Cool heat-conducting breathable hot air non-woven fabric and preparation method thereof
By constructing a multidimensional thermally conductive network of nano-silver and nano-boron nitride in nonwoven fabric and combining it with a cooling finishing liquid, the problem of poor heat dissipation of traditional hot air nonwoven fabric in high-temperature environments is solved, achieving efficient heat conduction and long-lasting cooling effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional hot-air nonwoven fabrics hinder the loss of sweat and heat in high-temperature environments or high-intensity activities, leading to skin discomfort and health risks, and lacking heat conduction, breathability and cooling functions.
By modifying the thermal conductivity of polyester fiber nonwoven fabric, a multidimensional thermally conductive network of nano-silver and nano-boron nitride is constructed. Combined with peppermint oil microcapsules and modified xylitol in the cooling finishing liquid, a synergistic effect of efficient thermal conductivity and cooling sensation is formed.
It achieves efficient heat conduction and long-lasting cooling sensation in non-woven fabrics, improves heat dissipation efficiency, and enhances wearing comfort and safety.
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Figure SMS_1
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of hot air non-woven fabric, in particular to a cool heat-conducting breathable hot air non-woven fabric and a preparation method thereof. BACKGROUND
[0002] Non-woven fabric, also known as non-woven cloth, is a kind of fabric formed without spinning and weaving, mainly formed by fixing fiber web through mechanical, thermal or chemical methods. Among them, hot air non-woven fabric, as a kind of thermal bonding non-woven fabric, its production process is to card the fiber into a web, and then use hot air to penetrate the fiber web to make the surface layer of the fiber melt and bond. This process gives the product the characteristics of loftiness, softness, good elasticity, strong warmth retention, etc., making it widely used in disposable hygiene products (such as diapers, sanitary napkin fabrics) and high-end warmth filling materials (such as bedding, cold-weather clothing) and other fields.
[0003] However, due to its excellent warmth retention characteristics, the application of traditional hot air non-woven fabric in high temperature environment or high intensity activities is significantly limited. When the wearer is in hot summer or after intense exercise, the inherent warmth retention of non-woven fabric will hinder the timely dissipation of sweat and heat generated by the human body. This accumulation of heat and humidity not only easily causes skin itching, allergies and other discomforts, but also increases the risk of heat stroke and heat exhaustion due to continuous increase in core body temperature. Dizziness, fatigue and muscle cramps caused by excessive dehydration also follow.
[0004] Therefore, the market urgently needs a material that can give non-woven fabric the functions of efficient heat conduction, breathability and persistent coolness while retaining its original softness, loftiness and other advantages. Therefore, the development of a cool heat-conducting breathable hot air non-woven fabric with active thermal management capability has important practical significance for improving the wear comfort and safety of summer clothing, protective products and sportswear. SUMMARY
[0005] The present application aims to provide a cool heat-conducting breathable hot air non-woven fabric and a preparation method thereof to solve the problems in the prior art.
[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: Step 1: ultrasonic cleaning of polyester fiber non-woven fabric with ethanol solution to obtain pretreated polyester fiber non-woven fabric; Step 2: heat-conducting modification treatment of the pretreated polyester fiber non-woven fabric to obtain heat-conducting polyester fiber non-woven fabric; Step 3: hot air bonding of the heat-conducting polyester fiber non-woven fabric, polyethylene non-woven fabric and cellulose-based non-woven fabric in turn to obtain heat-conducting breathable hot air non-woven fabric; Step 4: immersion treatment of the heat-conducting breathable non-woven fabric in a cool finishing liquid, and drying to obtain cool heat-conducting breathable hot air non-woven fabric.
[0007] Further, the number of ultrasonic cleaning in step 1 is 4-6 times; the process condition of hot air bonding in step 3 is 165-170℃; the condition of padding treatment in step 4 is 4-6h, and the drying temperature is 65-75℃.
[0008] Further, the heat conduction modification treatment in step 2 comprises the following steps: S1: take the nano boron nitride powder into a crucible, put the crucible into a muffle furnace, program the temperature to rise to 900-1000°C, keep constant temperature for 1-3h, then cool to 20-25℃, wash and filter for 3-5 times to purify, dry, and obtain hydroxylated nano boron nitride; mix the hydroxylated nano boron nitride and deionized water, ultrasonic treatment for 1-2h, add carboxylated cellulose nanofiber, and high-speed stirring at a speed of 1500-2500r / min for 10-20min to obtain a hydroxylated nano boron nitride dispersion; S2: dissolve dopamine hydrochloride in deionized water, adjust the pH to 8-8.5 with tris-hydroxymethyl aminomethane buffer solution to prepare a dopamine hydrochloride solution, immerse the pretreated polyester fiber non-woven fabric into the dopamine hydrochloride solution, and stir under the condition of water bath at 55-65℃ for 11-13h; after the reaction is completed, take out the non-woven fabric, rinse with deionized water, and dry to obtain a polydopamine surface modified polyester fiber non-woven fabric; S3: dissolve silver nitrate in deionized water to obtain a silver nitrate solution; immerse the polydopamine surface modified polyester fiber non-woven fabric into the silver nitrate solution, stir for 1-2h, add sodium borohydride solution at a rate of 5mL / min, continue to stir for 1-2h, rinse with deionized water, and dry to obtain a nano silver particle modified polyester fiber non-woven fabric; S4: immerse the nano silver particle modified polyester fiber non-woven fabric into the hydroxylated nano boron nitride dispersion, take it out after 8-12s, dry, repeat the immersion-drying operation for 3-5 times to obtain a heat-conductive polyester fiber non-woven fabric.
[0009] Further, the mass ratio of the hydroxylated nano boron nitride, deionized water and carboxylated cellulose nanofiber in S1 is 3:100:0.3; the mass ratio of dopamine hydrochloride and deionized water in S2 is 1:200; and the mass ratio of silver nitrate and deionized water in S3 is 1:200.
[0010] Further, the preparation steps of the cool finishing liquid in step 4 are as follows: (1): Take sodium alginate aqueous solution, add Span 80 and peppermint oil, and perform the first homogenization emulsification at a speed of 9000~10000 rpm to form a primary emulsion. Add gelatin aqueous solution to the primary emulsion and perform the second homogenization emulsification at the same speed to form an O / W type emulsion. Place the emulsion at 40~50℃ and 550~650 rpm, adjust the pH value to 4.0~4.3 to undergo a coagulation reaction to encapsulate the oil droplets, cool down to 0~10℃ and maintain for 25~35 min, adjust the pH value to 9~10 with sodium hydroxide solution, add glutaraldehyde aqueous solution, raise the temperature to 20~25℃, continue to solidify for 2~4 h, and obtain peppermint oil microcapsules after washing with anhydrous ethanol, low-speed centrifugation and low-temperature freeze drying. (2): Modified xylitol, cooling silicone oil, hydrophilic oil agent and peppermint oil microcapsules were mixed to prepare a cooling oil agent; (3): Mix the cooling oil and water to obtain the cooling finishing liquid.
[0011] Furthermore, the sodium alginate aqueous solution in (1) has a mass concentration of 0.3%, and the gelatin aqueous solution has a mass concentration of 1.2%; the cooling finishing liquid in (3) has a solid content of 35%.
[0012] Furthermore, in (1), the volume ratio of sodium alginate aqueous solution, gelatin aqueous solution, Span 80, peppermint oil and glutaraldehyde aqueous solution is 116.7:116.7:1.17:1.75:1.4; in (2), modified xylitol, ice-feeling silicone oil, hydrophilic oil agent and peppermint oil microcapsules are mixed in a mass ratio of 5:5:5:6.
[0013] Furthermore, the preparation steps of the modified xylitol are as follows: Xylitol and sodium hydroxide were dissolved in N,N-dimethylformamide and stirred in an ice-water bath at 0-5°C until dissolved to obtain a xylitol solution. Glutaryl chloride was diluted with N,N-dimethylformamide and added dropwise to the xylitol solution while cooling in an ice-water bath and stirring continuously. After the addition was complete, the ice-water bath was removed, the temperature was raised to 20-25°C, and the reaction was continued at 20-25°C with stirring for 1-3 hours. After the reaction was completed, the mixture was extracted with dichloromethane, washed first with dilute hydrochloric acid and then with brine, filtered, and then rotary evaporated to obtain modified xylitol.
[0014] Furthermore, the mass ratio of xylitol, sodium hydroxide, and N,N-dimethylformamide is 1.83:0.88:20; glutaryl chloride and N,N-dimethylformamide are mixed at a volume ratio of 1.1:10.
[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention describes a cooling, heat-conducting, breathable, and hot-air nonwoven fabric and its preparation method. Under weakly alkaline conditions, dopamine hydrochloride undergoes oxidative self-polymerization on the fiber surface to form a polydopamine coating. Polydopamine acts as a reducing agent, providing a robust surface modification platform that in-situ reduces silver ions to nano-silver and firmly anchors them, achieving stable and efficient loading of nano-silver and nano-boron nitride, thus constructing a multidimensional thermally conductive network. Hydroxylated boron nitride and carboxylated cellulose nanofibers form a stable dispersion through hydrogen bonding, thereby loading it onto the fibers. In the preparation of the cooling finishing liquid, gelatin and sodium alginate encapsulate peppermint oil through a complex coagulation reaction and are cross-linked and cured with glutaraldehyde to form microcapsules, achieving sustained release and durability of the cooling components. Xylitol and glutaryl chloride undergo an acyl chloride reaction to generate modified xylitol to reduce water solubility and ensure functional durability.
[0016] This invention describes a cooling, thermally conductive, breathable, and hot-air nonwoven fabric and its preparation method. Utilizing the reducing and adhesive properties of catechol groups in a polydopamine coating, it synergistically achieves in-situ deposition of nano-silver and a robust loading of hydroxylated nano-boron nitride dispersion, constructing a highly efficient thermally conductive network. This network, together with the subsequently applied cooling finishing liquid, forms a functional synergy based on the physical interface, creating a complete thermal cycle from heat conduction to efficient heat dissipation. Modified xylitol (dissolution endothermic) and ice-feeling silicone oil (rapid thermal conduction) in the cooling finishing liquid jointly enhance the heat dissipation efficiency transferred from the thermally conductive network, while peppermint oil microcapsules, prepared via a complex coagulation method, have slow-release properties that complement the physical cooling sensation. The thermally conductive layer is responsible for increasing the longitudinal heat transfer rate, while the cooling finishing liquid enhances surface heat dissipation through various physicochemical processes. This mechanism combines active thermal conduction with a passive cooling effect, significantly enhancing the overall cooling experience of the nonwoven fabric. Detailed Implementation
[0017] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] In the following specific implementation, Polyester fiber nonwoven fabric: 1m×100m, 0.1mm thickness, sourced from Shengjing Textile Co., Ltd., Hejian City; Polyethylene nonwoven fabric: 1.5m×200m, 0.17mm thick, sourced from Langfang Maxon Chemical Building Materials Co., Ltd. Cellulose-based nonwoven fabric: Item No. HC-25, sourced from Shenzhen Haicheng Environmental Protection Products Co., Ltd.; Nano boron nitride: Product number XH-BN-500, sourced from Shanghai Xiaohuang Nanotechnology Co., Ltd.; Carboxylated cellulose nanofibers: Product No. I0007-1, sourced from Nanjing Dulai Biotechnology Co., Ltd.; Dopamine hydrochloride: Product number S20376, sourced from Shanghai Yuanye Biotechnology Co., Ltd.; Tris(hydroxymethyl)aminomethane buffer: Product number PB93040, sourced from Guangdong Wengjiang Chemical Reagent Co., Ltd.; Gelatin: Product No. S30952, sourced from Shanghai Yuanye Biotechnology Co., Ltd.; Sodium alginate: Product number S11053, sourced from Shanghai Yuanye Biotechnology Co., Ltd.; Span 80: Product No. S15052, sourced from Shanghai Yuanye Biotechnology Co., Ltd.; Peppermint oil: Product number HC333339, sourced from Jiangxi Hengcheng Natural Fragrance Oil Co., Ltd. Glutaraldehyde: 25% aqueous solution, product number 30092436, sourced from Sinopharm Chemical Reagent Co., Ltd. Xylitol: Product No. S11039, sourced from Shanghai Yuanye Biotechnology Co., Ltd.; Ice-sensitive silicone oil: Model K-809, sourced from Dongguan Kefeng Textile Auxiliaries Industry Co., Ltd. Hydrophilic oil: Model Texnology® N09, sourced from Guangzhou Lianzhuang Technology Co., Ltd.; N,N-Dimethylformamide: Product No. DS1451, sourced from Shanghai Yaokan Chemical Co., Ltd.; Glutaryl chloride: Product number PB50251, sourced from Guangdong Wengjiang Chemical Reagent Co., Ltd.; Anhydrous ethanol, silver nitrate, sodium borohydride, sodium hydroxide, dichloromethane, hydrochloric acid, and sodium chloride were all of analytical grade.
[0019] Example 1: A cooling, heat-conducting, breathable, and hot-air nonwoven fabric and its preparation method, comprising the following steps: Step 1: Ultrasonically clean the polyester fiber nonwoven fabric four times with an ethanol solution to obtain a pretreated polyester fiber nonwoven fabric. Step 2: Perform thermal conductivity modification treatment on the pretreated polyester fiber nonwoven fabric to obtain thermally conductive polyester fiber nonwoven fabric. Step 3: Stack the thermally conductive polyester fiber nonwoven fabric, polyethylene nonwoven fabric and cellulose-based nonwoven fabric in sequence and place them in a hot air oven. Hot air bonding is performed at 165℃ to obtain thermally conductive and breathable hot air nonwoven fabric. Step 4: Immerse the thermally conductive and breathable nonwoven fabric in the cooling finishing solution for 4 hours, and dry it at 65℃ to obtain the cooling, thermally conductive and breathable hot air nonwoven fabric. The thermal conductivity modification treatment includes the following steps: S1: Place 10g of nano boron nitride powder into a crucible, place the crucible in a muffle furnace, set the muffle furnace program to heat to 900°C, maintain the temperature for 1 hour, then cool to 20°C, purify by washing with distilled water and filtering three times, and dry in a vacuum drying oven to obtain hydroxylated nano boron nitride; mix 6g of hydroxylated nano boron nitride with 200mL of deionized water and sonicate for 1 hour to fully disperse it, add 0.6g of carboxylated cellulose nanofibers, and stir at high speed of 1500r / min for 10min to obtain a hydroxylated nano boron nitride dispersion with a concentration of 30mg / mL; S2: Dissolve 1g of dopamine hydrochloride in 200mL of deionized water and adjust the pH to 8 with 1.2mol / L tris(hydroxymethyl)aminomethane buffer to prepare a dopamine hydrochloride solution. Immerse the pretreated polyester fiber nonwoven fabric in the dopamine hydrochloride solution and stir slowly for 11h in a 55℃ water bath. After the reaction is completed, take out the nonwoven fabric, rinse it repeatedly with deionized water to remove physically adsorbed impurities, and dry it to obtain polydopamine-modified polyester fiber nonwoven fabric. S3: Dissolve 1g of silver nitrate in 200mL of deionized water to prepare a silver nitrate solution with a concentration of 5mg / mL; immerse the polydopamine-modified polyester fiber nonwoven fabric in the silver nitrate solution, stir slowly for 1h, add 40mL of sodium borohydride solution with a concentration of 6.0mg / mL at a rate of 5mL / min, and continue stirring for 1h. Rinse repeatedly with deionized water to remove impurities, and dry to obtain polyester fiber nonwoven fabric modified with nano-silver particles; S4: The polyester fiber nonwoven fabric modified with nano-silver particles was immersed in a hydroxylated nano-boron nitride dispersion with a concentration of 30 mg / mL. After immersion for 8 seconds, it was taken out and dried using an infrared heating lamp. The immersion-drying operation was repeated 3 times to obtain the thermally conductive polyester fiber nonwoven fabric. The preparation steps of the cooling finishing liquid are as follows: (1): Prepare a 1.2% gelatin aqueous solution and a 0.3% sodium alginate aqueous solution respectively; take 116.7 mL of sodium alginate aqueous solution, add 1.17 mL of Span 80 and 1.75 mL of peppermint oil, and perform the first homogenization emulsification at 9000 rpm to form a primary emulsion with good oil phase dispersion. Add 116.7 mL of gelatin aqueous solution to the primary emulsion and perform the second homogenization emulsification at the same speed to form a stable O / W type emulsion. Place the emulsion at 40℃ and 550 rpm, adjust the pH value to 4.0 to induce the gelatin and sodium alginate to undergo a coagulation reaction to encapsulate the oil droplets, cool down to 0℃ and maintain for 25 min to gel the wall material, adjust the pH value to 9 with sodium hydroxide solution, add 1.4 mL of glutaraldehyde aqueous solution for cross-linking and curing, heat up to 20℃ and continue curing for 2 h, and after washing with anhydrous ethanol, low-speed centrifugation and low-temperature freeze drying, peppermint oil microcapsules are obtained. (2): Mix 5g of modified xylitol, 5g of cooling silicone oil, 5g of hydrophilic oil agent and 6g of peppermint oil microcapsules to prepare a cooling oil agent; (3): Mix 21g of cooling oil and 39g of water to obtain a cooling finishing liquid with a solid content of 35%; The preparation steps of the modified xylitol are as follows: 1.83 g xylitol and 0.88 g sodium hydroxide were dissolved in 20 mL of N,N-dimethylformamide. A magnetic stir bar was installed, and the mixture was stirred in an ice-water bath at 0°C until completely dissolved to obtain a xylitol solution. In a dry dropping funnel, 1.1 mL of glutaryl chloride was diluted with 10 mL of N,N-dimethylformamide and slowly added dropwise to the xylitol solution while cooling in an ice-water bath and stirring continuously. After the addition was complete, the ice-water bath was removed, and the temperature was slowly raised to 20°C. The reaction was then continued to be stirred at 20°C for 1 h. After the reaction was completed, the mixture was extracted with dichloromethane, washed with dilute hydrochloric acid to remove residual alkali, washed with brine, filtered, and the solvent was removed by rotary evaporation to obtain modified xylitol.
[0020] Example 2: A cooling, heat-conducting, breathable, and hot-air nonwoven fabric and its preparation method, comprising the following steps: Step 1: Ultrasonically clean the polyester fiber nonwoven fabric 5 times with ethanol solution to obtain pretreated polyester fiber nonwoven fabric. Step 2: Perform thermal conductivity modification treatment on the pretreated polyester fiber nonwoven fabric to obtain thermally conductive polyester fiber nonwoven fabric. Step 3: Stack the thermally conductive polyester fiber nonwoven fabric, polyethylene nonwoven fabric and cellulose-based nonwoven fabric in sequence and place them in a hot air oven. Hot air bonding is performed at 167°C to obtain thermally conductive and breathable hot air nonwoven fabric. Step 4: Immerse the thermally conductive and breathable nonwoven fabric in the cooling finishing solution for 5 hours, and dry it at 70°C to obtain the cooling, thermally conductive and breathable hot air nonwoven fabric. The thermal conductivity modification treatment includes the following steps: S1: Place 15g of nano boron nitride powder into a crucible, place the crucible in a muffle furnace, set the muffle furnace program to heat to 950°C, maintain the temperature for 2 hours, then cool to 23°C, purify by washing with distilled water and filtering four times, and dry in a vacuum drying oven to obtain hydroxylated nano boron nitride; mix 9g of hydroxylated nano boron nitride with 300mL of deionized water and sonicate for 1.5 hours to fully disperse it, add 0.9g of carboxylated cellulose nanofibers, and stir at high speed of 2000r / min for 150min to obtain a hydroxylated nano boron nitride dispersion with a concentration of 30mg / mL; S2: Dissolve 1.5g of dopamine hydrochloride in 300mL of deionized water and adjust the pH to 8.3 with 1.2mol / L tris(hydroxymethyl)aminomethane buffer to prepare a dopamine hydrochloride solution. Immerse the pretreated polyester fiber nonwoven fabric in the dopamine hydrochloride solution and stir slowly for 12h in a 60℃ water bath. After the reaction is completed, take out the nonwoven fabric, rinse it repeatedly with deionized water to remove physically adsorbed impurities, and dry it to obtain polydopamine-modified polyester fiber nonwoven fabric. S3: Dissolve 1.5g of silver nitrate in 300mL of deionized water to prepare a silver nitrate solution with a concentration of 5mg / mL; immerse the polydopamine-modified polyester fiber nonwoven fabric in the silver nitrate solution and stir slowly for 1.5h; add 60mL of sodium borohydride solution with a concentration of 6.0mg / mL at a rate of 5mL / min and continue stirring for 1.5h; rinse repeatedly with deionized water to remove impurities; dry to obtain polyester fiber nonwoven fabric modified with nano-silver particles; S4: The polyester fiber nonwoven fabric modified with nano-silver particles was immersed in a hydroxylated nano-boron nitride dispersion with a concentration of 30 mg / mL. After soaking for 10 seconds, it was taken out and dried using an infrared heating lamp. The immersion-drying operation was repeated 4 times to obtain the thermally conductive polyester fiber nonwoven fabric. The preparation steps of the cooling finishing liquid are as follows: (1): Prepare a 1.2% gelatin aqueous solution and a 0.3% sodium alginate aqueous solution respectively; take 116.7 mL of sodium alginate aqueous solution, add 1.17 mL of Span 80 and 1.75 mL of peppermint oil, and perform the first homogenization emulsification at 9500 rpm to form a primary emulsion with good oil phase dispersion. Add 116.7 mL of gelatin aqueous solution to the primary emulsion and perform the second homogenization emulsification at the same speed to form a stable O / W type emulsion. Place the emulsion at 45℃ and 600 rpm, adjust the pH value to 4.2 to induce the gelatin and sodium alginate to undergo a coagulation reaction to encapsulate the oil droplets, cool down to 5℃ and maintain for 30 min to gel the wall material, adjust the pH value to 9.5 with sodium hydroxide solution, add 1.4 mL of glutaraldehyde aqueous solution for cross-linking and curing, heat up to 23℃ and continue curing for 3 h, and after washing with anhydrous ethanol, low-speed centrifugation and low-temperature freeze drying, peppermint oil microcapsules are obtained. (2): Mix 10g of modified xylitol, 10g of cooling silicone oil, 10g of hydrophilic oil agent and 12g of peppermint oil microcapsules to prepare a cooling oil agent; (3): Mix 42g of cooling oil and 78g of water to obtain a cooling finishing liquid with a solid content of 35%; The preparation steps of the modified xylitol are as follows: 3.66 g xylitol and 1.76 g sodium hydroxide were dissolved in 40 mL of N,N-dimethylformamide. A magnetic stir bar was installed, and the mixture was stirred in an ice-water bath at 3°C until completely dissolved to obtain a xylitol solution. In a dry dropping funnel, 2.2 mL of glutaryl chloride was diluted with 20 mL of N,N-dimethylformamide and slowly added dropwise to the xylitol solution while cooling in an ice-water bath and stirring continuously. After the addition was complete, the ice-water bath was removed, and the temperature was slowly raised to 23°C. The reaction was then continued at 23°C with stirring for 2 hours. After the reaction was completed, the mixture was extracted with dichloromethane, washed with dilute hydrochloric acid to remove residual alkali, washed with brine, filtered, and the solvent was removed by rotary evaporation to obtain modified xylitol.
[0021] Example 3: A cooling, heat-conducting, breathable, and hot-air nonwoven fabric and its preparation method, comprising the following steps: Step 1: Ultrasonically clean the polyester fiber nonwoven fabric 6 times with ethanol solution to obtain pretreated polyester fiber nonwoven fabric; Step 2: Perform thermal conductivity modification treatment on the pretreated polyester fiber nonwoven fabric to obtain thermally conductive polyester fiber nonwoven fabric. Step 3: Stack the thermally conductive polyester fiber nonwoven fabric, polyethylene nonwoven fabric and cellulose-based nonwoven fabric in sequence and place them in a hot air oven. Hot air bonding is performed at 170°C to obtain thermally conductive and breathable hot air nonwoven fabric. Step 4: Immerse the thermally conductive and breathable nonwoven fabric in the cooling finishing solution for 6 hours, and dry it at 75°C to obtain the cooling, thermally conductive and breathable hot air nonwoven fabric. The thermal conductivity modification treatment includes the following steps: S1: Take 20g of nano boron nitride powder and put it into a crucible. Place the crucible into a muffle furnace and set the muffle furnace program to heat up to 1000°C and keep it at a constant temperature for 3 hours. Then cool it to 25°C and purify it 5 times by washing with distilled water and filtering. Dry it in a vacuum drying oven to obtain hydroxylated nano boron nitride. 12g of hydroxylated boron nitride nanoparticles and 400mL of deionized water were mixed and ultrasonically treated for 2h to ensure full dispersion. Then, 1.2g of carboxylated cellulose nanofibers were added and stirred at high speed of 2500r / min for 20min to obtain a hydroxylated boron nitride nanoparticle dispersion with a concentration of 30mg / mL. S2: Dissolve 2g of dopamine hydrochloride in 400mL of deionized water and adjust the pH to 8.5 with 1.2mol / L tris(hydroxymethyl)aminomethane buffer to prepare a dopamine hydrochloride solution. Immerse the pretreated polyester fiber nonwoven fabric in the dopamine hydrochloride solution and stir slowly for 13h in a 65℃ water bath. After the reaction is completed, take out the nonwoven fabric, rinse it repeatedly with deionized water to remove physically adsorbed impurities, and dry it to obtain polydopamine-modified polyester fiber nonwoven fabric. S3: Dissolve 2g of silver nitrate in 400mL of deionized water to prepare a silver nitrate solution with a concentration of 5mg / mL; immerse the polydopamine-modified polyester fiber nonwoven fabric in the silver nitrate solution, stir slowly for 2h, add 80mL of sodium borohydride solution with a concentration of 6.0mg / mL at a rate of 5mL / min, and continue stirring for 2h. Rinse repeatedly with deionized water to remove impurities, and dry to obtain polyester fiber nonwoven fabric modified with nano-silver particles; S4: The polyester fiber nonwoven fabric modified with nano-silver particles was immersed in a hydroxylated nano-boron nitride dispersion with a concentration of 30 mg / mL. After soaking for 12 seconds, it was taken out and dried using an infrared heating lamp. The immersion-drying operation was repeated 5 times to obtain the thermally conductive polyester fiber nonwoven fabric. The preparation steps of the cooling finishing liquid are as follows: (1): Prepare a 1.2% gelatin aqueous solution and a 0.3% sodium alginate aqueous solution respectively; take 116.7 mL of sodium alginate aqueous solution, add 1.17 mL of Span 80 and 1.75 mL of peppermint oil, and perform the first homogenization emulsification at 10000 rpm to form a primary emulsion with good oil phase dispersion. Add 116.7 mL of gelatin aqueous solution to the primary emulsion and perform the second homogenization emulsification at the same speed to form a stable O / W type emulsion. Place the emulsion at 50℃ and 650 rpm, adjust the pH value to 4.3 to induce the gelatin and sodium alginate to undergo a coagulation reaction to encapsulate the oil droplets, cool down to 10℃ and maintain for 35 min to gel the wall material, adjust the pH value to 10 with sodium hydroxide solution, add 1.4 mL of glutaraldehyde aqueous solution for cross-linking and curing, heat up to 25℃ and continue curing for 4 h, and obtain peppermint oil microcapsules after washing with anhydrous ethanol, low-speed centrifugation and low-temperature freeze drying. (2): Mix 15g of modified xylitol, 15g of cooling silicone oil, 15g of hydrophilic oil agent and 18g of peppermint oil microcapsules to prepare a cooling oil agent; (3): Mix 63g of cooling oil and 117g of water to obtain a cooling finishing liquid with a solid content of 35%; The preparation steps of the modified xylitol are as follows: 5.49 g xylitol and 2.64 g sodium hydroxide were dissolved in 60 mL of N,N-dimethylformamide. A magnetic stir bar was installed, and the mixture was stirred in an ice-water bath at 5°C until completely dissolved to obtain a xylitol solution. In a dry dropping funnel, 3.3 mL of glutaryl chloride was diluted with 30 mL of N,N-dimethylformamide and slowly added dropwise to the xylitol solution while cooling in an ice-water bath and stirring continuously. After the addition was complete, the ice-water bath was removed, and the temperature was slowly raised to 25°C. The reaction was then continued at 25°C with stirring for 3 h. After the reaction was completed, the mixture was extracted with dichloromethane, washed with dilute hydrochloric acid to remove residual alkali, washed with brine, filtered, and the solvent was removed by rotary evaporation to obtain modified xylitol.
[0022] Comparative Example 1: Compared with Example 3, step 2 was removed, and the remaining steps were the same as in Example 3.
[0023] Comparative Example 2: Compared with Example 3, no peppermint oil microcapsules were added to the cooling finishing liquid, and the remaining steps were the same as in Example 3.
[0024] Comparative Example 3: Compared with Example 3, the xylitol added to the cooling finishing liquid was unmodified xylitol, and the remaining steps were the same as in Example 3.
[0025] Experiment: Samples were prepared from the cool-feeling, heat-conducting, breathable hot air nonwoven fabrics obtained in Examples 1-3 and Comparative Examples 1-3, and their performance was tested. Thermal conductivity testing: In accordance with ISO 22007-2:2022 standard, a circular sample with a diameter of 20 mm and a thickness of 400 μm was used, and the sample was tested at 25 °C using a thermal constant analyzer. Cooling coefficient test: According to GB / T 35263-2017 standard, a square sample with a side length of 200mm was used, and the test conditions were set as follows: the temperature of the thermal detection plate was 35℃ and the temperature of the sample stage was 20℃. Air permeability test: According to GB / T 24218.15-2018 standard, a square sample with a side length of 100mm was used, and the test pressure difference was 200Pa; All test results are shown in Table 1.
[0026] Table 1
[0027] Examples 1-3 demonstrate that by constructing a polydopamine-mediated multidimensional thermally conductive network (nano-silver and hydroxylated boron nitride) and achieving a synergistic effect at the functional level with a cooling finishing liquid composed of peppermint oil microcapsules and modified xylitol, the finished nonwoven fabric exhibits significantly better thermal conductivity, instantaneous cooling value, and air permeability than the comparative examples lacking key components or processes. This proves that the preparation method can synergistically improve the thermal conductivity, cooling sensation, and air permeability of the material, demonstrating the comprehensive advantages of strong and lasting cooling sensation and comfortable breathability.
[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric, characterized in that: Step 1: Ultrasonically clean the polyester fiber nonwoven fabric with an ethanol solution to obtain a pretreated polyester fiber nonwoven fabric; Step 2: Perform thermal conductivity modification treatment on the pretreated polyester fiber nonwoven fabric to obtain thermally conductive polyester fiber nonwoven fabric. Step 3: After stacking the thermally conductive polyester fiber nonwoven fabric, polyethylene nonwoven fabric and cellulose-based nonwoven fabric in sequence, hot air bonding is performed to obtain thermally conductive and breathable hot air nonwoven fabric. Step 4: Immerse the thermally conductive and breathable nonwoven fabric in the cooling finishing solution, then dry it to obtain the cooling, thermally conductive, breathable hot air nonwoven fabric.
2. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 1, characterized in that: The ultrasonic cleaning in step 1 is performed 4 to 6 times; the hot air bonding process in step 3 is performed at a temperature of 165 to 170°C; and the padding process in step 4 is performed at a time of 4 to 6 hours and a drying temperature of 65 to 75°C.
3. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 1, characterized in that: The thermal conductivity modification treatment in step 2 includes the following steps: S1: Place nano-boron nitride powder into a crucible, place the crucible in a muffle furnace, set the program to heat to 900~1000°C, maintain the temperature for 1~3 hours, then cool to 20~25°C, wash and filter with distilled water for 3~5 purifications, dry to obtain hydroxylated nano-boron nitride; mix hydroxylated nano-boron nitride with deionized water and sonicate for 1~2 hours, add carboxylated cellulose nanofibers, and stir at high speed of 1500~2500 r / min for 10~20 min to obtain hydroxylated nano-boron nitride dispersion; S2: Dissolve dopamine hydrochloride in deionized water and adjust the pH to 8-8.5 with tris(hydroxymethyl)aminomethane buffer to prepare a dopamine hydrochloride solution. Immerse the pretreated polyester fiber nonwoven fabric in the dopamine hydrochloride solution and stir the reaction in a water bath at 55-65℃ for 11-13 hours. After the reaction is completed, take out the nonwoven fabric, rinse it with deionized water, and dry it to obtain a polyester fiber nonwoven fabric with polydopamine surface modification. S3: Dissolve silver nitrate in deionized water to prepare silver nitrate solution; immerse polydopamine-modified polyester fiber nonwoven fabric in silver nitrate solution, stir for 1-2 h, add sodium borohydride solution dropwise at a rate of 5 mL / min, and continue stirring for 1-2 h, rinse with deionized water, and dry to obtain polyester fiber nonwoven fabric modified with nano-silver particles. S4: Immerse the polyester fiber nonwoven fabric modified with nano-silver particles in a hydroxylated nano-boron nitride dispersion for 8-12 seconds, then remove and dry. Repeat the immersion-drying operation 3-5 times to obtain a thermally conductive polyester fiber nonwoven fabric.
4. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 3, characterized in that: The mass ratio of hydroxylated boron nitride nanoparticles, deionized water, and carboxylated cellulose nanofibers in S1 is 3:100:0.3; the mass ratio of dopamine hydrochloride and deionized water in S2 is 1:200; and the mass ratio of silver nitrate and deionized water in S3 is 1:
200.
5. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 1, characterized in that: The preparation steps of the cooling finishing liquid in step 4 are as follows: (1): Take sodium alginate aqueous solution, add Span 80 and peppermint oil, and perform the first homogenization emulsification at a speed of 9000~10000 rpm to form a primary emulsion. Add gelatin aqueous solution to the primary emulsion and perform the second homogenization emulsification at the same speed to form an O / W type emulsion. Place the emulsion at 40~50℃ and 550~650 rpm, adjust the pH value to 4.0~4.3 to undergo a coagulation reaction to encapsulate the oil droplets, cool down to 0~10℃ and maintain for 25~35 min, adjust the pH value to 9~10 with sodium hydroxide solution, add glutaraldehyde aqueous solution, raise the temperature to 20~25℃, continue to solidify for 2~4 h, and obtain peppermint oil microcapsules after washing with anhydrous ethanol, low-speed centrifugation and low-temperature freeze drying. (2): Modified xylitol, cooling silicone oil, hydrophilic oil agent and peppermint oil microcapsules were mixed to prepare a cooling oil agent; (3): Mix the cooling oil and water to obtain the cooling finishing liquid.
6. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 5, characterized in that: (1) The mass concentration of sodium alginate aqueous solution is 0.3%, and the mass concentration of gelatin aqueous solution is 1.2%; (3) The solid content of cooling finishing liquid is 35%.
7. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 5, characterized in that: (1) The volume ratio of sodium alginate aqueous solution, gelatin aqueous solution, Span 80, peppermint oil and glutaraldehyde aqueous solution is 116.7:116.7:1.17:1.75:1.4; (2) Modified xylitol, ice-feeling silicone oil, hydrophilic oil agent and peppermint oil microcapsules are mixed in a mass ratio of 5:5:5:
6.
8. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 5, characterized in that: The preparation steps of the modified xylitol are as follows: Xylitol and sodium hydroxide were dissolved in N,N-dimethylformamide and stirred in an ice-water bath at 0-5°C until dissolved to obtain a xylitol solution. Glutaryl chloride was diluted with N,N-dimethylformamide and added dropwise to the xylitol solution while cooling in an ice-water bath and stirring continuously. After the addition was complete, the ice-water bath was removed, the temperature was raised to 20-25°C, and the reaction was continued at 20-25°C with stirring for 1-3 hours. After the reaction was completed, the mixture was extracted with dichloromethane, washed first with dilute hydrochloric acid and then with brine, filtered, and then rotary evaporated to obtain modified xylitol.
9. The method for preparing a cool-feeling, heat-conducting, breathable, hot-air nonwoven fabric according to claim 8, characterized in that: The mass ratio of xylitol, sodium hydroxide, and N,N-dimethylformamide is 1.83:0.88:20; glutaryl chloride and N,N-dimethylformamide are mixed at a volume ratio of 1.1:
10.
10. A cool-feeling, heat-conducting, breathable, and hot-air nonwoven fabric is prepared by the preparation method according to any one of claims 1-9.