Preparation method of medical protective nonwoven fabric with temperature regulation and nonwoven fabric

Abstract

A method for preparing a temperature-regulating medical protective nonwoven fabric and the resulting nonwoven fabric enhance the hydrophilicity of the fabric surface through the reaction of dopamine and polyethyleneimine, thereby evenly distributing silicon particles on the flash-steamed nonwoven fabric. This optimizes its infrared emission performance within a specific wavelength range, improves the thermal radiation penetration of the coating, and reduces the accumulation of infrared radiation from the human body inside the protective clothing, thereby achieving radiative cooling and lowering the body temperature. Furthermore, due to the excellent antiviral and biochemical barrier properties of the flash-steamed nonwoven fabric, it is suitable for use as a medical material. Therefore, the present invention not only has excellent thermal radiation penetration but is also suitable for use in medical environments.

Description

Technical Field

[0001] The invention relates to a preparation process of a medical protective nonwoven fabric, belongs to the field of medical devices, and in particular to a preparation method of a medical protective nonwoven fabric with temperature regulation and the nonwoven fabric. Background Art

[0002] Medical protective clothing is a key piece of equipment for medical staff to protect themselves from pathogenic microorganisms, chemicals and other harmful substances while performing their tasks. Existing medical protective clothing generally has poor breathability. Wearing it for a long time can easily cause the wearer's body temperature to rise, leading to stuffiness, sweating and even heatstroke, and lacks an effective temperature regulation mechanism. At the same time, when doctors perform surgery on patients in the operating room, they need to consider the patient's physical condition. The air conditioning temperature should not be set too low, and the doctor's attention needs to be kept highly concentrated at all times. At this time, the doctor's body temperature is more likely to rise and he is more likely to feel hot.

[0003] Patent document No. 202010452580.3, filed on May 6, 2020, discloses a radiative cooling coating and its application, as well as a radiative cooling coating and textile. The coating comprises two functional layers that primarily reflect visible and infrared light and optimize ultraviolet light in sunlight, reducing heat absorption. While this solution can reduce light absorption and achieve a cooling effect, it does so because the heat absorbed by exogenous light sources is relatively small indoors, and the body dissipates heat primarily through radiation, evaporation, convection, and conduction. Therefore, improving the material's emissivity, transmittance, and reflectivity from the inside out to manage human thermal radiation is the only technical approach. This solution is not suitable for indoor use, and due to the sterility requirements of operating rooms, protective clothing materials have high requirements for antiviral properties and biochemical barrier properties, which are difficult for ordinary materials to achieve. Therefore, there is an urgent need for a method that can not only effectively improve the thermal radiation penetration of materials while also meeting medical requirements to address the aforementioned shortcomings of the prior art. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects and problems of the prior art, such as poor thermal radiation penetrability and inability to meet the medical environment, and to provide a method for preparing a medical protective non-woven fabric with good thermal radiation penetrability and temperature regulation suitable for medical environments and a non-woven fabric.

[0005] To achieve the above objectives, the technical solution of the present invention is: a method for preparing a medical protective nonwoven fabric with temperature regulation, the preparation method comprising the following steps:

[0006] Step 1: ultrasonically cleaning and drying the flash-steamed nonwoven fabric to obtain a dry flash-steamed nonwoven fabric;

[0007] Step 2: dissolving tris(hydroxymethyl)aminomethane in deionized water and adjusting the pH value with dilute hydrochloric acid to obtain a buffer solution;

[0008] Step 3: adding dopamine and polyethyleneimine to a buffer solution and mixing them evenly, immersing the dry flash-steamed nonwoven fabric therein and stirring at room temperature to obtain a hydrophilic flash-steamed nonwoven fabric;

[0009] Step 4: placing nano zinc oxide into deionized water and stirring to disperse it to obtain a zinc oxide dispersion;

[0010] Step 5: Dissolve 2-methylimidazole in N,N-dimethylformamide to obtain solution A; then add the zinc oxide dispersion dropwise to solution A and stir at room temperature, then centrifuge and wash with ethanol and vacuum dry to obtain ZnO@ZIF-8 particles;

[0011] Step 6: Disperse the ZnO@ZIF-8 particles in ethanol, then add water and mix to obtain solution B; then add tetraethyl orthosilicate to solution B for reaction, followed by centrifugation, washing with ethanol, and vacuum drying to obtain ZnO@ZIF-8@SiO2 particles;

[0012] Step 7: After uniformly mixing the ZnO@ZIF-8@SiO2 particles, the adhesive, and the deionized water, the mixture is coated on the hydrophilic flash-steamed nonwoven fabric and dried to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiative cooling flash-steamed nonwoven fabric.

[0013] After step seven, the method further includes:

[0014] Step 8: Evenly spray the temperature-sensitive color-changing material onto the radiation cooling flash steamed nonwoven fabric and dry it to obtain the radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0015] The ratio of tris(hydroxymethyl)aminomethane to deionized water in step 2 is: 0.6 g: 100 mL;

[0016] The adjustment range of the pH value in step 2 is: 8-9.

[0017] The mass ratio of dopamine to polyethyleneimine in step 3 is 1:2;

[0018] The room temperature in step 3 is 24°C-25°C;

[0019] The stirring time in step 3 is 11-12 hours.

[0020] The mass fraction of nano zinc oxide in the zinc oxide dispersion in step 4 is 0.5%-2%.

[0021] The mass ratio of 2-methylimidazole to N,N-dimethylformamide in step 5 is 1:50-1:70;

[0022] The mass ratio of the zinc oxide dispersion in step 5 to solution A is 1:4-1:2;

[0023] The room temperature in step 5 is 25°C-26°C;

[0024] The stirring time in step 5 is 23-24 hours.

[0025] The ratio of ZnO@ZIF-8 particles to ethanol in step 6 is: 0.4 g: 110 ml - 0.4 g: 90 ml;

[0026] The mass ratio of water to solution B in step 6 is 1:4;

[0027] The mass ratio of tetraethyl orthosilicate to solution B in step 6 is 1:70-1:50;

[0028] The reaction time in step six is ​​11-12 hours.

[0029] The mass ratio of ZnO@ZIF-8@SiO2 particles, binder and deionized water in step 7 is 1:1:1 or 1:1:1.1-1.5;

[0030] The drying in step seven refers to: drying in an oven at 60°C-65°C for 30-35 minutes;

[0031] The adhesive in step seven includes any one or any combination of polyvinyl alcohol or acrylic composite emulsion.

[0032] A medical protective nonwoven fabric with temperature regulation function, wherein the nonwoven fabric is a flash-steamed nonwoven fabric that is transparent to thermal radiation in the mid-infrared band of 7-14 μm emitted by the human body under indoor conditions and has a radiative cooling effect; the nonwoven fabric comprises a flash-steamed nonwoven fabric substrate and a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash-steamed nonwoven fabric substrate.

[0033] The nonwoven fabric comprises a flash-steamed nonwoven fabric substrate, a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash-steamed nonwoven fabric substrate, and a temperature-sensitive color-changing coating attached to the surface of the ZnO@ZIF-8@SiO2 coating;

[0034] The preparation materials of the temperature-sensitive color-changing coating include a leucochrome agent, a developer, and a low-polarity organic solvent;

[0035] The mass ratio of the leuco agent, the developer and the low-polarity organic solvent is 1:2-4:70;

[0036] The leucochrome agent includes crystal violet lactone;

[0037] The developer includes any one of bisphenol A, 1-naphthol, bisphenol S, and bisphenol AF;

[0038] The low-polarity organic solvent includes any one of octadecyl acrylate, 4-benzyloxyphenylethyl caproate, 1-octadecanoic acid, and phenyl benzoate.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. In the preparation method of a temperature-regulating medical protective nonwoven fabric of the present invention, the hydrophilicity of the fabric surface is enhanced through the reaction of dopamine and polyethyleneimine, thereby enabling the uniform distribution of silicon particles on the flash-steamed nonwoven fabric, thereby optimizing its infrared emission performance within a specific wavelength range, improving the thermal radiation penetration of the coating, and reducing the accumulation of human infrared radiation inside the protective clothing, thereby achieving radiative cooling and lowering the body temperature. Furthermore, due to the excellent antiviral properties and biochemical barrier effects of the flash-steamed nonwoven fabric, it is suitable for use as a medical material. Therefore, the present invention not only has excellent thermal radiation penetration but is also suitable for medical environments.

[0041] 2. The present invention provides a medical protective nonwoven fabric with temperature regulation, comprising a flash-steamed nonwoven fabric substrate and a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash-steamed nonwoven fabric substrate. In the application of the present invention, the flash-steamed nonwoven fabric has the characteristics of light weight, high strength, tear resistance and high barrier, and is suitable for use as medical protective clothing. The ZnO@ZIF-8@SiO2 coating exhibits high emissivity in the infrared range, which mainly comes from Si-O-Si stretching vibration, Si-CH3 bending vibration and phonon polarization resonance of silicon dioxide in the atmospheric transparent window. The polarization resonance enhances the coating's The infrared radiation emission ability is used to improve its infrared emissivity. When infrared radiation is radiated onto the coating, the phonon vibration mode in the coating resonates with the infrared radiation, so that the coating can more effectively convert the absorbed infrared radiation energy into its own vibration energy, and then re-emit it in the form of infrared radiation. As the emitted infrared radiation energy increases, the temperature of the coating surface will decrease accordingly, thereby achieving a cooling effect on the human body. The present invention solves the defect of poor thermal radiation penetration of traditional protective clothing by combining the structural advantages of flash-steamed non-woven fabrics with the functions of radiation refrigeration materials, and can also be applied to medical environments.

[0042] 3. In a temperature-regulating medical protective nonwoven fabric, the surface of the ZnO@ZIF-8@SiO2 coating is also covered with a thermochromic coating. In use, the gain and loss of electrons in the thermochromic material causes structural changes, resulting in color changes. This allows medical personnel to intuitively sense the wearer's body temperature from the color change of the fabric and provide corresponding services. Therefore, through an effective sensing mechanism, the present invention provides real-time temperature feedback, improving the work efficiency of medical personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flow chart of the method steps of the present invention.

[0044] Figure 2 It is a schematic diagram of radiation conduction of the present invention.

[0045] Figure 3 It is a schematic diagram of the molecular structure of the reaction between dopamine and polyethyleneimine in the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] The principle of the present invention is described as follows:

[0048] 1. In this invention, radiative cooling technology is an energy-free cooling method. Radiative cooling fabrics manage human thermal radiation by optimizing the fabric's emissivity, transmittance, and reflectivity, achieving cooling without consuming energy. In indoor scenarios, heat dissipation occurs primarily through radiation, evaporation, convection, and conduction. Normal human skin temperature is approximately 34°C, and the body radiates mid-infrared waves with wavelengths between 7μm and 14μm, peaking at around 9.5μm. Human infrared radiation accounts for over 50% of total body heat dissipation. Therefore, the primary strategy for cooling the human body indoors is to design fabrics with high infrared transmittance, making them transparent to human thermal radiation within the 7μm-14μm mid-infrared band, allowing thermal radiation to pass through the fabric almost unimpeded. Silicon dioxide (SiO2) and zinc oxide (ZnO) can both be used to prepare radiative cooling materials.

[0049] 2. In the present invention, dopamine, as a biomimetic adhesive, can form a strong coating layer on the surface of the material through oxidative self-polymerization. In addition, it can also undergo a Schiff base reaction with a compound containing an amino functional group. Polyethyleneimine is a water-soluble cationic polymer containing a large number of amine groups, which can undergo a cross-linking reaction with dopamine. Through the synergistic effect of the hydrophilic groups such as hydroxyl and amino groups in the structure after the reaction of dopamine and polyethyleneimine and the hydrogen bonding of water molecules, the hydrophilicity of the fabric surface is significantly enhanced, which can promote the dispersion and uniform distribution of silicon particles, enhance the infrared emission of the material at these wavelengths, and then efficiently dissipate the internal heat radiation to the cold outside, thereby achieving cooling.

[0050] 3. In the present invention, the flash-steamed nonwoven fabric is made of HDPE fiber and has the characteristics of light weight, high strength, tear resistance and high barrier, making it suitable as medical protective clothing. In the ZnO@ZIF-8@SiO2 coating, the ZIF-8 metal-organic framework is a crystalline porous material with a high specific surface area, structural diversity and customizability. Due to the unique polyhedral morphology and porous structure of ZIF-8, the ZnO@ZIF-8@SiO2 coating exhibits high emissivity in the infrared range, mainly from Si-O-Si stretching vibration, Si-CH3 bending vibration and phonon polarization resonance of silica in the atmospheric transparent window. When infrared radiation is emitted to the coating, the phonon vibration mode in the coating resonates with the infrared radiation, allowing the coating to more effectively convert the absorbed infrared radiation energy into its own vibration energy, which is then re-emitted as infrared radiation. As the emitted infrared radiation energy increases, the temperature of the coating surface will correspondingly decrease, thereby achieving a cooling effect.

[0051] 4. In the present invention, the material of the temperature-sensitive color-changing coating is prepared from octadecyl acrylate, crystal violet lactone, and bisphenol A. Its color-changing mechanism is the gain and loss mechanism of electrons, that is, when the external temperature changes, the solvent substance undergoes a phase change, and crystal violet lactone as an electron donor and bisphenol A as an electron acceptor gain and lose electrons in the environment provided by the solvent octadecyl acrylate, causing the material structure to change, thereby producing a change in color.

[0052] The structure of bisphenol A shows that the oxygen atom and the benzene ring are conjugated in a P-π bond. In the large π bond, the addition of the oxygen atom increases the electron cloud density of the benzene ring, thereby increasing the strength of the conjugated bond, while weakening the molecular bond between the oxygen atom and the hydrogen atom, making it easy for the hydrogen atom to fall off. The structure of crystal violet lactone shows that the substance contains a lactone ring. Since the electronegativity of oxygen is stronger than that of carbon, the central carbon atom of the ester ring is electrophilic.

[0053] When the ambient temperature is lower than the melting point of the solvent, the system is in solid state, the molecular thermal motion is slow, which promotes electron transfer, the crystal violet lactone ring opens and combines with the hydrogen ion of bisphenol A to form a conjugated large π bond and a quinone-type colored group, and the system appears red; on the contrary, when the temperature is higher than the melting point, the system is in liquid state, the thermal motion is fast, which inhibits electron transfer, the lactone ring closes, the conjugated system disappears, and the system is colorless, thereby realizing the color change of the fabric surface.

[0054] Example 1:

[0055] See also Figure 1 ,

[0056] Step 1: ultrasonically clean the flash-steamed nonwoven fabric for 5 minutes to remove dirt, impurities and residues on the surface of the material, and then naturally dry it until there is no moisture on the surface to obtain a dry flash-steamed nonwoven fabric;

[0057] Step 2: Dissolve 0.6 g of tris (hydroxymethyl)aminomethane (Tris) in 100 mL of deionized water and adjust the pH to 8.5 with dilute hydrochloric acid to obtain a buffer solution;

[0058] Step 3: Add 0.3 g of dopamine (DA) and 0.6 g of polyethyleneimine (PEI) to the buffer solution and mix them evenly. Then, immerse the dry flash-steamed nonwoven fabric in the buffer solution and stir it at room temperature of 25°C for 12 hours. Then, take it out, wash it, and dry it to obtain a hydrophilic flash-steamed nonwoven fabric.

[0059] Step 4: Place 0.5 g of nano zinc oxide into 30 mL of deionized water and stir until the particles are uniform and well dispersed, thereby obtaining a zinc oxide dispersion.

[0060] Step 5: Dissolve 1.5 g of 2-methylimidazole in 90 mL of N,N-dimethylformamide (DMF) to obtain solution A; then add the zinc oxide dispersion dropwise to solution A and stir at room temperature (25°C-26°C) for 24 hours. Then, centrifuge and wash with ethanol to remove residual 2-methylimidazole, N,N-dimethylformamide and other impurities. Then, vacuum dry in an 80°C oven for 6 hours to obtain ZnO@ZIF-8 particles.

[0061] Step 6: Disperse 0.5 g of ZnO@ZIF-8 particles in 100 mL of ethanol, then add 25 mL of water (the pH value of water is preferably 11) and mix to obtain solution B; then add 2 mL of tetraethyl orthosilicate to solution B and react for 12 hours, followed by centrifugation and washing with ethanol to remove residual tetraethyl orthosilicate and other impurities, and then vacuum dry in an 80°C oven for 6 hours to obtain ZnO@ZIF-8@SiO2 particles;

[0062] Step 7: After evenly mixing 5 g of ZnO@ZIF-8@SiO2 particles, 5 g of adhesive, and 5 mL of deionized water, the mixture was evenly coated on a hydrophilic flash-steamed nonwoven fabric and dried in an oven at 60 ° C for 30 minutes to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiation-cooled flash-steamed nonwoven fabric.

[0063] Step 8: After mixing crystal violet lactone, bisphenol A and octadecyl acrylate in a ratio of 1:3:70, spray the mixture evenly onto the radiation cooling flash steamed nonwoven fabric and dry it in an oven at 60°C for 30 minutes to obtain a radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0064] Example 2:

[0065] The basic content is the same as Example 1, except that:

[0066] Step 1: ultrasonically clean the flash-steamed nonwoven fabric for 6 minutes to remove dirt, impurities and residues on the surface of the material, and then naturally dry it until there is no moisture on the surface to obtain a dry flash-steamed nonwoven fabric;

[0067] Step 2: Dissolve 0.6 g of tris (hydroxymethyl)aminomethane (Tris) in 100 mL of deionized water and adjust the pH to 8.5 with dilute hydrochloric acid to obtain a buffer solution;

[0068] Step 3: Add 0.4 g dopamine (DA) and 0.6 g polyethyleneimine (PEI) to the buffer solution and mix them evenly. Then, immerse the dry flash-steamed nonwoven fabric in the buffer solution and stir it at room temperature of 25°C for 12 hours. Then, take it out, wash it, and dry it to obtain a hydrophilic flash-steamed nonwoven fabric.

[0069] Step 4: Place 2 g of nano zinc oxide into 100 mL of deionized water and stir to disperse until the appearance is uniform and the particles are well dispersed, to obtain a zinc oxide dispersion with a preparation mass fraction of 2%;

[0070] Step 5: Dissolve 2 g of 2-methylimidazole in 90 mL of N,N-dimethylformamide (DMF) to obtain solution A; then add the zinc oxide dispersion dropwise to solution A and stir at room temperature (25°C) for 23 hours. Then, centrifuge and wash with a 1:1 mixture of ethanol and distilled water to remove residual 2-methylimidazole, N,N-dimethylformamide and other impurities. Then, vacuum dry in an oven at 85°C for 7 hours to obtain ZnO@ZIF-8 particles.

[0071] Step 6: Disperse 0.5 g of ZnO@ZIF-8 particles in 90 mL of ethanol, then add 30 mL of water (the pH value of water is preferably 11) and mix to obtain solution B; then add 3 mL of tetraethyl orthosilicate to solution B and react for 11 hours, followed by centrifugation and washing with ethanol to remove residual tetraethyl orthosilicate and other impurities, and then vacuum dry in an 80°C oven for 7 hours to obtain ZnO@ZIF-8@SiO2 particles;

[0072] Step 7: After uniformly mixing 6 g of ZnO@ZIF-8@SiO2 particles, 6 g of polyvinyl alcohol, and 6 mL of deionized water, the mixture was evenly coated on a hydrophilic flash-steamed nonwoven fabric and dried in an oven at 65 °C for 30 minutes to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiation-cooled flash-steamed nonwoven fabric.

[0073] Step 8: Mix crystal violet lactone, 1-naphthol, and 4-benzyloxyphenylethyl caproate in a ratio of 1:2:70, spray the mixture evenly onto the radiation cooling flash steamed nonwoven fabric, and dry it in an oven at 65°C for 35 minutes to obtain a radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0074] Example 3:

[0075] The basic content is the same as Example 1, except that:

[0076] Step 1: ultrasonically clean the flash-steamed nonwoven fabric for 5-6 minutes to remove dirt, impurities and residues on the surface of the material, and then naturally dry it until there is no moisture on the surface to obtain a dry flash-steamed nonwoven fabric;

[0077] Step 2: Dissolve 0.6 g of tris (hydroxymethyl)aminomethane (Tris) in 100 mL of deionized water and adjust the pH to 8.5 with dilute hydrochloric acid to obtain a buffer solution;

[0078] Step 3: Add 0.5 g of dopamine (DA) and 0.9 g of polyethyleneimine (PEI) to the buffer solution and mix them evenly. Then, immerse the dry flash-steamed nonwoven fabric in the buffer solution and stir it at room temperature of 24°C for 11 hours. Then, take it out, wash it, and dry it to obtain a hydrophilic flash-steamed nonwoven fabric.

[0079] Step 4: Place 1g of nano zinc oxide into 100mL of deionized water and stir to disperse until the appearance is uniform and the particles are well dispersed, to obtain a zinc oxide dispersion with a preparation mass fraction of 1%;

[0080] Step 5: Dissolve 4 g of 2-methylimidazole in 150 mL of N,N-dimethylformamide (DMF) to obtain solution A; then add the zinc oxide dispersion dropwise to solution A and stir at room temperature (26°C) for 24 hours. Then, centrifuge and wash with ethanol to remove residual 2-methylimidazole, N,N-dimethylformamide and other impurities. Then, vacuum dry in an oven at 85°C for 7 hours to obtain ZnO@ZIF-8 particles.

[0081] Step 6: Disperse 0.6 g of ZnO@ZIF-8 particles in 100 mL of ethanol, then add 20 mL of water (the pH value of water is preferably 11) and mix to obtain solution B; then add 4 mL of tetraethyl orthosilicate to solution B and react for 11.5 hours, followed by centrifugation and washing with ethanol to remove residual tetraethyl orthosilicate and other impurities, and then vacuum dry in an 80°C oven for 6 hours to obtain ZnO@ZIF-8@SiO2 particles;

[0082] Step 7: After uniformly mixing 6 g of ZnO@ZIF-8@SiO2 particles, 6 g of acrylic composite emulsion, and 8 mL of deionized water, the mixture was evenly coated on a hydrophilic flash-steamed nonwoven fabric and dried in an oven at 65°C for 35 minutes to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiation-cooled flash-steamed nonwoven fabric.

[0083] Step 8: After mixing crystal violet lactone, bisphenol S, and 1-octadecanoic acid in a ratio of 1:4:70, spray the mixture evenly onto the radiation cooling flash steamed nonwoven fabric and dry it in an oven at 65°C for 30 minutes to obtain a radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0084] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a medical protective nonwoven fabric with temperature regulation, characterized in that: The preparation method comprises the following steps: Step 1: ultrasonically cleaning and drying the flash-steamed nonwoven fabric to obtain a dry flash-steamed nonwoven fabric; Step 2: dissolving tris(hydroxymethyl)aminomethane in deionized water and adjusting the pH value with dilute hydrochloric acid to obtain a buffer solution; Step 3: adding dopamine and polyethyleneimine to a buffer solution and mixing them evenly, immersing the dry flash-steamed nonwoven fabric therein and stirring at room temperature to obtain a hydrophilic flash-steamed nonwoven fabric; Step 4: placing nano zinc oxide into deionized water and stirring to disperse it to obtain a zinc oxide dispersion; Step 5: Dissolve 2-methylimidazole in N,N-dimethylformamide to obtain solution A; then add the zinc oxide dispersion dropwise to solution A and stir at room temperature, then centrifuge and wash with ethanol and vacuum dry to obtain ZnO@ZIF-8 particles; Step 6: Disperse the ZnO@ZIF-8 particles in ethanol, then add water and mix to obtain solution B; then add tetraethyl orthosilicate to solution B for reaction, followed by centrifugation, washing with ethanol, and vacuum drying to obtain ZnO@ZIF-8@SiO2 particles; Step 7: After uniformly mixing the ZnO@ZIF-8@SiO2 particles, the adhesive, and the deionized water, the mixture is coated on the hydrophilic flash-steamed nonwoven fabric and dried to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiative cooling flash-steamed nonwoven fabric.

2. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1, characterized in that: After step seven, the method further includes: Step 8: Evenly spray the temperature-sensitive color-changing material onto the radiation cooling flash steamed nonwoven fabric and dry it to obtain the radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

3. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1 or 2, characterized in that: The ratio of tris(hydroxymethyl)aminomethane to deionized water in step 2 is: 0.6 g: 100 mL; The pH value in step 2 is adjusted in the range of 8-9.

4. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1 or 2, characterized in that: The mass ratio of dopamine to polyethyleneimine in step 3 is 1:2; The room temperature in step 3 is 24°C-25°C; The stirring time in step 3 is 11-12 hours.

5. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1 or 2, characterized in that: The mass fraction of nano zinc oxide in the zinc oxide dispersion in step 4 is 0.5%-2%.

6. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1 or 2, characterized in that: The mass ratio of 2-methylimidazole to N,N-dimethylformamide in step 5 is 1:50-1:70; The mass ratio of the zinc oxide dispersion in step 5 to solution A is 1:4-1:2; The room temperature in step 5 is 25°C-26°C; The stirring time in step 5 is 23-24 hours.

7. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1 or 2, characterized in that: The ratio of ZnO@ZIF-8 particles to ethanol in step 6 is: 0.4 g: 110 ml - 0.4 g: 90 ml; The mass ratio of water to solution B in step 6 is 1:4; The mass ratio of tetraethyl orthosilicate to solution B in step 6 is 1:70-1:50; The reaction time in step six is ​​11-12 hours.

8. The method for preparing a medical protective nonwoven fabric with temperature regulation according to claim 1 or 2, characterized in that: The mass ratio of ZnO@ZIF-8@SiO2 particles, binder and deionized water in step 7 is 1:1:1 or 1:1:1.1-1.5; The drying in step seven refers to: drying in an oven at 60°C-65°C for 30-35 minutes; The adhesive in step seven includes any one or any combination of polyvinyl alcohol or acrylic composite emulsion.

9. A medical protective nonwoven fabric with temperature regulation obtained by the preparation method of claim 1, characterized in that: The nonwoven fabric is a flash-steamed nonwoven fabric that is transparent to thermal radiation in the mid-infrared band of 7-14 μm emitted by the human body under indoor conditions and has a radiation cooling effect; the nonwoven fabric includes a flash-steamed nonwoven fabric substrate and a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash-steamed nonwoven fabric substrate.

10. A medical protective nonwoven fabric with temperature regulation obtained by the preparation method of claim 2, characterized in that: The nonwoven fabric comprises a flash-steamed nonwoven fabric substrate, a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash-steamed nonwoven fabric substrate, and a temperature-sensitive color-changing coating attached to the surface of the ZnO@ZIF-8@SiO2 coating; The preparation materials of the temperature-sensitive color-changing coating include a leucochrome agent, a developer, and a low-polarity organic solvent; The mass ratio of the leuco agent, the developer and the low-polarity organic solvent is 1:2-4:70; The leucochrome agent includes crystal violet lactone; The developer includes any one of bisphenol A, 1-naphthol, bisphenol S, and bisphenol AF; The low-polarity organic solvent includes any one of octadecyl acrylate, 4-benzyloxyphenylethyl caproate, 1-octadecanoic acid, and phenyl benzoate.

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