Temperature-control chenille fabric and preparation method thereof

Abstract

The invention relates to the technical field of functional textile materials, in particular to a temperature-control chenille fabric and a preparation method thereof. According to the invention, a three-layer composite structure with a vertical gradient functional zone is constructed, wherein a close-fitting one-way moisture conducting layer is formed by special-shaped section terylene; a lower-layer polypropylene fiber network and an upper-layer moisture-absorbing heating fiber are compounded through a knitted structure to form an intelligent response layer, so that spatial isolation between a sweat path and a heating path is realized; and the outer layer is a heat preservation tufting layer formed by blending hollow solid-solid phase change fibers and polyester filament yarns. According to the method, moisture absorption heating and rapid perspiration can be triggered under different conditions, stable buffering of solid-solid phase change is matched, the intelligent synergistic effect of rapid moisture guiding evaporative cooling during sweating and active heating and moisturizing during drying and low temperature is achieved, and the dynamic heat and humidity comfort is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of functional textile materials technology, and in particular to a temperature-controlled chenille fabric and its preparation method. Background Technology

[0002] Traditional chenille fabrics primarily rely on their fluffy pile structure to trap still air for passive insulation. This static and singular method of heat regulation means that such fabrics cannot cope with the complex thermal and moisture loads caused by physical activity, changes in ambient temperature, and perspiration. When the body sweats, the sweat is easily absorbed by the pile or trapped inside the fabric, resulting in a sticky feeling and significantly reducing its insulating properties, failing to maintain a comfortable microclimate. To improve the comfort of chenille fabrics, existing technologies typically employ two approaches: one is to apply temperature-regulating materials, such as phase change microcapsules, to the pile through finishing processes or incorporate them into the fibers through blending and spinning to give the fabric temperature buffering capabilities; the other is to introduce moisture-absorbing and heat-generating fibers or moisture-wicking fibers into the fabric structure to improve its thermal and moisture comfort.

[0003] However, existing technologies that simply physical blend or layer functional materials, such as mixing moisture-absorbing and heat-generating fibers with phase change materials in the same structural layer, can lead to the simultaneous and disordered triggering of multiple mechanisms when the body sweats. The heat generated by moisture absorption and heat generation conflicts with the need for cooling through perspiration, and the heat storage behavior of phase change materials may also hinder necessary heat dissipation, causing confusion in the thermal and moisture management logic and even exacerbating the feeling of stuffiness. Secondly, the layering of functional layers can easily lead to obstructed sweat transport paths from the inner to the outer layers, causing sweat to accumulate internally. At the same time, conventional phase change microcapsule finishing technology has the risk of microcapsule core material leakage and insufficient durability. Therefore, a temperature-controlled chenille fabric with a reasonable thermal and moisture management mechanism, good perspiration efficiency, and good functional durability is needed. Summary of the Invention

[0004] This invention proposes a temperature-controlled chenille fabric and its preparation method, aiming to solve the problems of conflicting heat and moisture management mechanisms, low perspiration efficiency, and poor functional durability in existing technologies. The invention constructs a three-layer composite structure with vertically gradient functional zones: a close-fitting one-way moisture-wicking layer composed of irregularly shaped cross-section polyester; a smart response layer composed of a lower polypropylene fiber network and an upper moisture-absorbing and heat-generating fiber layer through a knitted structure, achieving spatial isolation between the sweat path and the heat-generating path; and an outer layer of heat-insulating tufted fabric blended from hollow solid-solid phase change fibers and polyester filaments. This method enables moisture absorption and heat generation, along with rapid perspiration wicking, to be triggered under different conditions. Combined with the stable buffering of the solid-solid phase change, it achieves a smart synergistic effect of rapid moisture evaporation and cooling during sweating, and active heat generation and moisturizing during dry, low-temperature conditions, significantly improving dynamic thermal and moisture comfort.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a temperature-controlled chenille fabric, which consists of a one-way moisture-wicking layer, a smart response layer, and a thermal insulation tufted layer from bottom to top; wherein the one-way moisture-wicking layer is composed of polyester filaments with irregular cross sections, the smart response layer is composed of a lower polypropylene fiber network and an upper moisture-absorbing and heat-generating fiber through a knitted structure, and the thermal insulation tufted layer is composed of hollow solid-solid phase change fibers and polyester filaments blended together.

[0006] A method for preparing a temperature-controlled chenille fabric includes the following steps: Step S1: Using a double needle bed warp knitting machine, the lower layer chain knitting structure uses polypropylene filaments with a profiled cross section and the yarn tension is controlled at 3.5 cN, the upper layer weft-inserting structure uses moisture-absorbing and heat-generating yarns and the yarn tension is controlled at 4.5 cN, the upper and lower layers are connected by polyester monofilaments with a 2 mm interval in a loop structure, the knitting speed is 450 rpm, and then it is set in 120℃ steam for 45 s to obtain the intelligent response layer base fabric;

[0007] Step S2: Using a 28-needle single-sided weft knitting circular knitting machine, polyester filaments with irregular cross-sections are knitted. The inner surface has plain knitting, and the outer surface has a tucked raised structure. The loop length is 2.9 mm / needle, which produces a unidirectional moisture-wicking base fabric. The tucked surface of the unidirectional moisture-wicking base fabric is then hot-melt bonded to the polypropylene surface of the smart response layer base fabric. The bonding temperature is 125℃, the bonding pressure is 0.4 MPa, and the bonding time is 25 s. The adhesive dots are distributed in a grid pattern with a diameter of 0.8 mm and a center-to-center spacing of 5 mm, thus producing a composite base fabric.

[0008] Step S3: Polyester filament and hollow solid-solid phase change fiber are twisted together at a mass ratio of 7:3, with a twist of 600 twists / m to obtain tufting yarn. Tufting is performed on the composite base fabric using a tufting machine, with a tufting density of 7 needles / inch and a tufting height of 3mm. The tufting position is on the braided structure of the smart response layer base fabric. Then, it is set under 115℃ steam for 5 minutes to obtain temperature-controlled chenille fabric.

[0009] The moisture-absorbing and heat-generating fiber is prepared by the following steps:

[0010] Step A1: Mix enzymatically hydrolyzed lignin, calcium chloride and dimethyl sulfoxide, under nitrogen protection, at a stirring speed of 300-400 rpm, at room temperature, stir and add acrylonitrile copolymer, stir for 15-20 min, then add hydrogen peroxide solution, heat to 70℃, react for 6-8 h, precipitate with hydrochloric acid solution, filter, wash with deionized water, dry, and obtain grafted polyacrylonitrile.

[0011] Furthermore, in step A1, the ratio of enzymatic hydrolysis of lignin, calcium chloride, dimethyl sulfoxide, acrylonitrile copolymer, and hydrogen peroxide solution is 4.8-5g: 2.2-2.5g: 70-80mL: 14-15g: 2.5-3mL, and the volume fraction of hydrogen peroxide solution is 30%.

[0012] Step A2: Mix microcrystalline cellulose and N,N-dimethylacetamide at a stirring speed of 300-400 rpm and a temperature of 150°C for 40-60 min. Cool down to 60°C, stir and add lithium chloride solution, stir for 15-20 min, then add polyacrylonitrile and grafted polyacrylonitrile, heat to 80°C and stir for 10-12 h to obtain a moisture-absorbing and heat-generating fiber spinning solution.

[0013] Furthermore, in step A2, the ratio of microcrystalline cellulose, N,N-dimethylacetamide, lithium chloride solution, polyacrylonitrile, and grafted polyacrylonitrile is 0.18-0.2g: 15-18mL: 1.4-1.5mL: 2.65-2.7g: 0.25-0.3g, and the mass fraction of lithium chloride solution is 8%.

[0014] Step A3: Using a wet spinning process, the moisture-absorbing and heat-generating fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.4 mm and a spinning rate of 0.25 mL / s. Methanol at 5°C is used as the coagulation bath, and the coagulation time is 30 min. Then, the fiber is stretched in a water bath at 90°C with a stretching ratio of 12 times to obtain the moisture-absorbing and heat-generating fiber.

[0015] The hollow solid-solid phase change fiber is prepared by the following steps:

[0016] Step B1: Mix polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer and N,N-dimethylformamide, stir at a stirring speed of 300-400 rpm and a temperature of 60°C for 4-6 hours, cool, and obtain phase change fiber spinning solution.

[0017] Furthermore, in step B1, the ratio of polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer, and N,N-dimethylformamide is 2.3-2.5g: 7.2-7.5g: 0.35-0.4g: 50-60mL.

[0018] Step B2: Using a wet spinning process, the phase change fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.6 mm and a spinning rate of 0.4 mL / s. A mixture of N,N-dimethylformamide and deionized water at 25 °C is used as the coagulation bath for 30 min. Then, the fiber is stretched in a water bath at 80 °C with a stretching ratio of 5 times to obtain hollow solid-solid phase change fibers.

[0019] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention constructs a three-layer composite structure with vertical gradient functional partitions: a close-fitting one-way moisture-wicking layer composed of irregularly shaped cross-section polyester; a smart response layer composed of a lower polypropylene fiber network and an upper moisture-absorbing and heat-generating fiber through a knitted structure, achieving spatial isolation between the sweat path and the heat-generating path; and an outer layer of thermal insulation tufted fabric blended from hollow solid-solid phase change fibers and polyester filaments. This method enables moisture absorption and heat generation, as well as rapid perspiration, to be triggered under different conditions. Combined with the stable buffering of solid-solid phase change, it achieves a smart synergistic effect of rapid moisture evaporation and cooling during sweating, and active heat generation and moisturizing during dry and low-temperature conditions, significantly improving dynamic thermal and humidity comfort.

[0020] This invention employs an enzymatic lignin-grafted polyacrylonitrile and microcrystalline cellulose composite spinning method, combined with multiple hydrophilic group adsorption and rigid network support mechanisms, to solve the problems of limited moisture absorption, low heat generation intensity, and easy softening under humid and hot conditions in traditional moisture-absorbing and heat-generating fibers. Enzymatically hydrolyzed lignin is rich in phenolic hydroxyl groups, which, when grafted onto the polyacrylonitrile chain, introduce a large number of hydrophilic sites, significantly improving the fiber's adsorption capacity and binding energy for gaseous water molecules, thereby generating higher adsorption heat. Microcrystalline cellulose forms an interpenetrating rigid network in the spinning solution, which, when combined with the polyacrylonitrile matrix, greatly improves the fiber's modulus retention rate after moisture absorption, avoids fabric structural collapse due to swelling, and ensures the stability and durability of the heat generation function.

[0021] This invention employs a wet spinning process using polyethylene glycol / polyacrylonitrile blends and a phase separation-based pore-forming method, combined with a mechanism for controlling the incompatibility of polymer blends and the solvent exchange rate. This solves the problem of simultaneously achieving high thermal storage density and morphological stability in solid-solid phase change fibers. Polyethylene glycol serves as the phase change component, while polyacrylonitrile and acrylonitrile copolymers act as the matrix. The two components exhibit thermodynamic incompatibility in the blend spinning solution. By controlling the composition and temperature of the coagulation bath, macroscopic phase separation and shrinkage of the polyethylene glycol phase are induced within the fiber, while the polyacrylonitrile phase rapidly solidifies and solidifies, thus forming a stable hollow structure in situ. This hollow structure not only encapsulates the phase change material, preventing its migration during use, but the still air within the hollow cavity also provides additional insulation, achieving integrated heat storage and heat preservation.

[0022] This invention employs a warp-knitted interleaved structure to three-dimensionally composite the lower polypropylene network with the upper moisture-absorbing and heat-generating fibers. Combined with a vertical spatial isolation mechanism between the sweat transmission path and the air contact surface, it solves the problem of the moisture-absorbing and heat-generating function being mistakenly triggered and exacerbating stuffiness under sweating conditions. Through double-needle bed warp knitting technology, the hydrophobic and moisture-wicking polypropylene network and the moisture-absorbing and heat-generating fibers are respectively constructed in the upper and lower layers of the interleaved fabric, supported by polyester monofilament pillars in the middle. This structure allows liquid sweat from the skin to be rapidly diffused laterally by the lower polypropylene network and transported to the root of the pile. Its transmission path is physically restricted to the lower space, preventing it from making extensive contact with the upper moisture-absorbing and heat-generating fibers. The upper moisture-absorbing and heat-generating fibers are mainly exposed to the flowing air between the piles, only absorbing gaseous moisture from the environment, thus achieving precise separation of the functional triggering conditions.

[0023] This invention employs a Y-shaped cross-section polyester filament weaving technique to create a heterogeneous structure between the inner and outer layers. Combined with the differential pumping mechanism of the fiber's irregular grooves and the fabric structure, it solves the problem of slow initial diffusion of sweat in the inner layer. The Y-shaped cross-section polyester filament has continuous grooves on its surface, which can generate strong capillary force. By weaving it into a structure with a smooth inner surface and a raised outer surface, a difference in structure and pores is created between the inner and outer surfaces of the fabric. This difference generates differential capillary pressure from the inside to the outside in the fabric thickness direction, which can actively and quickly pump liquid sweat from the skin surface to the outer surface of the fabric, achieving immediate initial diffusion of sweat and laying the foundation for subsequent interlayer transport. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with existing known technologies. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In the following embodiments and comparative examples: the polypropylene filament has a specification of 75D / 144f and a cross-shaped cross section; the polyester monofilament has a specification of 20D; the profiled polyester filament has a specification of 50D / 72f and a Y-shaped cross section; and the polyester filament has a specification of 150D / 288f.

[0026] The acrylonitrile copolymer is a copolymer of acrylonitrile, methyl acrylate and itaconic acid, with Mn=15000, methyl acrylate content of 6%, and itaconic acid mass fraction of 2%; the polyacrylonitrile has Mn=250000; and the polyethylene glycol has Mn=4000.

[0027] Example 1: A temperature-controlled chenille fabric, which consists of a one-way moisture-wicking layer, a smart response layer, and a thermal insulation tufted layer from bottom to top; wherein the one-way moisture-wicking layer is composed of polyester filaments with irregular cross sections, the smart response layer is composed of a lower polypropylene fiber network and an upper moisture-absorbing and heat-generating fiber through a knitted structure, and the thermal insulation tufted layer is composed of hollow solid-solid phase change fibers and polyester filaments blended together.

[0028] A method for preparing a temperature-controlled chenille fabric includes the following steps: Step S1: Using a double needle bed warp knitting machine, the lower layer chain knitting structure uses polypropylene filaments with a profiled cross section and the yarn tension is controlled at 3.5 cN, the upper layer weft-inserting structure uses moisture-absorbing and heat-generating yarns and the yarn tension is controlled at 4.5 cN, the upper and lower layers are connected by polyester monofilaments with a 2 mm interval in a loop structure, the knitting speed is 450 rpm, and then it is set in 120℃ steam for 45 s to obtain the intelligent response layer base fabric;

[0029] Step S2: Using a 28-needle single-sided weft knitting circular knitting machine, polyester filaments with irregular cross-sections are knitted. The inner surface has plain knitting, and the outer surface has a tucked raised structure. The loop length is 2.9 mm / needle, which produces a unidirectional moisture-wicking base fabric. The tucked surface of the unidirectional moisture-wicking base fabric is then hot-melt bonded to the polypropylene surface of the smart response layer base fabric. The bonding temperature is 125℃, the bonding pressure is 0.4 MPa, and the bonding time is 25 s. The adhesive dots are distributed in a grid pattern with a diameter of 0.8 mm and a center-to-center spacing of 5 mm, thus producing a composite base fabric.

[0030] Step S3: Polyester filament and hollow solid-solid phase change fiber are twisted together at a mass ratio of 7:3, with a twist of 600 twists / m to obtain tufting yarn. Tufting is performed on the composite base fabric using a tufting machine, with a tufting density of 7 needles / inch and a tufting height of 3mm. The tufting position is on the braided structure of the smart response layer base fabric. Then, it is set under 115℃ steam for 5 minutes to obtain temperature-controlled chenille fabric.

[0031] The moisture-absorbing and heat-generating fiber is prepared by the following steps:

[0032] Step A1: Mix enzymatically hydrolyzed lignin, calcium chloride and dimethyl sulfoxide, under nitrogen protection, stirring at 300 rpm at room temperature, add acrylonitrile copolymer, stir for 15 min, then add hydrogen peroxide solution, heat to 70℃, react for 6 h, precipitate with hydrochloric acid solution, filter, wash with deionized water, dry, and obtain grafted polyacrylonitrile.

[0033] Furthermore, in step A1, the ratio of enzymatic hydrolysis of lignin, calcium chloride, dimethyl sulfoxide, acrylonitrile copolymer, and hydrogen peroxide solution is 4.8g:2.2g:70mL:14g:2.5mL, and the volume fraction of hydrogen peroxide solution is 30%.

[0034] Step A2: Mix microcrystalline cellulose and N,N-dimethylacetamide, stir at 300 rpm and 150°C for 40 min, cool to 60°C, stir and add lithium chloride solution, stir for 15 min, then add polyacrylonitrile and grafted polyacrylonitrile, heat to 80°C and stir for 10 h to obtain moisture-absorbing and heat-generating fiber spinning solution.

[0035] Furthermore, in step A2, the ratio of microcrystalline cellulose, N,N-dimethylacetamide, lithium chloride solution, polyacrylonitrile, and grafted polyacrylonitrile is 0.18g:15mL:1.4mL:2.65g:0.25g, and the mass fraction of lithium chloride solution is 8%.

[0036] Step A3: Using a wet spinning process, the moisture-absorbing and heat-generating fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.4 mm and a spinning rate of 0.25 mL / s. Methanol at 5°C is used as the coagulation bath, and the coagulation time is 30 min. Then, the fiber is stretched in a water bath at 90°C with a stretching ratio of 12 times to obtain the moisture-absorbing and heat-generating fiber.

[0037] The hollow solid-solid phase change fiber is prepared by the following steps:

[0038] Step B1: Polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer and N,N-dimethylformamide are mixed and stirred for 4 hours at a stirring speed of 400 rpm and a temperature of 60°C. After cooling, a phase change fiber spinning solution is obtained.

[0039] Furthermore, in step B1, the ratio of polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer, and N,N-dimethylformamide is 2.5g:7.2g:0.4g:50mL.

[0040] Step B2: Using a wet spinning process, the phase change fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.6 mm and a spinning rate of 0.4 mL / s. A mixture of N,N-dimethylformamide and deionized water at 25 °C is used as the coagulation bath for 30 min. Then, the fiber is stretched in a water bath at 80 °C with a stretching ratio of 5 times to obtain hollow solid-solid phase change fibers.

[0041] Example 2: A temperature-controlled chenille fabric, which consists of a one-way moisture-wicking layer, a smart response layer, and a thermal insulation tufted layer from bottom to top; wherein the one-way moisture-wicking layer is composed of polyester filaments with irregular cross sections, the smart response layer is composed of a lower polypropylene fiber network and an upper moisture-absorbing and heat-generating fiber through a knitted structure, and the thermal insulation tufted layer is composed of hollow solid-solid phase change fibers and polyester filaments blended together.

[0042] A method for preparing a temperature-controlled chenille fabric includes the following steps: Step S1: Using a double needle bed warp knitting machine, the lower layer chain knitting structure uses polypropylene filaments with a profiled cross section and the yarn tension is controlled at 3.5 cN, the upper layer weft-inserting structure uses moisture-absorbing and heat-generating yarns and the yarn tension is controlled at 4.5 cN, the upper and lower layers are connected by polyester monofilaments with a 2 mm interval in a loop structure, the knitting speed is 450 rpm, and then it is set in 120℃ steam for 45 s to obtain the intelligent response layer base fabric;

[0043] Step S2: Using a 28-needle single-sided weft knitting circular knitting machine, polyester filaments with irregular cross-sections are knitted. The inner surface has plain knitting, and the outer surface has a tucked raised structure. The loop length is 2.9 mm / needle, which produces a unidirectional moisture-wicking base fabric. The tucked surface of the unidirectional moisture-wicking base fabric is then hot-melt bonded to the polypropylene surface of the smart response layer base fabric. The bonding temperature is 125℃, the bonding pressure is 0.4 MPa, and the bonding time is 25 s. The adhesive dots are distributed in a grid pattern with a diameter of 0.8 mm and a center-to-center spacing of 5 mm, thus producing a composite base fabric.

[0044] Step S3: Polyester filament and hollow solid-solid phase change fiber are twisted together at a mass ratio of 7:3, with a twist of 600 twists / m to obtain tufting yarn. Tufting is performed on the composite base fabric using a tufting machine, with a tufting density of 7 needles / inch and a tufting height of 3mm. The tufting position is on the braided structure of the smart response layer base fabric. Then, it is set under 115℃ steam for 5 minutes to obtain temperature-controlled chenille fabric.

[0045] The moisture-absorbing and heat-generating fiber is prepared by the following steps:

[0046] Step A1: Mix enzymatically hydrolyzed lignin, calcium chloride and dimethyl sulfoxide, under nitrogen protection, stirring at 400 rpm at room temperature, stir and add acrylonitrile copolymer, stir for 15 min, then add hydrogen peroxide solution, heat to 70℃, react for 8 h, precipitate with hydrochloric acid solution, filter, wash with deionized water, dry, and obtain grafted polyacrylonitrile.

[0047] Furthermore, in step A1, the ratio of enzymatic hydrolysis of lignin, calcium chloride, dimethyl sulfoxide, acrylonitrile copolymer, and hydrogen peroxide solution is 4.8g:2.2g:80mL:14g:2.5mL, and the volume fraction of hydrogen peroxide solution is 30%.

[0048] Step A2: Mix microcrystalline cellulose and N,N-dimethylacetamide, stir at 300 rpm and 150°C for 60 min, cool to 60°C, stir and add lithium chloride solution, stir for 20 min, then add polyacrylonitrile and grafted polyacrylonitrile, heat to 80°C and stir for 10 h to obtain moisture-absorbing and heat-generating fiber spinning solution.

[0049] Furthermore, in step A2, the ratio of microcrystalline cellulose, N,N-dimethylacetamide, lithium chloride solution, polyacrylonitrile, and grafted polyacrylonitrile is 0.18g:18mL:1.4mL:2.65g:0.3g, and the mass fraction of lithium chloride solution is 8%.

[0050] Step A3: Using a wet spinning process, the moisture-absorbing and heat-generating fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.4 mm and a spinning rate of 0.25 mL / s. Methanol at 5°C is used as the coagulation bath, and the coagulation time is 30 min. Then, the fiber is stretched in a water bath at 90°C with a stretching ratio of 12 times to obtain the moisture-absorbing and heat-generating fiber.

[0051] The hollow solid-solid phase change fiber is prepared by the following steps:

[0052] Step B1: Polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer and N,N-dimethylformamide are mixed and stirred for 4 hours at a stirring speed of 300 rpm and a temperature of 60°C. After cooling, a phase change fiber spinning solution is obtained.

[0053] Furthermore, in step B1, the ratio of polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer, and N,N-dimethylformamide is 2.3g:7.2g:0.35g:50mL.

[0054] Step B2: Using a wet spinning process, the phase change fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.6 mm and a spinning rate of 0.4 mL / s. A mixture of N,N-dimethylformamide and deionized water at 25 °C is used as the coagulation bath for 30 min. Then, the fiber is stretched in a water bath at 80 °C with a stretching ratio of 5 times to obtain hollow solid-solid phase change fibers.

[0055] Example 3: A temperature-controlled chenille fabric, which consists of a one-way moisture-wicking layer, a smart response layer, and a thermal insulation tufted layer from bottom to top; wherein the one-way moisture-wicking layer is composed of polyester filaments with irregular cross sections, the smart response layer is composed of a lower polypropylene fiber network and an upper moisture-absorbing and heat-generating fiber through a knitted structure, and the thermal insulation tufted layer is composed of hollow solid-solid phase change fibers and polyester filaments blended together.

[0056] A method for preparing a temperature-controlled chenille fabric includes the following steps: Step S1: Using a double needle bed warp knitting machine, the lower layer chain knitting structure uses polypropylene filaments with a profiled cross section and the yarn tension is controlled at 3.5 cN, the upper layer weft-inserting structure uses moisture-absorbing and heat-generating yarns and the yarn tension is controlled at 4.5 cN, the upper and lower layers are connected by polyester monofilaments with a 2 mm interval in a loop structure, the knitting speed is 450 rpm, and then it is set in 120℃ steam for 45 s to obtain the intelligent response layer base fabric;

[0057] Step S2: Using a 28-needle single-sided weft knitting circular knitting machine, polyester filaments with irregular cross-sections are knitted. The inner surface has plain knitting, and the outer surface has a tucked raised structure. The loop length is 2.9 mm / needle, which produces a unidirectional moisture-wicking base fabric. The tucked surface of the unidirectional moisture-wicking base fabric is then hot-melt bonded to the polypropylene surface of the smart response layer base fabric. The bonding temperature is 125℃, the bonding pressure is 0.4 MPa, and the bonding time is 25 s. The adhesive dots are distributed in a grid pattern with a diameter of 0.8 mm and a center-to-center spacing of 5 mm, thus producing a composite base fabric.

[0058] Step S3: Polyester filament and hollow solid-solid phase change fiber are twisted together at a mass ratio of 7:3, with a twist of 600 twists / m to obtain tufting yarn. Tufting is performed on the composite base fabric using a tufting machine, with a tufting density of 7 needles / inch and a tufting height of 3mm. The tufting position is on the braided structure of the smart response layer base fabric. Then, it is set under 115℃ steam for 5 minutes to obtain temperature-controlled chenille fabric.

[0059] The moisture-absorbing and heat-generating fiber is prepared by the following steps:

[0060] Step A1: Mix enzymatically hydrolyzed lignin, calcium chloride and dimethyl sulfoxide, under nitrogen protection, stirring at 400 rpm at room temperature, stir and add acrylonitrile copolymer, stir for 20 min, then add hydrogen peroxide solution, heat to 70℃, react for 8 h, precipitate with hydrochloric acid solution, filter, wash with deionized water, dry, and obtain grafted polyacrylonitrile.

[0061] Furthermore, in step A1, the ratio of enzymatic hydrolysis of lignin, calcium chloride, dimethyl sulfoxide, acrylonitrile copolymer, and hydrogen peroxide solution is 5g:2.5g:80mL:15g:3mL, and the volume fraction of hydrogen peroxide solution is 30%.

[0062] Step A2: Mix microcrystalline cellulose and N,N-dimethylacetamide, stir at 400 rpm and 150°C for 60 min, cool to 60°C, stir and add lithium chloride solution, stir for 20 min, then add polyacrylonitrile and grafted polyacrylonitrile, heat to 80°C and stir for 12 h to obtain moisture-absorbing and heat-generating fiber spinning solution.

[0063] Furthermore, in step A2, the ratio of microcrystalline cellulose, N,N-dimethylacetamide, lithium chloride solution, polyacrylonitrile, and grafted polyacrylonitrile is 0.2g:18mL:1.5mL:2.7g:0.3g, and the mass fraction of lithium chloride solution is 8%.

[0064] Step A3: Using a wet spinning process, the moisture-absorbing and heat-generating fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.4 mm and a spinning rate of 0.25 mL / s. Methanol at 5°C is used as the coagulation bath, and the coagulation time is 30 min. Then, the fiber is stretched in a water bath at 90°C with a stretching ratio of 12 times to obtain the moisture-absorbing and heat-generating fiber.

[0065] The hollow solid-solid phase change fiber is prepared by the following steps:

[0066] Step B1: Polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer and N,N-dimethylformamide are mixed and stirred for 6 hours at a stirring speed of 400 rpm and a temperature of 60°C. After cooling, a phase change fiber spinning solution is obtained.

[0067] Furthermore, in step B1, the ratio of polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer, and N,N-dimethylformamide is 2.5g:7.5g:0.4g:60mL.

[0068] Step B2: Using a wet spinning process, the phase change fiber spinning solution is transferred to a spinning device with a spinneret diameter of 0.6 mm and a spinning rate of 0.4 mL / s. A mixture of N,N-dimethylformamide and deionized water at 25 °C is used as the coagulation bath for 30 min. Then, the fiber is stretched in a water bath at 80 °C with a stretching ratio of 5 times to obtain hollow solid-solid phase change fibers.

[0069] Comparative Example 1: Compared with Example 3, in the preparation of moisture-absorbing and heat-generating fibers in Example 3, the microcrystalline cellulose in steps A1 and A2 was omitted, and only an equal amount of polyacrylonitrile was used for conventional wet spinning. The remaining steps were the same as in Example 3.

[0070] Comparative Example 2: Compared with Example 3, in the preparation of hollow solid-solid phase change fiber in Example 3, polyethylene glycol was omitted, and only polyacrylonitrile was used to spin hollow polyester fiber. The remaining steps were the same as in Example 3.

[0071] Comparative Example 3: Compared with Example 3, this comparative example changes the structure of the smart response layer in Example 3. The moisture-absorbing and heat-generating fiber yarn prepared in Example 1 is blended with polypropylene filament at a mass ratio of 1:4 to form a single strand yarn, which is then woven into a single-layer plain knit fabric as the response layer. The remaining steps are the same as in Example 3.

[0072] Temperature-controlled chenille fabrics prepared in Examples 1, 2, 3, Comparative Examples 1, 2, and 3 were cut into 20cm × 20cm samples. The samples were placed on an insulating table with a sensor on the one-way moisture-wicking layer of the fabric. The temperature change was recorded after 10 minutes at 20°C and 65% relative humidity to evaluate its moisture absorption and heat generation performance. Referring to GB / T 21655.2-2019, the one-way moisture-wicking surface was used as the immersion surface to determine its unidirectional heat transfer index. The samples were placed at 45°C and 65% relative humidity for 4 hours, then transferred to a temperature of 15°C and 65% relative humidity. The sensor was placed on the one-way moisture-wicking layer of the fabric, and the insulation time at 32-38°C was measured and recorded every 10 seconds to determine its insulation performance. The samples were washed under the same conditions 30 times, and then their various properties were measured. The test results are shown in the table below.

[0073] Table 1 Test Results

[0074] As shown in the table, comparing Examples 1, 2, and 3 with Comparative Examples 1, 2, and 3, it can be seen from the performance of the examples that their fabrics have good moisture-wicking and temperature-controlling properties, and can absorb moisture and generate heat under humid conditions. Because Comparative Example 1 uses ordinary acrylic fiber instead of moisture-wicking and heat-generating fiber, it lacks the high moisture absorption and rigid support mechanism brought by lignin grafting and microcrystalline cellulose network, resulting in a lack of its active heat-generating ability and thus a decrease in its performance. Because Comparative Example 2 uses hollow fiber instead of hollow solid-solid phase change fiber, it lacks the latent heat storage and release mechanism of phase change material, resulting in a decrease in its heat retention and loss of temperature buffering function. Because Comparative Example 3 blends two functional fibers into a single layer, it lacks the vertical space isolation and sweat path isolation mechanism, the moisture-wicking and heat-generating fiber is activated and interferes with moisture wicking, resulting in a decrease in unidirectional moisture wicking ability and thus affecting its performance.

[0075] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A temperature-controlled fleece fabric, characterized in that: From bottom to top, the temperature-controllable snowball fabric comprises a one-way moisture transfer layer, an intelligent response layer and a thermal insulation tufting layer; the one-way moisture transfer layer is composed of profiled polyester filaments; the intelligent response layer is composed of a network of lower polypropylene fibers and an upper moisture-absorbing and heat-generating fiber through a knitted structure; and the thermal insulation tufting layer is composed of hollow solid-solid phase change fibers and polyester filaments.

2. The preparation method of the temperature-controllable snowball fabric according to claim 1, comprising the following steps: Step S1: using a double-needle bed warp knitting machine, profiled polypropylene filaments are used for the lower chain stitch, and the yarn tension is controlled at 3.5 cN; moisture-absorbing and heat-generating yarns are used for the upper weft insertion stitch, and the yarn tension is controlled at 4.5 cN; the upper and lower layers are connected through a 2mm-spaced polyester monofilament in a loop structure, and the knitting speed is 450 rpm; then the intelligent response layer base fabric is prepared by setting at 120 DEG C steam for 45s; Step S2: using a 28-needle single-side weft knitting circular machine, profiled polyester filaments are used for knitting, the inner surface is plain knitted, and the outer surface is a tuck raised structure with a loop length of 2.9mm / needle; the one-way moisture transfer layer base fabric is prepared; the tuck surface of the one-way moisture transfer layer base fabric and the polypropylene surface of the intelligent response layer base fabric are hot melt compounded at a temperature of 125 DEG C, a pressure of 0.4 MPa and a time of 25s, wherein the glue points are distributed in a grid shape with a diameter of 0.8mm and a center distance of 5mm; the compounded base fabric is prepared; Step S3: using polyester filaments as the hollow solid-solid phase change fibers with a mass ratio of 7:3, the yarns for tufting are prepared by doubling and twisting at a twist of 600 twists / m; the temperature-controllable snowball fabric is prepared by tufting on the compounded base fabric using a tufting machine at a tufting density of 7 needles / inch and a tufting height of 3mm, the tufting position is on the chain stitch of the intelligent response layer base fabric, and then setting at 115 DEG C steam for 5min. The moisture-absorbing and heat-generating fiber is prepared by the following steps: Step A1: mixing enzymatic lignin, calcium chloride and dimethyl sulfoxide, stirring at a stirring speed of 300-400 rpm under nitrogen protection at room temperature, adding acrylonitrile copolymer, stirring for 15-20 min, adding hydrogen peroxide solution, heating to 70 DEG C, reacting for 6-8h, precipitating with hydrochloric acid solution, filtering, washing with deionized water, and drying to obtain grafted polyacrylonitrile; 3. The method for preparing a temperature-controlled chenille fabric according to claim 2, characterized in that: Step A2: mixing microcrystalline cellulose and N,N-dimethylacetamide, stirring at a stirring speed of 300-400 rpm at a temperature of 150 DEG C for 40-60 min, cooling to 60 DEG C, stirring and adding lithium chloride solution, stirring for 15-20 min, adding polyacrylonitrile and grafted polyacrylonitrile, heating to 80 DEG C, stirring for 10-12h to obtain a moisture-absorbing and heat-generating fiber spinning solution; Step A3: using a wet spinning process, transferring the moisture-absorbing and heat-generating fiber spinning solution to a spinning device, using a spinneret with a diameter of 0.4mm and a spinning rate of 0.25mL / s, using methanol with a temperature of 5 DEG C as a coagulation bath with a coagulation time of 30 min, and then stretching in a water bath with a temperature of 90 DEG C at a stretching ratio of 12 times to obtain the moisture-absorbing and heat-generating fiber. ​ ​ 4. The method for preparing a temperature-controlled chenille fabric according to claim 3, characterized in that: In step A1, the amount ratio of enzymatic lignin, calcium chloride, dimethyl sulfoxide, acrylonitrile copolymer and hydrogen peroxide solution is 4.8-5 g: 2.2-2.5 g: 70-80 mL: 14-15 g: 2.5-3 mL, and the volume fraction of hydrogen peroxide solution is 30%.

5. The method for preparing a temperature-controlled chenille fabric according to claim 3, characterized in that: In step A2, the amount ratio of microcrystalline cellulose, N,N-dimethylacetamide, lithium chloride solution, polyacrylonitrile and grafted polyacrylonitrile is 0.18-0.2 g: 15-18 mL: 1.4-1.5 mL: 2.65-2.7 g: 0.25-0.3 g, and the mass fraction of lithium chloride solution is 8%.

6. The method for preparing a temperature-controlled chenille fabric according to claim 2, characterized in that: The hollow solid-solid phase change fiber is prepared by the following steps: In step B1, polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer and N,N-dimethylformamide are mixed, stirred at a stirring rate of 300-400 rpm and a temperature of 60℃ for 4-6 h, and cooled to prepare a phase change fiber spinning solution; In step B2, the phase change fiber spinning solution is transferred to a spinning device by using a wet spinning process, a spinneret with a diameter of 0.6 mm is used, the spinning rate is 0.4 mL / s, a mixture of N,N-dimethylformamide and deionized water with a temperature of 25℃ is used as a coagulation bath, the coagulation time is 30 min, and then stretching is performed in a water bath with a temperature of 80℃, and the stretching ratio is 5 times to prepare a hollow solid-solid phase change fiber.

7. The method for preparing a temperature-controlled chenille fabric according to claim 6, characterized in that: In step B1, the amount ratio of polyethylene glycol, polyacrylonitrile, acrylonitrile copolymer and N,N-dimethylformamide is 2.3-2.5 g: 7.2-7.5 g: 0.35-0.4 g: 50-60 mL.

Images