmere fibers are obtained. This process improves the compatibility between cashmere fibers and aerogel, thereby enhancing thermal insulation, mechanical properties, and washability.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0006] Step (1): By weight, mix 1 part of shredded cashmere fiber, 15-20 parts of water, 0.1-0.5 parts of surfactant, 0.1-0.5 parts of polyethylene glycol, and 10-20 parts of alcohol. After stirring and sonicating, pour the mixture evenly into a moving screen and dry it to obtain a thin layer of cashmere fiber. Then, perform plasma surface treatment to obtain pretreated cashmere fiber.

[0007] Step (2): Immerse the pretreated cashmere fibers in a 3-5% (w / w) silane coupling agent ethanol aqueous solution, adjust the pH to 4.5-5.5 with acetic acid, remove and dry after complete immersion, immerse in a 10-20% (w / w) acrylic acid solution, remove after complete immersion, let stand on a sieve for 2-3 hours, then wash, immerse in a sodium silicate solution, adjust the pH to 5-6, stir for 1-2 hours, filter, remove, let stand and dry, disperse to obtain aerogel modified cashmere fibers;

[0008] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 8-10:1, and after opening and combing, they are drawn into slivers. Then, after passing through roving, spinning and winding processes, the finished product, namely aerogel-cashmere blended yarn, is obtained.

[0009] Preferably, the average length of the shredded cashmere fibers is 3-5 mm; the surfactant is dodecylbenzenesulfonic acid.

[0010] Preferably, the mesh size of the mobile screen is 100-200 mesh.

[0011] Preferably, the plasma surface treatment uses an atmospheric pressure plasma jet, the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50W, and the treatment time is 1 minute.

[0012] Preferably, the unit area mass of the cashmere fiber thin layer is 1-2 g / dm². 2 .

[0013] Preferably, the silane coupling agent is KH-550, and the ethanol aqueous solution contains 10% ethanol by mass.

[0014] Preferably, the acrylic acid solution further includes persulfate at a mass concentration of 0.1-0.5% and sodium silicate at a mass concentration of 0.1-0.3%.

[0015] As a preferred method, the mixture should be stirred every 20-30 minutes during the 2-3 hour standing process on the sieve.

[0016] Preferably, the sodium silicate solution has a mass concentration of 10-12%.

[0017] Preferably, the plasma-modified cashmere fiber modification process is as follows: a 1:1 volume ratio oxygen / nitrogen mixed gas, a power of 50W, and a treatment time of 3 minutes.

[0018] This solution also provides an aerogel-cashmere blended yarn prepared by the above-mentioned blending process of aerogel fiber and cashmere fiber.

[0019] Compared to existing technologies, the technical advantages of this solution are:

[0020] 1. This solution optimizes the plasma surface modification of cashmere fibers, and uses multiple surface modification processes such as soaking in acrylic acid and silane coupling agents. At the same time, it also uses a carbon dioxide atmosphere to consolidate the aerogel, thus obtaining aerogel-modified cashmere fibers. This improves the compatibility between cashmere fibers and aerogel, thereby enhancing the thermal insulation performance, mechanical properties and washability.

[0021] 2. The preparation process of this solution is simple, and it mainly solves the compatibility problem between cashmere fiber and aerogel fiber, enabling it to adapt to traditional spinning processes. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0025] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0026] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in a sodium silicate solution with a mass concentration of 11%. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0027] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0028] Example 2

[0029] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0030] Step (1): By weight, mix 1 part shredded cashmere fiber, 20 parts water, 0.5 parts dodecylbenzenesulfonic acid, 0.5 parts polyethylene glycol, and 20 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.8 mm; the plasma gas is a 1:1 volume ratio of oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.8 g / dm³. 2 ;

[0031] Step (2): The pretreated cashmere fibers were immersed in a 5% KH-550 ethanol aqueous solution containing silane coupling agent. The pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in a 20% acrylic acid solution. After complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes. After washing, the fibers were immersed in a 12% sodium silicate solution. The pH was adjusted to 5.5. After stirring for 2 hours, the fibers were filtered, removed, and allowed to stand and dry. The fibers were then dispersed to obtain aerogel-modified cashmere fibers. The ethanol aqueous solution contained 10% ethanol. The acrylic acid solution also contained 0.5% potassium persulfate and 0.3% sodium silicate.

[0032] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 9:1, opened and combed, and then drawn into slivers. After passing through roving, spinning and winding processes, the finished product is obtained. The average length of the plasma-modified cashmere fiber is 4.8 mm. The plasma-modified cashmere fiber modification process is: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0033] Example 3

[0034] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0035] Step (1): By weight, mix 1 part shredded cashmere fiber, 15 parts water, 0.1 parts dodecylbenzenesulfonic acid, 0.1-0.5 parts polyethylene glycol, and 10 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.2 g / dm³. 2 ;

[0036] Step (2): Immerse the pretreated cashmere fibers in an ethanol-water solution of silane coupling agent KH-550 with a mass concentration of 3-5%, adjust the pH to 5 with acetic acid, remove and dry after complete immersion, immerse in an acrylic acid solution with a mass concentration of 10%, remove after complete immersion, let stand on a sieve for 2.5 hours, stir once every 20 minutes, then wash, immerse in a sodium silicate solution with a mass concentration of 10%, adjust the pH to 5.5, stir for 2 hours, filter, remove, stand and dry, disperse to obtain aerogel modified cashmere fibers; the ethanol-water solution contains 10% ethanol by mass; the acrylic acid solution also contains 0.2% potassium persulfate and 0.1% sodium silicate by mass concentration;

[0037] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 8:1, opened and combed, and then drawn into slivers. After passing through roving, spinning and winding processes, the finished product is obtained. The average length of the plasma-modified cashmere fiber is 3.8 mm. The plasma-modified cashmere fiber modification process is: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0038] Example 4

[0039] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0040] Step (1): By weight, mix 1 part shredded cashmere fiber, 18 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.4 parts polyethylene glycol, and 13 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 3.9 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0041] Step (2): Immerse the pretreated cashmere fibers in a 3-5% (w / w) aqueous solution of silane coupling agent KH-550 in ethanol, adjust the pH to 5 with acetic acid, remove and dry after complete immersion, then immerse in a 13% (w / w) acrylic acid solution, remove after complete immersion, and let stand on a sieve for 3 hours, stirring once every 20 minutes.

[0042] After washing, the fibers were immersed in an 11% sodium silicate solution, the pH was adjusted to 5.5, and the mixture was stirred for 2 hours. The fibers were then filtered, allowed to stand and dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol aqueous solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.4% persulfate and 0.2% sodium silicate by mass.

[0043] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 9:1, opened and combed, and then drawn into slivers. After passing through roving, spinning and winding processes, the finished product is obtained. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0044] Comparative Example 1

[0045] The difference from Example 1 is that the thickness of the cashmere fiber sample was not controlled when plasma modification was not performed.

[0046] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0047] Step (1): By weight, mix 1 part of shredded cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol, stir and sonicate, then pour into a 120-mesh sieve at a uniform speed and dry to obtain cashmere fiber. Then, perform plasma surface treatment with atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio of oxygen / nitrogen mixed gas, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm2.

[0048] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in a sodium silicate solution with a mass concentration of 11%. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0049] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0050] Comparative Example 2

[0051] The difference from Example 1 is that no silane coupling agent was added:

[0052] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0053] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0054] Step (2): Immerse the pretreated cashmere fibers in an ethanol-water solution, adjust the pH to 5 with acetic acid, remove and dry after complete immersion, immerse in a 15% acrylic acid solution, remove after complete immersion, let stand on a sieve for 2.5 hours, stir once every 20 minutes, then wash, immerse in an 11% sodium silicate solution, adjust the pH to 5.5, stir for 1.5 hours, filter, remove, let stand and dry, disperse to obtain aerogel-modified cashmere fibers; the ethanol-water solution contains 10% ethanol by mass; the acrylic acid solution also contains 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0055] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0056] Comparative Example 3

[0057] The difference from Example 1 is that it was not immersed in an acrylic acid solution:

[0058] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0059] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0060] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then placed on a sieve and allowed to stand for 2.5 hours, with stirring every 20 minutes. After washing, the fibers were immersed in a sodium silicate solution with a mass concentration of 11%, and the pH was adjusted to 5.5. After stirring for 1.5 hours, the fibers were filtered, allowed to stand and dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0061] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0062] Comparative Example 4

[0063] The difference from Example 1 is that it was immersed in a sodium silicate solution with a mass concentration of 15%:

[0064] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0065] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0066] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in a sodium silicate solution with a mass concentration of 15%. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0067] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0068] Comparative Example 5

[0069] The difference from Example 1 is that it was immersed in an 8% sodium silicate solution:

[0070] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0071] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0072] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in an 8% sodium silicate solution. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0073] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0074] Comparative Example 6

[0075] The difference from Example 1 is that the drying was not carried out in a carbon dioxide environment:

[0076] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0077] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0078] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in an 8% sodium silicate solution. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0079] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0080] Comparative Example 7

[0081] The difference from Example 1 is that the sodium acrylate solution does not contain sodium silicate:

[0082] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0083] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³.2 ;

[0084] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in an 8% sodium silicate solution. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate by mass.

[0085] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0086] Comparative Example 8

[0087] The difference from Example 1 is that the cashmere fiber and aerogel-modified cashmere fiber are in a mass ratio of 7:1, that is, the aerogel-modified cashmere fiber is in excess:

[0088] A blending process for aerogel fibers and cashmere fibers includes the following steps:

[0089] Step (1): By weight, mix 1 part shredded cashmere fiber, 17 parts water, 0.3 parts dodecylbenzenesulfonic acid, 0.3 parts polyethylene glycol, and 15 parts alcohol. After stirring and sonicating, pour the mixture evenly into a 120-mesh moving sieve and dry it to obtain a cashmere fiber thin layer. Then, perform plasma surface treatment using atmospheric pressure plasma jet to obtain pretreated cashmere fiber: the average length of the shredded cashmere fiber is 4.2 mm; the plasma gas is a 1:1 volume ratio oxygen / nitrogen mixture, the power is 50 W, and the treatment time is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm³. 2 ;

[0090] Step (2): The pretreated cashmere fibers were immersed in an ethanol-water solution with a mass concentration of 4% silane coupling agent KH-550, and the pH was adjusted to 5 with acetic acid. After complete immersion, the fibers were removed and dried. They were then immersed in an acrylic acid solution with a mass concentration of 15%, and after complete immersion, the fibers were removed and placed on a sieve for 2.5 hours. The fibers were stirred every 20 minutes, then washed and immersed in an 8% sodium silicate solution. The pH was adjusted to 5.5, and the fibers were stirred for 1.5 hours. After filtration, the fibers were removed, placed to dry, and dispersed to obtain aerogel-modified cashmere fibers. The ethanol-water solution contained 10% ethanol by mass. The acrylic acid solution also contained 0.3% potassium persulfate and 0.2% sodium silicate by mass.

[0091] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are mixed at a mass ratio of 10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product. The average length of the plasma-modified cashmere fiber is 4.3 mm. The plasma-modified cashmere fiber modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, power of 50W, and treatment for 3 minutes.

[0092] In step (3) of Examples 1-4 and Comparative Examples 1-7 above, the equipment and processes for blending are all conventional technologies, and the specific parameters are shown in Table 1:

[0093] Table 1

[0094]

[0095]

[0096] Performance testing:

[0097] 1. Measure the thermal conductivity of the blended material using a thermal conductivity meter, with a target value of 0.04 W / m·K;

[0098] 2. The moisture absorption properties of blended materials were determined using the oven drying method, with a target moisture regain of 15-18%.

[0099] 3. Test the mechanical properties of blended materials using a constant speed elongation (CRE) tensile testing machine, including breaking strength and elongation. The breaking strength should be ≥3.2 cN / dtex and the elongation should be ≥12.5%.

[0100] 4. Durability: After the yarn is washed 5 times, the above indicators are re-measured.

[0101] The performance test results are shown in Table 2.

[0102] Table 2

[0103]

[0104]

[0105] Analysis of the results from Examples 1-4 and Comparative Examples 1-8 shows that Examples 1-4 of this scheme achieve better mechanical properties, lower thermal conductivity, and washability. Compared to cashmere fiber yarn, it mainly sacrifices some elongation at break, but all other indicators are better.

[0106] Compared to Example 1, Comparative Example 1 did not control the thickness of the cashmere fiber thin layer, resulting in uneven plasma treatment on the surface of the cashmere fiber. This led to uneven or ineffective loading of the subsequent aerogel, resulting in decreased thermal conductivity. The unevenness also caused an increase in stress concentration points, which in turn resulted in low breaking strength and poor washability.

[0107] Compared to Example 1, Comparative Example 2 did not add a silane coupling agent, which may result in poor interfacial bonding between the aerogel and cashmere fibers, making the aerogel layer easy to detach and thus leading to poor overall performance.

[0108] Compared to Example 1, Comparative Example 3 was not immersed in an acrylic acid solution, which made the aerogel crosslinking network more fragile and more prone to breakage, leading to aerogel detachment or fiber breakage, resulting in a decrease in overall performance. Compared to Example 1, Comparative Example 7 did not contain sodium silicate in its acrylic acid solution, which resulted in a decrease in its binding ability with subsequent aerogels, leading to a decrease in performance stability, and thus the performance results were inferior to those of Example 1.

[0109] Compared to Example 1, Comparative Example 4, when immersed in a 15% sodium silicate solution, had an excessively high sodium silicate content, resulting in high sol viscosity, brittleness, and easy breakage. Comparative Example 5, due to insufficient strength of the aerogel crosslinking network structure, also caused the aerogel modified cashmere fiber to easily detach, leading to insufficient overall performance.

[0110] Compared to Example 1, Comparative Example 6 was not dried in a carbon dioxide environment, the aerogel was not fully cured, the porosity was reduced, the thermal conductivity was slightly higher, and the performance after washing was significantly different, indicating poor washability.

[0111] Compared to Example 1, Comparative Example 8 had an excessive amount of aerogel-modified cashmere fibers, which resulted in a high proportion of brittle aerogels and a decrease in elongation.

Claims

1. A blending process for aerogel fibers and cashmere fibers, characterized in that, Includes the following steps: Step (1): By weight, mix 1 part of shredded cashmere fiber, 15-20 parts of water, 0.1-0.5 parts of surfactant, 0.1-0.5 parts of polyethylene glycol, and 10-20 parts of alcohol. After stirring and sonicating, pour the mixture evenly into a moving screen and dry it to obtain a thin layer of cashmere fiber. Then, perform plasma surface treatment to obtain pretreated cashmere fiber. Step (2): Immerse the pretreated cashmere fibers in a 3-5% (w / w) silane coupling agent ethanol aqueous solution, adjust the pH to 4.5-5.5 with acetic acid, remove and dry after complete immersion, immerse in a 10-20% (w / w) acrylic acid solution, remove after complete immersion, let stand on a sieve for 2-3 hours, then wash, immerse in a sodium silicate solution, adjust the pH to 5-6, stir for 1-2 hours, filter, remove, let stand and dry, disperse to obtain aerogel modified cashmere fibers; Step (3): The pretreated cashmere fibers and aerogel-modified cashmere fibers are mixed at a mass ratio of 8-10:1, and after opening and combing, they are drawn into slivers. Then, they are successively processed through roving, spinning, and winding processes to obtain the finished product.

2. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The average length of the shredded cashmere fibers is 3-5 mm; the surfactant is dodecylbenzenesulfonic acid.

3. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The mesh size of the mobile screen is 100-200 mesh.

4. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The plasma surface treatment uses an atmospheric pressure plasma jet, with the plasma gas being a 1:1 volume ratio of oxygen / nitrogen mixture, a power of 50W, and a treatment time of 1 minute.

5. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The unit area mass of the cashmere fiber thin layer is 1-2 g / dm. 2 .

6. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The silane coupling agent is KH-550, and the ethanol aqueous solution contains 10% ethanol by mass. The acrylic acid solution also contains 0.1-0.5% persulfate and 0.1-0.3% sodium silicate by mass.

7. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, During the 2-3 hour standing process on the sieve, stir it every 20-30 minutes.

8. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The sodium silicate solution has a mass concentration of 10-12%.

9. The blending process of aerogel fiber and cashmere fiber as described in claim 1, characterized in that, The pre-plasma surface treatment process for obtaining pretreated cashmere fibers involves: a 1:1 volume ratio of oxygen / nitrogen mixed gas, a power of 50W, and a treatment time of 3 minutes.

10. An aerogel-cashmere blended yarn prepared by a blending process of aerogel fiber and cashmere fiber as described in any one of claims 1-9.

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