Blending process of aerogel fibers and cashmere fibers

Abstract

The invention relates to the field of spinning, in particular to an aerogel fiber and cashmere fiber blending process which comprises the following steps: step (1), performing plasma surface treatment on cashmere fibers to obtain pretreated cashmere fibers: step (2), performing surface modification on the pretreated cashmere fibers to obtain aerogel modified cashmere fibers; 3, the plasma modified cashmere fibers and the aerogel modified cashmere fibers are subjected to opening treatment, carding and drawing according to the mass ratio of 8-10: 1, then roving, spinning and spooling are sequentially conducted, and a finished product is obtained through shaping. The aerogel modified cashmere fiber is prepared by optimizing a plurality of surface modification processes such as plasma surface modification, acrylic acid and silane coupling agent soaking and the like of the cashmere fiber and consolidating aerogel by utilizing a carbon dioxide atmosphere, so that the compatibility of the cashmere fiber and the aerogel is improved; the heat insulation performance, the mechanical property and the washing resistance are improved.

Description

Technical Field

[0001] The present invention relates to the field of textiles, and in particular to a blending process of aerogel fibers and cashmere fibers. Background Art

[0002] Cashmere fiber is a layer of fine wool that grows at the base of the coarse hair on the outer skin of goats. It is a rare special animal fiber, which results in a high cost for pure cashmere yarn, making it relatively expensive for ordinary consumers. Silica aerogel has good thermal insulation properties, but it is difficult and more expensive to make fibers directly from it, and its compatibility with cashmere fibers is also poor. How to use aerogel fibers to replace part of the cashmere fibers to improve thermal insulation performance while ensuring the spinning strength and elongation of the cashmere fibers is a technical problem. CN 116770477 A A semi-worsted production process for wool and cashmere aerogel fiber blended yarn, including raw material selection, raw material pretreatment, cotton opening and cleaning, carding, drawing, roving process, spinning process, winding process, and shaping; wool fibers and cashmere fibers are treated separately. Wool treatment agents include deionized water, wool oil, organophosphorus compounds, fatty alcohol polyoxyethylene ethers, enzymes, hydrogen peroxide, and acetic acid; cashmere treatment agents include weak alkaline electrolyzed water, wool oil, polyoxyethylene stearate, polyoxyethylene laurate, α-olefin sulfonates, and polyoxyethylene sorbitan monolaurate. Pretreatment of wool can reduce pilling, and pretreatment of cashmere facilitates a smooth spinning process. By selecting appropriate processes, the resulting blended yarn exhibits good evenness. However, the paper does not address a method for modifying cashmere fibers with aerogels. Summary of the Invention

[0003] In order to solve the above problems, the present invention proposes a blending process of aerogel fiber and cashmere fiber. By optimizing the plasma surface modification of cashmere fiber, acrylic acid, silane coupling agent soaking and other surface modification processes, and simultaneously using carbon dioxide atmosphere to consolidate aerogel, aerogel-modified cashmere fiber is obtained, which improves the compatibility of cashmere fiber and aerogel, and improves the thermal insulation performance, mechanical properties and wash resistance.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0006] Step (1): 1 part of chopped 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 are mixed by weight, stirred and ultrasonicated, and then poured into a movable sieve at a uniform speed and dried to obtain a thin layer of cashmere fiber, which is then subjected to plasma surface treatment to obtain pretreated cashmere fiber:

[0007] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent ethanol aqueous solution with a mass concentration of 3-5%, adjusting the pH to 4.5-5.5 with acetic acid, taking it out after complete infiltration and drying it, immersing it in an acrylic acid solution with a mass concentration of 10-20%, taking it out after complete infiltration, letting it stand on a sieve for 2-3 hours, then washing it, immersing it in a sodium silicate solution, adjusting the pH to 5-6, stirring it for 1-2 hours, filtering it out, letting it stand to dry, and dispersing it to obtain aerogel-modified cashmere fiber;

[0008] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 8-10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain the finished product, i.e., aerogel-cashmere blended yarn.

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

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

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

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

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

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

[0015] Preferably, the mixture is stirred every 20-30 minutes while standing on the sieve for 2-3 hours.

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

[0017] As a preferred modification process of the plasma modified cashmere fiber, the modification process is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, 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 fibers and cashmere fibers.

[0019] Compared with the existing technology, the technical advantages of this solution are:

[0020] 1. This solution optimizes the plasma surface modification of cashmere fibers, and multiple surface modification processes such as acrylic acid and silane coupling agent soaking. It also uses a carbon dioxide atmosphere to consolidate aerogel to produce aerogel-modified cashmere fibers. This improves the compatibility of cashmere fibers and aerogels, thereby enhancing thermal insulation, mechanical properties, and washability.

[0021] 2. The preparation process of this scheme is simple, and it mainly solves the compatibility problem between cashmere fiber and aerogel fiber, making it adaptable to traditional spinning process. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0023] Example 1

[0024] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0025] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0026] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 11%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0027] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0028] Example 2

[0029] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0030] Step (1): by weight, 1 part of chopped cashmere fiber, 20 parts of water, 0.5 parts of dodecylbenzenesulfonic acid, 0.5 parts of polyethylene glycol and 20 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh mobile sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.8 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.8 g / dm 2 ;

[0031] Step (2): immersing the pretreated cashmere fiber in a 5% ethanol aqueous solution of a silane coupling agent KH-550, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, drying it, immersing it in a 20% acrylic acid solution, taking it out after complete immersion, standing it on a sieve for 2.5 hours, stirring it every 20 minutes, then washing it, immersing it in a 12% sodium silicate solution, adjusting the pH to 5.5, stirring it for 2 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes a mass concentration of 0.5% potassium persulfate and a mass concentration of 0.3% sodium silicate;

[0032] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 9:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0033] Example 3

[0034] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0035] Step (1): by weight, 1 part of chopped cashmere fiber, 15 parts of water, 0.1 parts of dodecylbenzenesulfonic acid, 0.1-0.5 parts of polyethylene glycol and 10 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh mobile sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.2 g / dm 2 ;

[0036] Step (2): immersing the pretreated cashmere fiber in an ethanol aqueous solution containing a silane coupling agent KH-550 with a mass concentration of 3-5%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it. Then, immersing it in an acrylic acid solution with a mass concentration of 10%, taking it out after complete immersion, and letting it stand on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it. Then, immersing it in a sodium silicate solution with a mass concentration of 10%, adjusting the pH to 5.5, stirring it for 2 hours, filtering it out, letting it stand to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.2% and sodium silicate with a mass concentration of 0.1%;

[0037] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 8:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0038] Example 4

[0039] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0040] Step (1): by weight, 1 part of chopped cashmere fiber, 18 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.4 parts of polyethylene glycol and 13 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 3.9 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0041] Step (2): Immerse the pretreated cashmere fiber in a 3-5% ethanol aqueous solution of silane coupling agent KH-550, adjust the pH to 5 with acetic acid, take it out after it is completely soaked, dry it, immerse it in a 13% acrylic acid solution, take it out after it is completely soaked, let it stand on the sieve for 3 hours, and stir it every 20 minutes.

[0042] The fibers were 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 2 hours. The fibers were filtered out, 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 0.4% persulfate by mass and 0.2% sodium silicate by mass.

[0043] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 9:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0044] Comparative Example 1

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

[0046] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0047] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh sieve at a uniform speed and dried to obtain cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm2;

[0048] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 11%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0049] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0050] Comparative Example 2

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

[0052] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0053] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0054] Step (2): immersing the pretreated cashmere fiber in a mass ethanol aqueous solution, adjusting the pH to 5 with acetic acid, taking out after complete immersion and drying, immersing in an acrylic acid solution with a mass concentration of 15%, taking out after complete immersion, standing on a sieve for 2.5 hours, stirring once every 20 minutes, then washing, immersing in a sodium silicate solution with a mass concentration of 11%, adjusting the pH to 5.5, stirring for 1.5 hours, filtering out, standing to dry, and dispersing to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0055] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0056] Comparative Example 3

[0057] The difference from Example 1 is that no immersion in acrylic acid solution is performed:

[0058] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0059] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0060] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, drying it, leaving it on a sieve for 2.5 hours, stirring it every 20 minutes, then washing it, immersing it in a sodium silicate solution with a mass concentration of 11%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, leaving it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0061] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0062] Comparative Example 4

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

[0064] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0065] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0066] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 15%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0067] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0068] Comparative Example 5

[0069] The difference from Example 1 is that the mixture is immersed in a sodium silicate solution with a mass concentration of 8%:

[0070] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0071] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0072] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 8%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0073] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0074] Comparative Example 6

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

[0076] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0077] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0078] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 8%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0079] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 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 of aerogel fiber and cashmere fiber comprises the following steps:

[0083] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm2 ;

[0084] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 8%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3%;

[0085] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

[0086] Comparative Example 8

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

[0088] A blending process of aerogel fiber and cashmere fiber comprises the following steps:

[0089] Step (1): by weight, 1 part of chopped cashmere fiber, 17 parts of water, 0.3 parts of dodecylbenzenesulfonic acid, 0.3 parts of polyethylene glycol and 15 parts of alcohol are mixed, stirred and ultrasonicated, and then poured into a 120-mesh movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then plasma surface treated with a normal pressure plasma jet to obtain pretreated cashmere fiber: the average length of the chopped cashmere fiber is 4.2 mm; the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50 W, and the treatment is 1 min; the unit area mass of the cashmere fiber thin layer is 1.5 g / dm 2 ;

[0090] Step (2): immersing the pretreated cashmere fiber in a silane coupling agent KH-550 ethanol aqueous solution with a mass concentration of 4%, adjusting the pH to 5 with acetic acid, taking it out after complete immersion, and drying it, immersing it in an acrylic acid solution with a mass concentration of 15%, taking it out after complete immersion, and standing it on a sieve for 2.5 hours, stirring it every 20 minutes, and then washing it, immersing it in a sodium silicate solution with a mass concentration of 8%, adjusting the pH to 5.5, stirring it for 1.5 hours, filtering it out, standing it to dry, and dispersing it to obtain aerogel-modified cashmere fiber; the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes potassium persulfate with a mass concentration of 0.3% and sodium silicate with a mass concentration of 0.2%;

[0091] Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain a finished product; 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, a power of 50 W, and a treatment time of 3 minutes.

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

[0093] Table 1

[0094]

[0095]

[0096] Performance testing:

[0097] 1. Use a thermal conductivity tester to measure the thermal conductivity of the blended material, with a target of 0.04W / m·K;

[0098] 2. Use the oven method to measure the moisture absorption properties of the blended material, with the moisture regain target at 15-18%;

[0099] 3. Use a constant rate of extension (CRE) tensile testing machine to test the mechanical properties of the blended material, including breaking strength and elongation. The breaking strength must be ≥3.2 cN / dtex and the elongation must be ≥12.5%.

[0100] 4. Durability: Wash the yarn 5 times and re-measure the above indicators.

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

[0102] Table 2

[0103]

[0104]

[0105] The results of Examples 1-4 and Comparative Examples 1-8 show that Examples 1-4 of this solution can achieve better mechanical properties, low thermal conductivity, and washability. Compared with cashmere fiber spinning, the main sacrifice is a certain elongation at break, but the other indicators are better.

[0106] Compared with Example 1, Comparative Example 1 did not control the thickness of the cashmere fiber thin layer, resulting in uneven plasma treatment of the cashmere fiber surface, causing uneven or no effective loading of the subsequent aerogel, resulting in a decrease in thermal conductivity. The unevenness will also lead to an increase in stress concentration points, which in turn leads to low breaking strength and poor wash resistance.

[0107] Compared with Example 1, Comparative Example 2 does not add a silane coupling agent, which may result in poor interfacial bonding between the aerogel and the cashmere fiber, and the aerogel layer is easy to fall off, resulting in poor overall performance.

[0108] Compared to Example 1, Comparative Example 3 was not immersed in an acrylic acid solution, which made the aerogel cross-linked network more fragile and more prone to fragmentation, leading to aerogel shedding or fiber breakage, resulting in overall performance degradation. Compared to Example 1, Comparative Example 7 did not contain sodium silicate in the acrylic acid solution, which reduced its ability to bind to the subsequent aerogel and decreased performance stability, resulting in performance results inferior to those of Example 1.

[0109] Compared with Example 1, Comparative Example 4 was immersed in a sodium silicate solution with a mass concentration of 15%, and the sodium silicate content was too high, the sol viscosity was high, the brittleness was large, and it was easy to break; Comparative Example 5 also caused part of the aerogel-modified cashmere fiber to fall off easily due to insufficient strength of the aerogel cross-linked network structure, resulting in insufficient overall performance.

[0110] Compared with Example 1, Comparative Example 6 was not dried under a carbon dioxide environment, the aerogel was not fully solidified, the porosity was reduced, the thermal conductivity was slightly higher, and the performance after washing was greatly different, indicating poor wash resistance.

[0111] Compared with Example 1, in Comparative Example 8, the amount of aerogel-modified cashmere fiber is excessive, which results in a large proportion of brittle aerogel and reduces the elongation.

Claims

1. A blending process of aerogel fiber and cashmere fiber, characterized in that: The following steps are involved: Step (1): 1 part of chopped 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 are mixed by weight, stirred and ultrasonicated, and then poured into a movable sieve at a uniform speed, dried to obtain a thin layer of cashmere fiber, and then subjected to plasma surface treatment to obtain pretreated cashmere fiber: Step (2): immersing the pretreated cashmere fiber in a silane coupling agent ethanol aqueous solution with a mass concentration of 3-5%, adjusting the pH to 4.5-5.5 with acetic acid, taking it out after complete immersion and drying it, immersing it in an acrylic acid solution with a mass concentration of 10-20%, taking it out after complete immersion, letting it stand on a sieve for 2-3 hours, then washing it, immersing it in a sodium silicate solution, adjusting the pH to 5-6, stirring it for 1-2 hours, filtering it out, letting it stand to dry, and dispersing it to obtain aerogel-modified cashmere fiber; Step (3): Plasma-modified cashmere fiber and aerogel-modified cashmere fiber are opened and combed in a mass ratio of 8-10:1, and then subjected to roving, spun yarn, and winding processes in sequence, and then shaped to obtain the finished product.

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

3. The blending process of aerogel fiber and cashmere fiber according to claim 1, characterized in that: The mesh size of the movable screen is 100-200 meshes.

4. The blending process of aerogel fiber and cashmere fiber according to claim 1, characterized in that: The plasma surface treatment uses a normal pressure plasma jet, the plasma gas is an oxygen / nitrogen mixed gas with a volume ratio of 1:1, the power is 50W, and the treatment time is 1 minute.

5. The blending process of aerogel fiber and cashmere fiber according to 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 according to claim 1, characterized in that: The silane coupling agent is KH-550, the mass percentage of ethanol in the ethanol aqueous solution is 10%; the acrylic acid solution also includes persulfate with a mass concentration of 0.1-0.5% and sodium silicate with a mass concentration of 0.1-0.3%.

7. The blending process of aerogel fiber and cashmere fiber according to claim 1, characterized in that: While standing on the sieve for 2-3 hours, stir it every 20-30 minutes.

8. The blending process of aerogel fiber and cashmere fiber according to claim 1, characterized in that: The mass concentration of the sodium silicate solution is 10-12%.

9. The blending process of aerogel fiber and cashmere fiber according to claim 1, characterized in that: The modification process of the plasma-modified cashmere fiber is as follows: oxygen / nitrogen mixed gas with a volume ratio of 1:1, a power of 50W, and a treatment time of 3 minutes.

10. An aerogel-cashmere blended yarn prepared by the blending process of aerogel fiber and cashmere fiber according to any one of claims 1 to 9.

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