Preparation process of single-absorption and single-prevention fabric

Abstract

The invention relates to the field of textile fabrics, in particular to a preparation process of a single-absorption and single-prevention fabric, which mainly solves the problems of poor structural stability, poor air permeability and low moisture transfer efficiency of the single-absorption and single-prevention fabric in the prior art, and comprises the following steps: step 1, preparing materials including hydrophilic yarns, water-repellent yarns and connecting yarns; the hydrophilic yarn, the water-repellent yarn and the connecting yarn are guided into a disc knitting device to be knitted into gray fabric, and the disc knitting device comprises a first upper knitting needle, a second upper knitting needle, a first lower knitting needle and a second lower knitting needle; and step 3, after-finishing process: putting the gray fabric into a setting machine, and controlling the temperature of the setting machine at 160-180 DEG C for 30-60 seconds so as to stabilize the size of the fabric and maintain the function of the yarn.

Description

Technical Field

[0001] The invention relates to the field of textile fabrics, and in particular to a preparation process of a single-absorption and single-protection fabric. Background Art

[0002] Most of the existing single-sided moisture-conducting fabrics adopt a multi-layer composite structure, and then undergo a later finishing process to form a single-absorbent and single-proof fabric. For example, Chinese patent authorization announcement No. CN101694063B discloses a finishing method for a single-absorbent and single-proof fabric, which includes the following process steps: (1) Water absorption finishing: soak the dyed fabric in a hydrophilic finishing liquid for 5 to 15 minutes, the immersion pH value is 4.5 to 5, the immersion temperature is room temperature, and the bath ratio is 1:10 to 50; the amount of hydrophilic additive in the hydrophilic finishing liquid is 10 to 20 grams / liter, and the rest is water; the soaked fabric is rolled dry at a pressure of 3 to 7kg / cm² and a liquid carrying rate of 70 to 80%; the rolled dry fabric is dried at 130 to 160°C; (2) Waterproof Finishing: coating the front side of the fabric subjected to the water absorption finishing in step (1) with a waterproof finishing liquid on a rotary screen printing machine at a temperature of 150-170° C. for 1-2 minutes; the proportion of the components of the waterproof finishing liquid is calculated by weight: Rudolf fluorocarbon resin FC-9005: 140-160 parts; Rudolf crosslinking agent FX-8005: 9-11 parts; Rudolf thickener TH-5000: 800-850 parts; the dyed fabric is finished by dipping and rolling in the hydrophilic finishing liquid; and then coating one side of the fabric with the waterproof finishing liquid on a rotary screen printing machine, so that the inner layer of the fabric has a water absorption effect.

[0003] However, the above-mentioned single-absorbent and single-proof fabrics have some problems: the adhesive blocks the gaps between fibers, hindering moisture transfer, and the layers are easily peeled off, resulting in moisture conduction failure; the composite process makes the fabric thick and heavy, and it is easy to delaminate after repeated washing; at the same time, the high-density waterproof layer is prone to stuffiness, and the low-density moisture-conducting layer is prone to water seepage. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention provides a preparation process of a single-absorption and single-protection fabric, which mainly solves the problems of poor structural stability, poor air permeability and low moisture conduction efficiency of the single-absorption and single-protection fabric in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A preparation process of a single-absorption and single-protection fabric comprises the following steps: Step 1: Material preparation: including hydrophilic yarn, water-repellent yarn and connecting yarn; Step 2: Weaving process: introducing the hydrophilic yarn, the water-repellent yarn and the connecting yarn into a circular knitting device to weave the grey fabric, wherein the circular knitting device comprises a first upper knitting needle, a second upper knitting needle, a first lower knitting needle and a second lower knitting needle, and the knitting method of the circular knitting device is: a. The first upper knitting needle and the second upper knitting needle are out of the needle, and the hydrophilic yarn and the connecting yarn are fed respectively, and the yarns are bent into loops, and the first lower knitting needle and the second lower knitting needle are in a floating thread state; b. The first lower knitting needle and the second lower knitting needle are out of the needle, the water-repellent yarn is fed, and the yarn is bent into a loop, and the first upper knitting needle and the second upper knitting needle are in a floating thread state; c. The first upper knitting needle is in a tuck state, the second upper knitting needle is in a floating state, the first lower knitting needle is in a tuck state, and the second lower knitting needle is in a floating state; d. The first upper knitting needle and the second upper knitting needle are out of the needle, the hydrophilic yarn is fed, and the yarn is bent into a loop, and the first lower knitting needle and the second lower knitting needle are in a floating thread state; e. The first lower knitting needle and the second lower knitting needle are out of the needle, the water-repellent yarn is fed, and the yarn is bent into a loop, and the first upper knitting needle and the second upper knitting needle are in a floating state; f. The first upper knitting needle is in a floating state, the second upper knitting needle is in a tucking state, the first lower knitting needle is in a floating state, and the second lower knitting needle is in a tucking state; The grey cloth comprises a waterproof layer and a water-absorbing layer, the waterproof layer covers the water-absorbing layer, the water-absorbing layer comprises a hydrophilic yarn and a connecting yarn, the waterproof layer comprises a water-repellent yarn, the water-repellent yarn covers the waterproof yarn, the waterproof layer and the water-absorbing layer are both provided with meshes, the meshes of the waterproof layer and the meshes of the water-absorbing layer are staggered, the connecting yarns are distributed at the meshes of the water-absorbing layer, and the hydrophilic yarns are distributed at the meshes of the waterproof layer; Step 3: Finishing process: Put the grey cloth into the setting machine, and control the temperature of the setting machine at 160℃~180℃ for 30~60 seconds to stabilize the fabric size and maintain the yarn function.

[0006] Furthermore, the feeding tension of the hydrophilic yarn in the circular knitting device is 15-20 cN, the feeding tension of the water-repellent yarn is 15.5-20.5 cN, the weaving density is 20-25 needles / inch, the bending depth is controlled at 0.5-0.8 mm, and the weaving speed is 18-22 rpm.

[0007] Furthermore, the ratio of the yarn arrangement of the waterproof layer to the yarn arrangement of the water absorbing layer is 1:1.2 to 1:1.5.

[0008] Furthermore, the hydrophilic yarn is a modified polyester filament, and its hydrophilic property is obtained by treatment with a polyurethane hydrophilic finishing agent, and the contact angle is ≤30°‌.

[0009] Furthermore, the hydrophilic yarn described in the above step 1 needs to be pretreated, including ultrasonic cleaning with a solution of ether and acetone mixed in a volume ratio of 1:1, with an ultrasonic frequency of 40kHz and a time of 10 to 15 minutes to remove surface oil and impurities, and then soaking in an acetic acid solution with a mass concentration of 5% for 20 to 30 minutes, a bath ratio of 1:20, and a temperature controlled at 45 to 50°C to enhance the activity of polar groups on the fiber surface, and finally washing with deionized water to neutrality, and drying in a hot air oven at 80 to 85°C to a moisture content of ≤2%, and maintaining the fiber elongation at break ≤20%.

[0010] Furthermore, the circular knitting device also includes a needle disk, an upper triangle seat, an upper triangle, a needle cylinder, a lower triangle seat, a lower triangle and an air jet assembly, wherein the needle disk is arranged on the upper side of the needle cylinder, the needle disk has an upper needle groove, the first upper knitting needle and the second upper knitting needle are arranged alternately in the upper needle groove of the needle disk in sequence, the upper triangle seat is arranged on the upper side of the needle disk, the upper triangle is arranged on the upper triangle seat, the upper triangle has a first upper knitting needle track and a second upper knitting needle track for sliding the needle butt of the first upper knitting needle and the needle butt of the second upper knitting needle, and the needle cylinder has There is a lower needle groove, the first lower knitting needle and the second lower knitting needle are arranged alternately in the lower needle groove of the needle cylinder in sequence, the lower triangular seat is arranged on the circumferential outer side of the needle cylinder, the lower triangle is arranged on the lower triangular seat, and the lower triangle has a first lower knitting needle track and a second lower knitting needle track for the butt of the first lower knitting needle and the butt of the second lower knitting needle to slide, the air jet assembly is arranged on the upper triangular seat, the air jet assembly has an air jet nozzle, the air jet nozzle is distributed between the needle disk and the needle cylinder, and the angle between the central axis of the air jet nozzle and the horizontal plane is 65°~72°.

[0011] Furthermore, the first upper knitting needle track includes a first loop forming groove, a first flat needle groove, a first loop collecting groove, a second loop forming groove, a second flat needle groove and a third flat needle groove in sequence.

[0012] Furthermore, the second upper knitting needle track includes a third loop forming groove, a fourth flat needle groove, a fifth flat needle groove, a fourth loop forming groove, a sixth flat needle groove and a second loop collecting groove in sequence.

[0013] Furthermore, the first lower knitting needle track includes a seventh flat needle groove, a fifth loop forming groove, a third loop collecting groove, an eighth flat needle groove, a sixth loop forming groove and a ninth flat needle groove in sequence.

[0014] Furthermore, the second lower knitting needle track includes the tenth flat needle groove, the seventh loop forming groove, the eleventh flat needle groove, the twelfth flat needle groove, the eighth loop forming groove and the fourth loop collecting groove in sequence.

[0015] By adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the preparation process of the single-absorbent and single-proof fabric, through the alternating looping action of the disc knitting device, simultaneously forms a waterproof layer and a water-absorbing layer in a single weaving, and distributes the connecting yarn in the mesh of the water-absorbing layer, and the hydrophilic yarn is embedded in the mesh of the waterproof layer to form mesh interlocking, thereby enhancing the interlayer bonding force, and can be firmly bonded without adhesives, thereby avoiding the risk of stratification in the lamination process and improving the stability of the fabric structure. Furthermore, the mesh holes are staggered to form capillary channels, thereby accelerating the directional migration of moisture from the waterproof layer to the water-absorbing layer, thereby achieving efficient moisture conduction, and at the same time, the gradient density design takes into account both waterproofness and breathability, and the heat setting process fixes the yarn shape to prevent moisture conduction failure caused by mesh deformation after washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structural diagram of a circular knitting device in an embodiment of the present invention; Figure 2 Schematic diagram of the distribution structure of the first upper knitting needle, the second upper knitting needle and the upper triangle in an embodiment of the present invention; Figure 3 Schematic diagram of the distribution structure of the first lower knitting needle, the second lower knitting needle and the lower triangle in an embodiment of the present invention; Figure 4 Schematic diagram of the configuration structure of the upper triangle and the lower triangle in an embodiment of the present invention; Figure 5 2 is a structural diagram of a fabric in an embodiment of the present invention.

[0017] Description of reference numerals: 1. Circular knitting device; 11. First upper knitting needle; 12. Second upper knitting needle; 13. First lower knitting needle; 14. Second lower knitting needle; 15. Needle disk; 16. Upper cam seat; 17. Upper cam; 18. Needle cylinder; 19. Lower cam seat; 20. Lower cam; 21. Jet assembly; 151, upper needle groove; 171, first upper knitting needle track; 172, second upper knitting needle track; 181, lower needle groove; 201, first lower knitting needle track; 202, second lower knitting needle track; 211, air jet; 301, the first circle-forming groove; 302, the first flat needle groove; 303, the first circle-collecting groove; 304, the second circle-forming groove; 305, the second flat needle groove; 306, the third flat needle groove; 401, the third circle-forming groove; 402, the fourth flat needle groove; 403, the fifth flat needle groove; 404, the fourth circle-forming groove; 405, the sixth flat needle groove; 406, the second circle-collecting groove; 501, the seventh flat needle groove; 502, the fifth circle-forming groove; 503, the third circle-collecting groove; 504, the eighth flat needle groove; 505, the sixth circle-forming groove; 506, the ninth flat needle groove; 601, the tenth flat needle groove; 602, the seventh circle-forming groove; 603, the eleventh flat needle groove; 604, the twelfth flat needle groove; 605, the eighth circle-forming groove; 606, the fourth circle-collecting groove. DETAILED DESCRIPTION

[0018] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0019] The embodiments of the present invention are: refer to Figures 1 to 5 As shown, a preparation process of a single-absorption and single-protection fabric comprises the following steps: Step 1: Material preparation: including hydrophilic yarn, water-repellent yarn and connecting yarn, wherein the connecting yarn is nylon yarn; Step 2: Weaving process: introducing the hydrophilic yarn, the water-repellent yarn and the connecting yarn into a circular knitting device to weave a grey cloth, wherein the circular knitting device 1 comprises a first upper knitting needle 11, a second upper knitting needle 12, a first lower knitting needle 13 and a second lower knitting needle 14, and the knitting method of the circular knitting device 1 is: a. The first upper knitting needle 11 and the second upper knitting needle 12 are out of the needle, and the hydrophilic yarn and the connecting yarn are fed respectively, and the yarns are bent into loops, and the first lower knitting needle 13 and the second lower knitting needle 14 are in a floating thread state; b. The first lower knitting needle 13 and the second lower knitting needle 14 are pulled out, the water-repellent yarn is fed, and the yarn is bent into a loop, and the first upper knitting needle 11 and the second upper knitting needle 12 are in a floating state; c. The first upper knitting needle 11 is in a tuck state, the second upper knitting needle 12 is in a floating state, the first lower knitting needle 13 is in a tuck state, and the second lower knitting needle 14 is in a floating state; d. The first upper knitting needle 11 and the second upper knitting needle 12 are out of the needle, the hydrophilic yarn is fed, and the yarn is bent into a loop, and the first lower knitting needle 13 and the second lower knitting needle 14 are in a floating state; e. The first lower knitting needle 13 and the second lower knitting needle 14 are out of the needle, the water-repellent yarn is fed, and the yarn is bent into a loop, and the first upper knitting needle 11 and the second upper knitting needle 12 are in a floating state; f. The first upper knitting needle 11 is in a floating state, the second upper knitting needle 12 is in a tucking state, the first lower knitting needle 13 is in a floating state, and the second lower knitting needle 14 is in a tucking state; The grey cloth comprises a waterproof layer and a water-absorbing layer, the waterproof layer covers the water-absorbing layer, the water-absorbing layer comprises a hydrophilic yarn and a connecting yarn, the waterproof layer comprises a water-repellent yarn, the water-repellent yarn covers the waterproof yarn, the waterproof layer and the water-absorbing layer are both provided with meshes, the meshes of the waterproof layer and the meshes of the water-absorbing layer are staggered, the connecting yarns are distributed at the meshes of the water-absorbing layer, and the hydrophilic yarns are distributed at the meshes of the waterproof layer; Step 3: Post-finishing process: Put the grey cloth into a setting machine, and control the temperature of the setting machine at 160°C to 180°C, preferably 175°C, for 30 to 60 seconds, preferably 45 seconds, to stabilize the fabric size and maintain the yarn function.

[0020] The preparation process of this single-absorbent and single-proof fabric forms a waterproof layer and a water-absorbing layer simultaneously in a single weaving process through the alternating looping action of the circular knitting device, and the connecting yarn is distributed in the mesh of the water-absorbing layer, and the hydrophilic yarn is embedded in the mesh of the waterproof layer to form mesh interlocking, thereby enhancing the bonding force between the layers, and can be firmly bonded without adhesives, thereby avoiding the risk of stratification in the lamination process and improving the stability of the fabric structure. Furthermore, the mesh holes are staggered to form capillary channels, thereby accelerating the directional migration of moisture from the waterproof layer to the water-absorbing layer, thereby achieving efficient moisture conduction. At the same time, the gradient density design takes into account both waterproofness and breathability, and the heat setting process fixes the yarn shape to prevent moisture conduction failure caused by mesh deformation after washing.

[0021] In addition, the feeding tension of the hydrophilic yarn in the circular knitting device 1 is 15-20 cN, preferably 17.5 cN, and the feeding tension of the water-repellent yarn is 15.5-20.5 cN, preferably 18 cN, to ensure that the yarn is evenly stressed during weaving to avoid yarn breakage or fabric skewness. The weaving density is 20-25 needles / inch, preferably 25 needles / inch, and the bending depth is controlled at 0.5-0.8 mm, preferably 0.6 mm, to balance the density of the waterproof layer and the yarn strength. The weaving speed is 18-22 rpm, preferably 20 rpm. The weaving speed matches the high-density weaving requirements and reduces the risk of skipped stitches.

[0022] Furthermore, the yarn arrangement ratio of the waterproof layer to the water-absorbing layer is 1:1.2 to 1:1.5, preferably 1:1.4, and the hydraulic potential difference is formed by the yarn density advantage of the waterproof layer to drive the unidirectional transfer of water.

[0023] Specifically, the hydrophilic yarn is a modified polyester filament, and its hydrophilic property is obtained by treating with a polyurethane hydrophilic finishing agent, with a contact angle of ≤30°. The polyurethane finishing agent gives the modified polyester filament a low contact angle, improves the capillary effect of the water-absorbing layer, and the chemically bonded finishing agent ensures that the hydrophilic property remains stable after 50 washes. Specifically, the hydrophilic yarn described in the above step 1 needs to be pretreated, including ultrasonic cleaning with a solution of ether and acetone mixed in a volume ratio of 1:1 in sequence, with an ultrasonic frequency of 40kHz and a time of 12 minutes to remove surface oil and impurities, and then with a mass concentration of 5% The fiber was immersed in acetic acid solution for 25 minutes, with a bath ratio of 1:20 and a temperature of 48°C to enhance the activity of polar groups on the fiber surface. Finally, it was washed with deionized water to neutrality and dried in a hot air oven at 80°C to a moisture content of ≤2% and a fiber elongation at break of ≤20%. The fiber was ultrasonically cleaned with a mixture of ether and acetone to remove oil impurities and avoid the effects of pretreatment residues on the adsorption of the hydrophilic finishing agent. The fiber was immersed in acetic acid solution to expose the carboxyl groups on the fiber surface and enhance the chemical bonding strength with the hydrophilic finishing agent. The fiber was then dried at low temperature to control the moisture content of the fiber to ≤2% to prevent the elongation at break from exceeding the standard due to high-temperature thermal damage.

[0024] In this embodiment, the circular knitting device 1 also includes a needle disk 15, an upper triangle seat 16, an upper triangle 17, a needle cylinder 18, a lower triangle seat 19, a lower triangle 20 and an air jet assembly 21, wherein the needle disk 15 is arranged on the upper side of the needle cylinder 18, and the needle disk 15 has an upper needle groove 151, wherein the first upper knitting needle 11 and the second upper knitting needle 12 are arranged alternately in the upper needle groove 151 of the needle disk 15 in sequence, the upper triangle seat 16 is arranged on the upper side of the needle disk 15, the upper triangle 17 is arranged on the upper triangle seat 16, and the upper triangle 17 has a first upper knitting needle track 171 and a second upper knitting needle track 172 for sliding the needle butt of the first upper knitting needle 11 and the needle butt of the second upper knitting needle 12, the needle cylinder 18 has a lower needle groove 181, wherein the first lower knitting needle 13 and the second lower knitting needle 14 are arranged alternately in the lower needle groove 181 of the needle cylinder 18 in sequence, and the lower triangle seat 19 is arranged on the circumferential outer side of the needle cylinder 18, the lower triangle 20 is arranged on the lower triangle seat 19, and the lower triangle 20 has a first lower knitting needle track 201 and a second lower knitting needle track 202 for sliding the needle butt of the first lower knitting needle 13 and the needle butt of the second lower knitting needle 14, the air jet assembly 21 is arranged on the upper triangle seat 16, and the air jet assembly 21 has an air jet nozzle 211, and the air jet nozzle 211 is distributed between the needle disk 15 and the needle cylinder 18, and the angle between the central axis of the air jet nozzle 211 and the horizontal plane is 65°~72°, preferably 70°, and the upper / lower triangle tracks drive the knitting needles to form circles, gather circles, and float lines in stages to realize the alternating weaving of the waterproof layer and the water absorbing layer, and the air jet nozzle 211 is inclined at an angle of 65°~72° to optimize the airflow direction, reduce the interference of the flying flower accumulation on the yarn tension, and at the same time ensure the presentation of the waterproof layer and the water absorbing layer mesh.

[0025] Further, the first upper knitting needle track 171 includes a first loop forming groove 301, a first flat needle groove 302, a first tuck groove 303, a second loop forming groove 304, a second flat needle groove 305 and a third flat needle groove 306 in sequence; the second upper knitting needle track 172 includes a third loop forming groove 401, a fourth flat needle groove 402, a fifth flat needle groove 403, a fourth loop forming groove 404, a sixth flat needle groove 405 and a second tuck groove 406 in sequence; the first lower knitting needle track 201 includes a first loop forming groove 301, a first flat needle groove 302, a first tuck groove 303, a second loop forming groove 304, a second flat needle groove 305 and a third tuck groove 306 in sequence; The second lower knitting needle track 202 includes the seventh flat needle groove 501, the fifth loop forming groove 502, the third collection loop groove 503, the eighth flat needle groove 504, the sixth loop forming groove 505 and the ninth flat needle groove 506 in sequence; the second lower knitting needle track 202 includes the tenth flat needle groove 601, the seventh loop forming groove 602, the eleventh flat needle groove 603, the twelfth flat needle groove 604, the eighth loop forming groove 605 and the fourth collection loop groove 606 in sequence, to ensure a smooth transition of the yarn tension during alternating loops to avoid overload and breakage of the yarn at the collection loop position.

[0026] At the same time, the mesh density of the waterproof layer is 120-150 holes / cm², preferably 120 holes / cm², the pore size is 0.1-0.3mm, preferably 0.2mm, which can block the penetration of liquid water while allowing gaseous water molecules to pass through; the mesh density of the water-absorbing layer is 80-100 holes / cm², preferably 80 holes / cm², the pore size is 0.5-0.8mm, preferably 0.6mm, forming a wider capillary channel to accelerate water diffusion, and the mesh staggered angle of the two is 45°-60°, preferably 60°, which increases the contact points between layers, improves shear resistance, avoids interlayer slippage due to differences in yarn density, and makes the structure balanced.

[0027] In this embodiment, the water-repellent yarn is a water-repellent polyester yarn, whose surface is modified with a perfluoro compound, and the contact angle is ≥150°. The specific process is: the surface of the polyester yarn is modified by a plasma with a normal pressure dielectric barrier discharge power of 300-500W, the treatment time is 5-10min, impurities are removed and amino polyethylene glycol hydroxyl groups are introduced to enhance the subsequent chemical grafting ability, and perfluoropolyether carboxylic acid and polycaprolactone are esterified to form a block copolymer, and its low surface energy characteristics are used to enhance the hydrophobicity, and then the perfluoropolyether modified polycaprolactone is dissolved in an organic solvent, and a porous microsphere coating is formed on the yarn surface by electrostatic spraying technology, the voltage is 15-20kV, the solution concentration is 8-12wt%, the spraying distance is 15-20cm, the roughness is increased to increase the contact angle, and the drying is carried out at 120-150°C for 30-60min to promote the chemical bonding between the perfluoro compound and the polyester fiber to ensure the durability of the coating.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A preparation process of a single-absorption and single-protection fabric, characterized in that: The following steps are involved: Step 1: Material preparation: including hydrophilic yarn, water-repellent yarn and connecting yarn; Step 2: Weaving process: introducing the hydrophilic yarn, the water-repellent yarn and the connecting yarn into a circular knitting device to weave the grey fabric, wherein the circular knitting device comprises a first upper knitting needle, a second upper knitting needle, a first lower knitting needle and a second lower knitting needle, and the knitting method of the circular knitting device is: a. The first upper knitting needle and the second upper knitting needle are out of the needle, and the hydrophilic yarn and the connecting yarn are fed respectively, and the yarns are bent into loops, and the first lower knitting needle and the second lower knitting needle are in a floating thread state; b. The first lower knitting needle and the second lower knitting needle are out of the needle, the water-repellent yarn is fed, and the yarn is bent into a loop, and the first upper knitting needle and the second upper knitting needle are in a floating thread state; c. The first upper knitting needle is in a tuck state, the second upper knitting needle is in a floating state, the first lower knitting needle is in a tuck state, and the second lower knitting needle is in a floating state; d. The first upper knitting needle and the second upper knitting needle are out of the needle, the hydrophilic yarn is fed, and the yarn is bent into a loop, and the first lower knitting needle and the second lower knitting needle are in a floating thread state; e. The first lower knitting needle and the second lower knitting needle are out of the needle, the water-repellent yarn is fed, and the yarn is bent into a loop, and the first upper knitting needle and the second upper knitting needle are in a floating state; f. The first upper knitting needle is in a floating state, the second upper knitting needle is in a tucking state, the first lower knitting needle is in a floating state, and the second lower knitting needle is in a tucking state; The grey cloth comprises a waterproof layer and a water-absorbing layer, the waterproof layer covers the water-absorbing layer, the water-absorbing layer comprises a hydrophilic yarn and a connecting yarn, the waterproof layer comprises a water-repellent yarn, the water-repellent yarn covers the waterproof yarn, the waterproof layer and the water-absorbing layer are both provided with meshes, the meshes of the waterproof layer and the meshes of the water-absorbing layer are staggered, the connecting yarns are distributed at the meshes of the water-absorbing layer, and the hydrophilic yarns are distributed at the meshes of the waterproof layer; Step 3: Finishing process: Put the grey cloth into the setting machine, and control the temperature of the setting machine at 160℃~180℃ for 30~60 seconds to stabilize the fabric size and maintain the yarn function.

2. The preparation process of the single-absorption and single-protection fabric according to claim 1, characterized in that: The feeding tension of the hydrophilic yarn in the circular knitting device is 15-20 cN, the feeding tension of the water-repellent yarn is 15.5-20.5 cN, the weaving density is 20-25 needles / inch, the bending depth is controlled at 0.5-0.8 mm, and the knitting speed is 18-22 rpm.

3. The preparation process of the single-absorption and single-protection fabric according to claim 1 is characterized in that: The yarn arrangement ratio of the waterproof layer to the yarn arrangement of the water absorbing layer is 1:1.2 to 1:1.

5.

4. The preparation process of the single-absorption and single-protection fabric according to claim 1 is characterized in that: The hydrophilic yarn is a modified polyester filament, and its hydrophilic property is obtained by treating with a polyurethane hydrophilic finishing agent, and the contact angle is ≤30°‌.

5. The preparation process of the single-absorption and single-protection fabric according to claim 4 is characterized in that: The hydrophilic yarn described in the above step 1 needs to be pretreated, including ultrasonic cleaning with a solution of ether and acetone mixed in a volume ratio of 1:1, with an ultrasonic frequency of 40kHz and a time of 10 to 15 minutes to remove surface oil and impurities, and then soaking in an acetic acid solution with a mass concentration of 5% for 20 to 30 minutes, a bath ratio of 1:20, and a temperature controlled at 45 to 50°C to enhance the activity of polar groups on the fiber surface. Finally, after washing with deionized water to neutrality, it is dried in a hot air oven at 80 to 85°C to a moisture content of ≤2%, and the fiber elongation at break is maintained at ≤20%.

6. The preparation process of the single-absorption and single-protection fabric according to any one of claims 1 to 5, characterized in that: The circular knitting device also includes a needle disk, an upper triangle seat, an upper triangle, a needle cylinder, a lower triangle seat, a lower triangle and an air jet assembly. The needle disk is arranged on the upper side of the needle cylinder. The needle disk has an upper needle groove. The first upper knitting needle and the second upper knitting needle are arranged alternately in the upper needle groove of the needle disk in sequence. The upper triangle seat is arranged on the upper side of the needle disk. The upper triangle is arranged on the upper triangle seat. The upper triangle has a first upper knitting needle track and a second upper knitting needle track for sliding the needle butt of the first upper knitting needle and the needle butt of the second upper knitting needle. The needle cylinder has a lower Needle groove, the first lower knitting needle and the second lower knitting needle are arranged alternately in the lower needle groove of the needle cylinder in sequence, the lower triangular seat is arranged on the circumferential outer side of the needle cylinder, the lower triangle is arranged on the lower triangular seat, and the lower triangle has a first lower knitting needle track and a second lower knitting needle track for sliding the needle butt of the first lower knitting needle and the needle butt of the second lower knitting needle, the air jet assembly is arranged on the upper triangular seat, the air jet assembly has an air jet nozzle, the air jet nozzle is distributed between the needle disk and the needle cylinder, and the angle between the central axis of the air jet nozzle and the horizontal plane is 65°~72°.

7. The preparation process of the single-absorption and single-protection fabric according to claim 6, characterized in that: The first upper knitting needle track includes a first loop forming groove, a first flat needle groove, a first loop collecting groove, a second loop forming groove, a second flat needle groove and a third flat needle groove in sequence.

8. The preparation process of the single-absorption and single-protection fabric according to claim 7, characterized in that: The second upper knitting needle track includes a third loop forming groove, a fourth flat needle groove, a fifth flat needle groove, a fourth loop forming groove, a sixth flat needle groove and a second loop collecting groove in sequence.

9. The preparation process of the single-absorption and single-protection fabric according to claim 8, characterized in that: The first lower knitting needle track includes a seventh flat needle groove, a fifth loop forming groove, a third tuck loop groove, an eighth flat needle groove, a sixth loop forming groove and a ninth flat needle groove in sequence.

10. The preparation process of the single-absorption and single-protection fabric according to claim 9, characterized in that: The second lower knitting needle track includes the tenth flat needle groove, the seventh loop forming groove, the eleventh flat needle groove, the twelfth flat needle groove, the eighth loop forming groove and the fourth loop collecting groove in sequence.

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