Preparation process of light heat-storage warm-keeping layered fabric

Abstract

The invention provides a preparation process of a light heat storage warm-keeping layered fabric, which comprises the following steps: S1, taking polyester chips and a polyion liquid coated silver doped graphene / PCM composite material as raw materials, and preparing light heat storage fibers through a melt spinning method; s2, light heat storage fibers and cotton fibers are blended, and light heat storage blended yarn is prepared; s3, weaving the light heat storage blended yarns to obtain a light heat storage woven fabric; the light heat storage woven fabric is subjected to after-finishing, and a light heat storage layer is obtained; s4, performing hot-pressing compounding on the windproof layer and the light heat storage layer by adopting a dotted hot melt adhesive, and then performing hot-pressing compounding on one side, far away from the windproof layer, of the compounded fabric and the skin-friendly layer by adopting a dotted hot melt adhesive to prepare the light heat storage warm-keeping layered fabric; the compatibility between the light heat storage agent adopted by the light heat storage layer and the polyester is high, and the light heat storage performance is good, so that the whole light heat storage warm-keeping layered fabric has excellent warm-keeping performance.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, and in particular to a preparation process of a light-heat-storage and warm-keeping layered fabric. Background Art

[0002] Photothermal thermal insulation fabrics are high-tech textiles that combine photothermal conversion and thermal energy storage. They absorb light energy (such as sunlight or infrared rays) and convert it into heat, simultaneously storing and releasing heat. As high-performance textiles, they have broad application prospects in technical fields such as clothing and home textiles. In particular, as clothing materials, they provide efficient thermal insulation and enhance wearer comfort, while also reducing energy consumption and adapting to a variety of winter activities and scenarios.

[0003] Compared to traditional thermal insulation materials, solar thermal insulation fabrics are typically lighter, thinner, and softer, without adding weight or restricting mobility. For example, when applied to garments like down jackets, since solar thermal insulation fabrics already offer excellent thermal insulation, they can facilitate the design of thinner and lighter down jackets while maintaining this performance while further enhancing their aesthetics. As technology advances, solar thermal insulation fabrics will play an increasingly important role in winter clothing.

[0004] Although the photothermal storage performance of photothermal thermal insulation fabrics has made significant progress, there are still some limitations in practical applications. For example, the compatibility between photothermal storage agents and spinning raw materials and the photothermal storage performance of the photothermal storage agents themselves need to be further improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation process of a light-heat-storage thermal insulation layered fabric. The light-heat-storage agent used in preparing the light-heat-storage layer has high compatibility with polyester and good light-heat-storage performance, so that the light-heat-storage thermal insulation layered fabric as a whole has excellent thermal insulation performance.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A preparation process of a light-storage heat-insulating layered fabric comprises the following steps: S1. Using polyester chips and polyionic liquid-coated silver-doped graphene / PCM composite materials as raw materials, a light-storage thermal fiber was prepared by melt spinning; S2. Blending light-heat storage fiber and cotton fiber to prepare light-heat storage blended yarn; S3, weaving a light-heat-storage woven fabric using a light-heat-storage blended yarn; and finishing the light-heat-storage woven fabric to obtain a light-heat-storage layer; S4. Use dot-shaped hot melt adhesive to hot-press the windproof layer and the solar heat storage layer, and then use dot-shaped hot melt adhesive to hot-press the side of the composite fabric away from the windproof layer and the skin-friendly layer to prepare a solar heat storage and thermal insulation layered fabric; the solar heat storage and thermal insulation layered fabric includes, from the outside to the inside, a windproof layer, a solar heat storage layer and a skin-friendly layer.

[0007] Preferably, in step S1, the mass ratio of the ester slices to the polyionic liquid-coated silver-doped graphene / PCM composite material is 100:2.8-3.6.

[0008] Preferably, the preparation method of the polyionic liquid-coated silver-doped graphene / PCM composite material comprises the following steps: (1) Preparation of silver-doped graphene; (2) After the silver-doped graphene is immersed in a petroleum ether solution of a phase change material, the solution is filtered, and the resulting material is vacuum-dried to remove the petroleum ether, thereby obtaining a silver-doped graphene / PCM composite material; the phase change material is n-hexadecane or n-octadecane; (3) The silver-doped graphene / PCM composite material was placed in N,N-dimethylformamide and ultrasonically dispersed to obtain a silver-doped graphene / PCM composite material dispersion with a concentration of 10~20 mg / mL; then, under a nitrogen atmosphere, ionic liquid, crosslinking agent, and initiator were added to the silver-doped graphene / PCM composite material dispersion in sequence, and then the temperature was raised to 70~75℃ for reaction for 15~25h; after the reaction stopped, the dispersion was filtered and vacuum dried to obtain a polyionic liquid-coated silver-doped graphene / PCM composite material.

[0009] Preferably, in step (1), the method for preparing silver-doped graphene comprises the following steps: Graphene was added to deionized water and ultrasonicated at a power of 500-1000 W for 1-3 h to obtain a graphene aqueous dispersion with a concentration of 30-60 mg / mL. Adding silver nitrate aqueous solution to the graphene aqueous dispersion, ultrasonically treating for 20 to 40 minutes, then adding ammonium bicarbonate, and ultrasonically treating for another 20 to 40 minutes, transferring the resulting dispersion to a hydrothermal reaction, heating to 190 to 205° C. for a hydrothermal reaction for 8 to 10 hours, then cooling to room temperature, filtering, and vacuum drying to obtain the silver-doped graphene; The particle size of the graphene is 300-600 nm, the mass fraction of the silver nitrate aqueous solution is 10-15%, and the mass ratio of the graphene aqueous dispersion, the silver nitrate aqueous solution, and the ammonium bicarbonate is 100:2-3:0.45-0.55.

[0010] Preferably, in step (2), the mass fraction of the phase change material in the petroleum ether solution of the phase change material is 30-35%; and the immersion time is 60-90 min.

[0011] Preferably, in step (3), the ionic liquid is 1-vinyl 3-ethyl imidazolium bromide ionic liquid, the crosslinking agent is ethylene glycol dimethacrylate, and the initiator is one of benzoyl dimethylcarbamate, benzoyl peroxide, tert-butylbenzene peroxide, and azobisisobutyronitrile; The amount of the ionic liquid added is 10 to 15 times the mass of the silver-doped graphene / PCM composite material; the mass ratio of the ionic liquid, the crosslinking agent, and the initiator is 10 to 20: 3.5 to 5: 0.3 to 0.5.

[0012] Preferably, step S1 includes the following steps: mixing polyester chips with polyionic liquid-coated silver-doped graphene / PCM composite materials, melt-blending and extruding granulation using a twin-screw extruder, and then melt-spinning, and then cooling by annular air blowing, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fibers.

[0013] Preferably, step S2 specifically includes the following steps: weighing the light-heat storage fiber and cotton fiber according to the ratio, wherein the mass ratio of the light-heat storage fiber and the cotton fiber is 60~70:30~40; then performing the cotton cleaning, carding, combing, and drawing processes, and then sequentially performing the roving, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

[0014] Preferably, the post-finishing includes singeing, scouring, bleaching, dyeing and shaping.

[0015] Preferably, the windproof layer is made of polyester fiber fabric, and the weight of the polyester fiber fabric is 200-240g / m 2 The weight of the light heat storage layer is 160~190g / m 2 The skin-friendly layer is made of cotton fiber fabric or modal fabric, and the weight of the skin-friendly layer is 120~160g / m 2 .

[0016] The beneficial effects of the present invention are: The present invention uses a polyionic liquid-coated silver-doped graphene / PCM composite material as the photothermal storage agent. Graphene, the primary substrate, possesses excellent light absorption capabilities within the visible and near-infrared ranges and converts light energy into heat. This heat is then stored by the phase-change material (PCM) n-hexadecane or n-octadecane. The combination of graphene and the PCM effectively enhances heat storage and release efficiency. Silver-doping the graphene further enhances its light absorption capacity and broadens its photothermal conversion efficiency, while also enhancing the antibacterial properties of the photothermal storage layer.

[0017] The present invention further uses polyionic liquid to coat the silver-doped graphene / PCM composite material. Through the polyionic liquid coating, the dispersibility of graphene in polyester and the compatibility between graphene and polyester can be effectively improved, and the structural stability of the silver-doped graphene / PCM composite material can be significantly enhanced, so that the prepared solar thermal storage layer has more lasting and efficient heat storage and heat preservation performance, and can enhance the efficiency of heat energy storage and release.

[0018] The present invention uses a light heat storage layer as the main fabric layer of the light heat storage and thermal insulation layered fabric, which can give the light heat storage and thermal insulation layered fabric excellent light heat storage and thermal insulation performance. At the same time, a windproof layer and a skin-friendly layer are respectively arranged on both sides of the light heat storage layer, which can enhance the thermal insulation performance and enable the light heat storage and thermal insulation layered fabric to maintain a high wearing comfort. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] In order to solve the problems in the prior art, the present invention specifically discloses a preparation process of a light-heat-storage warm-keeping layered fabric, comprising the following steps: S1. Using polyester chips and polyionic liquid-coated silver-doped graphene / PCM composite materials as raw materials, a light-storage thermal fiber was prepared by melt spinning; S2. Blending light-heat storage fiber and cotton fiber to prepare light-heat storage blended yarn; S3, weaving a light-heat-storage woven fabric using a light-heat-storage blended yarn; and finishing the light-heat-storage woven fabric to obtain a light-heat-storage layer; S4. The windproof layer and the solar heat storage layer are hot-pressed with point-shaped hot melt adhesive, and then the side of the composite fabric away from the windproof layer and the skin-friendly layer are hot-pressed with point-shaped hot melt adhesive to prepare a solar heat storage and thermal insulation layered fabric; the solar heat storage and thermal insulation layered fabric includes, from the outside to the inside, a windproof layer, a solar heat storage layer and a skin-friendly layer.

[0021] In some embodiments, in step S1, the mass ratio of the ester slices to the polyionic liquid-coated silver-doped graphene / PCM composite material is 100:2.8-3.6.

[0022] In some embodiments, the preparation method of the polyionic liquid-coated silver-doped graphene / PCM composite material comprises the following steps: (1) Preparation of silver-doped graphene; (2) After the silver-doped graphene is immersed in a petroleum ether solution of a phase change material, the solution is filtered, and the resulting material is vacuum-dried to remove the petroleum ether, thereby obtaining a silver-doped graphene / PCM composite material; the phase change material is n-hexadecane or n-octadecane; (3) The silver-doped graphene / PCM composite material was placed in N,N-dimethylformamide and ultrasonically dispersed to obtain a silver-doped graphene / PCM composite material dispersion with a concentration of 10~20 mg / mL; then, under a nitrogen atmosphere, ionic liquid, crosslinking agent, and initiator were added to the silver-doped graphene / PCM composite material dispersion in sequence, and then the temperature was raised to 70~75℃ for reaction for 15~25h; after the reaction stopped, the dispersion was filtered and vacuum dried to obtain a polyionic liquid-coated silver-doped graphene / PCM composite material.

[0023] In some embodiments, in step (1), the method for preparing silver-doped graphene includes the following steps: Graphene was added to deionized water and ultrasonicated at a power of 500-1000 W for 1-3 h to obtain a graphene aqueous dispersion with a concentration of 30-60 mg / mL. Adding silver nitrate aqueous solution to the graphene aqueous dispersion, ultrasonically treating for 20 to 40 minutes, then adding ammonium bicarbonate, and ultrasonically treating for another 20 to 40 minutes, transferring the resulting dispersion to a hydrothermal reaction, heating to 190 to 205° C. for a hydrothermal reaction for 8 to 10 hours, then cooling to room temperature, filtering, and vacuum drying to obtain the silver-doped graphene; The particle size of the graphene is 300-600 nm, the mass fraction of the silver nitrate aqueous solution is 10-15%, and the mass ratio of the graphene aqueous dispersion, the silver nitrate aqueous solution, and the ammonium bicarbonate is 100:2-3:0.45-0.55.

[0024] In some embodiments, in step (2), the mass fraction of the phase change material in the petroleum ether solution of the phase change material is 30-35%; and the immersion time is 60-90 minutes.

[0025] In some embodiments, in step (3), the ionic liquid is 1-vinyl 3-ethyl imidazolium bromide ionic liquid, the crosslinking agent is ethylene glycol dimethacrylate, and the initiator is one of benzoyl dimethylcarbamate, benzoyl peroxide, tert-butylbenzene peroxide, and azobisisobutyronitrile; The amount of the ionic liquid added is 10 to 15 times the mass of the silver-doped graphene / PCM composite material; the mass ratio of the ionic liquid, the crosslinking agent, and the initiator is 10 to 20: 3.5 to 5: 0.3 to 0.5.

[0026] In some embodiments, step S1 includes the following steps: mixing polyester chips with polyionic liquid-coated silver-doped graphene / PCM composite materials, melt-blending and extruding granulation using a twin-screw extruder, and then melt-spinning, and then cooling by annular air blowing, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fibers.

[0027] In some embodiments, step S2 specifically includes the following steps: weighing the light-heat storage fiber and cotton fiber according to the ratio, wherein the mass ratio of the light-heat storage fiber and the cotton fiber is 60~70:30~40; then performing the cotton cleaning, carding, combing, and drawing processes, and then sequentially performing the coarse yarn, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

[0028] In some embodiments, post-finishing includes singeing, scouring, bleaching, dyeing, and setting.

[0029] In some embodiments, the windproof layer is a polyester fiber fabric having a gram weight of 200-240 g / m 2 The weight of the light heat storage layer is 160~190g / m 2 The skin-friendly layer is made of cotton fiber fabric or modal fabric, and the weight of the skin-friendly layer is 120~160g / m 2 .

[0030] The following are specific embodiments: Example 1: A preparation process of a light-storage heat-insulating layered fabric comprises the following steps: S1. Polyester chips with a mass ratio of 100:3.0 were mixed with polyionic liquid-coated silver-doped graphene / PCM composite materials, and melt-blended and extruded into granules using a twin-screw extruder. The mixture was then melt-spun, and then subjected to ring-blown cooling, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fibers.

[0031] S2. Weigh the light-heat storage fiber and cotton fiber according to the ratio, and the mass ratio of the light-heat storage fiber and cotton fiber is 65:35; then carry out the cotton cleaning, carding, combing, and drawing processes, and then sequentially go through the roving, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

[0032] S3. Weaving a light-heat-storage blended yarn to obtain a light-heat-storage woven fabric (plain weave structure); subjecting the light-heat-storage woven fabric to post-finishing to obtain a light-heat-storage layer; the post-finishing includes singeing, bleaching, dyeing, and shaping.

[0033] S4. The windproof layer and the light heat storage layer are hot-pressed with a dot hot melt adhesive, and then the side of the composite fabric away from the windproof layer and the skin-friendly layer are hot-pressed with a dot hot melt adhesive to prepare a light heat storage and thermal insulation layered fabric; the light heat storage and thermal insulation layered fabric includes a windproof layer, a light heat storage layer and a skin-friendly layer from the outside to the inside; the windproof layer is a polyester fiber fabric with a gram weight of 230g / m 2 ;The weight of the light heat storage layer is 160g / m 2 The skin-friendly layer is made of cotton fiber fabric with a gram weight of 130g / m 2 .

[0034] The preparation method of the polyionic liquid-coated silver-doped graphene / PCM composite material in this embodiment includes the following steps: (1) Preparation of silver-doped graphene: Graphene was added to deionized water and ultrasonicated at a power of 800 W for 2 h to obtain a graphene aqueous dispersion with a concentration of 50 mg / mL. Adding silver nitrate aqueous solution to the graphene aqueous dispersion, ultrasonically treating for 30 minutes, then adding ammonium bicarbonate, and then ultrasonically treating for another 30 minutes, transferring the resulting dispersion to a hydrothermal reaction, heating to 200° C. for hydrothermal reaction for 10 hours, then cooling to room temperature, filtering, and vacuum drying to obtain the silver-doped graphene; Among them, the particle size of graphene is 300~600nm, the mass fraction of silver nitrate aqueous solution is 12%, and the mass ratio of graphene aqueous dispersion, silver nitrate aqueous solution and ammonium bicarbonate is 100:3:0.5.

[0035] (2) The silver-doped graphene was immersed in a petroleum ether solution of n-hexadecane for 90 minutes, filtered, and the obtained material was vacuum-dried to remove the petroleum ether to obtain a silver-doped graphene / PCM composite material; wherein the mass fraction of n-hexadecane in the petroleum ether solution of n-hexadecane was 35%.

[0036] (3) The silver-doped graphene / PCM composite material was placed in N,N-dimethylformamide and ultrasonically dispersed to obtain a silver-doped graphene / PCM composite material dispersion with a concentration of 15 mg / mL; then, under a nitrogen atmosphere, 1-vinyl 3-ethylimidazolium bromide ionic liquid, ethylene glycol dimethacrylate, and azobisisobutyronitrile were added to the silver-doped graphene / PCM composite material dispersion in sequence, and then the temperature was raised to 75°C for reaction for 20 hours; after the reaction stopped, the mixture was filtered and vacuum dried to obtain a polyionic liquid-coated silver-doped graphene / PCM composite material; Among them, the added amount of 1-vinyl 3-ethyl imidazolium bromide ionic liquid is 12 times the mass of the silver-doped graphene / PCM composite material; the mass ratio of 1-vinyl 3-ethyl imidazolium bromide ionic liquid, ethylene glycol dimethacrylate, and azobisisobutyronitrile is 15:4.5:0.45.

[0037] Example 2: A preparation process of a light-storage heat-insulating layered fabric comprises the following steps: S1. Polyester chips with a mass ratio of 100:2.8 were mixed with polyionic liquid-coated silver-doped graphene / PCM composite materials, and melt-blended and extruded into granules using a twin-screw extruder. The mixture was then melt-spun, and then subjected to ring-blown cooling, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fibers.

[0038] S2. Weigh the light-heat storage fiber and cotton fiber according to the ratio, with the mass ratio of the light-heat storage fiber to the cotton fiber being 70:30; then carry out the cotton cleaning, carding, combing, and drawing processes, and then sequentially carry out the roving, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

[0039] S3. Weaving a light-heat-storage blended yarn to obtain a light-heat-storage woven fabric (plain weave structure); subjecting the light-heat-storage woven fabric to post-finishing to obtain a light-heat-storage layer; the post-finishing includes singeing, bleaching, dyeing, and shaping.

[0040] S4. The windproof layer and the light heat storage layer are hot-pressed with a dot hot melt adhesive, and then the side of the composite fabric away from the windproof layer and the skin-friendly layer are hot-pressed with a dot hot melt adhesive to prepare a light heat storage and thermal insulation layered fabric; the light heat storage and thermal insulation layered fabric includes a windproof layer, a light heat storage layer and a skin-friendly layer from the outside to the inside; the windproof layer is a polyester fiber fabric with a gram weight of 230g / m 2 ;The weight of the light heat storage layer is 190g / m 2 The skin-friendly layer is made of cotton fiber fabric with a gram weight of 130g / m 2 .

[0041] The preparation method of the polyionic liquid-coated silver-doped graphene / PCM composite material in this embodiment includes the following steps: (1) Preparation of silver-doped graphene: Graphene was added to deionized water and ultrasonicated at a power of 800 W for 3 h to obtain a graphene aqueous dispersion with a concentration of 45 mg / mL. Adding silver nitrate aqueous solution to the graphene aqueous dispersion, ultrasonically treating for 40 minutes, then adding ammonium bicarbonate, and then ultrasonically treating for another 40 minutes, transferring the resulting dispersion to a hydrothermal reaction, heating to 195° C. for hydrothermal reaction for 9 hours, then cooling to room temperature, filtering, and vacuum drying to obtain the silver-doped graphene; Among them, the particle size of graphene is 300~600nm, the mass fraction of silver nitrate aqueous solution is 15%, and the mass ratio of graphene aqueous dispersion, silver nitrate aqueous solution and ammonium bicarbonate is 100:3:0.45.

[0042] (2) The silver-doped graphene was immersed in a petroleum ether solution of n-hexadecane for 70 minutes, filtered, and the obtained material was vacuum-dried to remove the petroleum ether to obtain a silver-doped graphene / PCM composite material; wherein the mass fraction of n-hexadecane in the petroleum ether solution of n-hexadecane was 30%.

[0043] (3) The silver-doped graphene / PCM composite material was placed in N,N-dimethylformamide and ultrasonically dispersed to obtain a silver-doped graphene / PCM composite material dispersion with a concentration of 20 mg / mL; then, under a nitrogen atmosphere, 1-vinyl 3-ethylimidazolium bromide ionic liquid, ethylene glycol dimethacrylate, and azobisisobutyronitrile were added to the silver-doped graphene / PCM composite material dispersion in sequence, and then the temperature was raised to 70°C for reaction for 25 hours; after the reaction stopped, the mixture was filtered and vacuum dried to obtain a polyionic liquid-coated silver-doped graphene / PCM composite material; Among them, the added amount of 1-vinyl 3-ethyl imidazolium bromide ionic liquid is 10 times the mass of the silver-doped graphene / PCM composite material; the mass ratio of 1-vinyl 3-ethyl imidazolium bromide ionic liquid, ethylene glycol dimethacrylate, and azobisisobutyronitrile is 15:3.5:0.3.

[0044] Example 3: A preparation process of a light-storage heat-insulating layered fabric comprises the following steps: S1. After mixing polyester chips with a mass ratio of 100:3.6 and polyionic liquid-coated silver-doped graphene / PCM composite material (prepared by the method in Example 2), a twin-screw extruder is used for melt blending and extrusion granulation, followed by melt spinning, and then ring blowing cooling, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fiber.

[0045] S2. Weigh the light-heat storage fiber and cotton fiber according to the ratio, and the mass ratio of the light-heat storage fiber and the cotton fiber is 60:40; then carry out the cotton cleaning, carding, combing, and drawing processes, and then sequentially go through the roving, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

[0046] S3. Weaving a light-heat-storage blended yarn to obtain a light-heat-storage woven fabric (plain weave structure); subjecting the light-heat-storage woven fabric to post-finishing to obtain a light-heat-storage layer; the post-finishing includes singeing, bleaching, dyeing, and shaping.

[0047] S4. The windproof layer and the light heat storage layer are hot-pressed with a dot hot melt adhesive, and then the side of the composite fabric away from the windproof layer and the skin-friendly layer are hot-pressed with a dot hot melt adhesive to prepare a light heat storage and thermal insulation layered fabric; the light heat storage and thermal insulation layered fabric includes a windproof layer, a light heat storage layer and a skin-friendly layer from the outside to the inside; the windproof layer is a polyester fiber fabric with a gram weight of 230g / m 2 ;The weight of the light heat storage layer is 170g / m 2 The skin-friendly layer is made of cotton fiber fabric with a gram weight of 130g / m 2 .

[0048] Example 4: A preparation process of a light-storage heat-insulating layered fabric comprises the following steps: S1. After mixing polyester chips with a mass ratio of 100:3.2 and polyionic liquid-coated silver-doped graphene / PCM composite materials (prepared by the method in Example 1), a twin-screw extruder is used for melt blending and extrusion granulation, followed by melt spinning, and then ring blowing cooling, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fibers.

[0049] S2. Weigh the light-heat storage fiber and cotton fiber according to the ratio, and the mass ratio of the light-heat storage fiber and cotton fiber is 63:37; then carry out the cotton cleaning, carding, combing, and drawing processes, and then sequentially go through the roving, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

[0050] S3. Weaving a light-heat-storage blended yarn to obtain a light-heat-storage woven fabric (plain weave structure); subjecting the light-heat-storage woven fabric to post-finishing to obtain a light-heat-storage layer; the post-finishing includes singeing, bleaching, dyeing, and shaping.

[0051] S4. The windproof layer and the light heat storage layer are hot-pressed with a dot hot melt adhesive, and then the side of the composite fabric away from the windproof layer and the skin-friendly layer are hot-pressed with a dot hot melt adhesive to prepare a light heat storage and thermal insulation layered fabric; the light heat storage and thermal insulation layered fabric includes a windproof layer, a light heat storage layer and a skin-friendly layer from the outside to the inside; the windproof layer is a polyester fiber fabric with a gram weight of 230g / m 2 ;The weight of the light heat storage layer is 170g / m 2 The skin-friendly layer is made of cotton fiber fabric, and the weight of the skin-friendly layer is 130g / m 2 .

[0052] Comparative Example 1: The difference from Example 1 is that when preparing the light-heat storage fiber, the polyionic liquid-coated silver-doped graphene / PCM composite material is replaced by a polyionic liquid-coated graphene / PCM composite material; the remaining steps are basically the same as in Example 1.

[0053] The preparation method of the polyionic liquid-coated graphene / PCM composite material comprises the following steps: (1) Graphene (particle size of 300-600 nm) was immersed in a petroleum ether solution of n-hexadecane for 90 min, filtered, and the obtained material was vacuum dried to remove the petroleum ether to obtain a graphene / PCM composite material; wherein the mass fraction of n-hexadecane in the petroleum ether solution was 35%.

[0054] (2) The graphene / PCM composite material was placed in N,N-dimethylformamide and ultrasonically dispersed to obtain a graphene dispersion with a concentration of 15 mg / mL; then, 1-vinyl 3-ethylimidazolium bromide ionic liquid, ethylene glycol dimethacrylate, and azobisisobutyronitrile were added to the graphene dispersion in sequence under a nitrogen atmosphere, and then the temperature was raised to 75°C for reaction for 20 hours; after the reaction stopped, the mixture was filtered and vacuum dried to obtain a polyionic liquid-coated graphene / PCM composite material; Among them, the added amount of 1-vinyl 3-ethyl imidazolium bromide ionic liquid is 12 times the mass of the silver-doped graphene / PCM composite material; the mass ratio of 1-vinyl 3-ethyl imidazolium bromide ionic liquid, ethylene glycol dimethacrylate, and azobisisobutyronitrile is 15:4.5:0.45.

[0055] Comparative Example 2: The difference from Example 1 is that when preparing the light-heat storage fiber, the polyionic liquid-coated silver-doped graphene / PCM composite material is replaced by the silver-doped graphene / PCM composite material prepared by the method in Example 1; the remaining steps are basically the same as in Example 1.

[0056] Comparative Example 3: The difference from Example 1 is that when preparing the light-heat storage fiber, the polyionic liquid-coated silver-doped graphene / PCM composite material is replaced by the graphene / PCM composite material; the remaining steps are basically the same as in Example 1.

[0057] The preparation method of the graphene / PCM composite material comprises the following steps: Graphene (particle size 300-600 nm) was immersed in a petroleum ether solution of n-hexadecane for 90 minutes, filtered, and vacuum dried to remove the petroleum ether, thereby obtaining a graphene / PCM composite material; wherein the mass fraction of n-hexadecane in the petroleum ether solution was 35%.

[0058] Performance testing: The solar thermal storage layers in the examples and comparative examples were tested for their solar thermal storage performance according to the method specified in GB / T 18319-2019, measuring their maximum and average temperature rises. The layers were cleaned 10 times and then tested again for their solar thermal storage performance according to the method specified in GB / T 18319-2019, measuring their maximum and average temperature rises. The specific test results are shown in Table 1.

[0059] Table 1 Test results of the solar thermal storage performance of the solar thermal storage layer

[0060] As can be seen from Table 1, the light-heat storage layer prepared by the process of Examples 1 to 4 has excellent light-heat storage performance, which can give the light-heat storage thermal insulation layered fabric excellent thermal insulation performance. After washing 10 times, the light-heat storage layer still has a high light-heat storage performance. It can be seen that the polyionic liquid-coated silver-doped graphene / PCM composite material not only has excellent light-heat storage performance, but also has a stable structure. As can be seen from Example 1 and Comparative Example 1, when preparing the light-heat storage agent polyionic liquid-coated silver-doped graphene / PCM composite material, the use of silver doping can significantly improve the light-heat storage effect. As can be seen from Example 1 and Comparative Example 2, when preparing the light-heat storage agent polyionic liquid-coated silver-doped graphene / PCM composite material, the use of polyionic liquid coating is beneficial to the overall improvement of the light-heat storage effect and can enable the light-heat storage agent to maintain stable light-heat storage performance in the light-heat storage fiber for a long time. It can be seen from Example 1 and Comparative Example 2 that when preparing the light-heat storage agent, if silver doping and polyionic liquid coating are not performed, the light-heat storage performance of the obtained light-heat storage agent will be significantly reduced, and the stability in the light-heat storage fiber will be poor.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A preparation process of a light-heat-storage warm-keeping layered fabric, characterized in that: The following steps are involved: S1. Using polyester chips and polyionic liquid-coated silver-doped graphene / PCM composite materials as raw materials, a light-storage thermal fiber was prepared by melt spinning; S2. Blending light-heat storage fiber and cotton fiber to prepare light-heat storage blended yarn; S3, weaving a light-heat-storage woven fabric using a light-heat-storage blended yarn; and finishing the light-heat-storage woven fabric to obtain a light-heat-storage layer; S4. Use dot-shaped hot melt adhesive to hot-press the windproof layer and the solar heat storage layer, and then use dot-shaped hot melt adhesive to hot-press the side of the composite fabric away from the windproof layer and the skin-friendly layer to prepare a solar heat storage and thermal insulation layered fabric; the solar heat storage and thermal insulation layered fabric includes, from the outside to the inside, a windproof layer, a solar heat storage layer and a skin-friendly layer.

2. The process for preparing the light-heat-storage warm-keeping layered fabric according to claim 1, characterized in that: In step S1, the mass ratio of the ester slices to the polyionic liquid-coated silver-doped graphene / PCM composite material is 100:2.8-3.

6.

3. The preparation process of the light-heat-storage warm-keeping layered fabric according to claim 1, characterized in that: The preparation method of the polyionic liquid-coated silver-doped graphene / PCM composite material comprises the following steps: (1) Preparation of silver-doped graphene; (2) After the silver-doped graphene is immersed in a petroleum ether solution of a phase change material, the solution is filtered, and the resulting material is vacuum-dried to remove the petroleum ether, thereby obtaining a silver-doped graphene / PCM composite material; the phase change material is n-hexadecane or n-octadecane; (3) The silver-doped graphene / PCM composite material was placed in N,N-dimethylformamide and ultrasonically dispersed to obtain a silver-doped graphene / PCM composite material dispersion with a concentration of 10~20 mg / mL; then, under a nitrogen atmosphere, ionic liquid, crosslinking agent, and initiator were added to the silver-doped graphene / PCM composite material dispersion in sequence, and then the temperature was raised to 70~75℃ for reaction for 15~25h; after the reaction stopped, the dispersion was filtered and vacuum dried to obtain a polyionic liquid-coated silver-doped graphene / PCM composite material.

4. The process for preparing the light-heat-storage warm-keeping layered fabric according to claim 3, characterized in that: In step (1), the method for preparing silver-doped graphene comprises the following steps: Graphene was added to deionized water and ultrasonicated at a power of 500-1000 W for 1-3 h to obtain a graphene aqueous dispersion with a concentration of 30-60 mg / mL. Adding silver nitrate aqueous solution to the graphene aqueous dispersion, ultrasonically treating for 20 to 40 minutes, then adding ammonium bicarbonate, and ultrasonically treating for another 20 to 40 minutes, transferring the resulting dispersion to a hydrothermal reaction, heating to 190 to 205° C. for a hydrothermal reaction for 8 to 10 hours, then cooling to room temperature, filtering, and vacuum drying to obtain the silver-doped graphene; The particle size of the graphene is 300-600 nm, the mass fraction of the silver nitrate aqueous solution is 10-15%, and the mass ratio of the graphene aqueous dispersion, the silver nitrate aqueous solution, and the ammonium bicarbonate is 100:2-3:0.45-0.

55.

5. The process for preparing the light-heat-storage warm-keeping layered fabric according to claim 3, characterized in that: In step (2), the mass fraction of the phase change material in the petroleum ether solution of the phase change material is 30-35%; and the immersion time is 60-90 minutes.

6. The process for preparing the light-heat-storage warm-keeping layered fabric according to claim 3, characterized in that: In step (3), the ionic liquid is 1-vinyl 3-ethyl imidazolium bromide ionic liquid, the crosslinking agent is ethylene glycol dimethacrylate, and the initiator is one of benzoyl dimethylcarbamate, benzoyl peroxide, tert-butylbenzene peroxide, and azobisisobutyronitrile; The amount of the ionic liquid added is 10 to 15 times the mass of the silver-doped graphene / PCM composite material; the mass ratio of the ionic liquid, the crosslinking agent, and the initiator is 10 to 20: 3.5 to 5: 0.3 to 0.

5.

7. The process for preparing the light-heat-storage warm-keeping layered fabric according to any one of claims 1 to 6, characterized in that: Step S1 includes the following steps: mixing polyester chips with polyionic liquid-coated silver-doped graphene / PCM composite materials, melt-blending and extruding granulation using a twin-screw extruder, then melt-spinning, and then cooling by annular air blowing, winding, bundling, drawing, tension heat setting, curling, oiling, relaxation heat setting, and cutting to obtain light-heat storage fibers.

8. The process for preparing the light-heat-storage warm-keeping layered fabric according to any one of claims 1 to 6, characterized in that: Step S2 specifically includes the following steps: weighing the light-heat storage fiber and cotton fiber according to the ratio, wherein the mass ratio of the light-heat storage fiber to the cotton fiber is 60~70:30~40; then performing the cotton cleaning, carding, combing, and drawing processes, and then sequentially performing the roving, spun yarn, winding, and twisting processes to obtain the light-heat storage blended yarn.

9. The process for preparing the light-heat-storage warm-keeping layered fabric according to any one of claims 1 to 6, characterized in that: The post-finishing process includes singeing, scouring, bleaching, dyeing and shaping.

10. The process for preparing the light-heat-storage warm-keeping layered fabric according to any one of claims 1 to 6, characterized in that: The windproof layer is made of polyester fiber fabric, and the weight of the polyester fiber fabric is 200~240g / m 2 The weight of the light heat storage layer is 160~190g / m 2 The skin-friendly layer is made of cotton fiber fabric or modal fabric, and the weight of the skin-friendly layer is 120~160g / m 2 .

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