Double-gradient anti-perspiration self-heating wool flock flocculus and preparation method thereof

Abstract

The invention discloses a double-gradient anti-perspiration self-heating wool flocculus which is formed by compounding a hydrophobic wool flocculus layer, a damp-heat conversion acrylic fiber wool flocculus layer and a wetting guide wool flocculus layer in a needling mode. 40-60% of a hydrophobic wool flocculus layer, 30-40% of a damp-heat conversion acrylic wool flocculus layer and 10-30% of a wetting guide wool flocculus layer, and the proportion of the three layers is gradually reduced layer by layer from the hydrophobic wool flocculus layer to the wetting guide wool flocculus layer; the convex points on the lower surface of the hydrophobic wool flocculus layer correspond to the convex points on the upper surface of the damp-heat conversion acrylic wool flocculus layer in a staggered manner; and the salient points on the upper surface of the wetting guide wool wool flocculus layer correspond to the salient points on the lower surface of the damp-heat conversion acrylic fiber wool flocculus layer in a staggered manner. The invention further discloses a preparation method of the double-gradient anti-perspiration self-heating wool wool flocculus. The double-gradient anti-perspiration self-heating wool down flocculus provided by the invention solves the problem that a traditional wool material cannot solve discomfort caused by sweat retention.

Description

Technical Field

[0001] The invention belongs to the technical field of textile materials and functional textiles, and specifically relates to a double-gradient anti-night sweat self-heating wool flannel flake. The invention also relates to a preparation method of the double-gradient anti-night sweat self-heating wool flannel flake. Background Art

[0002] As people's requirements for quality of life and comfort continue to increase, wool materials are widely used in various types of clothing and household items due to their excellent thermal insulation and breathability. However, traditional wool materials are still insufficient in terms of waterproof, breathable and self-heating functions, and cannot effectively solve the discomfort caused by sweat retention. Therefore, the development of a wool flake with dual-gradient anti-night sweat and self-heating properties has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to provide a double-gradient anti-night sweat self-heating wool flannel sheet, which solves the problem that traditional wool materials cannot effectively solve the discomfort caused by sweat retention.

[0004] The second object of the present invention is to provide a method for preparing the above-mentioned double-gradient anti-night sweat self-heating wool flannel flakes.

[0005] The first technical solution adopted by the present invention is that the double-gradient anti-night sweat self-heating wool flannel is formed by stacking a hydrophobic wool flannel layer, a moisture-heat conversion acrylic wool flannel layer and a wet-guiding wool flannel layer in sequence and compounding them by acupuncture using a deviation-type acupuncture method; in terms of total mass percentage, the hydrophobic wool flannel layer is 40%-60%, the moisture-heat conversion acrylic wool flannel layer is 30-40%, and the wet-guiding wool flannel layer is 10-30%, and the ratio between the three layers decreases layer by layer from the hydrophobic wool flannel layer to the wet-guiding wool flannel layer by 60%-10%; The hydrophobic wool fleece flake layer forms convex dots on the lower surface after single-sided roller staggered microstructure printing, the wetting guiding wool fleece flake layer forms convex dots on the upper surface after single-sided roller staggered microstructure printing, and the wet heat conversion acrylic wool fleece flake layer forms convex dots on both sides after double-sided double roller staggered microstructure printing. The convex dots on the lower surface of the hydrophobic wool fleece flake layer correspond to the convex dots on the upper surface of the wet heat conversion acrylic wool fleece flake layer in an alternating manner; the convex dots on the upper surface of the wetting guiding wool fleece flake layer correspond to the convex dots on the lower surface of the wet heat conversion acrylic wool fleece flake layer in an alternating manner.

[0006] The present invention is also characterized in that: The hydrophobic wool flannel layer has a gram weight of 120-180g / m² and a thickness of 2-6mm; the hydrophobic wool flannel layer is obtained by hydrophobic finishing of wool fibers with a diameter of 8-30μm and a length of 20-60mm with a hydrophobic finishing agent having a purity greater than or equal to 99%.

[0007] The weight of the wet heat conversion acrylic wool flannel layer is 80-120g / m 2 , thickness is 2-5mm; the wet heat conversion acrylic wool flannel layer is formed by a uniform mixture of wool fiber and hygroscopic heat-generating fiber. By mass percentage, the wool fiber is 60%-80%, the hygroscopic heat-generating fiber is 20%-40%, the wool fiber has a diameter of 8-30μm and a length of 20-60mm, and the hygroscopic heat-generating fiber is a hygroscopic heat-generating polyacrylonitrile fiber with a diameter of 10-20μm and a length of 30-60mm.

[0008] The wet-guided wool flannel layer has a gram weight of 40-60g / m² and a thickness of 1-4mm. The wet-guided wool flannel layer is obtained by hydrophilically finishing wool fibers with a diameter of 8-30μm and a length of 20-60mm with a hydrophilic softener having a concentration greater than or equal to 30%.

[0009] The staggered microstructure printing roller has a length of 100-120cm and a diameter of 20-25cm. A plurality of square convex rows are arranged in sequence on the surface of the staggered microstructure printing roller. The plurality of square convex rows are arranged in an N / N+1 cycle, where N≥3. A porous mesh is arranged on the square convex surface, where each square convex surface has a size of 5cm×5cm×1cm. An electric heating wire heating element is arranged inside the staggered microstructure printing roller, with a temperature of 100-150°C and a pressure strength of 1-2MPa.

[0010] The second technical solution adopted by the present invention is a method for preparing a double-gradient anti-night sweat self-heating wool flannel sheet, and the specific steps are as follows: S1, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and performing hydrophobic finishing to obtain a hydrophobic wool flake layer; S2, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and moisture-absorbing heat-generating polyacrylonitrile fibers with a diameter of 10-20 μm and a length of 30-60 mm, and mixing the two evenly to obtain a moisture-heat conversion acrylic wool flannel layer; S3, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and performing hydrophilic finishing to obtain a wet-guided wool flake layer; S4. The fibers of each flocculent layer are loosened and laid, and then subjected to staggered microstructure printing roller treatment, so that the concave structure formed by the lower surface of the hydrophobic wool flocculent layer and the upper surface of the moisture-heat conversion acrylic wool flocculent layer are staggered, and the concave structure of the upper surface of the wet-guide wool flocculent layer and the lower surface of the moisture-heat conversion acrylic wool flocculent layer are staggered. Finally, the three-layer fiber layer is composited by the deviation needle punching process to obtain a double-gradient anti-night sweat self-heating wool flocculent.

[0011] The present invention is also characterized in that: The wool fibers used in S1 and S3 need to be partially descaled in advance. The specific method for partially descaling the wool fibers is as follows: Step 1, soaking the wool fiber to be treated in a polyoxyethylene-octylphenyl ether solution with a concentration of 0.1%-0.5% and a bath ratio of 1:10-20 to obtain pretreated wool fiber; Step 2, preparation of oxidation pretreatment solution: preparing an oxidation pretreatment solution with a concentration of 3%-5% according to a bath ratio of 1:5-10 and stirring evenly, wherein the oxidizing agent in the oxidation pretreatment solution is sodium bromate, potassium permanganate, sodium hypochlorite or hydrogen peroxide; Step 3, using a sodium hydroxide solution with a concentration of 0.1%-1% to adjust the pH value of the oxidation pretreatment solution to control the pH value of the oxidation pretreatment solution to 6-7; Step 4, soaking the pretreated wool fiber in an oxidative pretreatment solution at a temperature between 30 and 60° C. for a treatment time of 30 min, 60 min, 90 min or 120 min; Step 5, cleaning and drying: rinse the treated wool fiber with clean water to remove residual reagents, and then use a double roller pressing device to press out excess water in the fiber, wherein the processing rate is 10-30m / min, and the roller pressure is 2-5kg / cm². Finally, put the rinsed wool fiber into a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C to obtain partially descaled wool fiber.

[0012] The specific steps of hydrophobic finishing of wool fibers in S1 are as follows: S1.1, respectively selecting some descaling wool fibers, a hydrophobic finishing agent and graphene oxide; S1.2. Weigh the weight of partially descaled wool fiber as A1, and calculate the hydrophilicity of wool as B1%. Then the amount of hydrophobic finishing agent C1=(A1+A1* B1%)*4%. Prepare the amount of hydrophobic finishing solution D1=C1+ A1* B1%. Disperse graphene oxide in deionized water, stir thoroughly with an ultrasonic processor to obtain a graphene oxide dispersion with a concentration of 0.1-1.0%. Add the graphene oxide dispersion into the hydrophobic finishing agent D1 solution four times, and the ratio of graphene oxide dispersion to hydrophobic finishing solution D1 is 1:1~3. S1.3, partially descaled wool fibers are used as substrates and completely immersed in the hydrophobic finishing agent D1 at a treatment temperature of 15-30°C for 30-120 min; S1.4. Use a double roller pressing device to press the wool fiber after hydrophobic treatment to remove excess water at a rate of 10-30m / min, and the roller pressure is 2-5kg / cm²; then put the wool fiber into a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C to obtain a hydrophobic wool flake layer.

[0013] The specific steps of hydrophilic finishing of wool fibers in S3 are as follows: S3.1, respectively selecting partially descaled wool, a hydrophilic finishing agent and polyvinyl alcohol; S3.2. Weigh a portion of descaled wool fibers, with a weight of A2 and a weight of a hydrophilic finishing agent, with a bath ratio of 1:X, where X ranges from 4 to 10. Prepare a hydrophilic finishing agent solution C2 with a concentration of Yg / L according to the bath ratio, where Y ranges from 20 to 40; disperse polyvinyl alcohol in deionized water at a concentration of Z%, where Z ranges from 1 to 10; mix the polyvinyl alcohol solution with the hydrophilic finishing agent solution C2, stir evenly and prepare a mixed solution D2=0.001 A2X*(1+Y+Z), where the ratio of the polyvinyl alcohol solution to the hydrophilic finishing agent solution C2 is 1:0.5~1; S3.3, completely immersing the partially descaled wool fibers in the hydrophilic finishing agent D2 for treatment at a temperature of 15-30°C for 10-30 minutes; S3.4. Use a double roller pressing device to press the excess water from the hydrophilic treated wool fiber at a rate of 10-30m / min, and the roller pressure is 2-5kg / cm²; then place the wool fiber at a temperature of 40-70°C for curing for 30-60min; finally, place the cured wool fiber in a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C.

[0014] S4 specific method: S4.1, opening the hydrophilic wool fiber group, the hygroscopic and heat-generating acrylic wool fiber group, and the hydrophobic wool fiber group respectively by an opening machine to obtain loose fibers; S4.2, firstly combing the loose hydrophilic wool fiber bundle, the hygroscopic and heat-generating acrylic fiber bundle and the hydrophobic fiber bundle respectively by a carding machine, and then air-laying the fibers by an air-laying machine to obtain a hydrophilic fiber web, a hygroscopic and heat-generating fiber web and a hydrophobic fiber web respectively; S4.3, passing the unneedled flakes after laying through the web through an interlaced microstructure printing roller to form an N / N+1 sequential concave structure, so that the concave structure formed by the lower surface of the hydrophobic wool flake layer and the upper surface of the wet heat conversion acrylic wool flake layer are interlaced, and the concave structure formed by the upper surface of the wet guide wool flake layer and the lower surface of the wet heat conversion acrylic wool flake layer are interlaced; S4.4. Using a deviation-type needling process to compound three fiber layers, during the needling process of the three flake layers, the needling angle changes in a deviation-type manner, from 90° perpendicular to the flake direction to 85°-90°, and then to 90°-95° ​​to form a needling angle change cycle, that is, the needling angle changes in the order of 90°, 85°-90°, and 90°-95°; During the acupuncture process, the acupuncture depth is controlled to be 10-30 mm, the acupuncture density is controlled to be 40-70 needles / cm², and the acupuncture speed is controlled to be 1-5 m / min to obtain a double-gradient anti-night sweat self-heating wool flannel flake.

[0015] The beneficial effects of the present invention are: (1) The double-gradient anti-night sweat self-heating wool flannel of the present invention arranges a hydrophobic wool flannel layer, a moisture-heat conversion acrylic wool flannel layer and a moisture-guiding wool flannel layer with different moisture absorption properties in sequence; the flannel collects water vapor through the moisture-guiding wool flannel layer close to the human skin on the chemical moisture gradient, and utilizes the moisture-absorbing and heat-generating functional fibers in the moisture-heat conversion acrylic wool flannel layer to convert water vapor into heat energy, thereby increasing the temperature of the external environment around the human body, and utilizes the upper hydrophobic flannel layer to effectively prevent the reverse transmission of water after it is conducted out of the human body; on the pore gradient of the flannel, the mass between each layer increases or decreases in sequence, forming a gradient change in pores, thereby improving the wicking efficiency of the flannel for water vapor; (2) The double-gradient anti-night sweat self-heating wool flannel of the present invention adopts a biased needle-punched multi-layer composite technology and staggered microstructure printing between each flannel layer, so that the fiber entanglement between each layer of flannel increases, further improving the strength of the bonding between the flannels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the double-gradient anti-night sweat self-heating wool flannel of the present invention; Figure 2 is a schematic diagram of the structure of the staggered microstructure printing roller of the present invention; Figure 3 It is a schematic diagram of the corresponding three-dimensional structure between the concave-convex microstructure layers of the double-gradient anti-night sweat self-heating wool flannel of the present invention; Figure 4 It is a schematic diagram of the corresponding cross-sectional structure between the concave-convex microstructure layers of the double-gradient anti-night sweat self-heating wool flannel of the present invention; Figure 5 This is a schematic diagram of the plane structure of the acupuncture deviation angle in the present invention; Figure 6 It is a schematic diagram of the overall structure of the deviation-type acupuncture in the present invention.

[0017] In the figure, 1. hydrophobic wool velvet flake layer, 2. moisture-heat conversion acrylic wool velvet flake layer, 3. moisture-guiding wool velvet flake layer. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Double gradient anti-night sweat self-heating wool velvet flannel, such as Figure 1 As shown, a hydrophobic wool fleece flake layer 1, a moisture-heat conversion acrylic wool fleece flake layer 2 and a moist guiding wool fleece flake layer 3 are sequentially stacked and compounded by a deviation needle punching method; in terms of total mass percentage, the hydrophobic wool fleece flake layer 1 is 40%-60%, the moisture-heat conversion acrylic wool fleece flake layer 2 is 30-40%, and the moist guiding wool fleece flake layer 3 is 10-30%, and the ratio between the three layers decreases layer by layer from 60%-10% from the hydrophobic wool fleece flake layer 1 to the moist guiding wool fleece flake layer 3, that is, the gram weight ratio of the three layers decreases layer by layer, and the gram weight gradually decreases from the uppermost hydrophobic wool fleece flake layer 1 to the lowermost moist guiding wool fleece flake layer 3, showing a gradient change.

[0020] The hydrophobic wool flannel layer 1 forms convex points on the lower surface after single-sided roller staggered microstructure printing, the wetting guide wool flannel layer 3 forms convex points on the upper surface after single-sided roller staggered microstructure printing, and the wet heat conversion acrylic wool flannel layer 2 forms convex points on both sides after double-sided double roller staggered microstructure printing. The convex points on the lower surface of the hydrophobic wool flannel layer 1 correspond to the convex points on the upper surface of the wet heat conversion acrylic wool flannel layer 2; the convex points on the upper surface of the wetting guide wool flannel layer 3 correspond to the convex points on the lower surface of the wet heat conversion acrylic wool flannel layer 2. Through special material selection and interlayer structure design, excellent anti-sweating and self-heating effects are achieved, thereby improving the comprehensive performance of the wool flannel.

[0021] The hydrophobic wool fleece flake layer, the moisture-heat conversion acrylic wool fleece flake layer and the wetting-guide wool fleece flake layer are passed through the staggered microstructure printing roller to form an N / N+1 sequential convex structure, and riveting points are formed between adjacent layers to improve the uniformity of the flake gradient change and enhance the overall tensile performance of the flake; the adjacent layers of the hydrophobic wool fleece flake layer, the moisture-heat conversion acrylic wool fleece flake layer and the wetting-guide wool fleece flake layer are respectively provided with entangled parts formed by fibers extended and entangled with each other by the deviation needling action of the needling equipment, so as to improve the uniformity and bonding strength of the flakes.

[0022] Furthermore, the hydrophobic wool flannel layer 1 has a gram weight of 120-180g / m² and a thickness of 2-6mm; the hydrophobic wool flannel layer 1 is obtained by hydrophobically finishing wool fibers with a diameter of 8-30μm and a length of 20-60mm with a hydrophobic finishing agent having a purity greater than or equal to 99%, and the water contact angle of the hydrophobic wool flannel layer 1 is 50°-70°, achieving excellent hydrophobic performance.

[0023] Furthermore, the weight of the wet heat conversion acrylic wool flannel layer is 80-120g / m 2 , with a thickness of 2-5mm; the wet heat conversion acrylic wool flannel layer 2 is formed by a uniform mixture of wool fibers and hygroscopic heat-generating fibers. By mass percentage, the wool fibers are 60%-80%, the hygroscopic heat-generating fibers are 20%-40%, the wool fibers have a diameter of 8-30μm and a length of 20-60mm, and the hygroscopic heat-generating fibers are hygroscopic heat-generating polyacrylonitrile fibers with a diameter of 10-20μm and a length of 30-60mm, wherein the hygroscopic heat-generating fibers are one or two of the Yirebao fibers and the WARMWINTER hygroscopic heat-generating fibers. Since the hygroscopic heat-generating fibers have a large number of hydrophilic groups, the kinetic energy of water molecules in the moisture can be converted into heat energy during the hygroscopic process, thereby improving the warmth retention of the flannel.

[0024] Furthermore, the wetting-guiding wool flannel layer 3 has a gram weight of 40-60g / m² and a thickness of 1-4mm. The wetting-guiding wool flannel layer 3 is obtained by hydrophilically finishing wool fibers with a diameter of 8-30μm and a length of 20-60mm with a hydrophilic softener having a concentration greater than or equal to 30%. The water contact angle of the wetting-guiding wool flannel layer 3 is 100°-130°, showing good hydrophilicity.

[0025] The three-layer flake combination structure forms a wettability difference through chemical gradient changes, achieving unidirectional conduction of moisture, and forms a pore gradient change through density changes in the vertical direction to enhance the water vapor wicking effect; under the joint action of the double gradients, it solves the problem of moisture retention while improving warmth.

[0026] Furthermore, in order to make the formed chemical wetting gradient and pore size change gradient more uniform, improve the unidirectional moisture conduction ability, and at the same time enhance the bonding force between the layers and the tensile performance of the flakes, the layers of flakes after laying are subjected to microstructural treatment through an interlaced microstructure printing roller to form an N / N+1 sequential concave structure. The number of roller microstructure stamping meshes varies in the order of N meshes and N+1 meshes. After the flakes pass through the roller, an N / N+1 concave structure is formed, which facilitates the riveting between the layers of flakes.

[0027] Specifically, Figure 2 As shown, the staggered microstructure printing roller has a length of 100-120cm and a diameter of 20-25cm. A plurality of square convex rows are arranged in sequence on the surface of the staggered microstructure printing roller, and the plurality of square convex rows are arranged in an N / N+1 cycle, wherein N≥3. A porous mesh is arranged on the square convex surface, wherein the size of each square convex surface is 5cm×5cm×1cm. An electric heating wire heating element is arranged inside the staggered microstructure printing roller, and a temperature control system ensures that the temperature is 100-150°C. A hydraulic device is provided to control the pressure intensity at 1-2MPa.

[0028] When the punching and heating mesh on the roller contacts the flakes, under the dual action of high temperature and air pressure, the surface of the flakes is punched to form a concave microstructure, such as Figure 3 As shown, after punching, the flakes form a concave-convex microstructure. At the same time, due to the arrangement of 3 / 4 meshes on the roller, the concave meshes 8 formed after the roller treatment on the upper layer of the flakes correspond to the unpunched part 9 on the lower layer.

[0029] The preparation method of the double-gradient anti-night sweat self-heating wool flannel sheet comprises the following specific steps: S1. Select wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and perform hydrophobic finishing to obtain a hydrophobic wool flake layer. The specific steps of performing hydrophobic finishing on the wool fibers are as follows: S1.1, select partially descaled wool fiber (partial descaling treatment is as follows) as the base material, hydrophobic finishing agent, and graphene oxide as the hydrophobic reinforcing material; S1.2. Weigh the weight of partially descaled wool fiber as A1, and calculate the hydrophilicity of wool as B1%. Then the amount of hydrophobic finishing agent C1=(A1+A1* B1%)*4%. Prepare the amount of hydrophobic finishing solution D1=C1+ A1* B1%. Disperse graphene oxide in deionized water, stir thoroughly with an ultrasonic processor to obtain a graphene oxide dispersion with a concentration of 0.1-1.0%. Add the graphene oxide dispersion into the hydrophobic finishing agent D1 solution four times, and the ratio of graphene oxide dispersion to hydrophobic finishing solution D1 is 1:1~3. S1.3, partially descaled wool fibers are used as substrates and completely immersed in the hydrophobic finishing agent D1 at a treatment temperature of 15-30°C for 30-120 min; S1.4. Use a double roller pressing device to press the wool fiber after hydrophobic treatment to remove excess water at a rate of 10-30m / min, and the roller pressure is 2-5kg / cm²; then put the wool fiber into a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C to obtain a hydrophobic wool flake layer.

[0030] S2, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and moisture-absorbing heat-generating polyacrylonitrile fibers with a diameter of 10-20 μm and a length of 30-60 mm, and mixing the two evenly to obtain a moisture-heat conversion acrylic wool flannel layer; S3, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and performing hydrophilic finishing to obtain a wet-guided wool flake layer; the specific steps of performing hydrophilic finishing on the wool fibers are as follows: S3.1. Select partially descaled wool (partial descaling treatment is as follows) as the base material, a hydrophilic finishing agent with a concentration greater than or equal to 30%, and polyvinyl alcohol as the reinforcing agent; S3.2. Weigh a portion of descaled wool fibers, with a weight of A2 and a weight of a hydrophilic finishing agent, with a bath ratio of 1:X, where X ranges from 4 to 10. Prepare a hydrophilic finishing agent solution C2 with a concentration of Yg / L according to the bath ratio, where Y ranges from 20 to 40; disperse polyvinyl alcohol in deionized water at a concentration of Z%, where Z ranges from 1 to 10; mix the polyvinyl alcohol solution with the hydrophilic finishing agent solution C2, stir evenly and prepare a mixed solution D2=0.001 A2X*(1+Y+Z), where the ratio of the polyvinyl alcohol solution to the hydrophilic finishing agent solution C2 is 1:0.5~1; S3.3, completely immersing the partially descaled wool fibers in the hydrophilic finishing agent D2 for treatment at a temperature of 15-30°C for 10-30 minutes; S3.4. Use a double roller pressing device to press the excess water from the hydrophilic treated wool fiber at a rate of 10-30m / min, and the roller pressure is 2-5kg / cm²; then place the wool fiber at a temperature of 40-70°C for curing for 30-60min; finally, place the cured wool fiber in a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C.

[0031] S4, after performing staggered microstructure printing roller treatment on each flocculent layer, the layer is laid in a gradient decreasing manner, so that the concave structure formed by the lower surface of the hydrophobic wool flocculent layer and the upper surface of the wet heat conversion acrylic wool flocculent layer are staggered, and the concave structure of the upper surface of the wet guide wool flocculent layer and the lower surface of the wet heat conversion acrylic wool flocculent layer are staggered, and finally the three layers are compounded by a deviation needle punching method, that is, a double gradient anti-night sweat self-heating wool flocculent is obtained, and the specific steps are as follows: S4.1, opening the hydrophilic wool fiber group, the hygroscopic and heat-generating acrylic wool fiber group, and the hydrophobic wool fiber group respectively by an opening machine to obtain loose fibers; S4.2, firstly combing the loose hydrophilic wool fiber bundle, the hygroscopic and heat-generating acrylic fiber bundle and the hydrophobic fiber bundle respectively by a carding machine, and then air-laying the fibers by an air-laying machine to obtain a hydrophilic fiber web, a hygroscopic and heat-generating fiber web and a hydrophobic fiber web respectively; S4.3, passing the unneedled flakes after laying through the web through an interlaced microstructure printing roller to form an N / N+1 sequential concave structure, so that the concave structure formed by the lower surface of the hydrophobic wool flake layer and the upper surface of the wet heat conversion acrylic wool flake layer are interlaced, and the concave structure formed by the upper surface of the wet guide wool flake layer and the lower surface of the wet heat conversion acrylic wool flake layer are interlaced; S4.4. The three-layer fiber layer is composited by using the deviation needling process. During the needling process of the three-layer flocculent layer, the needling angle changes in a deviation manner. The needling angle changes from 90° perpendicular to the flocculent direction to 85°-90°, and then to 90°-95° ​​to form a needling angle change cycle, that is, the needling angle changes in the order of 90°, 85°-90°, and 90°-95°. During the needling process, the contact area between the fibers in the flocculent and the needles is increased, the fiber connections between the floccules are increased, and the bonding force between the floccules is enhanced.

[0032] During the needling process, the needling depth is controlled to be 10-30mm, the needling density is controlled to be 40-70 needles / cm², and the needling speed is controlled to be 1-5m / min, so as to obtain a double-gradient anti-night sweat self-heating wool flannel flake. At the same time, due to the staggered configuration of the concave and convex points between the flakes, the double gradient change is more uniform.

[0033] During the flake needle punching process, the fiber entanglement points of the upper and lower flake layers increase, making the chemical gradient and pore size change gradient formed by the three-layer structure more uniform. This improvement improves the unidirectional conduction ability of moisture and enhances the bonding strength and stretchability between the layers.

[0034] In the above preparation process, the wool fibers used in the hydrophobic wool flake layer 1 and the wet-guiding wool flake layer 3 in S1 and S3 are partially descaled by oxidation to enhance the hydrophobic and hydrophilic treatment effect of the finishing agent on the wool. The specific method for partially descaling the wool fibers is as follows: Step 1, soaking the wool fiber to be treated in a polyoxyethylene-octylphenyl ether solution with a concentration of 0.1%-0.5% and a bath ratio of 1:10-20 to remove impurities and grease to ensure the treatment effect, thereby obtaining pretreated wool fiber; Step 2, preparation of oxidation pretreatment solution: preparing an oxidation pretreatment solution with a concentration of 3%-5% according to a bath ratio of 1:5-10 and stirring uniformly, wherein the oxidizing agent in the oxidation pretreatment solution is any one of sodium bromate, potassium permanganate, sodium hypochlorite or hydrogen peroxide; Step 3, using a sodium hydroxide solution with a concentration of 0.1%-1% to adjust the pH value of the oxidation pretreatment solution, and controlling the pH value of the oxidation pretreatment solution to 6-7 to reduce damage to the wool; Step 4, soaking the pretreated wool fiber in an oxidative pretreatment solution at a treatment temperature between 30-60°C, and setting the time gradient to 30min, 60min, 90min or 120min according to the desired treatment effect; Step 5, cleaning and drying: Rinse the treated wool fiber with clean water to ensure that the residual reagent is completely removed, and then use a double roller pressing device to press out excess water in the fiber, where the processing rate is 10-30m / min and the roller pressure is 2-5kg / cm². Finally, put the rinsed wool fiber into a drying device and dry it for 1-2 hours to ensure that the fiber is completely dry. The drying temperature is 30-50°C to obtain partially descaled wool fiber with a diameter of 8-30μm and a length of 20-60mm.

[0035] Example 1 The preparation method of the double-gradient anti-night sweat self-heating wool flannel sheet comprises the following specific steps: The steps of partially descaling wool fiber finishing are as follows: soaking the wool fiber to be treated in a 0.5% (w / v) polyoxyethylene-octylphenyl ether solution at a bath ratio of 1:10, preparing a 5% sodium bromate solution at a bath ratio of 1:5 and uniformly stirring the solution; using a 1% (w / v) sodium hydroxide solution to adjust the pH value within a range of 6-7 to reduce damage to the wool; soaking the pretreated wool fiber in the sodium bromate solution, controlling the temperature at 40°C, and setting the time for 60 minutes; rinsing the wool fiber thoroughly with clean water after treatment to ensure that the residual reagent is completely removed; using a double roller pressing device at a low speed of 20m / min and a roller pressure of 3kg / cm² to press out excess moisture in the fiber; placing the rinsed wool fiber in a drying device, controlling the temperature at 30°C, and drying for 1 hour to ensure that the fiber is completely dry, thereby obtaining partially descaling wool fiber with a diameter of 10μm and a length of 55mm.

[0036] The specific steps of hydrophobic finishing of wool fibers were as follows: partially descaled wool with a diameter of 10 μm and a length of 55 mm was selected as the substrate, HY-31 hydrophobic finishing agent (Dongguan Hongyun Textile Auxiliary Co., Ltd.) was used as the wool hydrophobic treatment agent, and graphene oxide was used as the hydrophobic enhancer.

[0037] The weight of the wool was 200g, and the saturated hydrophilicity of the wool was calculated to be about 583%; the hydrophobic finishing agent was 27.32g; a hydrophobic finishing solution of 610.32 was prepared; graphene oxide was dispersed in deionized water at 1.0%, and an ultrasonic processor was used to fully stir to ensure uniform dispersion; the graphene oxide dispersion was added to the HY-31 hydrophobic finishing agent solution 4 times to ensure that the two were fully mixed, and the ratio of graphene oxide dispersion to hydrophobic finishing solution was 1:1; the wool substrate was completely immersed in the finishing agent, the temperature was set to 30°C, and the time was 40min; a double roller pressing device was used to press the excess water in the fiber at a low speed of 20m / min and a roller pressure of 3kg / cm²; the rinsed wool fiber was placed in a drying device, the temperature was controlled at 40°C, and a low-temperature drying treatment was performed for 1 hour to obtain a weight of 180g / m2 , hydrophobic wool flannel with a thickness of 6mm.

[0038] Weigh 90 g of wool fiber with a diameter of 8 μm and a length of 50 mm and 40 g of Yirebao fiber with a diameter of 10 μm and a length of 50 mm (produced by Shanghai Zhengjia Milk Silk Technology Co., Ltd.) and mix them evenly to prepare a 120 g / m 2 , a 4mm thick wet heat conversion acrylic wool flannel layer.

[0039] The specific steps of hydrophilic finishing of wool fiber are as follows: select partially descaled wool with a diameter of 10 μm and a length of 55 mm as the substrate, select SS-64 hydrophilic finishing agent (Dongguan Silicon Soft Biotechnology Co., Ltd.) as the wool hydrophilic treatment reagent, and polyvinyl alcohol (PVA) as the reinforcing agent; weigh the partially descaled wool to weigh 100 g, set the bath ratio to 1:10, prepare 20 g / L of hydrophilic finishing agent solution, disperse 1% of polyvinyl alcohol in deionized water to form a polyvinyl alcohol solution, mix the polyvinyl alcohol solution with the hydrophilic finishing agent solution, and the ratio of the polyvinyl alcohol solution to the hydrophilic finishing agent solution is C2. 1:0.5, stir evenly to prepare 1030g of mixed solution; immerse the wool substrate completely in the mixed solution, set the temperature to 25°C, and the time to 15min; take out the wool sample, and use a double roller pressing device at a low speed of 20m / min and a roller pressure of 3kg / cm² to press out excess moisture in the fiber; place the wool sample at 50°C for curing treatment for 60min to ensure that the polyvinyl alcohol and the hydrophilic finishing agent are fully combined; put the cured wool fiber into the drying equipment, control the temperature at 50°C, and perform low-temperature drying for 1 hour to obtain a weight of 60g / m 2 , a moisturizing guiding wool flannel layer with a thickness of 2 mm.

[0040] Preparation of double-gradient anti-night sweat self-heating wool flannel: First, hydrophilic wool fiber group, hygroscopic heat-generating acrylic wool fiber group, and hydrophobic wool fiber group are opened by an opener to obtain obvious fiber bundles, and then the opened fiber bundles are sent to a carding machine for carding. After the fiber bundles are carded into a single fiber state, they are input into an air-laid web machine for air-laid web making to form a fiber web with three-dimensional random arrangement of fibers. Then, the fiber web passes through a staggered microstructure printing roller structure with a length of 100 cm and a diameter of 20 cm, and has different numbers of square convex surfaces (5 cm × 5 cm × 1 cm) and stamping and heating meshes on the surface. When the flannel passes through, the stamping and heating meshes on the roller contact the flannel, and under the dual action of high temperature and air pressure, the surface of the flannel is stamped to form a concave microstructure. After stamping, the flannel forms a concave-convex microstructure. Due to the arrangement of 3 / 4 meshes on the roller, the concave meshes formed after the roller treatment on the upper layer of the flannel correspond to the unstamped part of the lower layer. The hydrophobic wool fleece flake layer 1 and the wetting guide wool fleece flake layer 3 are subjected to single-sided single-roller staggered microstructure printing to form convex points on the lower surface of the hydrophobic wool fleece flake layer and the upper surface of the wetting guide wool fleece flake layer respectively; the wet heat conversion acrylic wool fleece flake layer 2 is subjected to double-sided double-roller staggered microstructure printing to form convex points on the upper and lower surfaces of the wet heat conversion acrylic wool fleece flake layer, thereby obtaining a riveted microstructure between the two adjacent layers.

[0041] like Figure 4 As shown, the hydrophobic wool fleece flake layer forms convex points on the lower surface which correspond to the upper surface of the middle layer of moisture-heat conversion acrylic wool fleece flake layer in an alternating manner; similarly, the convex points formed on the upper surface of the moisture-guided wool fleece flake layer correspond to the moisture-heat conversion acrylic wool fleece flake layer in an alternating manner, thereby realizing the riveting microstructure between adjacent layers.

[0042] like Figure 5 , 6 As shown, the hydrophobic wool fiber layer, the heat-wet conversion acrylic wool fiber layer, and the wetting guide wool fiber layer are then laid sequentially in the thickness direction, and then the deviation needling process is used to set the needle angles to 87°, 90°, and 93° in a sequential cycle, with a needling depth of 10mm, a needling density of 40 needles / cm², and a needling speed of 2m / min. The three-layer composite fiber layer is needled, and the concave and convex points formed by the hydrophobic wool flannel layer, the heat-wet conversion acrylic wool flannel layer, and the wetting guide wool flannel layer are riveted to each other, and then deviation needling is performed in the needling mechanism to finally prepare a 360g / m 2 , with a thickness of 10mm double gradient anti-night sweat self-heating wool flannel. Finally, a flannel with three different wetting gradients is formed on the chemical gradient, and a flannel with a porosity gradient is formed in the thickness direction. The moisture is pulled out from bottom to top. The two work together to improve the unidirectional moisture conduction ability of the flannel.

[0043] Example 2 The preparation method of the double-gradient anti-night sweat self-heating wool flannel sheet comprises the following specific steps: The steps of partially descaling wool fiber finishing are as follows: soaking the wool fiber to be treated in a polyoxyethylene-octylphenyl ether solution with a concentration of 0.1% (w / v) at a bath ratio of 1:20, preparing a potassium permanganate solution with a concentration of 3% at a bath ratio of 1:10, and evenly stirring the solution; using a 0.1% (w / v) sodium hydroxide solution to adjust the pH, and the pH range is controlled within 6-7 to reduce damage to the wool; soaking the pretreated wool fiber in the potassium permanganate solution, the temperature is controlled at 30°C, and the setting time is 120min; after treatment, the wool fiber is thoroughly rinsed with clean water to ensure that the residual reagent is completely removed; using a double roller pressing device at a low speed of 10m / min and a roller pressure of 2kg / cm² to press out excess moisture in the fiber; placing the rinsed wool fiber in a drying device, controlling the temperature at 50°C, and drying for 1.5 hours to ensure that the fiber is completely dry, and obtaining partially descaling wool fiber with a diameter of 20μm and a length of 60mm.

[0044] The specific steps of hydrophobic finishing of wool fibers were as follows: partially descaled wool with a diameter of 20 μm and a length of 60 mm was selected as the substrate, HY-31 hydrophobic finishing agent (Dongguan Hongyun Textile Auxiliary Co., Ltd.) was used as the wool hydrophobic treatment agent, and graphene oxide was used as the hydrophobic enhancer.

[0045] The weight of the wool was 200g, and the saturated hydrophilicity of the wool was calculated to be about 583%; the hydrophobic finishing agent was 27.32g; a hydrophobic finishing solution of 610.32 was prepared; graphene oxide was dispersed in deionized water at 0.1%, and an ultrasonic processor was used to fully stir to ensure uniform dispersion; the graphene oxide dispersion was added to the HY-31 hydrophobic finishing agent solution 4 times to ensure that the two were fully mixed, and the ratio of graphene oxide dispersion to hydrophobic finishing solution was 1:3; the wool substrate was completely immersed in the finishing agent, the temperature was set to 15°C, and the time was 120min; a double roller pressing device was used to press the excess water in the fiber at a low speed of 10m / min and a roller pressure of 2kg / cm²; the rinsed wool fiber was placed in a drying device, the temperature was controlled at 50°C, and a low-temperature drying treatment was performed for 1.5 hours to obtain a weight of 160g / m 2 , hydrophobic wool flannel with a thickness of 4mm.

[0046] Weigh 80 g of wool fiber with a diameter of 20 μm and a length of 55 mm and 20 g of WARMWINTER fiber with a diameter of 10 μm and a length of 50 mm (produced by Shanghai Qiwei Textile Technology Co., Ltd.) and mix them evenly to prepare a 100 g / m 2 , a 3mm thick wet heat conversion acrylic wool flannel layer.

[0047] The specific steps of hydrophilic finishing of wool fiber are as follows: select partially descaled wool with a diameter of 20 μm and a length of 60 mm as the substrate, select SS-64 hydrophilic finishing agent (produced by Dongguan Silicon Soft Biotechnology Co., Ltd.) as the wool hydrophilic treatment reagent, and polyvinyl alcohol (PVA) as the reinforcing agent; weigh the partially descaled wool to weigh 100 g, set the bath ratio to 1:6, prepare 10 g / L hydrophilic finishing agent solution, disperse polyvinyl alcohol in deionized water at 10% to form a polyvinyl alcohol solution, mix the polyvinyl alcohol solution with the hydrophilic finishing agent solution, and the ratio of the polyvinyl alcohol solution to the hydrophilic finishing agent solution is C2. For example, the ratio is 1:1, and the mixed solution is evenly stirred to form 1030g; the wool substrate is completely immersed in the mixed solution, the temperature is set to 30°C, and the time is 10min; the wool sample is taken out, and the excess water in the fiber is pressed with a double roller pressing device at a low speed of 10m / min and a roller pressure of 2kg / cm²; the wool sample is placed at a temperature of 70°C for curing for 30min to ensure that the polyvinyl alcohol and the hydrophilic finishing agent are fully combined; the cured wool fiber is placed in a drying device, the temperature is controlled at 30°C, and low-temperature drying is performed for 2 hours to obtain a weight of 50g / m 2 , a moisturizing guiding wool flannel layer with a thickness of 1.5 mm.

[0048] Preparation of double-gradient anti-night sweat self-heating wool flannel: First, hydrophilic wool fiber group, hygroscopic heat-generating acrylic wool fiber group, and hydrophobic wool fiber group are opened by an opener to obtain obvious fiber bundles, and then the opened fiber bundles are sent to a carding machine for carding. After the fiber bundles are carded into a single fiber state, they are input into an air-laying machine for air-laying to form a fiber net with three-dimensional random arrangement of fibers. Then, the fiber net is passed through a staggered microstructure printing roller structure with a length of 120 cm and a diameter of 25 cm, and with different numbers of square convex surfaces (5 cm × 5 cm × 1 cm) and stamping and heating meshes on the surface. When the flannel passes through, the stamping and heating meshes on the roller contact the flannel. Under the dual action of high temperature and air pressure, the surface of the flannel is stamped to form a concave microstructure. After stamping, the flannel forms a concave-convex microstructure. Due to the arrangement of 3 / 4 meshes on the roller, the concave meshes formed after the roller treatment on the upper layer of the flannel correspond to the unstamped part of the lower layer. The hydrophobic wool fleece flake layer 1 and the wetting guide wool fleece flake layer 3 are subjected to single-sided single-roller staggered microstructure printing to form convex points on the lower surface of the hydrophobic wool fleece flake layer and the upper surface of the wetting guide wool fleece flake layer respectively; the wet heat conversion acrylic wool fleece flake layer 2 is subjected to double-sided double-roller staggered microstructure printing to form convex points on the upper and lower surfaces of the wet heat conversion acrylic wool fleece flake layer, thereby obtaining a riveted microstructure between the two adjacent layers.

[0049] like Figure 4As shown, the hydrophobic wool fleece flake layer forms convex points on the lower surface which correspond to the upper surface of the middle layer of moisture-heat conversion acrylic wool fleece flake layer in an alternating manner; similarly, the convex points formed on the upper surface of the moisture-guided wool fleece flake layer correspond to the moisture-heat conversion acrylic wool fleece flake layer in an alternating manner, thereby realizing the riveting microstructure between adjacent layers.

[0050] like Figure 5 , 6 As shown, the hydrophobic wool fiber layer, the heat-wet conversion acrylic wool fiber layer, and the wetting guide wool fiber layer are then laid sequentially in the thickness direction, and then the deviation needling process is used to set the needle angles to 88°, 90°, and 94° in a sequential cycle, with a needling depth of 20mm, a needling density of 70 needles / cm², and a needling speed of 3m / min. The three-layer composite fiber layer is needled, and the concave and convex points formed by the hydrophobic wool flannel layer, the heat-wet conversion acrylic wool flannel layer, and the wetting guide wool flannel layer are riveted to each other, and then deviation cycle needling is performed in the needling mechanism, and finally a gram weight of 315g / m 2 , 8mm thick double gradient anti-night sweat self-heating wool flannel.

[0051] Example 3 The preparation method of the double-gradient anti-night sweat self-heating wool flannel sheet comprises the following specific steps: The finishing steps of partially descaling wool fiber are as follows: soaking the wool fiber to be treated in a polyoxyethylene-octylphenyl ether solution with a concentration of 0.3% (w / v) at a bath ratio of 1:15, and preparing a sodium hypochlorite solution with a concentration of 4% at a bath ratio of 1:8 and stirring the solution evenly; using 0.5% (w / v) sodium hydroxide solution to adjust the pH, and the pH range is controlled within 6-7 to reduce damage to the wool; soaking the pretreated wool fiber in the sodium hypochlorite solution, the temperature is controlled at 60°C, and the setting time is 90min; after treatment, the wool fiber is thoroughly rinsed with clean water to ensure that the residual reagent is completely removed; using a double roller pressing device at a low speed of 30m / min and a roller pressure of 5kg / cm² to press out excess moisture in the fiber; placing the rinsed wool fiber in a drying device, controlling the temperature at 40°C, and drying for 2 hours to ensure that the fiber is completely dry, to obtain partially descaling wool fiber with a diameter of 8μm and a length of 20mm.

[0052] The specific steps of hydrophobic finishing of wool fibers are as follows: partially descaled wool with a diameter of 8 μm and a length of 20 mm is selected as the substrate, HY-31 hydrophobic finishing agent (produced by Dongguan Hongyun Textile Auxiliary Co., Ltd.) is used as the wool hydrophobic treatment agent, and graphene oxide is used as the hydrophobic enhancer.

[0053] The weight of wool was 200 g, and the saturated hydrophilicity of wool was calculated to be about 583%. The hydrophobic finishing agent was 27.32 g. The hydrophobic finishing solution was 610.32 g. Graphene oxide was dispersed in deionized water at 0.5%, and an ultrasonic processor was used to fully stir to ensure uniform dispersion. The graphene oxide dispersion was added to the HY-31 hydrophobic finishing agent solution 4 times to ensure that the two were fully mixed. The ratio of graphene oxide dispersion to hydrophobic finishing solution was 1:2. The wool substrate was completely immersed in the finishing agent, and the temperature was set to 20°C for 90 minutes. The double roller pressing device was used at 30 m / min low speed, roller pressure 5kg / cm² to press the excess water in the fiber; put the rinsed wool fiber into the drying equipment, control the temperature at 40°C, and carry out low-temperature drying for 2 hours to obtain a gram weight of 120g / m 2 , hydrophobic wool flannel with a thickness of 2mm.

[0054] Weigh 120g of wool fiber with a diameter of 10μm and a length of 20mm and 80g of WARMWINTER fiber with a diameter of 20μm and a length of 60mm and mix them evenly to prepare a 80g / m 2 , a 2mm thick wet heat conversion acrylic wool flannel layer.

[0055] The specific steps of hydrophilic finishing of wool fiber are as follows: select partially descaled wool with a diameter of 8 μm and a length of 20 mm as the substrate, select SS-64 hydrophilic finishing agent as the wool hydrophilic treatment reagent, and polyvinyl alcohol (PVA) as the reinforcing agent; weigh the partially descaled wool to be 100 g, set the bath ratio to 1:4, prepare 15 g / L hydrophilic finishing agent solution, disperse polyvinyl alcohol in deionized water at 5% to form a polyvinyl alcohol solution, mix the polyvinyl alcohol solution with the hydrophilic finishing agent solution, and the ratio of the polyvinyl alcohol solution to the hydrophilic finishing agent solution C2 is 1:0.8, and stir evenly. The mixed solution was uniformly prepared into 1030g; the wool substrate was completely immersed in the mixed solution, the temperature was set at 15°C, and the time was 30min; the wool sample was taken out, and the excess water in the fiber was pressed with a double roller pressing device at a low speed of 30m / min and a roller pressure of 5kg / cm²; the wool sample was placed at 60°C for curing treatment for 50min to ensure that the polyvinyl alcohol and the hydrophilic finishing agent were fully combined; the cured wool fiber was placed in a drying device, the temperature was controlled at 40°C, and low-temperature drying was performed for 1.5 hours to obtain a weight of 40g / m 2 , a moisturizing guiding wool flannel layer with a thickness of 1 mm.

[0056] Preparation of double-gradient anti-night sweat self-heating wool flannel: First, hydrophilic wool fiber group, hygroscopic heat-generating acrylic wool fiber group, and hydrophobic wool fiber group are opened by an opener to obtain obvious fiber bundles, and then the opened fiber bundles are sent to a carding machine for carding. After the fiber bundles are carded into a single fiber state, they are input into an air-laying machine for air-laying to form a fiber net with three-dimensional random arrangement of fibers. Then, the fiber net is passed through a staggered microstructure printing roller structure with a length of 110 cm and a diameter of 25 cm, and with different numbers of square convex surfaces (5 cm × 5 cm × 1 cm) and stamping and heating meshes on the surface. When the flannel passes through, the stamping and heating meshes on the roller contact the flannel, and under the dual action of high temperature and air pressure, the surface of the flannel is stamped to form a concave microstructure. After stamping, the flannel forms a concave-convex microstructure. Due to the arrangement of 3 / 4 meshes on the roller, the concave meshes formed after the roller treatment on the upper layer of the flannel correspond to the unstamped part of the lower layer. The hydrophobic wool fleece flake layer 1 and the wetting guide wool fleece flake layer 3 are subjected to single-sided single-roller staggered microstructure printing to form convex points on the lower surface of the hydrophobic wool fleece flake layer and the upper surface of the wetting guide wool fleece flake layer respectively; the wet heat conversion acrylic wool fleece flake layer 2 is subjected to double-sided double-roller staggered microstructure printing to form convex points on the upper and lower surfaces of the wet heat conversion acrylic wool fleece flake layer, thereby obtaining a riveted microstructure between the two adjacent layers.

[0057] like Figure 4 As shown, the hydrophobic wool fleece flake layer forms convex points on the lower surface which correspond to the upper surface of the middle layer of moisture-heat conversion acrylic wool fleece flake layer in an alternating manner; similarly, the convex points formed on the upper surface of the moisture-guided wool fleece flake layer correspond to the moisture-heat conversion acrylic wool fleece flake layer in an alternating manner, thereby realizing the riveting microstructure between adjacent layers.

[0058] like Figure 5 , 6 As shown, the hydrophobic wool fiber layer, the heat-wet conversion acrylic wool fiber layer, and the wetting guide wool fiber layer are then laid sequentially in the thickness direction, and then the needle angles are set to 86°, 90°, and 92° in a sequential cycle through the deviation needling process, the needling depth is 30mm, the needling density is 50 needles / cm², and the needling speed is 5m / min. The three-layer composite fiber layer is needled, and the concave and convex points formed by the hydrophobic wool flannel layer, the heat-wet conversion acrylic wool flannel layer, and the wetting guide wool flannel layer are riveted to each other, and then the deviation cycle needling is performed in the needling mechanism, and finally a gram weight of 300g / m 2 , 4mm thick double gradient anti-night sweat self-heating wool flannel.

[0059] Example 4 The selected materials and preparation methods are the same as those in Example 1, except that the oxidation pretreatment solution selected in this example for partial descaling of wool is a 5% hydrogen peroxide solution.

[0060] Example 5 The selected materials and preparation methods are the same as those in Example 1, except that the weights of the hydrophobic wool flannel layer, the heat-wet conversion acrylic wool flannel layer and the wetting-guiding wool flannel layer are 40 g / m 2 , 30g / m 2 , 20g / m 2 .

[0061] Example 6 The selected materials and preparation methods are the same as those in Example 1, except that the weights of the hydrophobic wool flannel layer, the heat-wet conversion acrylic wool flannel layer and the wetting-guiding wool flannel layer are 170 g / m 2 , 110g / m 2 , 55g / m 2 .

Claims

1. Double gradient anti-night sweat self-heating wool flannel, characterized in that: The invention is formed by stacking a water-repellent wool flannel layer (1), a moisture-heat conversion acrylic wool flannel layer (2) and a moisture-guiding wool flannel layer (3) in sequence and compounding them by needle-punching using a deviation needle-punching method; in terms of total mass percentage, the water-repellent wool flannel layer (1) is 40%-60%, the moisture-heat conversion acrylic wool flannel layer (2) is 30-40%, and the moisture-guiding wool flannel layer (3) is 10-30%, and the ratio between the three layers decreases layer by layer from the water-repellent wool flannel layer (1) to the moisture-guiding wool flannel layer (3) by 60%-10%; The hydrophobic wool flannel layer (1) forms convex points on the lower surface after single-sided roller staggered microstructure printing, the wetting guide wool flannel layer (3) forms convex points on the upper surface after single-sided roller staggered microstructure printing, and the wet heat conversion acrylic wool flannel layer (2) forms convex points on both sides after double-sided double roller staggered microstructure printing, the convex points on the lower surface of the hydrophobic wool flannel layer (1) correspond to the convex points on the upper surface of the wet heat conversion acrylic wool flannel layer (2) in an alternating manner; the convex points on the upper surface of the wetting guide wool flannel layer (3) correspond to the convex points on the lower surface of the wet heat conversion acrylic wool flannel layer (2) in an alternating manner.

2. The double-gradient anti-night sweat self-heating wool flannel sheet according to claim 1, characterized in that: The hydrophobic wool flannel layer (1) has a gram weight of 120-180 g / m² and a thickness of 2-6 mm; the hydrophobic wool flannel layer (1) is obtained by hydrophobic finishing wool fibers with a diameter of 8-30 μm and a length of 20-60 mm with a hydrophobic finishing agent having a purity of greater than or equal to 99%.

3. The double-gradient anti-night sweat self-heating wool flannel sheet according to claim 1, characterized in that: The wet heat conversion acrylic wool flannel layer (2) has a gram weight of 80-120 g / m 2 , with a thickness of 2-5 mm; the moisture-heat conversion acrylic wool flannel flake layer (2) is formed by uniformly mixing wool fibers and hygroscopic heat-generating fibers, wherein, by mass percentage, the wool fibers are 60%-80%, and the hygroscopic heat-generating fibers are 20%-40%. The wool fibers have a diameter of 8-30 μm and a length of 20-60 mm, and the hygroscopic heat-generating fibers are hygroscopic heat-generating polyacrylonitrile fibers with a diameter of 10-20 μm and a length of 30-60 mm.

4. The double-gradient anti-night sweat self-heating wool flannel sheet according to claim 1, characterized in that: The wetting guide wool flannel layer (3) has a gram weight of 40-60 g / m² and a thickness of 1-4 mm. The wetting guide wool flannel layer (3) is obtained by hydrophilically finishing wool fibers with a diameter of 8-30 μm and a length of 20-60 mm with a hydrophilic softener having a concentration of greater than or equal to 30%.

5. The double-gradient anti-night sweat self-heating wool flannel sheet according to claim 1, characterized in that: The staggered microstructure printing roller has a length of 100-120cm and a diameter of 20-25cm. A plurality of square convex rows are arranged in sequence on the surface of the staggered microstructure printing roller, and the plurality of square convex rows are arranged in an N / N+1 cycle, wherein N≥3. A porous mesh is arranged on the square convex surface, wherein the size of each square convex surface is 5cm×5cm×1cm. An electric heating wire heating element is arranged inside the staggered microstructure printing roller, and the temperature is 100-150°C and the pressure strength is 1-2MPa.

6. The method for preparing the double-gradient anti-night sweat self-heating wool flannel sheet as claimed in any one of claims 1 to 5, characterized in that: The specific steps are as follows: S1, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and performing hydrophobic finishing to obtain a hydrophobic wool flake layer; S2, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and moisture-absorbing heat-generating polyacrylonitrile fibers with a diameter of 10-20 μm and a length of 30-60 mm, and mixing the two evenly to obtain a moisture-heat conversion acrylic wool flannel layer; S3, selecting wool fibers with a diameter of 8-30 μm and a length of 20-60 mm and performing hydrophilic finishing to obtain a wet-guided wool flake layer; S4. The fibers of each flocculent layer are loosened and laid, and then subjected to staggered microstructure printing roller treatment, so that the concave structure formed by the lower surface of the hydrophobic wool flocculent layer and the upper surface of the moisture-heat conversion acrylic wool flocculent layer are staggered, and the concave structure of the upper surface of the wet-guide wool flocculent layer and the lower surface of the moisture-heat conversion acrylic wool flocculent layer are staggered. Finally, the three-layer fiber layer is composited by the deviation needle punching process to obtain a double-gradient anti-night sweat self-heating wool flocculent.

7. The method for preparing the double-gradient anti-night sweat self-heating wool flannel sheet according to claim 6, characterized in that: The wool fibers used in S1 and S3 need to be partially descaled in advance. The specific method for partially descaling the wool fibers is as follows: Step 1, soaking the wool fiber to be treated in a polyoxyethylene-octylphenyl ether solution with a concentration of 0.1%-0.5% and a bath ratio of 1:10-20 to obtain pretreated wool fiber; Step 2, preparing an oxidation pretreatment solution: preparing an oxidation pretreatment solution with a concentration of 3%-5% according to a bath ratio of 1:5-10 and stirring evenly, wherein the oxidizing agent in the oxidation pretreatment solution is sodium bromate, potassium permanganate, sodium hypochlorite or hydrogen peroxide; Step 3, using a sodium hydroxide solution with a concentration of 0.1%-1% to adjust the pH value of the oxidation pretreatment solution to control the pH value of the oxidation pretreatment solution to 6-7; Step 4, soaking the pretreated wool fiber in an oxidative pretreatment solution at a temperature between 30 and 60° C. for a treatment time of 30 min, 60 min, 90 min or 120 min; Step 5, cleaning and drying: rinse the treated wool fiber with clean water to remove residual reagents, and then use a double roller pressing device to press out excess water in the fiber, wherein the processing rate is 10-30m / min, and the roller pressure is 2-5kg / cm². Finally, put the rinsed wool fiber into a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C to obtain partially descaled wool fiber.

8. The method for preparing the double-gradient anti-night sweat self-heating wool flannel sheet according to claim 6, characterized in that: The specific steps of performing hydrophobic finishing on the wool fibers in S1 are as follows: S1.1, respectively selecting some descaling wool fibers, a hydrophobic finishing agent and graphene oxide; S1.2, weigh the weight of partially descaled wool fiber as A1, calculate the hydrophilicity of wool as B1%; then the amount of hydrophobic finishing agent C1=(A1+A1* B1%)*4%; prepare the amount of hydrophobic finishing solution D1=C1+ A1* B1%; disperse graphene oxide in deionized water, stir thoroughly with an ultrasonic processor to obtain a graphene oxide dispersion with a concentration of 0.1-1.0%, add the graphene oxide dispersion into the hydrophobic finishing agent D1 solution four times, and the ratio of the graphene oxide dispersion to the hydrophobic finishing solution D1 is 1:1~3; S1.3, partially descaled wool fibers are used as substrates and completely immersed in the hydrophobic finishing agent D1 at a treatment temperature of 15-30°C for 30-120 min; S1.

4. Use a double roller pressing device to press the wool fiber after hydrophobic treatment to remove excess water at a rate of 10-30m / min, and the roller pressure is 2-5kg / cm²; then put the wool fiber into a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C to obtain a hydrophobic wool flake layer.

9. The method for preparing the double-gradient anti-night sweat self-heating wool flannel sheet according to claim 6, characterized in that: The specific steps of performing hydrophilic finishing on the wool fibers in S3 are as follows: S3.1, respectively selecting partially descaled wool, a hydrophilic finishing agent and polyvinyl alcohol; S3.2, weigh a portion of descaled wool fiber with a weight of A2, a hydrophilic finishing agent with a weight of B2, a bath ratio of 1:X, wherein X ranges from 4 to 10, and prepare a hydrophilic finishing agent solution C2 of Yg / L according to the bath ratio, wherein Y ranges from 20 to 40; disperse polyvinyl alcohol in deionized water at a concentration of Z%, wherein Z ranges from 1 to 10; mix the polyvinyl alcohol solution with the hydrophilic finishing agent solution C2, stir evenly and prepare a mixed solution D2=0.001 A2X*(1+Y+Z), wherein the ratio of the polyvinyl alcohol solution to the hydrophilic finishing agent solution C2 is 1:0.5~1; S3.3, completely immersing the partially descaled wool fibers in the hydrophilic finishing agent D2 for treatment at a temperature of 15-30°C for 10-30 minutes; S3.

4. Use a double roller pressing device to press the excess water from the hydrophilic treated wool fiber at a rate of 10-30m / min, and the roller pressure is 2-5kg / cm²; then place the wool fiber at a temperature of 40-70°C for curing for 30-60min; finally, place the cured wool fiber in a drying device and dry it for 1-2 hours at a drying temperature of 30-50°C.

10. The method for preparing the double-gradient anti-night sweat self-heating wool flannel sheet according to claim 6, characterized in that: The specific method of S4: S4.1, opening the hydrophilic wool fiber group, the hygroscopic and heat-generating acrylic wool fiber group, and the hydrophobic wool fiber group respectively by an opening machine to obtain loose fibers; S4.2, firstly combing the loose hydrophilic wool fiber bundle, the hygroscopic and heat-generating acrylic fiber bundle and the hydrophobic fiber bundle respectively by a carding machine, and then air-laying the fibers by an air-laying machine to obtain a hydrophilic fiber web, a hygroscopic and heat-generating fiber web and a hydrophobic fiber web respectively; S4.3, passing the unneedled flakes after laying through the web through an interlaced microstructure printing roller to form an N / N+1 sequential concave structure, so that the concave structure formed by the lower surface of the hydrophobic wool flake layer and the upper surface of the wet heat conversion acrylic wool flake layer are interlaced, and the concave structure formed by the upper surface of the wet guide wool flake layer and the lower surface of the wet heat conversion acrylic wool flake layer are interlaced; S4.

4. Using a deviation-type needling process to compound three fiber layers, during the needling process of the three flake layers, the needling angle changes in a deviation-type manner, from 90° perpendicular to the flake direction to 85°-90°, and then to 90°-95° ​​to form a needling angle change cycle, that is, the needling angle changes in the order of 90°, 85°-90°, and 90°-95°; During the acupuncture process, the acupuncture depth is controlled to be 10-30 mm, the acupuncture density is controlled to be 40-70 needles / cm², and the acupuncture speed is controlled to be 1-5 m / min to obtain a double-gradient anti-night sweat self-heating wool flannel flake.

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