Hollow heating fabric for warm keeping of winter gown and preparation process of hollow heating fabric

Abstract

The invention relates to the technical field of functional textile materials, in particular to a hollow heating fabric for winter gown warm keeping and a preparation process thereof.The hollow heating fabric comprises an inner layer, an outer layer and a middle layer, and a layer fiber solution is sprayed between the inner layer and the middle layer and between the outer layer and the middle layer; the preparation process comprises the steps of premixing, double-field coupling synergistic spinning, foaming, surface modification, construction of the microfluidic moisture-conducting layer and three-stage heat setting. According to the invention, the spraying design of the layer fiber solution can enhance the interlayer binding force of the hollow heating fabric, and the addition of the PCM microcapsule suspension and the TPU base material can form a core-sheath structure of the fabric, thereby significantly improving the mechanical properties of the fabric; the silane coupling agent is added, so that interface bonding among different materials can be enhanced; the energy consumption can be reduced and the attenuation performance of the fabric can be reduced by double-field coupling synergistic spinning auxiliary fabric forming; the three-stage heat setting can improve the dynamic environment adaptability of the fabric.

Description

Technical Field

[0001] The present invention relates to the technical field of functional textile materials, and particularly to a hollow heat - generating fabric for winter robe warmth and its preparation process. Background Art

[0002] Traditional winter warmth - retaining fabrics mainly rely on increasing thickness or filling materials such as down to achieve heat preservation, but there are problems such as heaviness, poor air permeability, and moisture accumulation.

[0003] The publicly disclosed Chinese patent, with the publication number CN115416382A, discloses a laminated - structure hollow micro - nano fiber non - woven material and its preparation method and application, including the following steps: (1) completely dissolve polyacrylonitrile powder in a solvent, and then add far - infrared nano - particles and disperse them evenly; (2) use the polyacrylonitrile / far - infrared nano - particle mixed solution as the shell layer and temperature - controllable wet air as the core layer, and use the coaxial electrospinning method for spinning. Receive the spun fibers with a liquid coagulation bath, and prepare a laminated - structure micro - nano fiber aggregate with different fiber diameters and hollowness by gradient - regulating the properties of the spinning solution and the spinning process parameters; (3) reinforce the micro - nano fiber aggregate by the hydroentangling method to prepare a laminated - structure hollow micro - nano fiber non - woven material.

[0004] The above - mentioned publicly disclosed patent adopts a laminated hollow fiber structure, but has the following defects:

[0005] 1. The density difference between the inner layer and the outer layer (tightly packed) and the middle layer (fluffy structure) is significant, which may lead to insufficient interfacial bonding force and easy delamination under long - term use or mechanical stress;

[0006] 2. The bending stiffness of the hollow micro - fibers (2.5μm in diameter) may be insufficient to maintain the three - dimensional porosity, and the fabric has poor adaptability to the dynamic environment. Summary of the Invention

[0007] In view of the above - mentioned disadvantages of the prior art, the purpose of the present invention is to provide a hollow heat - generating fabric for winter robe warmth and its preparation process. By spraying a fiber solution between the inner layer and the middle layer, and between the outer layer and the middle layer, the fibers of the inner layer and the outer layer are partially embedded in the middle layer to form a mechanical anchoring in the vertical direction, greatly enhancing the interfacial bonding force of the hollow heat - generating fabric, avoiding the problem of easy delamination under long - term use or mechanical stress, and improving the application effect of the hollow heat - generating fabric; in the preparation process, three - stage heat setting is adopted, and the fabric is pre - relaxed, axially stretched, and radially stretched under different temperature conditions to enhance the three - dimensional dynamic bending performance of the fabric and improve the adaptability of the fabric to the dynamic environment; to solve the problems of insufficient interfacial bonding force and easy delamination of the fabric and poor adaptability of the fabric to the dynamic environment in the prior art.

[0008] To achieve the above and other related purposes, the present invention provides a hollow heating fabric for winter robe warmth, which includes an inner layer, an outer layer, and an intermediate layer disposed between the inner layer and the outer layer. Both the inner layer and the outer layer are made of nanoscale hollow fibers, and the intermediate layer is made of micron-scale hollow fibers;

[0009] A fiber solution is sprayed between the inner layer and the intermediate layer, and between the outer layer and the intermediate layer, so that the hollow fibers between the inner layer and the intermediate layer, and between the outer layer and the intermediate layer are cross-interlocked, forming a mechanical anchoring in the vertical direction between the inner layer and the intermediate layer, and between the outer layer and the intermediate layer.

[0010] In an embodiment of the present invention, carbon nanotubes and 8% - 12% graphene composite slurry are admixed in the inner layer;

[0011] The intermediate layer is filled with 0.5 - 2μm aerogel microspheres and PCM phase change material;

[0012] A metal oxide far-infrared coating is sprayed on the outer layer, and the far-infrared emissivity of the metal oxide far-infrared coating is ≥88%.

[0013] In an embodiment of the present invention, the fiber cross-sections of the inner layer, the outer layer, and the intermediate layer are all ax-shaped, and antimony-doped tin oxide nanoparticles are loaded on the inner walls of the ax-shaped hollow fibers.

[0014] In an embodiment of the present invention, the hollowness of the ax-shaped hollow fiber is 46% - 52%, and the compression resilience is ≥80%.

[0015] In an embodiment of the present invention, the inner layer is injected with PCM microcapsule suspension, and the outer layer is coated with a TPU substrate to form a core-sheath structure of the fabric.

[0016] The present invention provides a preparation process for a hollow heating fabric for winter robe warmth, which is used to prepare the hollow heating fabric for winter robe warmth, and includes the following steps:

[0017] S1. Premixed material: Dissolve 60 - 70wt% of polyimide, 8 - 12wt% of graphene, and 5 - 8wt% of aerogel in N-methylpyrrolidone to form a spinning solution;

[0018] S2. Dual-field coupling coaxial electrospinning: Use the spinning solution as the shell layer and temperature-controllable humid air as the core layer, and perform electrospinning by using the coaxial electrospinning method; During the electrospinning process, an alternating magnetic field and a high-voltage electrostatic field are applied for dual-field coupling. The alternating magnetic field aligns the carbon nanotubes axially, and the high-voltage electrostatic field induces the graphene sheets to be horizontally oriented for electrospinning to obtain a fiber aggregate;

[0019] S3. Foaming: Add 3-5 wt% of a photosensitive foaming agent to the fiber assembly for foaming, and the foaming time is 3-5 min. After foaming is completed, irradiate the fiber assembly with 808 nm near-infrared laser in a directional manner to trigger local foaming to form a three-stage hollow structure, and obtain hollow fibers.

[0020] S4. Surface modification: Use plasma grafting modification technology to treat the surface of the hollow fibers to form a nanoscale rough structure.

[0021] S5. Construct a microfluidic moisture-conducting layer: Inject a hydrophilic modifier into the hollow cavity of the hollow fibers using a microfluidic chip to form a capillary network, and the moisture-conducting rate of the capillary network is ≥ 0.8 mL / cm 2 ·min;

[0022] S6. Three-stage heat setting: Place the modified hollow fibers in sequence under a temperature condition of 120 °C for pre-relaxation, under a temperature condition of 160 °C for axial stretching, and under a temperature condition of 220 °C for radial stretching, and then rapidly cool and set to obtain a hollow heat-generating fabric.

[0023] In an embodiment of the present invention, in step S1, 0.5-1 wt% of a silane coupling agent is added to the spinning solution to improve the interfacial compatibility between polyimide and aerogel; the viscosity of the spinning solution is 1500-2500 cP.

[0024] In an embodiment of the present invention, in step S2, the intensity of the alternating magnetic field is 1.0-1.5 T, and the frequency is 50-100 Hz; the voltage of the high-voltage electrostatic field is 40-60 kV.

[0025] In an embodiment of the present invention, during the electrospinning process in step S2, layer fiber solutions with different concentrations are alternately sprayed, so that the inner and outer layer fibers are partially embedded in the intermediate layer to form a mechanical anchoring in the vertical direction; the cross-depth of the interlayer fibers reaches 5-10 μm, and the peel strength is increased by 40%.

[0026] In an embodiment of the present invention, in step S2, coaxial electrospinning is carried out using coaxial double needles. The coaxial double needles simultaneously inject a PCM microcapsule suspension into the inner layer and coat a TPU substrate on the outer layer to form a core-sheath structure in one step.

[0027] As described above, the hollow heat-generating fabric for winter robe warmth of the present invention and its preparation process have the following beneficial effects:

[0028] 1. The present invention sprays a layer of fiber solution between the inner layer and the middle layer, and between the outer layer and the middle layer, so that the fibers of the inner layer and the outer layer are partially embedded in the middle layer, forming a mechanical anchoring in the vertical direction, greatly enhancing the interfacial bonding force of the hollow heating fabric, avoiding the problem of easy delamination under long-term use or mechanical stress, and improving the application effect of the hollow heating fabric.

[0029] 2. The inner layer of the hollow heating fabric of the present invention is filled with a PCM microcapsule suspension, and the outer layer is coated with a TPU substrate, forming a core-sheath structure of the fabric. The core-sheath structure can significantly improve the mechanical properties of the fabric, as well as enhance the wear resistance and durability of the fabric.

[0030] 3. A silane coupling agent is added during the preparation of the mixed solution for the hollow heating fabric. The silane coupling agent chemically bonds or physically interacts with inorganic materials and organic materials through the functional groups at both ends of its molecule, thereby enhancing the interfacial bonding between different materials and improving the interfacial compatibility between polyimide and aerogel.

[0031] 4. The present invention uses dual-field coupling synergistic spinning in the preparation process to assist the fabric forming, which can reduce energy consumption and fabric attenuation performance compared with the traditional multi-layer composite process.

[0032] 5. The present invention adopts three-stage heat setting in the preparation process. By pre-relaxing, axially stretching, and radially stretching the fabric under different temperature conditions, the three-dimensional dynamic bending performance of the fabric is enhanced, and the dynamic environmental adaptability of the fabric is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It shows a schematic diagram of the layer structure of the present invention.

[0034] Figure 2 It shows a schematic diagram of the fiber cross-section of the present invention.

[0035] Figure 3 It shows a process flow chart of the preparation of the present invention.

[0036] DESCRIPTION OF REFERENCE NUMERALS

[0037] Inner layer 1; outer layer 2; middle layer 3. DETAILED DESCRIPTION OF THE INVENTION

[0038] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0039] Please refer to Figures 1 to 3It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should fall within the scope covered by the technical content disclosed in the present invention.

[0040] Example 1, please refer to Figures 1 - 2 , this example provides a hollow heating fabric for winter robe warmth, including an inner layer 1, an outer layer 2, and an intermediate layer 3 disposed between the inner layer 1 and the outer layer 2. Both the inner layer 1 and the outer layer 2 are made of nano-scale hollow fibers, and the intermediate layer 3 is made of micro-scale hollow fibers; a carbon nanotube and 8% - 12% graphene composite slurry is incorporated in the inner layer 1. The carbon nanotube and 8% - 12% graphene composite slurry is a new type of carbon-based conductive product with low resistance and high adhesion, which can actively generate heat by using the triboelectrification effect when contacting human skin; the intermediate layer 3 is filled with 0.5 - 2μm aerogel microspheres and PCM phase change material. The PCM phase change material is a stearic acid / silica composite, which can be used to store and release thermal energy; a metal oxide far-infrared coating is sprayed on the outer layer 2, and the far-infrared emissivity of the metal oxide far-infrared coating is ≥88% in the 8 - 14μm band, which can improve the radiation warming efficiency.

[0041] A layer of fiber solution is sprayed between the inner layer 1 and the intermediate layer 3, and between the outer layer 2 and the intermediate layer 3, so that the hollow fibers between the inner layer 1 and the intermediate layer 3, and between the outer layer 2 and the intermediate layer 3 are cross-interlocked, forming a vertical mechanical anchoring between the inner layer 1 and the intermediate layer 3, and between the outer layer 2 and the intermediate layer 3, greatly enhancing the interfacial bonding force of the hollow heating fabric and avoiding the problem of easy delamination under long-term use or mechanical stress, improving the application effect of the hollow heating fabric. The inner layer 1 is filled with a PCM microcapsule suspension, and the outer layer 2 is coated with a TPU substrate, forming a core-sheath structure of the fabric. The core-sheath structure can significantly improve the mechanical properties of the fabric and enhance the abrasion resistance and durability of the fabric.

[0042] The fiber cross-sections of the inner layer 1, the outer layer 2, and the intermediate layer 3 are all ax-shaped. The hollowness ratio of the ax-shaped hollow fiber is 46% - 52%, and the compression resilience is ≥80%. Antimony-doped tin oxide nanoparticles are loaded on the inner wall of the ax-shaped hollow fiber; the antimony-doped tin oxide nanoparticles have good electrical conductivity, and loading them on the inner wall of the hollow fiber can increase the electrical conductivity of the fiber; the antimony-doped tin oxide nanoparticles have chemical stability and weather resistance, and can maintain their performance in various environments, which makes the hollow fiber loaded with antimony-doped tin oxide nanoparticles perform well in outdoor use scenarios.

[0043] Example 2, please refer to Figure 3 , this example provides a preparation process of a hollow heating fabric for winter robe warmth, which is used to prepare the hollow heating fabric for winter robe warmth, and includes the following steps:

[0044] S1. Premixed material: Dissolve 60 - 70 wt% of polyimide, 8 - 12 wt% of graphene, and 5 - 8 wt% of aerogel in N-methylpyrrolidone to form a spinning solution; 0.5 - 1 wt% of silane coupling agent is added to the spinning solution. The silane coupling agent forms chemical bonds or physical interactions with inorganic materials and organic materials through the functional groups at both ends of its molecule, thereby enhancing the interfacial bonding between different materials and improving the interfacial compatibility between polyimide and aerogel. Specifically, the inorganic end (-Si(OR)3) of the silane coupling agent hydrolyzes to generate silanol (-Si-OH), which condenses with the hydroxyl groups on the surface of the inorganic component aerogel in the intermediate layer 3 to form Si-O-Si covalent bonds; the organic end of the silane coupling agent includes amino groups and epoxy groups, which are combined with the organic polymer polyimide in the inner layer 1 and the outer layer 2 through hydrogen bonds, van der Waals forces or covalent bonds to improve compatibility. The viscosity of the spinning solution is 1500 - 2500 cP.

[0045] S2. Dual-field coupling coaxial electrospinning: Use the spinning solution as the shell layer and temperature-controlled humid air as the core layer, and perform electrospinning by the coaxial electrospinning method; apply an alternating magnetic field and a high-voltage electrostatic field for dual-field coupling during the electrospinning process. The intensity of the alternating magnetic field is 1.0 - 1.5 T, and the frequency is 50 - 100 Hz; the voltage of the high-voltage electrostatic field is 40 - 60 kV; the alternating magnetic field aligns the carbon nanotubes axially, and the high-voltage electrostatic field induces the graphene sheets to be horizontally oriented for electrospinning to obtain a fiber aggregate; a coaxial double needle is used for coaxial electrospinning during the electrospinning process. The coaxial double needle simultaneously injects the PCM microcapsule suspension into the inner layer 1 and coats the TPU substrate on the outer layer 2 to form a core-sheath structure in one step; this step uses dual-field coupling coaxial electrospinning to assist in the formation of the fabric, which can reduce energy consumption and reduce the attenuation performance of the fabric compared with the traditional multi-layer composite process. Different concentrations of layer fiber solutions are alternately sprayed during the electrospinning process, so that the fibers in the inner layer 1 and the outer layer 2 are partially embedded in the intermediate layer 3 to form a mechanical anchoring in the vertical direction; the cross-depth of the interlayer fibers reaches 5 - 10 μm, and the measured peel strength is increased by 40%.

[0046] S3. Foaming: Add 3 - 5 wt% of a photosensitive foaming agent, namely azobisisobutyronitrile / carbon quantum dot composite, to the fiber aggregate for foaming, and the foaming time is 3 - 5 min; after foaming, use a near-infrared laser with a power density of 0.5 - 1.0 W / cm 2 808 nm to irradiate the fiber aggregate directionally to trigger local foaming to form a three-stage hollow structure and obtain hollow fibers;

[0047] S4. Surface modification: The surface of the hollow fiber is treated by plasma grafting modification technology to form a nanoscale rough structure;

[0048] S5. Construct a microfluidic moisture-conducting layer: Inject a hydrophilic modifier into the hollow cavity of the hollow fiber using a microfluidic chip with a channel width of 200 - 500 μm to form a capillary network, and the moisture-conducting rate of the capillary network is ≥ 0.8 mL / cm 2 ·min to achieve directional sweat export;

[0049] S6. Three-stage heat setting: The modified hollow fiber is successively pre-relaxed at a temperature of 120 °C, axially stretched at a temperature of 160 °C, and radially stretched at a temperature of 220 °C and then rapidly cooled and set to obtain a hollow heat-generating fabric; This step uses three-stage heat setting. By pre-relaxing, axially stretching, and radially stretching the fabric under different temperature conditions, the three-dimensional dynamic bending performance of the fabric is enhanced, and the dynamic environmental adaptability of the fabric is improved.

[0050] In summary, in the present invention, the spraying design of the layer fiber solution can enhance the interfacial bonding force of the hollow heat-generating fabric. The addition of the PCM microcapsule suspension and the TPU substrate can form a core-sheath structure of the fabric, significantly improving the mechanical properties of the fabric; the addition of the silane coupling agent can enhance the interfacial bonding between different materials; the dual-field coupling synergistic spinning assists the fabric forming, which can reduce energy consumption and reduce the attenuation performance of the fabric; the three-stage heat setting can improve the dynamic environmental adaptability of the fabric. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0051] The above embodiments are only illustrative of the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A hollow heat - generating fabric for winter gown warmth, comprising an inner layer, an outer layer, and an intermediate layer disposed between the inner layer and the outer layer. Both the inner layer and the outer layer are made of nano - scale hollow fibers, and the intermediate layer is made of micro - scale hollow fibers; It is characterized in that: A layer of fiber solution is sprayed between the inner layer and the intermediate layer, and between the outer layer and the intermediate layer, so that the hollow fibers between the inner layer and the intermediate layer, and between the outer layer and the intermediate layer are cross - interlocked, forming a mechanical anchoring in the vertical direction between the inner layer and the intermediate layer, and between the outer layer and the intermediate layer.

2. The hollow heat-generating fabric for winter robe warmth according to claim 1, wherein: The inner layer is admixed with carbon nanotubes and 8% - 12% graphene composite slurry; The intermediate layer is filled with 0.5 - 2μm aerogel microspheres and PCM phase - change material; A metal oxide far - infrared coating is sprayed on the outer layer, and the far - infrared emissivity of the metal oxide far - infrared coating is ≥88% (in the 8 - 14μm band).

3. The hollow heat-generating fabric for winter gown warmth according to claim 2, characterized in that: The fiber cross - sections of the inner layer, the outer layer, and the intermediate layer are all ax - shaped, and antimony - doped tin oxide nanoparticles are loaded on the inner walls of the ax - shaped hollow fibers.

4. The hollow heat-generating fabric for winter gown warmth according to claim 3, wherein: The hollow ratio of the ax - shaped hollow fibers is 46% - 52%, and the compression resilience is ≥80%.

5. The hollow heating fabric for winter robe warmth according to claim 4, characterized in that: The inner layer is filled with PCM micro - capsule suspension liquid, and the outer layer is coated with a TPU substrate, forming a core - sheath structure of the fabric.

6. A preparation process of a hollow heat-generating fabric for winter gown warmth, which is used to prepare the hollow heat-generating fabric for winter gown warmth according to any one of claims 1-5, and is characterized in that, It includes the following steps: S1. Premixed material: Dissolve 60 - 70wt% polyimide, 8 - 12wt% graphene, and 5 - 8wt% aerogel in N - methylpyrrolidone to form a spinning solution; S2. Dual - field coupling co - electrospinning: Use the spinning solution as the shell layer and temperature - controllable humid air as the core layer, and carry out electrospinning by the coaxial electrospinning method; During the electrospinning process, an alternating magnetic field and a high - voltage electrostatic field are applied for dual - field coupling. The alternating magnetic field arranges the carbon nanotubes axially, and the high - voltage electrostatic field induces the graphene sheets to be horizontally oriented for electrospinning to obtain a fiber aggregate; S3. Foaming: Add 3 - 5wt% photosensitive foaming agent to the fiber aggregate for foaming, and the foaming time is 3 - 5min; After foaming is completed, the fiber aggregate is irradiated directionally with 808nm near - infrared laser to trigger local foaming to form a three - stage hollow structure, obtaining hollow fibers; S4. Surface modification; Use plasma grafting modification technology to treat the surface of the hollow fibers to form a nano - scale rough structure; S5. Construct a microfluidic moisture-conducting layer: Inject a hydrophilic modifier into the hollow cavity of a hollow fiber using a microfluidic chip to form a capillary network, and the moisture-conducting rate of the capillary network is ≥ 0.8 mL / cm 2 ·min; S6. Three - stage heat setting: Place the modified hollow fibers under the temperature condition of 120℃ for pre - relaxation, under the temperature condition of 160℃ for axial stretching, and under the temperature condition of 220℃ for radial stretching and then quickly cool and set to obtain the hollow heat - generating fabric.

7. The preparation process of the hollow heat-generating fabric for winter robe warmth according to claim 6, characterized in that: In step S1, 0.5 - 1wt% silane coupling agent is added to the spinning solution to improve the interfacial compatibility between polyimide and aerogel; The viscosity of the spinning solution is 1500 - 2500cP.

8. The preparation process of the hollow heat-generating fabric for winter gown warmth retention according to claim 6, characterized in that: In step S2, the intensity of the alternating magnetic field is 1.0 - 1.5T, and the frequency is 50 - 100Hz; The voltage of the high - voltage electrostatic field is 40 - 60kV.

9. The preparation process of the hollow heat-generating fabric for winter robe warmth according to claim 8, characterized in that: During the electrospinning process in step S2, different concentrations of layer fiber solution are alternately sprayed, so that the inner - layer and outer - layer fibers are partially embedded in the intermediate layer, forming a mechanical anchoring in the vertical direction.

10. The preparation process of the hollow heat-generating fabric for winter gown warmth retention according to claim 9, characterized in that: In step S2, coaxial electrospinning is carried out using a coaxial double needle head. The coaxial double needle head simultaneously injects the PCM microcapsule suspension into the inner layer and coats the TPU substrate on the outer layer to form a core-sheath structure in one step.

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