Preparation method of fabric based on high-count super-soft fluff water-soluble yarn

Abstract

The invention belongs to the technical field of fiber materials, and particularly relates to a preparation method of a fabric based on high-count super-soft fluff water-soluble yarn. The preparation method comprises the following steps: S1, pretreating 70-80 parts of plush fibers, and then mixing the pretreated plush fibers with 20-30 parts of polyvinyl alcohol fibers to obtain mixed fibers; s2, the mixed fibers are sequentially subjected to spinning procedures of blending, carding, needle number, combing, first needle, second needle, third needle, fourth needle, roving, spinning, spooling, doubling and two-for-one twisting, high-count yarn is obtained, the high-count yarn is woven into fabric, then water dissolving treatment is conducted, and the light, thin and super-soft fabric is obtained; the characteristic that the polyvinyl alcohol fibers are dissolved under specific conditions is utilized, so that the fluffy and breathable structures are formed by the plush fibers in the yarn, and the softness, the heat retention property and the breathability are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber materials, and particularly relates to a method for preparing a fabric based on high-count super-soft fluffy water-soluble yarn. Background Art

[0002] With increasing consumer demand for comfort, functionality, and wearability, the production of high-end worsted, fine-count, ultra-fine plush yarn has become a trend, particularly for the production of lightweight fabrics. Currently, mass production of fine-count worsted plush yarn generally falls below 80s, and mass production of yarns around 100s is difficult, primarily due to the inherent characteristics of the plush fiber. To produce fine plush yarns around 100s, improve the spinnability of the yarn, ensure sufficient strength, and meet the tension generated during weaving to increase weaving efficiency, PVA (soluble polyvinyl alcohol) fiber raw material is added during spinning to improve the fiber's spinnability and yarn strength.

[0003] A Chinese patent (publication number CN116770489A) discloses a method for preparing a blended fabric of animal hair fiber and polyester fiber. The invention comprises the following steps: co-spinning PVA fiber and animal hair fiber to obtain a first single yarn; co-spinning PVA fiber and polyester fiber to obtain a second single yarn; blending the first single yarn and the second single yarn to obtain a blended yarn; weaving the blended yarn to obtain a blended fabric of animal hair fiber and polyester fiber; placing the blended fabric of animal hair fiber and polyester fiber in a de-fibering solution for de-fibering treatment, wherein the de-fibering solution includes hydrogen peroxide, tetraacetylethylenediamine and silica; and then rinsing and drying to obtain a blended fabric of animal hair fiber and polyester fiber.

[0004] However, further research is still needed to learn how to spin polyvinyl alcohol water-soluble fibers and plush fibers into yarns, weave the yarns into fabrics, and remove the water-soluble fibers through a subsequent water-soluble treatment process, so that the plush fibers in the fabrics form a fluffy and breathable structure and effectively improve the softness, warmth retention and breathability. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method of fabrics based on high-count ultra-soft plush water-soluble yarns, in which plush fibers are combined with polyvinyl alcohol fibers through a spinning process, and are spun into high-count yarns with high strength and good evenness through a worsted spinning process, thereby ensuring that the weaving process meets the high-quality requirements for strength and uniform evenness, and then utilizing the property of polyvinyl alcohol fibers that dissolve under specific conditions to form a fluffy and breathable structure in the plush fibers of the yarn, thereby effectively improving the softness, warmth retention and breathability of the yarn.

[0006] The first aspect of the present invention provides a method for preparing a fabric based on high-count super-soft water-soluble yarn, comprising the following steps: S1: pre-treating 70-80 parts of plush fibers and then mixing them with 20-30 parts of polyvinyl alcohol fibers to obtain mixed fibers; S2: The mixed fiber is subjected to the spinning processes of mixing, combing, needle counting, combing, first needle, second needle, third needle, fourth needle, roving, spun yarn, winding, paralleling and doubling in sequence to obtain high-count yarn. The high-count yarn is woven into fabric and then subjected to water-soluble treatment to obtain light and ultra-soft fabric.

[0007] As a preferred technical solution of the present invention, the length of the plush fiber is 50-55 mm, and the fineness is 17.0-18.5 μm.

[0008] By properly screening the length and fineness of the plush fibers, it is beneficial to improve the yarn quality and give the yarn softness, fineness and warmth retention properties.

[0009] As a preferred technical solution of the present invention, the pretreatment step includes: mixing 4 to 6 parts of antistatic agent, 0.6 to 0.8 parts of crude oil, and 8 to 10 parts of water in parts by weight, and then spraying it on the plush fiber for 20 to 24 hours.

[0010] As a preferred technical solution of the present invention, the polyvinyl alcohol fiber is Kuraray polyvinyl alcohol fiber K-II 40 and regenerated polyvinyl alcohol fiber; the polyvinyl alcohol fiber is polyvinyl alcohol fiber K-II 40 and regenerated polyvinyl alcohol fiber in a mass ratio of (1~2):1.

[0011] As a preferred technical solution of the present invention, the Kuraray polyvinyl alcohol fiber K-II 40 has a dissolving temperature of 40°C, a length of 51 mm, and a fineness of 1.25D.

[0012] As a preferred technical solution of the present invention, the preparation method of the regenerated polyvinyl alcohol fiber includes: first using anhydrous sodium sulfate, sodium polyphosphate and boric acid to recycle polyvinyl alcohol printing and dyeing wastewater to obtain recycled polyvinyl alcohol powder; using choline chloride and xylitol to modify the recovered polyvinyl alcohol powder to obtain modified polyvinyl alcohol; and melt-spinning the modified polyvinyl alcohol to obtain regenerated polyvinyl alcohol fiber.

[0013] As a preferred technical solution of the present invention, the recycling treatment step includes: adding 4.6 to 4.8 parts of anhydrous sodium sulfate to 280 to 300 parts of polyvinyl alcohol printing and dyeing wastewater, stirring for 6 to 10 minutes, then adding 4.2 to 4.4 parts of sodium polyphosphate, reacting at 40 to 50° C. for 10 to 16 minutes, and finally adding 4.4 to 4.6 parts of boric acid, stirring at 50 to 60° C. for 4 to 8 minutes, washing the product with water, drying, and crushing to obtain recovered polyvinyl alcohol.

[0014] The recovered polyvinyl alcohol powder of the present invention uses anhydrous sodium sulfate, sodium polyphosphate and boric acid to recycle polyvinyl alcohol printing and dyeing wastewater. The salt ions of the anhydrous sodium sulfate have strong hydration ability and can absorb a large number of water molecules around themselves by virtue of their own polarity, thereby causing the polyvinyl alcohol to be dehydrated and precipitated. Sodium polyphosphate is an inorganic polyphosphate, which is composed of orthophosphate linear polymers connected by high-energy phosphoric anhydride bonds, is soluble in water, and reacts with hydroxyl groups to cause rapid sedimentation and precipitation. The trivalent boron atom of the boric acid has an empty p orbital and has strong electrophilicity, and can quickly complex with the 1,3-dihydroxy structure in the polyvinyl alcohol molecular chain, thereby improving the recovery rate of the polyvinyl alcohol.

[0015] As a preferred technical solution of the present invention, the modification treatment step includes: reacting 8 to 10 parts of choline chloride and 8 to 10 parts of xylitol at 80 to 90° C. for 100 to 120 minutes to obtain an ionic liquid, adding 30 to 40 parts of water and stirring for 30 to 40 minutes, then adding 100 to 120 parts of recovered polyvinyl alcohol and swelling them in a vacuum at 60 to 70° C. for 4 to 6 hours, drying, adding 2 to 4 parts of calcium stearate, and then extruding and pelletizing them through a screw extruder to obtain modified polyvinyl alcohol.

[0016] The regenerated polyvinyl alcohol fiber of the present invention is obtained by modifying recycled polyvinyl alcohol powder with choline chloride and xylitol. The ionic liquid formed by choline chloride and xylitol can form new hydrogen bonds with the polyvinyl alcohol, breaking the original hydrogen bonding of the polyvinyl alcohol itself. On the other hand, the ionic liquid with a small molecular structure is surrounded by the polyvinyl alcohol molecular chains, disrupting the original regular arrangement of the polyvinyl alcohol molecular chains and increasing the distance between the molecular chains, thereby making the regenerated polyvinyl alcohol fiber quickly water-soluble.

[0017] As a preferred technical solution of the present invention, the melt spinning conditions include: a spinning temperature of 200~220°C, a screw speed of 50~60r / min, a spinning machine metering pump frequency of 10~20Hz, a spinning speed of 400~500m / min, and a cooling temperature of 20~24°C.

[0018] As a preferred technical solution of the present invention, in the combing process, the sliver basis weight is 3.6 g / m, the cylinder speed is 260 rpm, and the sliver delivery speed is 35 m / min.

[0019] As a preferred technical solution of the present invention, the number of needles fed and combined in the needle number process is 4 to 6, the basis weight is 2.8 g / m, the drafting multiple is 6 to 8 times, and the sliver output speed is 45 m / min.

[0020] As a preferred technical solution of the present invention, the sliver weight in the combing process is 4.2 g / m and the sliver delivery speed is 40 m / min.

[0021] As a preferred technical solution of the present invention, in the roving process, the drafting ratio is 8 to 10 times, the twist is 40 to 50 twists / meter, the basis weight is 3.0 to 3.2 grams / 10 meters, and the spindle speed is 500 to 600 revolutions / minute; In the spinning process, the drafting ratio is 20-22 times, the twist is 800-900 twists / m, and the spindle speed is 8000-9000 rpm.

[0022] The process of the present invention is more suitable for plush blended high-count yarn of about 100 NM, and can improve its spinnability, so that the yarn has sufficient strength and yarn uniformity to meet the tension requirements during weaving.

[0023] As a preferred technical solution of the present invention, the conditions for the water-soluble treatment include: pH 6.5~7.5, the first water-soluble temperature is 40°C, the first water-soluble time is 20~30min; the second water-soluble temperature is 70~80°C, and the second water-soluble time is 60~80s.

[0024] The present invention controls the first water dissolution temperature and time to remove Kuraray polyvinyl alcohol fiber K-II 40 and form a primary pore structure, and controls the second water dissolution temperature and time to remove regenerated polyvinyl alcohol fiber to form a secondary pore structure, thereby forming a two-level pore structure in the water-soluble yarn and improving the yarn performance.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention combines plush fibers with polyvinyl alcohol fibers through a spinning process, and spins them into high-count yarns with high strength and good evenness through a worsted spinning process, ensuring that the high-quality requirements for strength and evenness are met during the weaving process. Utilizing the property of polyvinyl alcohol fibers that dissolve under specific conditions, the polyvinyl alcohol fibers are dissolved in water, and the weight per unit volume of the fabric is greatly reduced, effectively enhancing the softness and warmth retention properties, and improving the lightness and comfort. (2) The present invention is compounded by Kuraray polyvinyl alcohol fiber K-II 40 and regenerated polyvinyl alcohol fiber, wherein Kuraray polyvinyl alcohol fiber K-II 40 can slowly dissolve at a low temperature of about 40°C to form a primary pore structure, and the regenerated polyvinyl alcohol fiber can quickly dissolve at 70-80°C to form a secondary pore structure. The polyvinyl alcohol fiber K-II 40 reacts slowly at low temperature to form uniform and fine pores, and the regenerated polyvinyl alcohol fiber reacts quickly at high temperature to form large-sized irregular pores. The two-level pore structure improves the air permeability, softness and thermal insulation performance of the water-soluble yarn; (3) The process of the present invention is more suitable for plush blended high-count yarn of about 100 NM, and can improve its spinnability, so that the yarn has sufficient strength and yarn uniformity to meet the tension requirements during weaving. DETAILED DESCRIPTION

[0026] For the convenience of understanding the present invention, the present invention is given below with examples. It should be understood by those skilled in the art that the examples are only for the purpose of helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0027] The sources of some components in the Examples and Comparative Examples are as follows: Polyvinyl alcohol fiber K-II 40 was purchased from Kuraray, Japan; Anhydrous sodium sulfate, CAS15124-09-1, was purchased from Sinopharm Chemical Reagent Co., Ltd. Sodium polyphosphate, CAS 68915-31-1, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; Boric acid, CAS10043-35-3, was purchased from Sinopharm Chemical Reagent Co., Ltd.; Choline chloride, CAS67-48-1, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; Xylitol, CAS 87-99-0, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.

[0028] Example 1. This embodiment provides a method for preparing a fabric based on high-count ultra-soft water-soluble yarn, comprising the following steps: S1: 70 parts of plush fibers (55 mm in length and 18.5 μm in fineness) were pretreated by spraying 6 parts of an antistatic agent, 0.8 parts of a wool oil, and 10 parts of water on the plush fibers for 24 hours. The fibers were then mixed with 30 parts of polyvinyl alcohol fibers (20 parts of Kuraray polyvinyl alcohol fiber K-II 40 and 10 parts of recycled polyvinyl alcohol fibers) to obtain a mixed fiber. S2: The mixed fiber is processed in sequence: wool and combing (sliver weight is 3.6 g / m, cylinder speed is 260 rpm, sliver delivery speed is 35 m / min), needle number (feeding and combining number is 6, weight is 2.8 g / m, drafting ratio is 6-8 times, sliver delivery speed is 45 m / min), combing (sliver weight is 4.2 g / m, sliver delivery speed is 40 m / min), first needle, second needle, third needle, fourth needle, roving (drafting ratio is 10 times, twist is 50 twists / m), The high-count yarn is obtained through the spinning processes of quantitative 3.2 g / 10 m, spindle speed 600 rpm), spun yarn (drafting multiple 22 times, twist 900 twists / m, spindle speed 9000 rpm), winding, doubling and doubling. After the high-count yarn is woven into fabric, it is water-soluble treated (pH 7.5, first water-soluble temperature 40°C, first water-soluble time 30 min; second water-soluble temperature 80°C, second water-soluble time 60 s) to obtain a light and ultra-soft fabric.

[0029] The Kuraray polyvinyl alcohol fiber K-II 40 has a dissolving temperature of 40° C., a length of 51 mm, and a fineness of 1.25D.

[0030] The preparation of the regenerated polyvinyl alcohol fiber comprises the following steps: adding 4.8 parts of anhydrous sodium sulfate to 300 parts of polyvinyl alcohol printing and dyeing wastewater, stirring for 10 minutes, then adding 4.4 parts of sodium polyphosphate, reacting at 50° C. for 10 minutes, and finally adding 4.6 parts of boric acid, stirring at 60° C. for 4 minutes, washing the product with water, drying, and crushing to obtain recycled polyvinyl alcohol; reacting 10 parts of choline chloride and 10 parts of xylitol at 90° C. for 100 minutes to obtain a quasi-ionic liquid, adding 40 parts of water, stirring for 40 minutes, then adding 120 parts of recycled polyvinyl alcohol, vacuum swelling at 70° C. for 4 hours, drying, adding 4 parts of calcium stearate, and then extruding and pelletizing the product through a screw extruder to obtain modified polyvinyl alcohol; and melt-spinning the modified polyvinyl alcohol, controlling the spinning temperature at 220° C., the screw speed at 60 r / min, the spinning machine metering pump frequency at 20 Hz, the spinning speed at 500 m / min, and the cooling temperature at 24° C. to obtain the regenerated polyvinyl alcohol fiber.

[0031] Example 2: This embodiment provides a method for preparing a fabric based on high-count ultra-soft water-soluble yarn, comprising the following steps: S1: 80 parts of plush fibers (50 mm in length and 17.0 μm in fineness) were pretreated by evenly mixing 4 parts of an antistatic agent, 0.6 parts of a wool oil, and 8 parts of water. The mixture was then sprayed on the plush fibers for 20 hours and then mixed with 20 parts of polyvinyl alcohol fibers (10 parts of Kuraray polyvinyl alcohol fiber K-II 40 and 10 parts of recycled polyvinyl alcohol fiber) to obtain a mixed fiber. S2: The mixed fiber is processed in sequence: wool and combing (raw sliver weight is 3.6 g / m, cylinder speed is 260 rpm, and sliver delivery speed is 35 m / min), needle number (feeding and combining number is 4, weight is 2.8 g / m, drafting multiple is 6 times, and sliver delivery speed is 45 m / min), combing (sliver weight is 4.2 g / m, and sliver delivery speed is 40 m / min), first needle, second needle, third needle, fourth needle, roving (drafting multiple is 8 times, twist is 40 twists / m, and fixed number is 10 times). The high-count yarn is obtained through the spinning processes of yarn drawing (drafting multiple is 20 times, twist is 800 twists / m, spindle speed is 8000 rpm), winding, doubling and doubling. After the high-count yarn is woven into fabric, it is water-soluble treated (pH is 6.5, the first water-soluble temperature is 40℃, the first water-soluble time is 20min; the second water-soluble temperature is 70℃, the second water-soluble time is 80s) to obtain a light and ultra-soft fabric.

[0032] The Kuraray polyvinyl alcohol fiber K-II 40 has a dissolving temperature of 40° C., a length of 51 mm, and a fineness of 1.25D.

[0033] The preparation of the regenerated polyvinyl alcohol fiber comprises the following steps: adding 4.6 parts of anhydrous sodium sulfate to 280 parts of polyvinyl alcohol printing and dyeing wastewater, stirring for 6 minutes, then adding 4.2 parts of sodium polyphosphate, reacting at 40°C for 16 minutes, and finally adding 4.4 parts of boric acid, stirring at 50°C for 8 minutes, washing the product with water, drying, and crushing to obtain recycled polyvinyl alcohol; reacting 8 parts of choline chloride and 8 parts of xylitol at 80°C for 120 minutes to obtain a quasi-ionic liquid, adding 30 parts of water, stirring for 30 minutes, then adding 100 parts of recycled polyvinyl alcohol, vacuum swelling at 60°C for 6 hours, drying, adding 2 parts of calcium stearate, and then extruding and pelletizing the product through a screw extruder to obtain modified polyvinyl alcohol; and melt-spinning the modified polyvinyl alcohol, controlling the spinning temperature at 200°C, the screw speed at 50 r / min, the spinning machine metering pump frequency at 10 Hz, the spinning speed at 400 m / min, and the cooling temperature at 20°C to obtain the regenerated polyvinyl alcohol fiber.

[0034] Example 3: This embodiment provides a method for preparing a fabric based on high-count super-soft water-soluble yarn, comprising the following steps: S1: 75 parts of plush fibers (52 mm in length and 18.0 μm in fineness) were pretreated by spraying 5 parts of an antistatic agent, 0.7 parts of a wool oil, and 9 parts of water on the plush fibers for 22 hours. The fibers were then mixed with 25 parts of polyvinyl alcohol fibers (15 parts of Kuraray polyvinyl alcohol fiber K-II 40 and 10 parts of recycled polyvinyl alcohol fiber) to obtain a mixed fiber. S2: The mixed fiber is processed in sequence: wool and carding (raw sliver is 3.6 g / m, cylinder speed is 260 rpm, and sliver delivery speed is 35 m / min), needle number (feeding and combining number is 5, weight is 2.8 g / m, drafting multiple is 7 times, and sliver delivery speed is 45 m / min), combing (sliver weight is 4.2 g / m, and sliver delivery speed is 40 m / min), first needle, second needle, third needle, fourth needle, roving (drafting multiple is 9 times, twist is 45 twists / m, and fixed number) The high-count yarn is obtained through the spinning processes of yarn drawing (drafting multiple is 21 times, twist is 850 twists / m, spindle speed is 8500 rpm), winding, doubling and doubling. After the high-count yarn is woven into fabric, it is water-soluble treated (pH is 7.0, the first water-soluble temperature is 40℃, the first water-soluble time is 25min; the second water-soluble temperature is 75℃, the second water-soluble time is 70s) to obtain a light and ultra-soft fabric.

[0035] The Kuraray polyvinyl alcohol fiber K-II 40 has a dissolving temperature of 40° C., a length of 51 mm, and a fineness of 1.25D.

[0036] The preparation of the regenerated polyvinyl alcohol fiber comprises the following steps: adding 4.7 parts of anhydrous sodium sulfate to 290 parts of polyvinyl alcohol printing and dyeing wastewater by weight, stirring for 8 minutes, then adding 4.3 parts of sodium polyphosphate, reacting at 45° C. for 12 minutes, and finally adding 4.5 parts of boric acid, stirring at 55° C. for 6 minutes, washing the product with water, drying, and crushing to obtain recycled polyvinyl alcohol; reacting 9 parts of choline chloride and 9 parts of xylitol at 85° C. for 110 minutes to obtain a quasi-ionic liquid, adding 35 parts of water, stirring for 35 minutes, then adding 110 parts of recycled polyvinyl alcohol, vacuum swelling at 65° C. for 5 hours, drying, adding 3 parts of calcium stearate, and then extruding and pelletizing through a screw extruder to obtain modified polyvinyl alcohol; and melt-spinning the modified polyvinyl alcohol, controlling the spinning temperature at 210° C., the screw speed at 55 r / min, the spinning machine metering pump frequency at 15 Hz, the spinning speed at 450 m / min, and the cooling temperature at 22° C. to obtain the regenerated polyvinyl alcohol fiber.

[0037] Comparative Example 1 The difference between this comparative example and Example 1 is that 30 parts of recycled polyvinyl alcohol fibers are used instead of polyvinyl alcohol fibers.

[0038] Comparative Example 2 The difference between this comparative example and Example 1 is that 30 parts of Kuraray polyvinyl alcohol fiber K-II 40 was used as the polyvinyl alcohol fiber.

[0039] Comparative Example 3 The difference between this comparative example and Example 1 is that the second water dissolution time in the water dissolution treatment is changed to 20 seconds.

[0040] The above embodiments and comparative routine performance tests were conducted using the following test methods: (1) Air permeability test: refer to the requirements of GB / T 5453-2025 Textile fabrics - Determination of air permeability for testing; (2) Softness test: Tested using a fabric style tester, Grade IV, with Grade I being the softest; (3) Thermal insulation performance test: Test according to the requirements of GB / T 11048-2018 Textiles for physiological comfort - Determination of thermal and moisture resistance under steady-state conditions.

[0041] The above performance test data is shown in Table 1.

[0042] Table 1 Performance test results .

[0043] From the above content, it can be seen that the present invention combines plush fiber with polyvinyl alcohol fiber through a spinning process, and spins it into high-count yarn with high strength and good evenness through a worsted spinning process, ensuring the high quality requirements of strength and uniform evenness in the weaving process. Then, the dissolution property of polyvinyl alcohol fiber under specific conditions is utilized, and Kuraray polyvinyl alcohol fiber K-II 40 and regenerated polyvinyl alcohol fiber are selected for compounding, and a multi-level pore structure is formed during the dissolution process to prepare a fabric based on high-count ultra-soft plush water-soluble yarn (Examples 1 to 3), which effectively enhances softness and warmth retention, and improves lightness and comfort.

[0044] Compared with Example 1, the polyvinyl alcohol fiber used entirely as recycled polyvinyl alcohol fiber, and Kuraray polyvinyl alcohol fiber K-II 40 was not added. The primary pore structure formed after the latter was dissolved was lacking, resulting in reduced air permeability, poor softness, and poor thermal insulation (Comparative Example 1); compared with Example 1, the polyvinyl alcohol fiber used entirely as Kuraray polyvinyl alcohol fiber K-II 40, and no recycled polyvinyl alcohol fiber was added. The secondary pore structure formed after the latter was dissolved was lacking, resulting in reduced air permeability, poor softness, and poor thermal insulation (Comparative Example 2); compared with Example 1, the second water dissolution time in the water dissolution treatment was changed to 20 seconds. The second water dissolution time was insufficient, resulting in the inability to fully form a secondary pore structure, resulting in reduced air permeability, poor softness, and poor thermal insulation (Comparative Example 3).

Claims

1. A method for preparing a fabric based on high-count super-soft water-soluble yarn, characterized in that: The following steps are involved: S1: pre-treating 70-80 parts of plush fibers and then mixing them with 20-30 parts of polyvinyl alcohol fibers to obtain mixed fibers; S2: The mixed fiber is subjected to the spinning processes of mixing, combing, needle counting, combing, first needle, second needle, third needle, fourth needle, roving, spun yarn, winding, paralleling and doubling in sequence to obtain high-count yarn. The high-count yarn is woven into fabric and then subjected to water-soluble treatment to obtain light and ultra-soft fabric.

2. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 1, characterized in that: The length of the plush fiber is 50-55 mm, and the fineness is 17.0-18.5 μm.

3. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 1, characterized in that: The pretreatment step comprises: mixing 4 to 6 parts of antistatic agent, 0.6 to 0.8 parts of crude oil and 8 to 10 parts of water in parts by weight, and then spraying the mixture on the plush fibers for 20 to 24 hours.

4. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 1, characterized in that: The polyvinyl alcohol fiber is Kuraray polyvinyl alcohol fiber K-II 40 and regenerated polyvinyl alcohol fiber; the polyvinyl alcohol fiber is polyvinyl alcohol fiber K-II 40 and regenerated polyvinyl alcohol fiber in a mass ratio of (1~2):

1.

5. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 4, characterized in that: The Kuraray polyvinyl alcohol fiber K-II 40 has a dissolving temperature of 40° C., a length of 51 mm, and a fineness of 1.25D.

6. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 4, characterized in that: The preparation method of the regenerated polyvinyl alcohol fiber comprises: firstly recycling polyvinyl alcohol printing and dyeing wastewater using anhydrous sodium sulfate, sodium polyphosphate and boric acid to obtain recycled polyvinyl alcohol powder; modifying the recycled polyvinyl alcohol powder using choline chloride and xylitol to obtain modified polyvinyl alcohol; and melt-spinning the modified polyvinyl alcohol to obtain regenerated polyvinyl alcohol fiber.

7. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 6, characterized in that: The recycling treatment step comprises: adding 4.6-4.8 parts of anhydrous sodium sulfate to 280-300 parts of polyvinyl alcohol printing and dyeing wastewater by weight, stirring for 6-10 minutes, then adding 4.2-4.4 parts of sodium polyphosphate, reacting at 40-50° C. for 10-16 minutes, and finally adding 4.4-4.6 parts of boric acid, stirring at 50-60° C. for 4-8 minutes, washing the product with water, drying, and crushing to obtain recovered polyvinyl alcohol.

8. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 6, characterized in that: The modification treatment comprises the following steps: reacting 8-10 parts of choline chloride and 8-10 parts of xylitol at 80-90° C. for 100-120 minutes to obtain a quasi-ionic liquid; adding 30-40 parts of water and stirring for 30-40 minutes; adding 100-120 parts of recovered polyvinyl alcohol and swelling them in a vacuum at 60-70° C. for 4-6 hours; drying; adding 2-4 parts of calcium stearate; and extruding and pelletizing the mixture through a screw extruder to obtain modified polyvinyl alcohol.

9. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 1, characterized in that: In the combing process, the carded sliver basis weight is 3.6 g / m, the cylinder speed is 260 rpm, and the sliver delivery speed is 35 m / min; In the needle number process, the feeding and combining number is 4 to 6, the basis weight is 2.8 g / m, the drafting multiple is 6 to 8 times, and the sliver delivery speed is 45 m / min; The sliver weight in the combing process is 4.2 g / m and the sliver delivery speed is 40 m / min; In the roving process, the drafting ratio is 8-10 times, the twist is 40-50 twists / m, the basis weight is 3.0-3.2 g / 10 m, and the spindle speed is 500-600 rpm; In the spinning process, the drafting ratio is 20-22 times, the twist is 800-900 twists / m, and the spindle speed is 8000-9000 rpm.

10. The method for preparing a fabric based on high-count super-soft water-soluble yarn according to claim 1, characterized in that: The conditions of the water dissolution treatment include: pH 6.5-7.5, a first water dissolution temperature of 40° C., a first water dissolution time of 20-30 min; a second water dissolution temperature of 70-80° C., and a second water dissolution time of 60-80 s.