Washable cashmere fabric

Abstract

The invention provides a water-washed cashmere fabric, which comprises 50-75% of cashmere fiber; 15-30% of wool fiber; 10 to 20% of chemical fiber; the cashmere fibers and the wool fibers are subjected to protease treatment and hydrophobic resin treatment, the hydrophobic resin comprises disulfide bonds, scales of the wool fibers and the cashmere fibers are denudated through hydrophobic resin treatment, and the denudation rate is controlled to be 30-50%; a hydrophobic resin filling structure is formed at the joint of the scales, the water contact angle of the fabric is 90-120 degrees, and the surface of the chemical fiber is grafted with an acrylate copolymer with the grafting rate of 2-5%; the wool fibers and the cashmere fibers are used as weft yarns after being spun, the chemical fibers are used as warp yarns, the number of the weft yarns is 40-60 Nm, the number of the warp yarns is 30-50 Nm, the weft yarns and the warp yarns are interwoven to form the fabric, scales are directionally denudated, high-density disulfide key sites at joints of the scales are exposed, and the hydrophobic resin inhibits washing and felting.

Description

Technical Field

[0001] This invention relates to the field of cashmere fabric production technology, specifically to a washed cashmere fabric. Background Technology

[0002] Cashmere fabric is highly regarded for its lightweight softness, excellent warmth, and luxurious feel. Its raw material primarily comes from the undercoat of goats (known as cashmere or cashmere). Compared to regular wool, cashmere fibers are finer, typically 15-16 micrometers in diameter, only half the size of wool fibers. Their surface scales are also denser and more neatly arranged, giving them a unique smooth feel and excellent breathability. However, cashmere's microstructure and chemical properties also make it extremely sensitive to washing methods. Traditional water washing easily causes fiber shrinkage, felting, and a deterioration in hand feel, thus requiring long-term dry cleaning for maintenance.

[0003] Cashmere fibers have a regular, scaly structure covering their longitudinal surface, with the edges of the scales slightly upturned, pointing towards the fiber end. This structure creates a directional friction effect between the fibers, with a low coefficient of friction along the scale direction and a significantly increased coefficient against it, giving cashmere fabrics excellent abrasion resistance and anti-slip properties. However, when exposed to water, the scale layer absorbs water and swells, disrupting hydrogen bonds and causing a sharp increase in sliding resistance between fibers, leading to entanglement and felting. Furthermore, the cortex of cashmere is composed of keratin, containing a large amount of hydrophilic amino acids; its moisture absorption and swelling during washing exacerbates fiber deformation.

[0004] During the washing process, the wetting effect of water causes the fiber scales to open, and mechanical rubbing causes the scales to interlock, forming an irreversible felt-like structure. Simultaneously, the keratin in cashmere is prone to peptide chain breakage under humid and hot conditions, reducing fiber strength. Experiments show that cashmere fabrics shrink in area after washing, and the alkaline components in conventional detergents can damage the weakly acidic protective film on the fiber surface, further exacerbating the damage.

[0005] Currently, research and existing technologies for overcoming the limitations of washing include: reacting epoxy resin or silane coupling agents with fibers to form a three-dimensional network structure, restricting scale layer movement; using proteases to directionally hydrolyze exposed peptide bonds on the fiber surface to reduce scale warping; coating fibers with graphene oxide or silica sol to form a hydrophobic barrier; and etching the fiber surface with argon plasma to increase roughness and enhance inter-fiber cohesion while sealing gaps between scale layers. However, resin crosslinking reduces fabric flexibility, bio-enzyme treatment may damage the main fiber structure, and nano-coatings affect air permeability. Therefore, it is necessary to provide improvements to the above technologies. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art. In a first aspect, it provides a washable cashmere fabric; in a second aspect, it provides a method for preparing the fabric.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows.

[0008] A washed cashmere fabric, by weight percentage, comprises cashmere fiber, 50-75%; wool fiber, 15-30%; and chemical fiber, 10-20%. The cashmere and wool fibers are treated with protease and hydrophobic resin, the hydrophobic resin containing disulfide bonds. The hydrophobic resin treatment causes the scales of the wool and cashmere fibers to erode, with the erosion rate controlled at 30-50%. A hydrophobic resin filling structure is formed at the scale seams, and the water contact angle of the fabric is 90°-120°. The surface of the chemical fiber is grafted with an acrylate copolymer with a grafting rate of 2-5%. The wool and cashmere fibers are spun into weft yarns, and the chemical fiber is used as warp yarns. The weft yarn count is 40-60 Nm, and the warp yarn count is 30-50 Nm. The weft and warp yarns are interwoven to form the fabric.

[0009] Compared with existing technologies, the main component of wool and cashmere fibers is keratin, whose molecular chains are cross-linked through disulfide bonds, hydrogen bonds, van der Waals forces, etc., to form a three-dimensional network structure. The scale layer, as the outermost layer of the fiber, has a disulfide bond density of 1.2-1.8 mmol / g at the scale seams (overlapping scale areas), significantly higher than the 0.5-0.8 mmol / g of the cortex layer. This invention removes the scale layer from the fiber surface through isomild enzymatic hydrolysis with proteases, preferentially hydrolyzing exposed hydrophobic amino acids (such as alanine and leucine) in the scale layer, while having a weaker effect on areas in the cortex layer rich in hydrophilic amino acids (such as glutamic acid and aspartic acid). This controls the scale erosion rate to 30-50%. After erosion, the disulfide bond network at the scale seams is destroyed, increasing the surface binding energy. Subsequently, the wool and cashmere fibers are treated with a hydrophobic resin containing disulfide bonds, forming a resin-filled structure at the eroded scale seams. While improving the hydrophobicity of the fiber surface, the hydrophobic resin is oriented to adhere by relying on the disulfide bond structure.

[0010] Hydrophobic resin fills the rough spots after scale erosion through capillary action, forming a microphase separation structure on the fiber surface. At the same time, resin filling inhibits scale regeneration and pilling problems.

[0011] In washed cashmere fabrics, chemical fibers are used to enhance structural support. Their high strength improves the fabric's tear resistance, wrinkle resistance, and abrasion resistance, compensating for the mechanical shortcomings of natural cashmere and wool fibers. Simultaneously, 2-5% acrylate copolymers are grafted onto the surface of the chemical fibers. The polar groups of the acrylate copolymers form intermolecular forces with the keratin on the surface of the natural fibers, strengthening the interfiber bonding, preventing fabric delamination, and preserving the fabric's processing and cutting characteristics. Chemical fibers are chosen as the warp yarns because they need to withstand higher tension and friction during weaving. The high-density arrangement of the warp yarns evenly disperses the shrinkage stress of the weft yarns, ensuring dimensional stability of the fabric. The weft yarns retain the softness and warmth of cashmere / wool, balancing functionality and comfort. The weft yarns are placed on the outer layer of the fabric, directly contacting the skin to maximize their softness, warmth, and skin-friendly properties. The warp yarns are hidden in the inner layer, forming a mesh-like skeleton through high-density arrangement, dispersing the shrinkage stress of the natural fibers and ensuring dimensional stability of the fabric. The outer placement of the weft yarns exposes the hydrophobic resin-filled scale structure directly to the outside environment, allowing for more efficient water penetration resistance. The external placement of the weft yarn facilitates high-density weaving using rapier looms, while also reducing the problem of electrostatic adsorption of natural fibers during weaving.

[0012] Among the aforementioned technical features, the warp yarns can also be made of conductive fibers to achieve antistatic properties. After the cashmere / wool scales of the outer weft yarns are eroded, they exhibit a soft matte finish under light.

[0013] As a preferred technical solution, the hydrophobic resin is a polyurethane-polyurea copolymer containing disulfide bonds, the mass ratio of polyurethane segments to polyurea segments is (3-5):1, and the polyurea segments are introduced into a disulfide bond structure through a thiol-olefin click chemical reaction.

[0014] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: using a polyurethane-polyurea copolymer containing disulfide bonds as a hydrophobic resin, and introducing disulfide bonds into the polyurea segments through a thiol-ene click chemical reaction to form a hydrophobic resin treatment system with directional bonding ability; filling the scale erosion area of ​​cashmere and wool fibers after protease treatment to construct a stable hydrophobic resin filling structure, which enhances the bonding strength between the resin and the fiber compared with traditional resin crosslinking or nano-coating technology, while eliminating the need for overall surface coating of wool or cashmere, thus preserving its soft texture.

[0015] As a preferred technical solution, the acrylate copolymer includes one of butyl acrylate-acrylic acid copolymer, 2-ethylhexyl acrylate-methyl methacrylate copolymer, acrylic acid-acrylamide copolymer, and acrylic acid-styrene copolymer.

[0016] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: the presence of hydrophilic groups in the acrylate copolymer, which are introduced onto the surface of the chemical fiber through a grafting reaction, improves the wettability of the chemical fiber surface, making it easier to combine with wool / cashmere fibers, enhancing the overall harmony and hand feel of the blended fabric, increasing the structural stability of the fabric, and reducing problems such as pilling and deformation caused by fiber slippage or separation. Simultaneously, the grafted side chains improve the original feel of the chemical fiber, making the overall hand feel of the blended fabric closer to that of natural fibers, thus improving the wearing experience.

[0017] It is necessary to explain that the reason why wool and cashmere need hydrophobic resin treatment is to overcome their natural structural defects and achieve the high performance requirements of being washable, anti-pilling, and maintaining hand feel; while the reason why chemical fibers are treated with hydrophilic grafted side chains is to make up for the problems of poor comfort, weak bonding and difficulty in dyeing caused by their natural hydrophobicity, thereby achieving complementary performance of blended fabrics.

[0018] As a preferred technical solution, the protease treatment temperature is 40-50℃, the pH value is 7.5-8.5, and the treatment time is 120-150 minutes.

[0019] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: the formation of micropores and active sites on the fiber surface after moderate abrasion, which is conducive to the capillary penetration and chemical bonding of hydrophobic resin; the mild enzyme treatment conditions avoid the damage of high temperature and strong acid and alkali to the cortex of wool and cashmere fibers, retain the original strength and flexibility of the fibers, and prevent defects such as breakage and embrittlement caused by over-treatment.

[0020] As a preferred technical solution, the technical solution provided by the present invention may also have the following technical features: the protease includes one of subtilisin, papain, trypsin, and alkaline serine.

[0021] As a preferred technical solution, the preparation method of the hydrophobic resin-filled structure includes impregnating wool fibers or cashmere fibers with hydrophobic resin and then subjecting the whole structure to heat curing. The heat curing temperature is 160-180℃ and the heat curing time is 30-45 seconds.

[0022] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: high-temperature short-time thermosetting accelerates the cross-linking reaction of hydrophobic resin, enabling the resin to cure rapidly and stably adhere to the fiber surface; under high-temperature conditions, the activity of resin molecular chain segments is enhanced, promoting their binding with active sites on the fiber surface. The thermosetting temperature range is within the thermal stability range of wool / cashmere fibers, and the time is controlled within 30-45 seconds to avoid damage to the fiber structure caused by prolonged high temperatures. During the thermosetting process, the resin undergoes thermal migration and rearrangement on the fiber surface, forming a more uniform hydrophobic layer and microphase separation structure.

[0023] As a preferred technical solution, the hydrophobic resin comprises 75-90 parts of emulsion solvent, 5-10 parts of resin body, and 2-5 parts of surfactant.

[0024] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: the emulsion solvent has good wettability, which helps the resin to quickly penetrate and adhere to the fiber surface; the surfactant reduces surface tension and improves the bonding efficiency between the resin and the fiber. The emulsion solvent is mainly used to dilute the resin and form a stable aqueous emulsion system. Optional components of the emulsion system include 80-85 parts deionized water and 5-10 parts isopropanol or propylene glycol; the surfactant is used to reduce the surface tension of the emulsion and promote the uniform distribution of the resin and its adhesion to the fiber surface. Optional surfactants include nonionic surfactants such as long-chain fatty alcohols, alkylphenols, and fatty acids. In the emulsion system, wool and cashmere fibers rely on the surfactant to directionally bind with the hydrophobic resin, reducing the amount of hydrophobic resin used.

[0025] As a preferred technical solution, after heat curing, the wool or cashmere fibers are placed in a vacuum drying oven for drying, with the drying temperature controlled at 40-60 degrees Celsius and the vacuum degree at 10. -1 -10 -2 Dry at kPa for 15-30 minutes.

[0026] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: vacuum drying can accelerate the removal of residual solvents, moisture and unreacted monomers from the resin, further promoting resin cross-linking and curing; the vacuum environment lowers the boiling point of water, enabling efficient drying at lower temperatures and avoiding thermal damage to keratin fibers from high temperatures.

[0027] As a preferred technical solution, after drying, the surface of wool or cashmere fibers is purged with gas to remove loose particles and uncured hydrophobic resin. The gas flow rate is 5-10 m / s, and the purging time is 5-10 minutes.

[0028] Compared with existing technologies, the technical effects achieved by the above-mentioned technical features include: removing loose substances such as uncured resin, emulsion residue, and low-molecular-weight byproducts adhering to the fiber surface by high-speed airflow purging; selectively removing unreacted resin particles during the purging process while retaining the resin layer that is firmly bonded to the fiber, removing excess resin accumulation on the surface, and avoiding unpleasant hand feel caused by excessive resin; and a clean fiber surface is more conducive to the smooth progress of subsequent spinning, weaving, dyeing and finishing processes.

[0029] As a preferred technical solution, chemical fibers include polyester and / or nylon.

[0030] The advantages and beneficial effects of this invention are as follows: by controlling the protease treatment, the scale erosion rate of wool / cashmere fibers is precisely controlled at 30-50%, retaining some scales to maintain fiber strength, exposing the disulfide bond network at the scale seam, and improving surface bonding activity; by utilizing the chemical matching between disulfide bonds and fiber keratin to achieve directional adhesion, a hydrophobic filling structure with microphase separation is formed at the seam, so that the water contact angle of the fabric reaches 90°-120°, significantly reducing the probability of scale swelling and embedding during washing, and preventing felting deformation from the root.

[0031] In addition, the disulfide bond structure further endows the resin with excellent UV and oxidation resistance, ensuring that the hydrophobicity remains stable after multiple washes, reducing inter-fiber friction, and significantly improving the softness and pilling resistance of the fabric. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] The specific embodiments of the present invention will be further described below with reference to examples. These examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below.

[0035]

Example 1

[0036] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 40Nm and the weft yarn is 50Nm, and the yarn is woven into fabric on a rapier loom.

[0037]

Example 2

[0038] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 30Nm and the weft yarn is 60Nm, and the yarn is woven into fabric on a rapier loom.

[0039]

Example 3

[0040] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 50Nm and the weft yarn is 40Nm, and the yarn is woven into fabric on a rapier loom.

[0041]

Example 4

[0042] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 45Nm and the weft yarn is 55Nm, and the yarn is woven into fabric on a rapier loom.

[0043]

Example 5

[0044] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 35Nm and the weft yarn is 45Nm, and the yarn is woven into fabric on a rapier loom.

[0045]

Example 6

[0046] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 50Nm and the weft yarn is 50Nm, and the fabric is woven on a rapier loom.

[0047]

Example 7

[0048] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 30Nm and the weft yarn is 55Nm, and the yarn is woven into fabric on a rapier loom.

[0049]

Example 8

[0050] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 40Nm and the weft yarn is 60Nm, and the yarn is woven into fabric on a rapier loom.

[0051] Comparative Example 1 A washed cashmere fabric, by weight percentage, comprises 70% cashmere fiber and 30% wool fiber. The cashmere and wool fibers are sequentially treated with protease and then with a hydrophobic resin. The protease treatment uses papain, and is performed in a reaction vessel at 45°C and pH=8.0 for 135 minutes, resulting in a 40% scale erosion rate and a water contact angle of 90° on the surface of the wool and cashmere. The hydrophobic resin treatment uses a polyurethane-polyurea copolymer (PU / PUA mass ratio 4:1) containing disulfide bonds. Disulfide bonds are introduced through a thiol-olefin click reaction. The cashmere and wool fibers are then immersed in a treatment solution comprising 85 parts emulsion solvent (80 parts deionized water, 5 parts isopropanol), 8 parts resin (polyurethane-polyurea copolymer), and 3 parts surfactant. After removing the wool and cashmere fibers from the treatment solution, they are heated to 170°C for heat curing for 40 seconds. After heat curing, the entire fabric is transferred to a vacuum drying oven at 50°C for 10 seconds. -1 Dry under a vacuum of kPa for 20 minutes; after drying, purge both fibers with gas at a flow rate of 8 m / s for 8 minutes.

[0052] Cashmere and wool are spun into yarn, which is used as both weft and warp yarn. The warp yarn is 40 Nm and the weft yarn is 50 Nm, and the yarn is woven into fabric on a rapier loom.

[0053] Comparative Example 2 A washed cashmere fabric, by weight percentage, comprises 60% cashmere fiber, 25% wool fiber, and 15% chemical fiber (polyester). The cashmere and wool fibers are sequentially treated with protease and then with hydrophobic resin. The protease treatment uses papain, and is performed in a reaction vessel at 45°C and pH=8.0 for 135 minutes, resulting in a 40% scale erosion rate and a water contact angle of 90° on the surface of the wool and cashmere. The hydrophobic resin treatment uses a polyurethane-polyurea copolymer (PU / PUA mass ratio 4:1) containing disulfide bonds. After introducing disulfide bonds through a thiol-olefin click reaction, the cashmere and wool fibers are immersed in the treatment solution, which includes 85 parts of emulsion solvent (80 parts of deionized water and 5 parts of isopropanol), 8 parts of resin (polyurethane-polyurea copolymer), and 3 parts of surfactant. After removing the wool and cashmere fibers from the treatment solution, they are heated to 170°C for heat curing for 40 seconds. After heat curing, the entire fabric is transferred to a vacuum drying oven and dried at 50°C for 10 seconds. -1 Dry under a vacuum of kPa for 20 minutes; after drying, purge both fibers with gas at a flow rate of 8 m / s for 8 minutes.

[0054] The chemical fibers were not surface grafted. After cashmere and wool were spun into yarn, which was used as weft yarn, the chemical fibers were used as warp yarn. The warp yarn was 40Nm and the weft yarn was 50Nm, and the fabric was woven on a rapier loom.

[0055] Comparative Example 3 A washed cashmere fabric, by weight percentage, comprises 100% cashmere fibers. The cashmere fibers are sequentially treated with protease and then with hydrophobic resin. The protease treatment uses papain, and is performed in a reaction vessel at 45°C and pH=8.0 for 135 minutes, resulting in a 40% scale erosion rate and a water contact angle of 90° on the cashmere surface. The hydrophobic resin treatment uses a polyurethane-polyurea copolymer (PU / PUA mass ratio 4:1) containing disulfide bonds. Disulfide bonds are introduced through a thiol-olefin click reaction. The cashmere fibers are then immersed in a treatment solution comprising 85 parts emulsion solvent (80 parts deionized water, 5 parts isopropanol), 8 parts resin (polyurethane-polyurea copolymer), and 3 parts surfactant. After the cashmere fibers are removed from the treatment solution, they are heated to 170°C for heat curing for 40 seconds. After heat curing, the entire fabric is transferred to a vacuum drying oven and dried at 50°C for 10 seconds. -1 Dry under a vacuum of kPa for 20 minutes; after drying, purge the fiber with gas at a flow rate of 8 m / s for 8 minutes.

[0056] After cashmere is spun into yarn, it is used as both weft and warp yarn. The warp yarn is 40 Nm and the weft yarn is 50 Nm, and the yarn is woven into fabric on a rapier loom.

[0057] Comparative Example 4 A washed cashmere fabric, by weight percentage, comprises 60% cashmere fiber, 25% wool fiber, and 15% chemical fiber (polyester). The cashmere and wool fibers are sequentially treated with protease and then with hydrophobic resin. The protease treatment uses papain, and is performed in a reaction vessel at 45°C and pH=8.0 for 135 minutes, resulting in a 40% scale erosion rate and a water contact angle of 90° on the surface of the wool and cashmere. The hydrophobic resin treatment uses a disulfide-free polyurethane resin. The cashmere and wool fibers are immersed in a treatment solution comprising 85 parts emulsion solvent (80 parts deionized water, 5 parts isopropanol), 8 parts resin bulk, and 3 parts surfactant. After the wool and cashmere fibers are removed from the treatment solution, they are heated to 170°C for heat curing for 40 seconds. After heat curing, the entire fabric is transferred to a vacuum drying oven at 50°C for 10 seconds. -1 Dry under a vacuum of kPa for 20 minutes; after drying, purge both fibers with gas at a flow rate of 8 m / s for 8 minutes.

[0058] The surface of the chemical fiber is grafted with butyl acrylate-acrylic acid copolymer, and the grafting rate is 3.5%.

[0059] Cashmere and wool are spun into yarn, which is used as weft yarn, and chemical fibers are used as warp yarn. The warp yarn is 40Nm and the weft yarn is 50Nm, and the yarn is woven into fabric on a rapier loom.

[0060] Performance tests were conducted on the above embodiments and comparative examples, and the test results are shown in the table below. The wash resistance test was performed according to GB / T 8629-2017 "Determination of Dimensional Changes After Washing and Drying of Textiles". The fabric samples were subjected to standard washing (40℃ water temperature, neutral detergent, drum washing machine). Dimensional changes were measured after each wash and recorded until significant felting or pilling occurred. The pilling resistance test was performed according to GB / T 4802.1-2008 "Test Method for Pilling of Fabrics Part 1: Martindale Method". After 1000 cycles of rubbing on a Martindale pilling tester, the samples were rated (1-5 levels) against a standard sample card. Dimensional change was measured according to GB / T8628-2001 "Determination of Dimensional Changes After Washing of Textiles". The warp and weft lengths of the samples were measured before and after washing, and the dimensional change rate was calculated. The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A washed cashmere fabric, characterized in that, By weight percentage, the fabric comprises 50-75% cashmere fiber, 15-30% wool fiber, and 10-20% chemical fiber. The cashmere fiber and wool fiber are treated with protease and hydrophobic resin, the hydrophobic resin containing disulfide bonds. The hydrophobic resin treatment causes the scales of the wool fiber and cashmere fiber to erode, with the erode rate controlled at 30-50%. A hydrophobic resin filling structure is formed at the scale seams. The water contact angle of the fabric is 90°-120°. The surface of the chemical fiber is grafted with an acrylate copolymer with a grafting rate of 2-5%. The wool fiber and cashmere fiber are spun into weft yarns, and the chemical fiber is used as warp yarns. The weft yarn count is 40-60 Nm, and the warp yarn count is 30-50 Nm. The weft and warp yarns are interwoven to form the fabric.

2. The washed cashmere fabric according to claim 1, characterized in that, The hydrophobic resin is a polyurethane-polyurea copolymer containing disulfide bonds, wherein the mass ratio of the polyurethane segment to the polyurea segment is (3-5):1, and the polyurea segment is introduced into a disulfide bond structure through a thiol-olefin click chemistry reaction.

3. The washed cashmere fabric according to claim 2, characterized in that, The acrylate copolymer includes one of butyl acrylate-acrylic acid copolymer, 2-ethylhexyl acrylate-methyl methacrylate copolymer, acrylic acid-acrylamide copolymer, and acrylic acid-styrene copolymer.

4. The washed cashmere fabric according to claim 2, characterized in that, The protease treatment temperature is 40-50℃, the pH value is 7.5-8.5, and the treatment time is 120-150 minutes.

5. The washed cashmere fabric according to claim 4, characterized in that, The protease includes one of subtilisin, papain, trypsin, and basic serine.

6. The washed cashmere fabric according to claim 1, characterized in that, The method for preparing the hydrophobic resin-filled structure includes impregnating wool fibers or cashmere fibers with hydrophobic resin and then subjecting the entire structure to heat curing at a temperature of 160-180°C for 30-45 seconds.

7. The washed cashmere fabric according to claim 6, characterized in that, The hydrophobic resin comprises 75-90 parts of emulsion solvent, 5-10 parts of resin body, and 2-5 parts of surfactant.

8. The washed cashmere fabric according to claim 7, characterized in that, After heat curing, place the wool or cashmere fibers in a vacuum drying oven for drying. The drying temperature is controlled at 40-60 degrees Celsius, and the vacuum degree is 10. -1 -10 -2 Dry at kPa for 15-30 minutes.

9. The washed cashmere fabric according to claim 8, characterized in that, After drying, the surface of wool or cashmere fibers is purged with gas to remove loose particles and uncured hydrophobic resin. The gas flow rate is 5-10 m / s and the purging time is 5-10 minutes.

10. The washed cashmere fabric according to any one of claims 1-9, characterized in that, The chemical fibers include polyester and / or nylon.

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