Temperature-regulating and sweat-discharging material and application thereof in fiber and flocculus

Abstract

The invention belongs to the technical field of temperature-regulating and sweat-discharging materials, and particularly relates to a temperature-regulating and sweat-discharging material and application thereof in fibers and flocculus. The preparation method of the temperature-regulating and sweat-discharging material comprises the steps of surface modification of inorganic nanoparticles, preparation of a shell material solution, preparation of a core material solution and preparation of the temperature-regulating and sweat-discharging material. Finally, the phase-change microcapsule, namely the temperature-regulating and sweat-discharging material, which takes the phase-change material as a core and takes the composite material of the cross-linked polyvinylpyrrolidone / 2-acrylic acid-2-[[(butylamino)-carbonyl] oxo] ethyl ester copolymer doped with the inorganic nanoparticles as a shell is obtained. The temperature-regulating and sweat-discharging material is high in thermal conductivity and good in washable effect, can be added into a fiber matrix before spinning, can be used for preparing filling flocculus, and can be prepared into coating liquid to form a coating on the surface of a fabric in forms of hot rolling, spraying and the like; the fabric has potential application value in multiple fields such as work clothes, firefighter uniform, warmth retention articles, bedding articles, sportswear, shoes and hats and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature-regulating and sweat-evaporating materials, and particularly relates to a temperature-regulating and sweat-evaporating material and its application in fibers and waddings. Background Art

[0002] With the continuous development of modern technology and the increasing requirements of people for the quality of life and the performance of various textile products, it is statistically shown that the market size of high-performance fibers in China reached 45 billion yuan in 2023, and the global market size of high-performance fibers reached 131.917 billion yuan. It is predicted that the global market size of high-performance fibers will reach 238.983 billion yuan in 2029. Fibers with temperature-regulating functions are an important category of high-performance fibers, and consumers' demand for textiles that can achieve temperature regulation functions is becoming increasingly urgent.

[0003] Commercially available fibers with temperature-regulating functions generally have the following problems: (1) Limited temperature-regulating range: Common phase change materials have relatively fixed and narrow phase change temperatures, making it difficult to meet the requirements of complex and variable actual environmental temperatures. For example, a certain phase change material suitable for winter indoor insulation has its phase change temperature set at 20 - 22°C. When the indoor temperature fluctuates outside this range, its temperature-regulating effect will be greatly reduced and it cannot effectively function in high-temperature environments in summer (such as above 30°C) or extremely cold winters (such as below 0°C).

[0004] (2) Low thermal conductivity: Most phase change materials themselves have poor thermal conductivity, which means that the transfer speed inside the material is slow, resulting in a slow process of absorbing or releasing heat, and thus affecting the timeliness and effectiveness of temperature regulation. In practical applications, it may occur that the environmental temperature has changed significantly, but the phase change material has not completed heat exchange in time, resulting in obvious temperature-regulation lag.

[0005] (3) Stability problems: After multiple phase change cycles, problems such as phase separation and leakage may occur in terms of stability, thus reducing its temperature-regulating performance. For example, during the long-term use of some phase change materials, due to the density difference between different phases and the compatibility problem between the material and the carrier, phase separation is likely to occur, making the originally uniformly distributed phase change material unable to normally exert its temperature-regulating function.

[0006] In the prior art, composite technologies are used to composite phase change materials with high-thermal-conductivity materials such as graphene and carbon nanotubes to improve their thermal conductivity; the formulation and loading process of phase change materials are also optimized to improve their stability to a certain extent; the emergence of new temperature-regulating materials can change their molecular structure or physical state according to the change of environmental temperature, so as to achieve the function of temperature regulation.

[0007] Although certain progress has been made in the above technologies, there are still some problems with temperature-regulating materials in the textile field. For example, while improving the thermal conductivity, it is difficult to balance other properties such as the latent heat of phase change and stability; the temperature regulation range is not wide enough, and the sensitivity to temperature changes is poor, unable to meet some application scenarios with precise temperature regulation requirements; the wash resistance is poor, and the temperature regulation function is greatly reduced after multiple washes. Summary of the Invention

[0008] To solve the problems existing in the prior art, the present invention provides a temperature-regulating and sweat-wicking material and its application in fibers and waddings, achieving the following invention purposes: Improve the stability of the phase change material, make the temperature regulation more precise, and at the same time endow textiles with multiple functions such as temperature regulation, sweat wicking and moisture conduction, meeting the needs of multiple fields.

[0009] Improve the thermal conductivity, mechanical strength and compatibility with fiber substrates of the temperature-regulating and sweat-wicking material, and ensure the wash resistance effect.

[0010] To solve the above technical problems, the present invention adopts the following technical solutions: One of the purposes of the present invention is to provide a temperature-regulating and sweat-wicking material, and the preparation method of the temperature-regulating and sweat-wicking material includes the following steps: S1. Surface modification of inorganic nanoparticles Add inorganic nanoparticles to absolute ethanol and ultrasonically disperse for 5 - 10 min, add a silane coupling agent and mix evenly, after reacting for 6 - 8 h, centrifuge, wash and dry to obtain modified inorganic nanoparticles.

[0011] Preferably, the inorganic nanoparticles are one or more of graphene, titanium dioxide, boron nitride, and carbon nanotubes.

[0012] Furthermore, the particle size of the inorganic nanoparticles is 4 - 10 nm.

[0013] Preferably, the silane coupling agent is KH570, and the addition amount is 13 - 20% of the mass of the inorganic nanoparticles.

[0014] S2. Preparation of the shell material solution Add N-vinylpyrrolidone, 2-acryloyloxyethyl N,N-dimethylcarbamate, and modified inorganic nanoparticles to absolute ethanol and stir for 20 - 30 min, then add an initiator and a crosslinking agent and continue to stir for 5 - 10 min, with a stirring rate of 200 - 300 r / min, to obtain the shell material solution.

[0015] Preferably, the mass ratio of N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, modified inorganic nanoparticles and absolute ethanol is 10-14:4-6:1.2-1.6:70-80.

[0016] Preferably, the initiator is azobisisobutyronitrile, and the addition amount is 1.3-1.8% of the mass of N-vinylpyrrolidone.

[0017] Preferably, the crosslinking agent is N,N ， -methylenebisacrylamide, and the addition amount is 2-3% of the mass of N-vinylpyrrolidone.

[0018] S3. Preparation of core material solution Add the phase change material and emulsifier to deionized water, and use a constant temperature magnetic stirrer to stir at a stirring rate of 800-1000 r / min at 40-50 °C for 20-30 min to obtain the core material solution.

[0019] Preferably, the phase change material is one or more of n-octadecane, paraffin, palmitic acid and its esters, fatty acids and their esters, pentaerythritol, and trimethylolethane.

[0020] Preferably, the emulsifier is one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, span 80, and tween 80.

[0021] Preferably, the mass ratio of the phase change material, emulsifier and deionized water is 20-26:4-7:60-70.

[0022] S4. Preparation of temperature-regulating and sweat-evaporating material While stirring the core material solution at a stirring rate of 600-700 r / min, add the shell material solution to the core material solution, then raise the temperature to 65-75 °C, and react for 6-7 h under nitrogen protection to obtain a phase change microcapsule suspension with the phase change material as the core and the composite material of crosslinked polyvinylpyrrolidone / 2-acryloyloxyethyl N-butylcarbamate copolymer doped with inorganic nanoparticles as the shell. After suction filtration, washing with ethanol solution, drying, and grinding, the temperature-regulating and sweat-evaporating material is obtained.

[0023] Preferably, the volume ratio of the core material solution and the shell material solution is 1-1.1:1.3-1.7.

[0024] Preferably, the drying temperature is 60-80 °C, and the drying time is 12-24 h.

[0025] In order to improve the problems of easy loss and leakage of phase change materials, the phase change materials are encapsulated with polymer materials to form a microcapsule structure. However, the traditional polymer shell materials have poor thermal conductivity, insufficient mechanical strength, and poor binding ability with fibers. When applied to the fiber field, long-term washing will cause the shedding and breakage of microcapsules, affecting the temperature regulation ability of the fibers. Therefore, the shell material of the present invention is a composite material of cross-linked polyvinylpyrrolidone / 2-acryloyloxyethyl N-butylcarbamate copolymer doped with inorganic nanoparticles.

[0026] Adding inorganic nanoparticles to the shell material can improve the thermal conductivity of the shell material. However, directly adding inorganic nanoparticles to the shell material is only a simple physical binding force, and the combination of the two is not firm, and the inorganic nanoparticles are easy to fall off. Therefore, KH570 is first used to modify the inorganic nanoparticles, and carbon-carbon double bonds are modified on the surface of the inorganic nanoparticles to obtain modified inorganic nanoparticles. The modified inorganic nanoparticles can participate in the free radical polymerization reaction of the shell material and be doped in the shell material in the form of covalent bonds, improving the thermal conductivity stability and recycling rate of the microcapsules.

[0027] The temperature-regulating and sweat-releasing material made of cross-linked polyvinylpyrrolidone as the shell material can form a dense protective layer for the core material. Moreover, cross-linked polyvinylpyrrolidone has good compatibility with the substrate and good hygroscopicity, which can improve the moisture absorption and sweat release effect of fibers, flocs or coatings to a certain extent. However, cross-linked polyvinylpyrrolidone contains a rigid pyrrole ring, which makes the shell material have high rigidity and strong stability while having poor flexibility and being prone to brittle rupture. The doping of inorganic nanoparticles also results in insufficient flexibility of the shell material. Although adding it to the fibers has little effect on the strength of the fibers, the shell material is prone to rupture during long-term washing, causing the loss of phase change materials. Therefore, 2-acryloyloxyethyl N-butylcarbamate copolymer containing flexible segments is added to slow down or avoid the washing rupture of the temperature-regulating and sweat-releasing material and enhance its wash resistance.

[0028] The second object of the present invention is to provide an application of a temperature-regulating and sweat-releasing material in fibers and flocs, and the application includes adding it to the fiber matrix in the form of pre-spinning addition; being used for the preparation of filled flocs; being made into a coating solution to form a coating on the fabric surface by hot rolling, spraying, etc.

[0029] Preferably, the fiber matrix includes but is not limited to one of polyester, nylon, acrylic, polypropylene, spandex, lyocell fiber, and viscose fiber.

[0030] Preferably, the fabric includes but is not limited to one of non-woven fabric, nylon-ammonia fabric, and polyester-ammonia fabric.

[0031] Due to the adoption of the above technical solutions, the technical effects achieved by the present invention are: 1. The temperature-regulating and sweat-wicking material prepared by the present invention has good compatibility and dispersibility, and has potential application value in multiple fields such as work clothes, fire-fighting clothes, warm-keeping products, bedding, sports clothes, shoes and hats.

[0032] 2. The temperature-regulating and sweat-wicking material prepared by the present invention has good thermal conductivity, and the thermal conductivity is 1.36 - 1.54 W / (m·K).

[0033] 3. The temperature-regulating and sweat-wicking material prepared by the present invention has good compatibility with various fiber matrices. It is introduced into the fiber matrix by the method of adding before spinning. The obtained fibers and fabrics have the functions of sweat-wicking and moisture-conducting, and have good temperature-regulating performance. Especially in the environment where the room temperature quickly drops below 0°C from about 25°C, it has good temperature response ability and plays a role in buffering and regulating temperature, making the human body feel more comfortable when facing the environment with sudden temperature changes.

[0034] 4. The temperature-regulating and sweat-wicking material prepared by the present invention is made into a coating solution and applied to the fabric surface in forms such as hot rolling and spraying. After drying and post-treatment, a coating is formed on the fabric surface, minimizing the influence of the coating on the hand feeling and mechanical properties of the fabric, and is applicable to textiles that precisely achieve the temperature-regulating effect, such as summer cool-sensation fabrics, blankets, etc.

[0035] 5. Adding the temperature-regulating and sweat-wicking material to fibers and batting can improve its heat preservation ability. For example, adding the temperature-regulating and sweat-wicking material to the filling batting, the heat preservation rate reaches more than 80% (detected in accordance with GB / T 35762-2017). BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shows the temperature-regulating situation of the filling batting (initial temperature 10°C) prepared in Example 1 and the ordinary batting (initial temperature 10°C) purchased on the market placed in a 40°C environment; Figure 2 Shows the temperature-regulating situation of the filling batting (initial temperature 40°C) prepared in Example 1 and the ordinary batting (initial temperature 40°C) purchased on the market placed in a 10°C environment. DETAILED DESCRIPTION OF THE INVENTION

[0037] The present invention will be further described below in conjunction with specific embodiments.

[0038] Example 1: A temperature-regulating and sweat-wicking material and its application in fibers and batting. The preparation of the temperature-regulating and sweat-wicking material includes the following steps: S1. Surface modification of inorganic nanoparticles Add inorganic nanoparticles to absolute ethanol and ultrasonically disperse for 8 min, add a silane coupling agent and mix evenly. After reacting for 7 h, centrifuge, wash, and dry to obtain modified inorganic nanoparticles.

[0039] The inorganic nanoparticles are graphene with a particle size of 7 nm.

[0040] The silane coupling agent is KH570, and the addition amount is 15% of the mass of the inorganic nanoparticles.

[0041] S2. Preparation of the shell material solution Add N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, and the modified inorganic nanoparticles to anhydrous ethanol and stir for 25 min, then add the initiator and crosslinking agent and continue stirring for 7 min. The stirring rate is 250 r / min to obtain the shell material solution.

[0042] The mass ratio of the N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, modified inorganic nanoparticles, and anhydrous ethanol is 12:5:1.5:75.

[0043] The initiator is azobisisobutyronitrile, and the addition amount is 1.5% of the mass of the N-vinylpyrrolidone.

[0044] The crosslinking agent is N,N ， -methylenebisacrylamide, and the addition amount is 2.5% of the mass of the N-vinylpyrrolidone.

[0045] S3. Preparation of the core material solution Add the phase change material and emulsifier to deionized water, and use a constant temperature magnetic stirrer to stir at a stirring rate of 900 r / min at 45 °C for 25 min to obtain the core material solution.

[0046] The phase change material is palmitic acid, and the emulsifier is sodium dodecylbenzenesulfonate.

[0047] The mass ratio of the phase change material, emulsifier, and deionized water is 24:6:65.

[0048] S4. Preparation of the temperature-regulating and sweat-evaporating material While stirring the core material solution at a stirring rate of 650 r / min, add the shell material solution to the core material solution, then raise the temperature to 70 °C and react for 6.5 h under nitrogen protection to obtain a phase change microcapsule suspension with the phase change material as the core and the composite material of crosslinked polyvinylpyrrolidone / 2-acryloyloxyethyl N-butylcarbamate copolymer doped with inorganic nanoparticles as the shell. After filtration, washing with 70% ethanol solution, drying, and grinding to 1 μm, the temperature-regulating and sweat-evaporating material is obtained.

[0049] The volume ratio of the core material solution to the shell material solution is 1.05:1.55.

[0050] The drying temperature is 70 °C, and the drying time is 20 h.

[0051] Example 2: A temperature-regulating and sweat-releasing material and its application in fibers and waddings. The preparation of the temperature-regulating and sweat-releasing material comprises the following steps: S1. Surface modification of inorganic nanoparticles Add the inorganic nanoparticles into absolute ethanol, ultrasonically disperse for 5 min, add the silane coupling agent, mix evenly, react for 6 h, then centrifuge, wash, and dry to obtain modified inorganic nanoparticles.

[0052] The inorganic nanoparticles are titanium dioxide with a particle size of 4 nm.

[0053] The silane coupling agent is KH570, and the addition amount is 13% of the mass of the inorganic nanoparticles.

[0054] S2. Preparation of the shell material solution Add N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, and the modified inorganic nanoparticles into absolute ethanol, stir for 20 min, then add the initiator and crosslinking agent, and continue stirring for 5 min. The stirring rate is 200 r / min to obtain the shell material solution.

[0055] The mass ratio of N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, the modified inorganic nanoparticles, and absolute ethanol is 10:4:1.2:70.

[0056] The initiator is azobisisobutyronitrile, and the addition amount is 1.3% of the mass of N-vinylpyrrolidone.

[0057] The crosslinking agent is N,N ， -methylenebisacrylamide, and the addition amount is 2% of the mass of N-vinylpyrrolidone.

[0058] S3. Preparation of the core material solution Add the phase change material and the emulsifier into deionized water, and use a constant-temperature magnetic stirrer to stir at a stirring rate of 800 r / min at 40 °C for 20 min to obtain the core material solution.

[0059] The phase change material is paraffin wax, and the emulsifier is Tween 80.

[0060] The mass ratio of the phase change material, the emulsifier, and deionized water is 20:4:60.

[0061] S4. Preparation of the temperature-regulating and sweat-releasing material While stirring the core material solution at a stirring rate of 600 r / min, the shell material solution was added to the core material solution, and then the temperature was raised to 65 °C. The reaction was carried out for 6 h under nitrogen protection to obtain a phase change microcapsule suspension with a phase change material as the core and a composite material of crosslinked polyvinylpyrrolidone doped with inorganic nanoparticles / 2-acryloyloxyethyl N-butylcarbamate copolymer as the shell. After suction filtration, washing with 70% ethanol solution, drying, and grinding to 1 μm, a temperature-regulating sweat-absorbing material was obtained.

[0062] The volume ratio of the core material solution to the shell material solution is 1:1.3.

[0063] The drying temperature is 80 °C, and the drying time is 12 h.

[0064] Example 3: A temperature-regulating sweat-absorbing material and its application in fibers and waddings. The preparation of the temperature-regulating sweat-absorbing material includes the following steps: S1. Surface modification of inorganic nanoparticles The inorganic nanoparticles were added to anhydrous ethanol and ultrasonically dispersed for 10 min, then a silane coupling agent was added and mixed evenly. After reacting for 8 h, centrifugation, washing, and drying were carried out to obtain modified inorganic nanoparticles.

[0065] The inorganic nanoparticles are boron nitride with a particle size of 10 nm.

[0066] The silane coupling agent is KH570, and the addition amount is 20% of the mass of the inorganic nanoparticles.

[0067] S2. Preparation of the shell material solution N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, and modified inorganic nanoparticles were added to anhydrous ethanol and stirred for 30 min, then an initiator and a crosslinking agent were added and stirred for another 10 min at a stirring rate of 300 r / min to obtain the shell material solution.

[0068] The mass ratio of N-vinylpyrrolidone, 2-acryloyloxyethyl N-butylcarbamate, modified inorganic nanoparticles, and anhydrous ethanol is 14:6:1.6:80.

[0069] The initiator is azobisisobutyronitrile, and the addition amount is 1.8% of the mass of N-vinylpyrrolidone.

[0070] The crosslinking agent is N,N ， -methylenebisacrylamide, and the addition amount is 3% of the mass of N-vinylpyrrolidone.

[0071] S3. Preparation of the core material solution Add the phase change material and emulsifier to deionized water, and use a constant temperature magnetic stirrer to stir at a stirring rate of 1000 r / min at 50 °C for 30 min to obtain the core material solution.

[0072] The phase change material is n-octadecane, and the emulsifier is sodium dodecyl sulfate.

[0073] The mass ratio of the phase change material, emulsifier and deionized water is 26:7:70.

[0074] S4. Preparation of temperature-regulating sweat-absorbing material While stirring the core material solution at a stirring rate of 700 r / min, add the shell material solution to the core material solution, then raise the temperature to 75 °C, and react for 7 h under nitrogen protection to obtain a phase change microcapsule suspension with the phase change material as the core and the composite material of crosslinked polyvinylpyrrolidone doped with inorganic nanoparticles / 2-acryloyloxyethyl N-butylcarbamate copolymer as the shell. After filtration, washing with 70% ethanol solution, drying, and grinding to 1 μm, the temperature-regulating sweat-absorbing material is obtained.

[0075] The volume ratio of the core material solution to the shell material solution is 1.1:1.7.

[0076] The drying temperature is 60 °C, and the drying time is 24 h.

[0077] Comparative Example 1 Select the representative Example 1, remove 2-acryloyloxyethyl N-butylcarbamate in S2, and the rest are the same as Example 1, which is used as Comparative Example 1.

[0078] Comparative Example 2 Select the representative Example 1, remove the S1 step, directly add unmodified inorganic nanoparticles in S2, and the rest are the same as Example 1, which is used as Comparative Example 2.

[0079] Comparative Example 3 Select the representative Example 1, remove the modified inorganic nanoparticles in S2, and the rest are the same as Example 1, which is used as Comparative Example 3.

[0080] Test the thermal conductivity of the temperature-regulating sweat-absorbing materials prepared in Examples 1-3 and Comparative Examples 1-3. The specific data are shown in Table 1.

[0081] Table 1 As can be seen from Table 1, the temperature-regulating and sweat-wicking materials prepared in Examples 1-3 have a high thermal conductivity, while that of Comparative Example 3 is low, indicating that the addition of inorganic nanoparticles significantly improves the thermal conductivity. The thermal conductivity of Comparative Example 2 is lower than that of Example 1 because the inorganic nanoparticles in Comparative Example 2 are unmodified and have poor dispersibility in the shell material, so the thermal conductivity decreases compared with Example 1.

[0082] Examples 1-3 and Comparative Examples 1-3 were respectively added to the spinning dope of Lyocell fiber in the form of pre-spinning addition, and temperature-regulating fibers were prepared by wet spinning. The temperature-regulating fibers were made into fabrics, and the mechanical properties of the fibers, the enthalpy value and sweat-wicking effect of the fabrics were tested. The specific results are shown in Table 2.

[0083] Table 2 Table 2 shows that the temperature-regulating and sweat-wicking materials prepared in Examples 1-3 have better compatibility with the fiber matrix. Therefore, the fibers prepared have good mechanical properties and excellent thermal conductivity and sweat-wicking functions. The temperature-regulating and sweat-wicking materials prepared in Comparative Example 1 did not add 2-acryloyloxyethyl N-butylcarbamate, and the reduction of the flexible segment led to a decrease in the breaking strength of the fiber; the inorganic nanoparticles in Comparative Example 2 are only physically combined with the shell material without the force of chemical bonds and are easily detached to form "impurities" during the fiber preparation process, so the mechanical properties of the fiber decreased significantly; inorganic nanoparticles were not added in Comparative Example 3, so the enthalpy value of the fiber is low and the sweat-wicking effect is also insufficient.

[0084] Note: The wetting time of the soaked surface, the water absorption rate of the soaked surface and the one-way transfer index were measured according to 《GB / T 21655.2-2019》.

[0085] Examples 1-3 and Comparative Examples 1-3 were added to the filling batt, and their heat preservation effects were tested. The specific results are shown in Table 3.

[0086] Table 3 As can be seen from Table 3, the temperature-regulating and sweat-wicking materials prepared in Examples 1-3 have good compatibility with the filling batt and good wash resistance; the temperature-regulating and sweat-wicking materials prepared in Comparative Example 1 did not add 2-acryloyloxyethyl N-butylcarbamate, and the reduction of the flexible segment led to a decrease in the heat preservation performance of the filling batt with washing. This is because the reduction of the flexible segment led to the easy rupture of the shell material of the temperature-regulating and sweat-wicking material, and the rupture of the shell material during washing led to a decrease in the heat preservation performance of the filling batt; the inorganic nanoparticles in the shell material of the temperature-regulating and sweat-wicking materials prepared in Comparative Example 2 are unevenly dispersed and easily detached, so the wash resistance is also poor; inorganic nanoparticles were not added in Comparative Example 3, so the overall heat preservation effect is poor, but the wash resistance of the heat preservation performance is good.

[0087] The temperature regulation conditions of the filled batting prepared in Example 1 and the ordinary temperature-regulating batting purchased on the market were respectively tested under temperature changes, and a curve graph was drawn. Among them, the filled batting prepared in Example 1 was the test sample, and the ordinary temperature-regulating batting purchased on the market was the control sample. See specifically Figure 1 and Figure 2 .

[0088] From Figure 1 and Figure 2 it can be seen that when the ambient temperature changes suddenly, the temperature regulation of the filled batting prepared in Example 1 is more gentle, indicating that its temperature regulation is more accurate.

[0089] The temperature-regulating and sweat-wicking materials prepared in Examples 1-3 and Comparative Example 1 were added to deionized water and stirred evenly to form a coating solution (solid content: 40%), which was sprayed on the fabric surface. The fabric composition was 85% nylon and 15% spandex, and the spraying amount was 50 g / m 2 , and then dried at 120-150 °C for 3-5 min to form a coating on the fabric surface. The enthalpy value and contact cool feeling of the coated fabric were tested. See Table 4 specifically.

[0090] Table 4 As can be seen from Table 4, the coating solution prepared from the temperature-regulating and sweat-wicking materials prepared in Examples 1-3 has a good binding effect with the fabric, and the washing resistance effect is also better. The enthalpy value decreases less after 20 washes. However, for the coated fabrics prepared from the temperature-regulating and sweat-wicking materials prepared in Comparative Example 1 and Comparative Example 2, the enthalpy value decreases significantly after 20 washes, which also shows that the temperature-regulating and sweat-wicking material prepared in Comparative Example 1 is easy to break, and the inorganic nanoparticles of the temperature-regulating and sweat-wicking material prepared in Comparative Example 2 are easy to fall off. Therefore, the washing resistance effect is poor.

[0091] Unless otherwise specified, the ratios described in the present invention are all mass ratios, and the percentages are all mass percentages; the raw materials are all commercially available.

[0092] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A temperature regulating and perspiration wicking material, characterized in that: The preparation method of the temperature regulating and perspiration wicking material comprises the following steps: S1. Surface modification of inorganic nanoparticles: adding inorganic nanoparticles to anhydrous ethanol and ultrasonically dispersing for 5 to 10 minutes, adding a silane coupling agent and mixing evenly, reacting for 6 to 8 hours, centrifuging, washing, and drying to obtain modified inorganic nanoparticles; S2. Preparation of shell material solution: Add N-vinylpyrrolidone, 2-acrylic acid-2-[[(butylamino)-carbonyl]oxy]ethyl ester and modified inorganic nanoparticles into anhydrous ethanol and stir for 20 to 30 minutes, then add initiator and cross-linking agent and continue stirring for 5 to 10 minutes at a stirring rate of 200 to 300 r / min to obtain a shell material solution; S3. Preparation of core material solution Adding phase change material and emulsifier into deionized water, stirring at a stirring rate of 800-1000 r / min for 20-30 min at 40-50° C. using a constant temperature magnetic stirrer to obtain a core material solution; S4. Preparation of temperature regulating and perspiration wicking materials The core material solution is stirred at a stirring rate of 600-700 r / min, and the shell material solution is added to the core material solution. The temperature is then raised to 65-75°C, and the reaction is carried out under nitrogen protection for 6-7 hours to obtain a phase change microcapsule suspension. The temperature regulating and sweat-releasing material is obtained by filtration, washing with ethanol solution, drying and grinding.

2. A temperature regulating and perspiration wicking material according to claim 1, characterized in that: The inorganic nanoparticles in S1 are one or more of graphene, titanium dioxide, boron nitride, and carbon nanotubes; The particle size of the inorganic nanoparticles is 4 to 10 nm.

3. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The silane coupling agent in S1 is KH570, and the added amount is 13-20% of the mass of the inorganic nanoparticles.

4. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The mass ratio of N-vinylpyrrolidone, 2-acrylic acid-2-[[(butylamino)-carbonyl]oxy]ethyl ester, modified inorganic nanoparticles and anhydrous ethanol in S2 is 10-14:4-6:1.2-1.6:70-80.

5. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The initiator in S2 is azobisisobutyronitrile, and the added amount is 1.3-1.8% of the mass of N-vinylpyrrolidone; The cross-linking agent is N,N ， -Methylenebisacrylamide, the added amount is 2-3% of the mass of N-vinylpyrrolidone.

6. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The phase change material in S3 is one or more of n-octadecane, paraffin, palmitic acid and its esters, fatty acids and their esters, pentaerythritol, and trimethylolethane.

7. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The emulsifier in S3 is one or more of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, Span 80, and Tween 80.

8. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The mass ratio of the phase change material, the emulsifier and the deionized water in S3 is 20-26:4-7:60-70.

9. The temperature regulating and perspiration wicking material according to claim 1, characterized in that: The volume ratio of the core material solution to the shell material solution in S4 is 1-1.1:1.3-1.7; The drying temperature is 60-80° C. and the drying time is 12-24 hours.

10. Application of a temperature regulating and perspiration wicking material in fibers and flakes, characterized in that: The application includes adding to the fiber matrix in the form of pre-spinning addition; being used for the preparation of filling flakes; being made into a coating liquid to form a coating on the surface of the fabric through hot rolling, spraying, etc.; The fiber matrix is ​​one of polyester, nylon, acrylic, polypropylene, spandex, lyocell and viscose; The fabric is a kind of non-woven fabric, nylon-spandex fabric, or polyester-spandex fabric.

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