Intelligent response type temperature regulating fabric and preparation method thereof

Abstract

This invention provides a smart responsive temperature-regulating fabric and its preparation method. The method specifically includes: S1, functional fiber preparation: PCM nanocapsule masterbatch is added at a mass ratio of 5%-15% during the maturation stage of 100% bio-based viscose solution. After uniform dispersion through high-speed shearing and ultrasonic treatment, a wet spinning process is used to obtain 1.2 denier 100% bio-based temperature-regulating viscose fiber; S2, spinning; S3, weaving; S4, finishing: the woven double-layer jacquard fabric with gradient pores is sequentially subjected to bio-enzyme polishing, low-temperature dyeing, softening treatment, and setting, etc. This invention utilizes core-shell structure fiber embedding technology to permanently and physically lock PCM nanocapsules within a non-water-soluble matrix inside the fiber, achieving a revolutionary effect where washing does not affect the enthalpy value. Furthermore, through fabric structure design, a biomimetic gas flow channel based on Bernoulli's principle is introduced to actively enhance heat dissipation when needed, compensating for the insufficient response speed of pure PCM materials during rapid heat generation.

Description

Technical Field

[0001] This invention belongs to the field of green and environmentally friendly functional textile materials and manufacturing technology. Specifically, it relates to a smart fabric based on 100% bio-based carbon fiber, which achieves long-lasting, stable, and dynamically responsive temperature regulation through the synergistic effect of molecular anchoring embedding technology and biomimetic structural design, as well as its environmentally friendly production method. Background Technology

[0002] PCM (phase change material) is a material with special thermal properties, capable of absorbing or releasing large amounts of heat when the temperature changes, thereby achieving temperature regulation and energy storage. Due to its unique thermal properties, PCM materials have wide applications in fields such as construction, textiles, electronics, and automobiles.

[0003] PCM (phase change material) can achieve two phase transition states depending on temperature changes: latent heat absorption and latent heat release. Latent heat absorption refers to the process where, as the temperature rises, the PCM material absorbs a large amount of heat energy and converts it into latent heat of phase change, maintaining a relatively stable internal temperature. Latent heat release occurs when the temperature drops, where the PCM material releases the previously absorbed heat and transfers it to the surrounding environment, thus achieving temperature regulation.

[0004] In the textile industry, PCM phase change materials can be used to manufacture comfortable functional textiles. For example, PCM phase change fibers can be made into summer cooling mats or winter warm clothing, providing a comfortable regulating function between the body temperature and the ambient temperature.

[0005] Current phase change temperature regulation technology for textiles mainly involves the following two technical approaches and their inherent drawbacks: (1) Finishing technology approach: This technology attaches phase change material (PCM) microcapsules to the fiber surface through coating or padding processes. This method has obvious drawbacks: the PCM microcapsules are directly exposed to the external environment and are easily eroded by mechanical friction and chemical detergents during actual wear and washing, leading to rapid shedding and functional failure. Tests show that the wash resistance of such fabrics is usually less than 20 times, and the functional durability is difficult to guarantee, failing to meet the service life requirements of high-quality clothing.

[0006] (2) Fiber blending technology: This technology involves blending PCM masterbatch with spinning melt or solution before spinning. While an improvement over the finishing type, it still suffers from the following problems: the PCM microcapsules are unevenly distributed in the fiber, the high shear force during spinning can easily damage the capsule structure, and they may still slowly leak out under the long-term penetration of water and surfactants, affecting the long-term stability of the function. More importantly, in the existing technology, whether it is the microcapsule or the fiber matrix (such as polyester or nylon), the main raw materials are all derived from petrochemicals, resulting in a high carbon footprint, which does not meet increasingly stringent environmental regulations and market demands.

[0007] Furthermore, while simple cooling fabrics typically employ thermally conductive fibers or special surface structures to provide an immediate cooling sensation, they lack the ability to buffer against temperature fluctuations and cannot cope with changes in ambient temperature or fluctuations in body heat production. Simultaneously, their synthetic fiber base materials also face the problem of dependence on non-renewable resources.

[0008] Therefore, how to organically combine long-lasting, near-permanent phase-change temperature regulation with an actively enhanced dynamic cooling mechanism, and achieve environmental friendliness from the material source, remains a long-standing technical challenge in this field. Specifically: 1) How to solve the washability problem of PCM from the material's perspective; 2) How to construct an effective dynamic heat dissipation mechanism; 3) How to create high-performance and low-carbon intelligent temperature-regulating materials based on renewable biomass raw materials. Currently, mature technical solutions integrating these three aspects are still lacking. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention proposes an intelligent responsive temperature-regulating fabric and its preparation method, which solves the bottleneck of PCM washability, achieves intelligent responsive temperature regulation, and possesses excellent environmental protection properties.

[0010] To achieve the above technical solution, the present invention provides a method for preparing a smart responsive temperature-regulating fabric, specifically including the following steps: S1. Preparation of functional fibers: PCM nanocapsule masterbatch is added at a mass ratio of 5%-15% during the maturation stage of 100% bio-based viscose solution. After uniform dispersion by high-speed shearing and ultrasonic treatment, 1.2 denier 100% bio-based temperature-regulating viscose fiber is obtained by wet spinning process. S2, Spinning: According to the mass ratio, 50% of the 100% bio-based temperature-regulating viscose fiber obtained in step S1 above and 50% of cotton are spun into a 40S / 1 bio-based composite yarn using compact Siro spinning technology. S3. Weaving: Use a computer-controlled double-sided jacquard rib circular knitting machine (such as Shanghai Yifang QJZ036 / D type or similar equipment with transfer jacquard function), machine size E28, equipped with spandex yarn feeding device, to weave a double-layer jacquard structure fabric with gradient holes. The equivalent diameter of the holes in the skin-contact layer is D1, and the equivalent diameter of the holes in the outer layer is D2, controlled at 0.25 ≤ D1 / D2 ≤ 0.60, and add 30D spandex yarn to the outer layer of the fabric. S4. Finishing: The double-layer jacquard fabric with gradient holes obtained by weaving is sequentially subjected to bio-enzyme polishing, low-temperature dyeing, softening treatment and shaping.

[0011] Preferably, in step S1, the 100% bio-based viscose spinning solution is a spinning solution prepared from viscose staple fiber pulp that meets the 100% bio-based requirements of USDA organic certification, thus eliminating the dependence on petroleum-based chemical fibers (such as polyester and nylon) from the source.

[0012] Preferably, in step S1, the core-shell ratio of the PCM nanocapsule masterbatch is 70:30. The core layer is made of nanoscale phase change material PCM with a phase change temperature of 28-32℃ and a phase change enthalpy of not less than 15.0 J / g. The shell layer is a polymer with excellent compatibility with viscose spinning solutions and contains reactive functional groups that can chemically bond or strongly physically entangle with regenerated cellulose molecules. Through this design, the reactive functional groups of the shell layer can chemically bond (e.g., ester bonds, ether bonds) or strongly physically entangle with the cellulose molecules of viscose fibers. This is not merely physical mixing, but chemical "anchoring." Even under long-term penetration by water and surfactants, PCM is difficult to migrate or be lost from the fiber interior, achieving "near-permanent temperature regulation." The comfortable temperature range for the human body: The phase change temperature of 28-32℃ precisely covers the comfortable range of the human body's surface microclimate. When skin temperature rises, it absorbs heat to cool down; when it falls, it releases heat to keep warm, providing an intelligent response.

[0013] Preferably, in step S1, the wet spinning process uses a sulfuric acid-sodium sulfate system as the coagulation bath, and the spinning speed is 50-70 m / min. The sulfuric acid-sodium sulfate system is a typical coagulation bath for viscose fibers, but combined with the high-speed shearing and ultrasonic treatment in S1, it ensures that at a specific speed (50-70 m / min), the PCM capsules are uniformly distributed radially in the fiber, and the fiber cross-sectional structure is stable, avoiding the problem of high shear force damaging the capsule structure. Furthermore, a spinning speed below 50 m / min results in excessively low production efficiency, while a speed above 70 m / min may lead to uneven radial distribution of the PCM capsules in the fiber, affecting functional uniformity.

[0014] Preferably, in step S2, the twist coefficient of the bio-based composite yarn is controlled to be 370-390, and the evenness CV value is ≤12%.

[0015] Preferably, in step S2, a double-ply reverse twisting technique is used during compact Siro spinning to twist the single yarn in both the Z and S directions. Double-ply reverse twisting (Z / S direction twisting) completely eliminates the internal stress of the single yarn, making the final fabric less prone to deformation, curling, or twisting, thus improving the yarn structure stability and abrasion resistance. This is crucial for subsequently constructing a precise gradient cavity structure and ensuring weaving accuracy.

[0016] Preferably, in step S3, the equivalent diameter of the pores in the skin-adhesive layer is controlled as D1 = 0.20 ± 0.02 mm, and the equivalent diameter of the pores in the outer layer is controlled as D2 = 0.50 ± 0.03 mm. The precise ratio of D1 / D2 = 0.4, after optimization, can generate the best capillary pressure difference, which ensures the driving force for moisture absorption and perspiration, while avoiding the problem of excessively large pores causing cold air penetration or excessively small pores causing stuffiness.

[0017] Preferably, in step S3, spandex is placed in the non-functional layer of the fabric by means of "adding yarn" or "inserting weft", and the feeding ratio is controlled at 2%-5%. Placing spandex in the outer layer (non-skin-contact layer) avoids the allergies or pressure that may be caused by spandex directly contacting the skin. At the same time, the high elasticity of the outer layer ensures the overall resilience of the fabric, while the skin-contact layer maintains the comfortable touch of the temperature-regulating fibers.

[0018] The present invention also provides a smart responsive temperature-regulating fabric, which is prepared by the above method.

[0019] The beneficial effects of the intelligent responsive temperature-regulating fabric provided by the invention are as follows: (1) This invention uses “100% bio-based temperature-regulating viscose fiber”, which eliminates the dependence on petroleum-based chemical fibers (such as polyester and nylon) from the source, meets the USDA bio-based certification requirements, greatly reduces the carbon footprint, and adds PCM nanocapsules in the “solution curing stage” so that the capsules are wrapped inside the fiber. The subsequent wet spinning further solidifies them, greatly enhancing the water resistance and the durability of the function (close to permanent).

[0020] (2) By controlling the pore size ratio of the skin-adhesive layer to the outer layer (0.25≤D1 / D2≤0.60), this invention constructs a gradient pore structure, which can produce a "Bernoulli" effect. This structure utilizes capillary effect and pressure difference to rapidly "pump" the moisture / heat generated by the skin from the inner layer's small pores to the outer layer's large pores, achieving active dynamic cooling and compensating for the shortcomings of simple PCM passive temperature regulation.

[0021] (3) This invention is the first to organically combine two physical mechanisms, "passive buffering" (PCM phase change) and "active acceleration" (Bernoulli channel enhanced heat dissipation), enabling the fabric to intelligently adapt to different states of the human body from static to dynamic, thus providing a wider range of comfort. Moreover, the "embedded PCM" structure adopted in this invention avoids interference with the fine structure of the fabric by the finishing process, allowing the "Bernoulli structure" to be accurately realized; while the "Bernoulli structure" effectively compensates for the physical limits of the PCM response speed. The "green substrate" provides an environmentally friendly foundation for the entire high-performance system, and the three work together to produce a comprehensive benefit of "1+1+1>3".

[0022] (4) The preparation method of this intelligent responsive temperature-regulating fabric has a robust and reliable process chain. Its function does not depend on the fragile finishing coating. The fabric has excellent abrasion resistance, washability and lasting soft hand feel. It is especially suitable for sports, outdoor, high-end underwear and environmentally friendly uniforms and other garment applications with high requirements for both quality and environmental protection. Attached Figure Description

[0023] Figure 1 This is a process flow diagram of the present invention.

[0024] Figure 2 This is a structural diagram of the yarn after reverse twisting of two strands in this invention.

[0025] Figure 3 This is a microscopic image of PCM embedded in the fiber.

[0026] Figure 4 This is a microscopic schematic diagram of PCM nanocapsules embedded in fibers.

[0027] Figure 5 This is a schematic diagram of the structure of Z-twist reverse yarn and S-twist regular yarn.

[0028] Figure 6 This is a schematic diagram of the gradient holes - inner layer holes D1 in the double-layer structure of the transfer needle jacquard fabric.

[0029] Figure 7 This is a schematic diagram of the gradient holes - outer layer holes D2 in the double-layer structure of the transfer needle jacquard fabric.

[0030] In the picture: 1. 100% bio-based temperature-regulating viscose fiber; 2. Cotton; 3. 30D spandex. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0032] Example 1: A method for preparing a smart responsive temperature-regulating fabric.

[0033] Reference Figures 1 to 7 As shown, a method for preparing a smart responsive temperature-regulating fabric specifically includes the following steps: (I) Preparation of functional fibers raw material: Green substrate: The functional carrier is viscose fiber with 100% bio-based carbon content, which is obtained by spinning dope made from viscose staple fiber pulp that meets the USDA 100% bio-based requirements. The viscose fiber is derived from natural cellulose (such as wood pulp and bamboo pulp managed in a sustainable manner), and its organic carbon is confirmed by radiocarbon (C14) testing (such as ASTM D6866 standard) to be entirely derived from modern biomass. This is the basis for realizing the environmental protection attributes of this invention.

[0034] Functional unit: Employs "PCM nanocapsule masterbatch" (refer to...) Figure 3 and Figure 4 As shown in the figure, the shell polymer of this masterbatch is a bio-based polymer or a polymer material with excellent compatibility with bio-based adhesives. Among them: Core layer: is a nanoscale phase change material (PCM), with a preferred phase change temperature of 28-32℃ and a phase change enthalpy of not less than 15.0 J / g.

[0035] Shell: A high-molecular-weight polymer with excellent compatibility with viscose spinning solution (cellulose sulfonate solution), containing reactive functional groups (such as hydroxyl, carboxyl, and epoxy groups) that can chemically bond (e.g., esterification, etherification) or strongly physically entangle with regenerated cellulose molecules. Through this design, the reactive functional groups of the shell can chemically bond (e.g., ester bonds, ether bonds) or strongly physically entangle with the cellulose molecules of viscose fibers. This is not merely physical mixing, but chemical "anchoring," making it difficult for PCM to migrate or be lost from the fiber interior even under long-term penetration by water and surfactants, achieving "near-permanent temperature regulation." Human Comfort Temperature Range: The phase transition temperature of 28-32℃ precisely covers the comfortable range of the human body's surface microclimate. When skin temperature rises, it absorbs heat to cool down; when it falls, it releases heat to keep warm, providing an intelligent response.

[0036] Process: PCM nanocapsule masterbatch (core-shell ratio 70:30) was added at a mass ratio of 10% during the maturation stage of 100% bio-based viscose solution, and uniform dispersion was achieved by high-speed shearing (10000 rpm, 30 min) and ultrasonic treatment (40 kHz, 15 min).

[0037] Spinning: A wet spinning process was used with a sulfuric acid-sodium sulfate coagulation bath at a spinning speed of 60 m / min to produce 1.2 denier 100% bio-based temperature-regulating viscose fiber. Two key processes occurred during the subsequent wet spinning and coagulation regeneration: a) cellulose regeneration formed a three-dimensional network; b) the masterbatch shell polymer and regenerated cellulose molecules underwent in-situ crosslinking and / or deep physical entanglement, forming an interpenetrating network structure. This process ensured that each PCM nanocapsule was firmly "chemically anchored" within the bio-based cellulose network matrix.

[0038] Through this design, the PCM unit is completely encapsulated and locked within 100% bio-based fibers, isolating it from the external environment. Its temperature regulation function does not rely on any surface finishing coatings, and theoretically, its wash life is equivalent to the physical life of the fiber itself. More importantly, the entire functional unit is built upon renewable resources. Tests have shown that fabrics prepared using this technology retain over 98% of their enthalpy after 50 washes according to GB / T 12490 standards; simultaneously, according to ASTM D6866 standards, their bio-based carbon content remains 100%.

[0039] (ii) Spinning Formula: 50% of the above 100% bio-based temperature-regulating viscose fiber + 50% cotton (bio-based).

[0040] Process: Using compact Siro spinning technology, a 40S / 1 bio-based composite yarn is spun, with a twist coefficient of 380 and a yarn evenness CV value ≤12%. The spinning structure is as follows: Figure 2 As shown, it is specifically woven from 100% bio-based temperature-regulating viscose fiber 1, cotton 2 and 30D spandex 3.

[0041] To address the potential strength reduction issue of embedded PCM fibers and maintain the bio-based advantages of the system, the following spinning strategy is adopted: the 100% bio-based temperature-regulating viscose fiber and high-strength bio-based fibers (such as high-strength cotton, lyocell fiber, and hemp fiber) are spun in a specific ratio of 50:50 to achieve a compact Siro spinning, thereby improving the overall strength, weaveability, and bio-based content of the yarn.

[0042] Using double-strand reverse twisting technology (refer to) Figure 5 As shown): Double twisting of the single yarn in both Z and S directions improves the yarn's structural stability and abrasion resistance. Double-ply reverse twisting (Z / S direction twisting) completely eliminates the internal stress of the single yarn, making the final fabric less prone to deformation, curling, or twisting, thus improving yarn structural stability and abrasion resistance. This is crucial for subsequently constructing a precise gradient cavity structure, ensuring weaving accuracy.

[0043] (III) Weaving Equipment: 28 needles / inch (E28) double-sided jacquard circular knitting machine, equipped with electronic needle selection and yarn feeding system.

[0044] Structure: Double-layer jacquard weave with gradient perforations (see reference) Figure 6 and Figure 7 (As shown), design parameters: The equivalent diameter of the pores in the skin-penetrating layer is D1 = 0.20 ± 0.02 mm; The equivalent diameter of the outer layer hole, D2, is 0.50 ± 0.03 mm. D1 / D2 = 0.40.

[0045] Off-machine parameters: weight 195 ± 5 gsm, thickness 0.85 ± 0.05 mm.

[0046] By controlling the precise ratio of the equivalent diameter of the pores in the skin-adhesive layer, D1 / D2=0.4, the optimal capillary pressure difference can be generated after optimization. This ensures the driving force for moisture absorption and perspiration while avoiding the problem of cold air penetration due to excessively large pores or stuffiness due to excessively small pores. Elastic Design: 30D spandex is added to the outer layer of the fabric at a feeding ratio of 3%. Placing the spandex in the outer layer (non-skin-contact layer) avoids potential allergies or pressure caused by direct skin contact. The high elasticity of the outer layer ensures the overall resilience of the fabric, while the skin-contact layer maintains the comfortable feel of the temperature-regulating fibers. Furthermore, the spandex (stretcher) is primarily placed in the non-functional layers of the fabric (outer or intermediate connecting layers) using either "addition" or "weft insertion" methods. This ensures that the Bernoulli pore structure area of ​​the skin-contact layer is mainly composed of bio-based functional yarns, avoiding the influence of elastic yarns on the stability of the pore shape.

[0047] In the aforementioned weaving process, this invention employs a double-layer transfer-loop jacquard knitting structure to construct a biomimetic airflow channel. The core design parameters are: the equivalent hydraulic diameter D1 of the jacquard holes in the skin-contact layer (inner layer), and the equivalent hydraulic diameter D2 of the jacquard holes in the outer layer; both satisfy a specific proportional relationship: 0.25 ≤ D1 / D2 ≤ 0.60. This structure forms a series of "micro-Venturi tube" type gradually expanding airflow channels within the fabric. When air flows through the fabric due to human movement or external wind: at the narrow skin-contact layer holes (D1), the airflow is forcibly accelerated. According to Bernoulli's principle, the increased flow velocity leads to a decrease in static pressure at that location. The resulting pressure gradient creates a "pump" effect on the humid-heat boundary layer of the skin surface, efficiently drawing it away from the skin. The drawn-out humid-heat air gradually slows down and diffuses outward through the gradually expanding channels (D2>D1), avoiding backflow.

[0048] The aforementioned double-layer transfer-loop jacquard knit structure creates an airflow channel that works synergistically with the PCM (Polymerized Thermal Microwave). In a static / micro-activity state, the temperature is primarily buffered by the latent heat of phase change within the embedded PCM, maintaining a comfortable microclimate. In a dynamic / high-metabolic state, when body heat production increases dramatically and the PCM's heat absorption rate approaches saturation, the airflow automatically generated by body movement "activates" the Bernoulli channels, providing powerful auxiliary evaporative cooling and preventing heat buildup. These two mechanisms automatically switch between primary and secondary functions based on the body's state, complementing and relaying each other in terms of time and efficiency to achieve adaptive temperature control.

[0049] Computational fluid dynamics (CFD) simulations were used to optimize parameters such as the D1 / D2 ratio, pore density, and fabric thickness to achieve the best suction effect within the target wind speed range (e.g., 0.5-2.0 m / s). Experimental results show that the optimized structure can improve evaporative heat dissipation efficiency by 30-50% compared to ordinary knitted fabrics of the same weight.

[0050] (iv) Post-processing The woven double-layer jacquard fabric with gradient perforations was sequentially subjected to bio-enzyme polishing, low-temperature dyeing, softening treatment, and setting. The specific parameters for each process are as follows: (1) Bioenzyme polishing: cellulase concentration 2% (owf), temperature 50℃, time 45 min, pH 5.0.

[0051] (2) Low temperature staining: reactive dye, maximum temperature 75℃, keep warm for 40 min.

[0052] (3) Softening treatment: 30 g / L of hydrophilic amino silicone oil softener, 70% impregnation rate, and drying at 110℃.

[0053] (4) Shaping: 130°C × 30 s, overfeed rate +5%.

[0054] Through gentle and green finishing processes, only necessary bio-enzyme polishing, low-temperature reactive dyeing (temperature <80℃ to protect the PCM structure), and hydrophilic silicone oil softening are performed. This completely avoids processes such as high-temperature resin finishing and intense mechanical friction that could damage the internal PCM structure of the fiber. Furthermore, this process route is more energy-efficient and low-carbon, aligning with the green philosophy of bio-based materials.

[0055] This invention uses viscose fiber with 100% bio-based carbon as a functional carrier, ensuring that the core carbon element of the entire material system comes from renewable biomass (such as wood pulp and bamboo pulp) rather than chemical substrates. It leads the trend of green consumption, gets rid of dependence on petroleum-based chemical fibers (such as polyester and nylon) from the source, meets the USDA bio-based certification requirements, significantly reduces carbon footprint, and adds PCM nanocapsules in the "solvent maturation stage" so that the capsules are encapsulated inside the fiber. Subsequent wet spinning further solidifies them, greatly enhancing the wash resistance and functional durability (close to permanent).

[0056] This invention constructs a gradient pore structure by controlling the pore size ratio of the skin-adhesive layer to the outer layer (0.25≤D1 / D2≤0.60), which can produce a Bernoulli effect. This structure utilizes capillary effect and pressure difference to rapidly "pump" moisture / heat generated by the skin from the inner layer's small pores to the outer layer's large pores, achieving an active dynamic cooling sensation and compensating for the shortcomings of simple PCM passive temperature regulation.

[0057] This invention is the first to organically combine two physical mechanisms: "passive buffering" (PCM phase change) and "active acceleration" (Bernoulli channels for enhanced heat dissipation). This allows the fabric to intelligently adapt to different human states, from rest to movement, resulting in a wider range of comfort. Furthermore, the "embedded PCM" structure employed in this invention avoids interference with the fabric's fine structure during finishing processes, enabling the precise realization of the "Bernoulli structure." The "Bernoulli structure," in turn, effectively compensates for the physical limitations of PCM response speed. The "green substrate" provides an environmentally friendly foundation for the entire high-performance system, and the synergy of these three elements produces a comprehensive benefit of "1+1+1>3."

[0058] The manufacturing process of this intelligent responsive temperature-regulating fabric is robust and reliable, and its function does not depend on fragile finishing coatings. The fabric has excellent abrasion resistance, washability, and a lasting soft hand feel, making it particularly suitable for sports, outdoor, high-end underwear, and eco-friendly uniforms and other ready-to-wear applications that require both high quality and environmental protection.

[0059] This invention utilizes a unique "core-shell structure fiber embedding technology" to permanently and physically lock PCM nanocapsules within a water-insoluble matrix inside the fiber, achieving a revolutionary effect where washing does not affect the enthalpy value. Furthermore, through fabric structure design, it introduces biomimetic gas flow channels based on Bernoulli's principle to actively enhance heat dissipation when needed, compensating for the insufficient response speed of pure PCM materials during rapid heat generation. This also gives the fabric a dual-mode, adaptive temperature control capability of "buffering under normal conditions and accelerating under rapid heating."

[0060] Example 2: A smart responsive temperature-regulating fabric.

[0061] A smart responsive temperature-regulating fabric is prepared by the method described in Example 1.

[0062] The performance test results of this intelligent responsive temperature-regulating fabric are as follows: Phase change performance: Initial enthalpy 5.0 J / g. Rated as AAA phase change material.

[0063] Evaporative heat dissipation performance: The time for complete evaporation of moisture is shortened by 40% compared to the same weight of combed cotton plain weave fabric.

[0064] Durability: Martindale abrasion test (ISO 12947-2) up to 5000 cycles, no significant decrease in PCM function was observed.

[0065] Feel and appearance: Soft and skin-friendly, with a smooth surface and a clear and stable pore structure.

[0066] The above description is only a preferred embodiment of the present invention, but the present invention should not be limited to the content disclosed in the embodiments and drawings. Therefore, any equivalent or modified embodiments made without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for preparing a smart responsive temperature-regulating fabric, characterized in that... Specifically, the steps include the following: S1. Preparation of functional fibers: PCM nanocapsule masterbatch is added at a mass ratio of 5%-15% during the maturation stage of 100% bio-based viscose solution. After uniform dispersion by high-speed shearing and ultrasonic treatment, 1.2 denier 100% bio-based temperature-regulating viscose fiber is obtained by wet spinning process. S2, Spinning: According to the mass ratio, 50% of the 100% bio-based temperature-regulating viscose fiber obtained in step S1 above and 50% of cotton are spun into a 40S / 1 bio-based composite yarn using compact Siro spinning technology. S3. Weaving: Using a computer-controlled double-sided jacquard transfer rib circular knitting machine, equipped with a spandex yarn feeding device, weaving a double-layer jacquard structure fabric with gradient holes, wherein the equivalent diameter of the holes in the skin layer is D1 and the equivalent diameter of the holes in the outer layer is D2, controlled at 0.25≤D1 / D2≤0.60, and 30D spandex is fed into the outer layer of the fabric. S4. Finishing: The double-layer jacquard fabric with gradient holes obtained by weaving is sequentially subjected to bio-enzyme polishing, low-temperature dyeing, softening treatment and shaping.

2. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S1, the 100% bio-based viscose spinning solution is a spinning solution prepared from viscose staple fiber pulp that meets the 100% bio-based requirements of USDA organic certification.

3. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S1, the core-shell ratio of the PCM nanocapsule masterbatch is 70:

30. The core layer is made of nanoscale phase change material PCM with a phase change temperature of 28-32℃ and a phase change enthalpy of not less than 15.0 J / g. The shell layer is a polymer with excellent compatibility with viscose spinning solution and contains reactive functional groups that can chemically bond or strongly physically entangle with regenerated cellulose molecules.

4. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S1, the wet spinning process uses a sulfuric acid-sodium sulfate system as the coagulation bath, and the spinning speed is 50-70 m / min.

5. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S2, the twist coefficient of the bio-based composite yarn is controlled to be 370-390, and the evenness CV value is ≤12%.

6. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S2, a double-strand reverse twisting technique is used when performing compact Siro spinning to twist the single yarn in both the Z and S directions.

7. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S3, the equivalent diameter of the pores in the skin-adhesive layer is controlled to be D1 = 0.20 ± 0.02 mm, and the equivalent diameter of the pores in the outer layer is controlled to be D2 = 0.50 ± 0.03 mm.

8. The method for preparing the intelligent responsive temperature-regulating fabric as described in claim 1, characterized in that, In step S3, spandex is placed in the non-functional layer of the fabric by means of "adding yarn" or "inserting weft", and the feeding ratio is controlled at 2%-5%.

9. A smart responsive temperature-regulating fabric, characterized in that, It is prepared by any one of the methods described in claims 1-8.

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