Phase-change-material-based fabric with continuous cool feeling as well as preparation method and application of phase-change-material-based fabric

Abstract

The invention discloses a continuous cool fabric based on a phase change material, and belongs to the technical field of textile fabrics. The fabric is formed by interweaving composite yarns and spandex; the composite yarn comprises PCM chinlon and common FDY chinlon, and the mass percentage content of the PCM chinlon in the composite yarn is not higher than 50%. The specification of the composite yarn is 80D / 60F, and the specification of the spandex is 20D. According to the fabric, a small amount of PCM chinlon and common chinlon are selected to form the composite yarn, and the composite yarn is compounded with spandex to be woven according to a certain method, so that the continuous cool feeling is guaranteed, meanwhile, the raw material cost is effectively reduced, the PCM phase change performance is reserved to the maximum extent, and the performance of high Qmax value (heat flux), air permeability and phase change stability is achieved; the fabric can be widely applied to the fields of cool quilts, pillowcases, bed sheets, clothes and the like. Meanwhile, the invention further discloses a preparation method and application of the fabric.

Description

Technical Field

[0001] This invention belongs to the field of textile fabric technology, and in particular to a cooling fabric with phase change temperature control function, its preparation method and application. Background Technology

[0002] With rising living standards and upgraded consumption demands, consumers are increasingly demanding higher functionality and comfort from home textiles, clothing, and other intimate apparel. Cooling fabrics, as a core product in summer and high-temperature environments, are seeing a continuous rise in market attention. The core appeal of cooling fabrics is to effectively regulate the body's surface temperature through material or structural design, alleviating stuffiness and discomfort. Their applications have broadly covered cooling comforters, pillowcases, sheets, sportswear, and other fields.

[0003] Currently, cooling fabrics on the market are mainly divided into two categories: one is ordinary cooling fabric that relies on the thermal conductivity of the fiber itself or surface coating treatment. It achieves an initial cooling experience by quickly conducting heat or reducing heat absorption. However, this type of fabric lacks temperature buffering and continuous regulation capabilities, the cooling effect is short-lived, and it is easily affected by changes in ambient temperature, losing its cooling function after a period of use. The other type is cooling fabric made of phase change material (PCM) fibers. It utilizes the phase change characteristics of PCM to absorb and release heat within a specific temperature range to achieve dynamic temperature regulation. Theoretically, it can provide a continuous cooling effect. However, to ensure the cooling effect, existing PCM cooling fabrics usually use a high proportion of PCM fibers (mostly 70%-100%), which leads to a significant increase in raw material costs and makes it difficult to meet the large-scale application needs of mass consumer markets such as home textiles. In addition, fabrics with high PCM content are deficient in physical properties such as softness and elasticity, affecting the comfort of use. At the same time, PCM fibers are extremely sensitive to process parameters such as temperature, tension, and pH value during weaving and dyeing. Existing technologies lack specific process designs for PCM fibers. Problems such as frictional heating and uncontrolled pH value during dyeing caused by excessively high weaving speeds often damage the PCM microcapsule structure, resulting in a loss of phase transition enthalpy (usually 20%-30%), reducing the phase transition effect, and seriously affecting the cooling effect and stability of the fabric.

[0004] Therefore, existing ordinary cooling fabrics only provide an initial cooling sensation, lacking temperature buffering capacity and failing to achieve sustained comfort. High PCM content (>50%) yarns are significantly more expensive, limiting their application in the mass-market home textiles. Furthermore, PCM fibers are sensitive during weaving and dyeing, easily losing phase transition enthalpy due to improper control of machine speed, tension, and temperature. Existing fabrics often prioritize either cooling sensation or breathability, making it difficult to simultaneously achieve high Qmax (heat flux density), breathability, and phase transition stability. Developing a cooling fabric that balances sustained cooling sensation, high comfort, cost control, and stable processing has become a pressing technical challenge in the textile industry. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a fabric that can provide a continuous cooling sensation, has high breathability, and is low in cost. Furthermore, this invention also provides a method for preparing the fabric and its applications.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a continuous cooling fabric based on a phase change material, the fabric being made of a composite yarn interwoven with spandex; the composite yarn includes PCM nylon and ordinary FDY nylon, wherein the mass percentage of PCM nylon in the composite yarn is not higher than 50%; the composite yarn has a specification of 80D / 60F, and the spandex has a specification of 20D.

[0007] PCM nylon is a smart functional fiber formed by fusing Phase Change Material (PCM) with nylon (polyamide fiber) using microencapsulation technology. This invention uses PCM nylon and ordinary FDY nylon to form a composite yarn, which is then filament-by-filament to form an 80D / 60F composite yarn. This ensures that the PCM microcapsules are evenly dispersed in the yarn, avoiding excessively high or low concentrations in certain areas. This guarantees that phase change temperature control can be achieved in all areas of the fabric surface, eliminating the need for high PCM content to meet overall cooling requirements. The PCM nylon content is reduced from 70-100% in existing PCM cooling fabrics to below 50%, effectively lowering costs. Simultaneously, ordinary FDY nylon has excellent thermal conductivity, allowing it to quickly conduct heat from the human body surface to the PCM microcapsules, accelerating the PCM phase change heat absorption process. At the same time, the low temperature after the PCM phase change is conducted back to the body surface, forming a highly efficient cycle of "heat conduction - phase change heat absorption - low temperature feedback," improving the temperature control efficiency per unit of PCM. The composite yarn is then interwoven with spandex to prepare the fabric. The addition of 20D spandex makes the fabric form a single-sided elastic sweat fabric structure, which improves the fit between the fabric and the human body, reduces heat blockage caused by air gaps, and allows PCM to exchange heat with the body surface more directly, further enhancing the cooling experience and compensating for the effect reduction that may be caused by low PCM content.

[0008] Preferably, the PCM nylon has a specification of 40D / 36F and a phase transition temperature range of 23-33℃.

[0009] Preferably, the ordinary FDY nylon has a specification of 40D / 24F.

[0010] In this application, 40D / 36F PCM nylon and 40D / 24F ordinary FDY nylon are preferred because the linear density of 40D PCM nylon and 40D ordinary nylon is consistent, ensuring uniform tension during yarn doubling and avoiding yarn twisting and yarn breakage caused by differences in linear density. This also ensures that the PCM microcapsules are evenly distributed in the yarn. After doubling, the two are combined to obtain an 80D composite yarn, whose overall linear density is suitable for the weft knitting circular knitting machine's requirements. This satisfies the thickness and crispness requirements of home textile fabrics without causing the fabric to be too heavy or reducing its breathability due to excessive linear density. The combination of PCM nylon 36F and ordinary nylon 24F in terms of porosity ensures that the composite yarn has a sufficient number of fibers. On the one hand, it increases the distribution density of PCM microcapsules, ensuring sufficient phase change enthalpy per unit area of ​​fabric and guaranteeing a continuous cooling effect. On the other hand, the multi-pore structure increases the specific surface area of ​​the yarn, improving heat conduction efficiency and breathability. Combined with the thermal conductivity of ordinary nylon, it accelerates the heat absorption of PCM phase change and the exchange of heat with the body surface, enhancing the cooling experience.

[0011] 20D spandex boasts an elastic recovery rate exceeding 95%. When interwoven with 80D / 60F composite yarns, it creates a single-sided elastic jersey fabric structure, enhancing skin-friendly comfort and reducing air gaps between the fabric and skin. This allows for more direct heat exchange between the PCM and the skin surface. Its elastic structure is suitable for home textiles, clothing, and other applications, preventing wrinkles and deformation. Simultaneously, the fine denier of 20D spandex avoids excessive fabric thickness and weight, preventing obstruction of the composite yarn's breathability channels and ensuring high fabric breathability. The fewer interlacing points of the fine denier spandex also reduce physical obstruction of the PCM nylon, ensuring efficient heat exchange between the phase change material and the environment and preventing a decrease in cooling effect.

[0012] Preferably, the PCM nylon content in the composite yarn is 40-50% by mass. The inventors of this application have discovered that when the PCM nylon content in the composite yarn is less than 40% by mass, the distribution density of PCM microcapsules per unit area is insufficient, which may result in some areas failing to cover temperature fluctuations on the human body surface, leading to uneven cooling sensation or localized failure. Conversely, when the PCM nylon content in the composite yarn is greater than 50% by mass, it not only increases costs but also significantly reduces the softness and elasticity of the resulting fabric, and its sustained cooling effect does not significantly improve with increasing PCM nylon content. The PCM nylon content in the composite yarn may include, but is not limited to, any point value or a range formed by any two points, such as 40%, 42%, 44%, 46%, 48%, or 50%.

[0013] Preferably, the fabric is a single-sided elastic jersey fabric. When the fabric is a single-sided elastic jersey fabric, it can conform to the human body and has moderate elasticity, reducing air gaps and allowing PCM to exchange heat more directly with the body surface. At the same time, it is suitable for home textiles and clothing use scenarios, improving wearing and use comfort.

[0014] Preferably, the phase change temperature range of the fabric is 17.9-32.0℃. This phase change temperature range accurately covers the comfortable temperature range of the human body surface, allowing for rapid response to temperature changes and initiation of phase change for heat absorption / release, ensuring a continuous cooling experience.

[0015] Preferably, the enthalpy of melting of the fabric is ≥18J / g; the enthalpy of melting of the fabric is ≥18J / g, which can ensure that a unit mass of fabric can absorb sufficient heat, quickly reduce the body surface temperature, and meet the requirements for cooling intensity.

[0016] Preferably, the enthalpy of crystallization of the fabric is ≥19J / g, which ensures that sufficient heat is released when the temperature drops, buffers the temperature drop, and avoids excessive cooling or rapid failure.

[0017] More preferably, the fabric of the present invention has been tested and has a melting enthalpy of 18.2 J / g and a crystallization enthalpy of 19.2 J / g.

[0018] Preferably, the fabric has a Qmax value ≥ 0.5 W / cm² as tested by JIS L1927:2020 standard, and its cooling intensity is significant and can be clearly perceived by the human body.

[0019] Preferably, the fabric has an air permeability of ≥200mm / s as tested by ISO9237:1995 standard, ensuring air circulation, quickly dissipating excess heat from the body surface, avoiding stuffiness, and working in conjunction with phase change temperature control to extend the duration of the cooling sensation, ensuring that the fabric has good comfort.

[0020] Secondly, the present invention also provides a method for preparing a continuously cooling fabric based on a phase change material as described above. To achieve this objective, the technical solution adopted by the present invention is as follows: a method for preparing a continuously cooling fabric based on a phase change material as described above, the method comprising the following steps: (1) Yarn preparation: PCM nylon and ordinary FDY nylon are filament-coated to form composite yarn; (2) Weaving: The composite yarn obtained in step (1) is interwoven with spandex through a weft knitting circular knitting machine at a weaving speed of ≤12 rpm to obtain the greige fabric; (3) Dyeing and finishing: The grease fabric obtained in step (2) is first washed with water to remove oil and pre-shaped, then dyed and finished product shaping is carried out. The pH of the dyeing process is controlled at 4-6. The finished product is obtained and inspected to obtain the fabric.

[0021] In the preparation method described in this invention, the thickness and porosity distribution of the 80D / 60F composite yarn formed by the parallel spinning of PCM nylon and ordinary FDY nylon are adapted to the weaving scheme of "sharp knitting needles + specific triangular configuration", reducing the frictional contact area between the knitting needles and the yarn. Combined with low-speed weaving of ≤12 rpm, the damage to PCM microcapsules caused by frictional heating is reduced. Moreover, in step (2), the tension characteristics of 20D spandex match those of the 80D / 60F composite yarn. During weaving, the tension can be precisely adjusted by a tensioner to ensure that the three are woven together, avoiding uneven yarn stretching and PCM microcapsule rupture due to excessive elasticity of spandex, or fabric loosening and arching due to insufficient elasticity.

[0022] In step (2), the weaving speed needs to be controlled to ≤12 rpm. This speed selection was obtained by the inventors of this application through repeated experiments and tests on the raw material system of this application. Only by controlling the weaving speed to ≤12 rpm can the final fabric phase change enthalpy retention rate reach more than 90%, so that the fabric has a continuous cooling sensation and good breathability.

[0023] Preferably, the weaving speed is 8-12 rpm. The inventors of this application discovered that excessively low speeds lead to prolonged contact time between the knitting needles and yarns. While this can further reduce frictional heating and prevent damage to the PCM microcapsules, it may result in loosely woven loops, uneven fabric structure, and even defects such as yarn accumulation and needle entanglement. The chosen weaving speed of 8-12 rpm maintains the knitting needle temperature below the thermal stability threshold of the PCM microcapsules, ensuring a fabric phase change enthalpy retention rate of over 90%, while also ensuring the circular knitting machine can properly complete actions such as starting, knitting, and loop removal, thus guaranteeing fabric quality stability and balancing production efficiency. The preferred weaving speeds are, but are not limited to, 8, 9, 10, 11, and 12 rpm.

[0024] In step (3), the pH of the dyeing process needs to be controlled between 4 and 6 throughout. On the one hand, the PCM in the phase change nylon is encapsulated in microcapsules. The wall material of these microcapsules is prone to degradation and rupture in an alkaline environment, leading to PCM leakage and causing the fabric to lose its phase change temperature control function. Controlling the pH of the dyeing process within this range can effectively prevent the decline of the phase change temperature control function of the PCM nylon. On the other hand, regarding the raw material system in this application, the inventors found in their research that the dyeing rate of nylon is higher and the adsorption is more uniform under this pH range, which can avoid dyeing spots caused by the difference in hydrophilicity and hydrophobicity of the fibers. At the same time, it can enhance the binding force between the dye and the fiber, improve the color fastness, and prevent fading and color loss during subsequent use. Furthermore, under this condition, the degradation of spandex can be effectively reduced, ensuring the elasticity recovery of the finished fabric and maintaining the structure and comfort of the single-sided elastic jersey. Meanwhile, the pH conditions work synergistically with subsequent step-by-step temperature control and dyeing auxiliaries during the dyeing process. This not only prevents the dyeing auxiliaries from becoming ineffective but also reduces the impact of the combined effects of temperature and pH on PCM performance, ultimately ensuring that the fabric has a continuous cooling sensation, high breathability, and stable appearance quality.

[0025] Preferably, in step (1), before the PCM nylon and ordinary FDY nylon are filament-bound, the PCM nylon is placed in the workshop environment for 12-48 hours. Before the PCM nylon and ordinary FDY nylon are filament-bound, they are placed in the morning inspection environment for a period of time to balance the temperature and humidity.

[0026] To adapt to the special physical properties of PCM nylon, such as the difference in elongation compared to ordinary nylon and its sensitivity to friction and tension, and to avoid the rupture of phase change microcapsules, filament breakage, or fabric quality defects during weaving, this application describes the key processes of step (2) of the weaving process as follows: Knitting needle selection: Select knitting needles with matching specifications based on the linear density of the composite yarn (80D / 60F) and the structure of the single-sided elastic jersey fabric; at the same time, strictly control the quality of the knitting needles to ensure that the knitting needles are sharp, smooth, and free from damage or deformation, so as to reduce frictional contact damage between the knitting needles and the yarn, protect the structural integrity of the phase change nylon filament, and avoid damage to the phase change microcapsules due to frictional heating.

[0027] Triangle configuration adjustment: Based on the design requirements of the target fabric's structure, the triangle parameters of the weft knitting circular knitting machine are precisely adjusted, including the height, angle, and spacing of the triangles, so that the control of the needle movement trajectory and knitting action by the triangles is adapted to the weaving characteristics of phase change nylon filament, ensuring that the needles can smoothly complete a series of actions such as starting, knitting, and loop removal, and avoiding situations such as missing needles, skipped needles, or uneven fabric structure.

[0028] Precise tension control: Using specialized devices such as tensioners and yarn guides, the feeding tension of each component filament in the composite yarn (40D / 36F PCM nylon, 40D / 24F ordinary FDY nylon, and 20D spandex) is precisely adjusted to ensure uniform tension in each filament (ideally through real-time monitoring and calibration using a tension gauge). Given the difference in elongation between phase change nylon filaments and ordinary nylon, the tension adjustment process requires careful control to avoid excessive tension leading to filament breakage or rupture of phase change microcapsules, or insufficient tension causing fabric loosening or irregular loops, thus ensuring the stability of the weaving process and the quality of the finished fabric.

[0029] Speed ​​adaptation control: The machine speed is strictly controlled within 12 rpm to avoid filament breakage and needle entanglement caused by excessive speed, and to reduce the friction and temperature rise between the knitting needle and the yarn, preventing high temperature from damaging the phase change microcapsule structure and ensuring the stable temperature control performance of the phase change nylon.

[0030] Environmental parameter control: Preferably, the weaving temperature in step (2) is 20-25℃ and the humidity is 60-70%. To maintain the temperature and humidity stability of the weaving workshop, the temperature is controlled at 20-25℃ and the relative humidity is controlled at 60%-70% by using equipment such as air conditioners and humidifiers, so as to avoid the impact of environmental temperature and humidity fluctuations on the performance of phase change nylon filament and the stability of weaving quality.

[0031] Real-time process monitoring: Preferably, electronic monitoring systems, sensors and other equipment are used to monitor the loom's operating status and fabric quality in real time throughout the process, promptly detect abnormalities such as broken ends, missing needles, and oil stains, and stop the machine immediately once a problem is detected to prevent the defects from escalating and ensure the consistency and pass rate of the finished fabric.

[0032] By controlling the above weaving process, the risk of performance loss of PCM nylon filament during processing is effectively reduced, ensuring that the fabric can still maintain excellent phase change temperature control characteristics after subsequent dyeing and finishing, while ensuring that the fabric has a smooth appearance and uniform structure, providing a foundation for cooling effect and user comfort.

[0033] Preferably, in step (3), a neutral degreasing agent is added during the water washing process, the water washing temperature is 80-85℃, and the water washing speed is 20-30 yards / minute; in step (3), a neutral degreasing agent with high emulsifying ability is selected, and the washing is performed in a flat-width washing machine at 80-85℃. More preferably, the water washing speed is 25 yards / minute. The oil content after water washing and degreasing must be thoroughly checked; it should not be too high, which could lead to uneven dyeing. Alkali should not be used.

[0034] Preferably, in step (3), the pre-forming process uses a ten-section pre-forming machine, with a pre-forming temperature of 190-205℃ and a pre-forming speed of 10-30 yards / minute. More preferably, the pre-forming temperature is 198℃ and the pre-forming speed is 25 yards / minute.

[0035] Preferably, the dyeing in step (3) includes: mixing the greige fabric with dyeing agent and dyeing auxiliary agent and heating for dyeing, then cooling and performing soaping, hot water washing and cold water washing, and then dehydration.

[0036] Preferably, in step (3), the finished product setting temperature is 160-170℃, the finished product setting speed is 20-30 yards / minute, and antioxidants, hand feel adjustment agents and moisture-absorbing and quick-drying agents are added during the finished product setting process.

[0037] Preferably, in step (3), the dyeing auxiliaries used in the dyeing process include a bath softener, a high-temperature dispersing and leveling agent, a repairing agent, and a pH lubricant. The pH lubricant mainly adjusts the pH value during the dyeing process, keeping the pH at 4-5 throughout the dyeing process to achieve the purpose of slow dyeing. The dyeing agent used in the dyeing process is preferably a suitable dye with a dyeing rate of over 85%.

[0038] Preferably, in step (3), the dyeing process involves slowly adding the dye and dyeing auxiliaries to the fabric and running it for 10-30 minutes, gradually raising the temperature to 98-105℃ at a rate of 0.5℃ / min, and holding it for a total of 120-180 minutes. In step (3), the dye and dyeing auxiliaries are slowly added to the fabric, and all are added at a uniform rate within 20-30 minutes. After addition, the fabric is run for a period of time before further heating, preferably for 20 minutes. The gradual heating is a staged heating process, for example, the first stage involves raising the temperature to 40-60℃ and holding it for a period of time; the second stage involves raising the temperature to 60-70℃ and holding it for a period of time; the third stage involves raising the temperature to 70-80℃ and holding it for a period of time; the fourth stage involves raising the temperature to 80-98℃ and holding it for a period of time; and the fifth stage involves raising the temperature to 98-105℃ and holding it for a period of time.

[0039] More preferably, the temperature rise during the staining process in step (3) includes: raising the temperature to 40-60℃ at a rate of 0.5℃ / min and holding for 20min; raising the temperature to 60-70℃ at a rate of 0.5℃ / min and holding for 30min; raising the temperature to 70-80℃ at a rate of 0.5℃ / min and holding for 30min; raising the temperature to 80-98℃ at a rate of 0.5℃ / min and holding for 40min; and raising the temperature to 98-105℃ at a rate of 0.5℃ / min and holding for 30min.

[0040] Preferably, the cooling process in step (3) during the staining process is a staged cooling, ultimately cooling to 70-90℃; the staged cooling can be divided into two segments, for example, first maintaining at 90-105℃ for a period of time, and then cooling to 70-90℃. More preferably, the cooling process in step (3) during the staining process includes: cooling to 90-105℃ at 0.5℃ / min and maintaining for 20min, and then cooling to 70-90℃ at 1℃ / min.

[0041] Preferably, the soaping process in step (3) uses a nonionic surfactant, the soaping temperature is 70-90℃, and the soaping time is 10-30 minutes; more preferably, the soaping temperature is 85℃ and the soaping time is 20 minutes.

[0042] Preferably, the temperature of the hot water wash in the dyeing process in step (3) is 50-70℃ and the hot water wash time is 5-15min; more preferably, the temperature of the hot water wash is 60℃ and the hot water wash time is 10min.

[0043] Preferably, the cold water washing temperature in step (3) during the dyeing process is 30-40℃, and the cold water washing time is 5-15 min. More preferably, the cold water washing temperature is 40℃, and the cold water washing time is 10 min.

[0044] In step (3), after washing with cold water, dehydration is performed, and the dehydration time is preferably 10 minutes.

[0045] Preferably, in step (3), the finished product setting temperature is 160-170℃, the finished product setting speed is 20-30 yards / minute, and antioxidants, hand feel modifiers, and moisture-wicking and quick-drying agents are added during the finished product setting process. More preferably, the product setting speed is 25 yards / minute. The addition of these additives during the finished product setting process can improve the hand feel and durability of the fabric.

[0046] The above-described method for preparing a continuous cooling fabric based on phase change materials effectively reduces the risk of performance loss of PCM nylon filaments during processing by adjusting the selection of raw materials, optimizing the weaving process, and controlling the preparation process conditions. This ensures that the fabric can maintain excellent phase change temperature control characteristics after subsequent dyeing and finishing, while also ensuring a smooth fabric appearance and uniform structure, thus guaranteeing a continuous cooling effect and user comfort.

[0047] Finally, this invention also provides the application of the continuous cooling fabric based on phase change materials as described above in clothing and / or home textiles. The continuous cooling fabric based on phase change materials described in this invention has advantages such as continuous cooling and high breathability, and is relatively inexpensive. It can be widely used in cooling quilts, pillowcases, sheets, clothing, etc., providing a superior fabric option for clothing and / or home textiles.

[0048] The continuous cooling fabric based on phase change material described in this invention is made by selecting no more than 50% PCM nylon and ordinary nylon to form a composite yarn, and then combining it with spandex and weaving it according to a specific method. While ensuring continuous cooling, it effectively reduces raw material costs and retains the phase change properties of PCM to the maximum extent. It also has high Qmax value (heat flux density), breathability and phase change stability, and can be widely used in cooling quilts, pillowcases, sheets, clothing, etc. The continuous cooling fabric based on phase change material described in this invention addresses the special processing requirements of phase change nylon materials during weaving and dyeing. Through systematic process adjustment and optimization, it solves the performance retention problem of PCM materials during processing. It directly adjusts and optimizes the process conditions during weaving and dyeing to ensure that the enthalpy value is retained above 90%, that is, the enthalpy value loss is controlled within 10%, which is significantly reduced compared to the 20-30% loss often seen in existing technologies. This ensures that the prepared fabric has a balance of cooling, breathability, elasticity and durability. The process is highly versatile and does not require special equipment, making it easy to upgrade existing textile production lines and conducive to industrial-scale mass production. Attached Figure Description

[0049] Figure 1 This is a temperature change comparison curve of the phase change material-based continuous cooling fabric and the 160gsm nylon-spandex fabric in a heated scenario, as shown in Embodiment 1 of the present invention.

[0050] Figure 2 This is a temperature change comparison curve of the phase change material-based continuous cooling fabric and the 160gsm nylon-spandex fabric in a cooling scenario according to Embodiment 1 of the present invention.

[0051] Figure 3 This is a test sample of the continuous cooling fabric based on phase change material prepared in Example 1.

[0052] Figure 4 The DSC melt-crystallization characteristic curve of the continuous cooling fabric based on phase change material prepared in Example 1 is shown. Figure 4 In the diagram, A and C represent the results of three repeated DSC tests on test sample A.

[0053] Figure 5 The DSC blank curve for reference product B, which does not contain PCM nylon; Figure 5 In the figure, A and C represent the results of three repeated DSC tests of control sample B. Detailed Implementation

[0054] The technical solution and the technical effects achieved by the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0055] The sources of the raw materials used in the following embodiments are described below: The 40D / 36F PCM nylon was purchased from Zhejiang Sanmu New Materials Co., Ltd.

[0056] The ordinary FDY nylon with specifications of 40D / 24F was purchased from Zhejiang Jiahua Special Nylon Co., Ltd.

[0057] The 20D spandex was purchased from Hyosung Spandex (Jiaxing) Co., Ltd.

[0058] The neutral degreasing agent is AS-1040 amine degreasing agent, purchased from Zhejiang Jingguang Industrial Co., Ltd., with a pH value of 7.0-9.0. It is a compound of nonionic surfactant and ester solvent.

[0059] The bath softener is an amino-modified silicone microemulsion, specifically: GRISEX® G-2334 bath softener, purchased from Foshan Shunde Dyeing & Chemical Online Information Technology Co., Ltd.

[0060] The high-temperature dispersing and leveling agent is a compound of sodium fatty alcohol polyoxyethylene ether sulfate and alkylphenol polyoxyethylene ether, specifically: GRISEX® G-5192. It was purchased from Foshan Shunde District Dyeing & Chemical Online Information Technology Co., Ltd.

[0061] The repair agent is specifically: leveling repair agent 305, purchased from Shaoxing Haicheng Chemical Co., Ltd.

[0062] The pH lubricant is specifically pH buffer 320Pro, purchased from VWR (Shanghai) Co., Ltd.

[0063] Unless otherwise specified, all materials and equipment used are common in the field and can be prepared using conventional methods in the field or purchased directly.

[0064] Example 1 An embodiment of the present invention is a continuously cooling fabric based on phase change materials. The continuously cooling fabric based on phase change materials described in this embodiment is prepared by the following method: (1) Yarn preparation: PCM nylon with a specification of 40D / 36F is placed in the workshop environment for 24 hours, and then it is filament-dried with ordinary FDY nylon with a specification of 40D / 24F to form a composite yarn with a specification of 80D / 60F. The mass percentage of PCM nylon in the composite yarn is 50%. (2) Weaving: Select sharp, smooth, undamaged and deformed knitting needles, and interweave the composite yarn obtained in step (1) with spandex of specification 20D through a weft knitting circular knitting machine. The weaving speed is 12 revolutions / minute, the weaving temperature is 25℃ and the humidity is 60%, and the greige fabric is obtained. (3) Dyeing and finishing: The grease obtained in step (2) is first washed with water to remove oil. A neutral degreasing agent is added during the washing process. The washing temperature is 85℃ and the washing speed is 20 yards / minute. A ten-section setting machine is used for pre-setting. The pre-setting temperature is 190℃ and the pre-setting speed is 30 yards / minute. Then, the fabric is dyed and finished. The pH of the dyeing process is controlled at 4-6. The finished product is obtained and inspected to obtain the fabric. The dyeing process includes: mixing the greige fabric with dyeing agent and dyeing auxiliaries, heating and dyeing, then cooling and performing soaping, hot water washing and cold water washing, and finally dehydration; The dyeing auxiliaries include bath softener, high-temperature dispersing and leveling agent, repair agent and pH lubricant; The heating process includes heating to 40-60℃ at a rate of 0.5℃ / min and holding for 20 min; heating to 60-70℃ at a rate of 0.5℃ / min and holding for 30 min; heating to 70-80℃ at a rate of 0.5℃ / min and holding for 30 min; heating to 80-98℃ at a rate of 0.5℃ / min and holding for 40 min; and heating to 98-105℃ at a rate of 0.5℃ / min and holding for 30 min. The cooling process includes: cooling to 90-105°C at a rate of 0.5°C / min and holding for 20 minutes, then cooling to 70-90°C at a rate of 1°C / min; The soaping process uses a nonionic surfactant, the soaping temperature is 80℃, and the soaping time is 20 minutes. The hot water wash temperature is 60℃, and the hot water wash time is 10 minutes; The temperature of the cold water wash is 35°C, and the cold water wash time is 10 minutes. Antioxidants, hand feel modifiers, and moisture-absorbing and quick-drying agents are added during the finishing process. The finishing temperature is 165℃, and the finishing speed is 25 yards / minute.

[0065] Example 2 An embodiment of the present invention is a continuously cooling fabric based on phase change materials. The continuously cooling fabric based on phase change materials described in this embodiment is prepared by the following method: (1) Yarn preparation: PCM nylon with a specification of 40D / 36F is placed in the workshop environment for 12 hours, and then it is filament-dried with ordinary FDY nylon with a specification of 40D / 24F to form a composite yarn with a specification of 80D / 60F. The mass percentage of PCM nylon in the composite yarn is 40%. (2) Weaving: Select sharp, smooth, undamaged and deformed knitting needles, and interweave the composite yarn obtained in step (1) with 20D spandex through a weft knitting circular knitting machine. The weaving speed is 10 revolutions / minute, the weaving temperature is 20℃ and the humidity is 70%, and the greige fabric is obtained. (3) Dyeing and finishing: The grease obtained in step (2) is first washed with water to remove oil. A neutral degreasing agent is added during the washing process. The washing temperature is 80℃ and the washing speed is 25 yards / min. A ten-section setting machine is used for pre-setting. The pre-setting temperature is 205℃ and the pre-setting speed is 10 yards / min. Then, the fabric is dyed and finished. The pH of the dyeing process is controlled at 4-6. The finished product is obtained and inspected to obtain the fabric. The dyeing process includes: mixing the greige fabric with dyeing agent and dyeing auxiliaries, heating and dyeing, then cooling and performing soaping, hot water washing and cold water washing, and finally dehydration; The dyeing auxiliaries include bath softener, high-temperature dispersing and leveling agent, repair agent and pH lubricant; The heating process includes heating to 40-60℃ at a rate of 0.5℃ / min and holding for 20 min; heating to 60-70℃ at a rate of 0.5℃ / min and holding for 30 min; heating to 70-80℃ at a rate of 0.5℃ / min and holding for 30 min; heating to 80-98℃ at a rate of 0.5℃ / min and holding for 40 min; and heating to 98-105℃ at a rate of 0.5℃ / min and holding for 30 min. The cooling process includes: cooling to 90-105°C at a rate of 0.5°C / min and holding for 20 minutes, then cooling to 70-90°C at a rate of 1°C / min; The soaping process uses a nonionic surfactant, the soaping temperature is 70℃, and the soaping time is 30 minutes. The hot water wash temperature is 70℃, and the hot water wash time is 5 minutes; The temperature of the cold water wash is 40°C, and the cold water wash time is 5 minutes. Antioxidants, hand feel modifiers, and moisture-absorbing and quick-drying agents are added to the finished product during the shaping process. The shaping temperature is 160℃, and the shaping speed is 30 yards / minute.

[0066] Example 3 An embodiment of the present invention is a continuously cooling fabric based on phase change materials. The continuously cooling fabric based on phase change materials described in this embodiment is prepared by the following method: (1) Yarn preparation: PCM nylon with a specification of 40D / 36F is placed in the workshop environment for 48 hours, and then it is filament-dried with ordinary FDY nylon with a specification of 40D / 24F to form a composite yarn with a specification of 80D / 60F. The mass percentage of PCM nylon in the composite yarn is 45%. (2) Weaving: Select sharp, smooth, undamaged and deformed knitting needles, interweave the composite yarn obtained in step (1) with spandex through a weft knitting circular knitting machine, the weaving speed is 8 revolutions / minute, the weaving temperature is 22℃ and the humidity is 65%, and the greige fabric is obtained. (3) Dyeing and finishing: The grease obtained in step (2) is first washed with water to remove oil. A neutral degreasing agent is added during the washing process. The washing temperature is 82℃ and the washing speed is 30 yards / minute. A ten-section setting machine is used for pre-setting. The pre-setting temperature is 195℃ and the pre-setting speed is 15 yards / minute. Then, the fabric is dyed and finished. The pH of the dyeing process is controlled at 4-6. The finished product is obtained and inspected to obtain the fabric. The dyeing process includes: mixing the greige fabric with dyeing agent and dyeing auxiliaries, heating and dyeing, then cooling and performing soaping, hot water washing and cold water washing, and finally dehydration; The dyeing auxiliaries include bath softener, high-temperature dispersing and leveling agent, repair agent and pH lubricant; The heating process includes heating to 40-60℃ at a rate of 0.5℃ / min and holding for 20 min; heating to 60-70℃ at a rate of 0.5℃ / min and holding for 30 min; heating to 70-80℃ at a rate of 0.5℃ / min and holding for 30 min; heating to 80-98℃ at a rate of 0.5℃ / min and holding for 40 min; and heating to 98-105℃ at a rate of 0.5℃ / min and holding for 30 min. The cooling process includes: cooling to 90-105°C at a rate of 0.5°C / min and holding for 20 minutes, then cooling to 70-90°C at a rate of 1°C / min; The soaping process uses a nonionic surfactant, the soaping temperature is 90℃, and the soaping time is 10 minutes. The hot water wash temperature is 50℃, and the hot water wash time is 15 minutes; The temperature of the cold water wash is 30°C, and the cold water wash time is 15 minutes. Antioxidants, hand feel modifiers, and moisture-absorbing and quick-drying agents are added to the finished product during the shaping process. The shaping temperature is 170℃, and the shaping speed is 20 yards / minute.

[0067] Example 1: Test on the temperature rise effect of the continuous cooling fabric based on phase change material according to the present invention. The test object for this example is: Test product: The continuous cooling fabric based on phase change material prepared in Example 1; Comparison product: 160gsm (grams per square meter) nylon-spandex fabric (conventional nylon-spandex fabric, without PCM phase change function).

[0068] The testing method includes the following steps: (1) Sample pretreatment: Cut the test sample and the control sample fabric into samples of the same specifications, adjust the weight of the samples to be consistent, roll them into rolls and ensure that the rolls are dense and uniform. (2) Environment settings: Two temperature change scenarios were set up, namely 10℃→35℃ (heating scenario) and 35℃→10℃ (cooling scenario), to simulate the dynamic changes in ambient temperature; (3) Data acquisition: Under two temperature scenarios, the real-time temperature of the test sample and the control sample is continuously recorded according to the time gradient (0-30 minutes), and the temperature difference between the two is calculated (ΔT=test sample temperature-control sample temperature). (4) Test surface selection: The fabric surface is used as the test surface to ensure consistent test conditions.

[0069] The test results are presented in the form of "time-temperature-temperature difference", as detailed in Table 1 and Appendix 2 below. Figure 1-2 As shown.

[0070] Table 1. Temperature rise test results for the test sample and the control sample. From Table 1 and Appendix Figure 2-3 The results show that in the heating scenario (10℃→35℃): the test sample remained at a lower temperature than the control sample, with a temperature difference between -0.3℃ and -3.8℃ within 0-30 minutes. The temperature difference reached its maximum (-3.8℃) between 14-16 minutes, and was -3.0℃ at 20 minutes, demonstrating that the test sample could achieve cooling buffering through PCM phase change heat absorption during the heating process. In the cooling scenario (35℃→10℃): the test sample remained at a higher temperature than the control sample, with a temperature difference between -0.3℃ and 5.5℃ within 0-30 minutes. The temperature difference reached its maximum (5.5℃) between 6-7 minutes, and was 1.6℃ at 20 minutes, indicating that the test sample could buffer the temperature drop through PCM phase change heat release during the cooling process. Therefore, it can be concluded that the test sample can consistently regulate its temperature through phase change characteristics within a 0-30 minute temperature change cycle, forming a stable temperature difference with the control sample, proving its continuous cooling effect.

[0071] Example 2 The present invention provides test results of the cooling value of a continuous cooling fabric based on phase change materials. The continuously cooling fabric based on phase change material prepared in Example 1 was selected as test sample 1, as detailed in the attached document. Figure 3 As shown; The fabric of test sample 2 differs from that of Example 1 only in the mass percentage of PCM nylon in the composite yarn. In the control fabric, the mass percentage of PCM nylon in the composite yarn is 40%, and the rest is the same as that of Example 1.

[0072] The fabric of control sample 1 differs from that of example 1 only in the mass percentage of PCM nylon in the composite yarn. In the control sample fabric, the mass percentage of PCM nylon in the composite yarn is 35%. Everything else is the same as in example 1.

[0073] The fabric of control sample 2 differs from that of example 1 only in the mass percentage of PCM nylon in the composite yarn. In the control sample fabric, the mass percentage of PCM nylon in the composite yarn is 55%. Everything else is the same as in example 1.

[0074] Prepare samples that meet the requirements of JISL1927:2020 according to SGS testing specifications, ensuring that the sample surface is free of damage, stains, and wrinkles, and that the test surface is the front side of the fabric.

[0075] The specific testing method is as follows: Test environment calibration: Control the test environment to standard conditions: temperature 20±2℃, relative humidity 65±4%RH, and ensure that the environmental parameters are stable before carrying out the test.

[0076] Test parameter settings: Set the temperature difference ΔT=20℃ according to the standard requirements, and use the test method specified in JISL1927:2020 to test the heat flux density (Qmax value) of the fabric. This index directly reflects the intensity of the cooling sensation when the fabric comes into contact with the skin.

[0077] Data acquisition and judgment: Start the test equipment, record the heat flux density value when the fabric comes into contact with the test probe, and directly read the valid test results. The specific test results are shown in Table 2.

[0078] Table 2. Test results of Qmax (heat flux density) of the continuous cooling fabric based on phase change material of this invention. Qmax is measured in watts per square centimeter (W / cm²). The higher the value, the higher the heat transfer efficiency when the fabric comes into contact with the skin, and the more obvious and stronger the cooling sensation felt by the human body.

[0079] As shown in Table 2, the fabric prepared in this application, tested according to JIS L1927:2020 (revised) standard, has a cooling value Qmax of 0.505 W / cm². 2 The value of PCM nylon in the composite yarn is much higher than that of control product 1, indicating that when the mass percentage of PCM nylon in the composite yarn is less than 40%, the initial cooling sensation of the fabric decreases significantly. However, when the mass percentage of PCM nylon in the composite yarn is higher than 50%, it does not significantly improve the initial cooling sensation of the fabric, but instead leads to a significant increase in cost.

[0080] Example 3 This invention relates to an air permeability test of a continuously cooling fabric based on phase change materials. The test groups for this example are as follows: Test samples 1-3: These are the continuous cooling fabrics based on phase change materials prepared in Examples 1-3, respectively; Comparative Sample 1: Compared with Example 1, the only difference is the composition of the composite yarn. In this comparative sample, the 40D PCM nylon and 40D ordinary nylon in Example 1 were replaced with 50D PCM nylon and 50D ordinary nylon, respectively, and the yarn was 100D / 60F composite yarn. Everything else was the same as in Example 1.

[0081] Comparative Sample 2: The 20D spandex in Example 1 was replaced with 40D spandex, and everything else was the same as in Example 1.

[0082] Comparative Sample 3: The 40D / 36F PCM nylon in Example 1 was replaced with 40D / 12F PCM nylon, and the yarn was filament-dried as a composite yarn with a specification of 80D / 36F.

[0083] Comparative Sample 4: The composite yarn in Example 1 was directly made of pure PCM nylon with a specification of 80D / 60F.

[0084] Each group of samples must be free from damage, wrinkles, and stains, and cut into specimens suitable for the testing equipment according to the requirements of ISO9237:1995 standard, with specimen specifications matching the test area requirements.

[0085] The specific testing method is as follows: Test equipment and parameter calibration: The test was conducted in accordance with the ISO9237:1995 standard. The air permeability test equipment was debugged, the test area was set to 20cm² and the test pressure difference to 100Pa, and the test was carried out after ensuring that the equipment was in stable operating condition.

[0086] Formal testing: The prepared fabric sample was fixed on the test platform of the testing equipment, the equipment was started, and the volume of air passing through a unit area of ​​fabric per unit time under the specified pressure difference was measured. The air permeability of the fabric was calculated accordingly. The test results of each group are shown in Table 3.

[0087] Table 3. Results of air permeability test for each group of samples. As shown in Table 3, the air permeability of all tested samples reached 200 mm / s, significantly higher than that of the control samples. In control sample 1, replacing fine denier fibers with coarse denier fibers increased the overall yarn diameter, significantly compressed the spacing between filaments and the gaps between yarns, significantly increased airflow resistance, and significantly decreased air permeability. In control sample 2, replacing 20D spandex with 40D spandex increased the proportion of spandex interweaving, partially blocking the gaps between fabric loops with coarse denier spandex, disrupting the loose and breathable structure of the single-sided elastic jersey fabric, and resulting in a significant decrease in air permeability compared to test sample 1. In control sample 3, replacing 40D / 36F with 40D / 12F reduced the total number of holes in the composite yarn from 60F to 36F, increased the filament diameter, decreased the yarn specific surface area, and significantly reduced the internal air permeability channels, leading to a decrease in airflow efficiency, and a significant decrease in air permeability compared to test sample 1. In comparison, sample 4, which uses a single strand of 80D / 60F pure PCM nylon, has a high density structure, and the air permeability gaps between the yarns are compressed, showing a significant decrease compared to test sample 1.

[0088] Example of effect 4 This invention relates to the enthalpy test of a continuously cooling fabric based on phase change materials. This example uses test sample A and control sample B as the test subjects, as detailed below: Test Item A: The continuous cooling fabric based on phase change material prepared using Example 1 of this application.

[0089] Comparative product B: The only difference between this product and test product A is that it does not contain the PCM nylon found in test product A. That is, test product B is prepared by omitting step (1) of Example 1 and directly using ordinary FDY nylon with a specification of 80D / 60F and spandex with a specification of 20D through steps (2) and (3) of Example 1. All process conditions in the preparation process are the same.

[0090] First, the odor of test sample A was tested using the method specified in Clause 6.7 of GB18401-2010 to determine whether the fabric had any odor. The test results showed that test sample A had no odor and met the relevant standard requirements.

[0091] Then, the phase change characteristics of test sample A and reference sample B were tested according to GB / T43820-2024. Specifically, differential scanning calorimetry (DSC) was used to detect the phase change parameters. The test procedure is as follows: (1) After the sample is loaded onto the machine, it is heated to 70°C at a heating rate of 5°C / min and kept at the temperature for 5min; (2) Cool to -20℃ at a cooling rate of 5℃ / min and hold at that temperature for 5min; (3) Heat again to 70°C at a heating rate of 5°C / min and hold at that temperature for 5 min; (4) Finally, cool to -10℃ at a cooling rate of 5℃ / min, record the DSC curve throughout the process, and extract the melting and crystallization related temperature and enthalpy data.

[0092] To verify the reliability of the test results and the uniformity of the fabric's phase change properties, test sample A and control sample B were subjected to three repeated DSC tests. The test results are shown in the attached figures. Figure 4 and 5 As shown.

[0093] Appendix Figure 4 In Figure A, double melting peaks (19.59℃, 29.94℃) and double crystallization peaks (25.41℃, 10.92℃) are shown, with the peak areas corresponding to the enthalpy of fusion (-18.54J / g, 17.63J / g) and the peak areas corresponding to the enthalpy of crystallization marked. The extrapolated onset / terminus melting temperatures (17.85℃, 31.81℃) and extrapolated onset / terminus crystallization temperatures (27.19℃, 8.91℃) are also visible. Figure B shows melting peaks (19.59℃, 30.01℃) and crystallization peaks (25.40℃, 10.88℃), which highly overlap with Figure A. The peak areas of the enthalpy of fusion (-19.76J / g, 18.68J / g), the peak areas of the enthalpy of crystallization, and the temperature thresholds deviate very little from Figure A, corresponding to the extrapolated onset / terminus temperatures (17.88℃, 31.79℃; 27.18℃, 8.97℃). Figure C shows that the melting peak (19.83℃, 30.14℃) and crystallization peak (25.00℃, 10.69℃) remain stable. The melting enthalpy peak area (-19.42J / g, 18.39J / g) and the extrapolated temperature range (17.94℃, 32.42℃; 27.12℃, 8.53℃) are highly consistent with Figures A and B, further demonstrating the repeatability of the data. Therefore, the DSC curves from the three repeated tests highly overlap, with the temperature deviation of the melting and crystallization peaks ≤0.5℃ and the peak area deviation of the melting and crystallization enthalpies ≤1.5J / g, proving that the fabric prepared in this application has uniform and stable phase change properties. Furthermore, the melting enthalpy ≥18J / g and the crystallization enthalpy ≥19J / g can be directly calculated from the peak area, proving that the fabric per unit mass can absorb / release sufficient latent heat, exhibiting excellent and continuous cooling effect, and demonstrating stable heat absorption and release capabilities without enthalpy decay.

[0094] Figure 5 In the AC graphs, the results are highly consistent, showing that the reference sample B is a flat curve with no obvious peaks. No melting peaks or crystallization peaks are formed in the entire detection range, and there are no significant changes in the area of ​​the endothermic and exothermic peaks, nor is there any phase transition function.

[0095] From the appendix Figure 4 and 5The comparison shows that test sample A (the continuous cooling fabric based on phase change material of this invention) clearly displays two melting peaks (approximately 19.6~19.8℃, 29.9~30.1℃) and two crystallization peaks (approximately 10.7~10.9℃, 25.0~25.4℃), corresponding to a phase change temperature range of 17.8~32.4℃, which precisely corresponds to the comfortable temperature range of the human body surface (23~33℃). It can achieve stepwise heat absorption and release in different temperature ranges, avoiding the interruption of cooling sensation caused by a single phase change peak, and achieving continuous temperature buffering across the entire temperature range. In contrast, comparison sample B, which does not contain PCM nylon, has no melting or crystallization characteristic peaks and no significant changes in heat absorption and release. Therefore, it can be seen that the addition of PCM nylon is the only core factor that enables the fabric of this application to have phase change temperature control capability, and the weaving and dyeing process of this application does not damage the phase change characteristics of PCM nylon, thus achieving complete preservation of phase change performance.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A continuously cooling fabric based on phase change materials, characterized in that, The fabric is made of composite yarn interwoven with spandex; The composite yarn comprises PCM nylon and ordinary FDY nylon, wherein the mass percentage of PCM nylon in the composite yarn is not higher than 50%. The composite yarn has a specification of 80D / 60F, and the spandex has a specification of 20D.

2. The continuously cooling fabric based on phase change materials as described in claim 1, characterized in that, The PCM nylon has a specification of 40D / 36F and a phase transition temperature range of 23-33℃.

3. The continuously cooling fabric based on phase change materials as described in claim 1 or 2, characterized in that, The PCM nylon has a mass percentage content of 40-50% in the composite yarn.

4. The continuously cooling fabric based on phase change materials as described in claim 1, characterized in that, The specifications of the ordinary FDY nylon are 40D / 24F.

5. The continuously cooling fabric based on phase change materials as described in claim 1, characterized in that, The fabric is a single-sided elastic jersey fabric. And / or, the phase transition temperature range of the fabric is 17.9-32.0℃; And / or, the enthalpy of melting of the fabric is ≥18 J / g; And / or, the enthalpy of crystallization of the fabric is ≥19 J / g; And / or, the fabric has a Qmax value ≥ 0.5 W / cm² as tested according to JIS L 1927:2020 standard; And / or, the fabric has an air permeability of ≥200mm / s as tested according to ISO 9237:1995 standard.

6. A method for preparing a continuously cooling fabric based on a phase change material as described in any one of claims 1-5, characterized in that, The method includes the following steps: (1) Yarn preparation: PCM nylon and ordinary FDY nylon are filament-coated to form composite yarn; (2) Weaving: The composite yarn obtained in step (1) is interwoven with spandex through a weft knitting circular knitting machine at a weaving speed of ≤12 rpm to obtain the greige fabric; (3) Dyeing and finishing: The grease fabric obtained in step (2) is first washed with water to remove oil and pre-shaped, then dyed and finished product shaping is carried out. The pH of the dyeing process is controlled at 4-6. The finished product is obtained and inspected to obtain the fabric.

7. The method for preparing a continuously cooling fabric based on phase change materials as described in claim 6, characterized in that, Before the PCM nylon and ordinary FDY nylon are filament-spun together in step (1), the PCM nylon is placed in the workshop environment for 12-48 hours. And / or, the weaving temperature in step (2) is 20-25℃ and the humidity is 60-70%; And / or, in step (3), a neutral degreasing agent is added during the water washing and degreasing process, the water washing temperature is 80-85℃, and the water washing speed is 20-30 yards / minute; And / or, in step (3), the pre-forming process uses a ten-section pre-forming machine, the pre-forming temperature is 190-205℃, and the pre-forming speed is 10-30 yards / minute; And / or, the dyeing in step (3) includes: mixing the greige fabric with dyeing agent and dyeing auxiliaries and heating to dye, then cooling and performing soaping, hot water washing and cold water washing, and then dehydration; And / or, in step (3), the finished product setting temperature is 160-170℃, the finished product setting speed is 20-30 yards / minute, and antioxidants, hand feel adjustment agents and moisture-absorbing and quick-drying agents are added during the finished product setting process.

8. The method for preparing a continuously cooling fabric based on phase change materials as described in claim 7, characterized in that, In step (3), the dyeing auxiliaries used in the dyeing process include bath softener, high-temperature dispersing and leveling agent, repair agent and pH lubricant; And / or, in step (3), the dyeing process first slowly adds the dyeing agent and dyeing auxiliary agent to the fabric and runs it for 10-30 minutes, gradually raising the temperature to 98-105℃ at a rate of 0.5℃ / min, and keeping it warm for a total of 120-180min; And / or, the cooling process in step (3) during the staining process adopts a staged cooling method, and finally the temperature is reduced to 70-90℃; And / or, in step (3), the soaping process in the dyeing process uses a nonionic surfactant, the soaping temperature is 70-90℃, and the soaping time is 10-30 minutes; And / or, the temperature of the hot water wash during the dyeing process in step (3) is 50-70℃, and the hot water wash time is 5-15min; And / or, the cold water washing temperature in the staining process of step (3) is 30-40℃ and the cold water washing time is 5-15min.

9. The method for preparing a continuously cooling fabric based on phase change materials as described in claim 8, characterized in that, The temperature increase during the staining process in step (3) includes: increasing the temperature to 40-60℃ at a rate of 0.5℃ / min and holding for 20min; increasing the temperature to 60-70℃ at a rate of 0.5℃ / min and holding for 30min; increasing the temperature to 70-80℃ at a rate of 0.5℃ / min and holding for 30min; increasing the temperature to 80-98℃ at a rate of 0.5℃ / min and holding for 40min; and increasing the temperature to 98-105℃ at a rate of 0.5℃ / min and holding for 30min. And / or, the cooling process in step (3) of the staining process includes: cooling to 90-105℃ at 0.5℃ / min and holding for 20min, and then cooling to 70-90℃ at 1℃ / min.

10. The application of the continuous cooling fabric based on phase change material as described in any one of claims 1-5 in clothing and / or home textiles.

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