Preparation method of medical protective non-woven fabric with temperature regulation function and non-woven fabric

Abstract

According to the preparation method of the medical protective non-woven fabric with the temperature regulation function and the non-woven fabric, the hydrophilicity of the surface of the fabric is enhanced through the reaction of dopamine and polyethyleneimine, so that silicon particles can be uniformly distributed on the flash-evaporation non-woven fabric, the infrared emission performance of the flash-evaporation non-woven fabric in a specific wavelength range is optimized, and the infrared emission performance of the flash-evaporation non-woven fabric is improved. The thermal radiation penetrability of the coating is improved, accumulation of human body infrared radiation in the protective clothing is reduced, so that the effects of radiation refrigeration and human body temperature reduction are achieved, and the flash evaporation non-woven fabric is suitable for being used as a medical material due to the fact that the anti-virus performance and the biochemical barrier effect of the flash evaporation non-woven fabric are good. Therefore, the heat radiation device is good in heat radiation penetrability and suitable for the medical environment.

Description

Technical Field

[0001] The invention relates to a preparation process of a nonwoven fabric for medical protection, belongs to the field of medical equipment, and in particular to a preparation method of a nonwoven fabric for medical protection 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 air permeability. Wearing it for a long time can easily cause the wearer's body temperature to rise, leading to stuffiness, sweating and even heat stroke, and there is a lack of 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] The patent document with application date of May 6, 2020 and application number of 202010452580.3 discloses a radiation cooling coating and its application, radiation cooling coating, and textiles, which are composed of two functional layers. The two functional coatings mainly reflect visible light and infrared light in sunlight and optimize ultraviolet light to reduce heat absorption, etc. Although this solution can reduce the absorption of light and achieve the effect of cooling, the heat absorbed by the exogenous light source is less in indoor conditions, and the heat dissipation of the human body is mainly carried out through radiation, evaporation, convection and conduction. Therefore, improving the emissivity, transmittance and reflectivity of the material from the inside to the outside to manage human thermal radiation is the only technical direction; this solution is not suitable for indoor conditions, and due to the sterility requirements in the operating room, the antiviral performance and biochemical barrier effect of the protective clothing material are required to be high, and ordinary materials are difficult to have the above functions. Therefore, there is an urgent need for a means that can not only effectively improve the thermal radiation penetration of the material, but also meet the medical environment to solve the above defects in 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 that the thermal radiation penetrability is poor and cannot 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 environment 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: 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 into 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 the nano zinc oxide to obtain a zinc oxide dispersion; Step 5, dissolving 2-methylimidazole in N,N-dimethylformamide to obtain solution A; then dropping the zinc oxide dispersion into solution A, stirring at room temperature, then centrifuging and washing with ethanol and vacuum drying to obtain ZnO@ZIF-8 particles; Step 6: Disperse ZnO@ZIF-8 particles in ethanol, then add water to mix, to obtain solution B; then add tetraethyl orthosilicate to solution B for reaction, then centrifuge and wash with ethanol and then vacuum dry 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 radiation cooling flash-steamed nonwoven fabric.

[0006] After step seven, the method further includes: Step 8: spray the temperature-sensitive color-changing material evenly onto the radiation cooling flash steamed nonwoven fabric and dry it to obtain the radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0007] The ratio of tris(hydroxymethyl)aminomethane to deionized water in step 2 is: 0.6 g: 100 mL; The adjustment range of the pH value in step 2 is: 8-9.

[0008] 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.

[0009] The mass fraction of nano zinc oxide in the zinc oxide dispersion in step 4 is 0.5%-2%.

[0010] 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.

[0011] 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.

[0012] 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 7 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.

[0013] A medical protective nonwoven fabric with temperature regulation function, wherein the nonwoven fabric is a flash-steamed nonwoven fabric which is transparent to mid-infrared thermal radiation in the infrared range of 7-14 μm emitted by the human body under indoor conditions and has a radiation 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.

[0014] The nonwoven fabric comprises a flash nonwoven fabric substrate, a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash 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 leucochromic agent, a developer, and a low-polarity organic solvent; The mass ratio of the leucochrome 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 caprylate, 1-octadecanoic acid, and phenyl benzoate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the preparation method of a medical protective nonwoven fabric with temperature regulation of the present invention, the hydrophilicity of the fabric surface is enhanced by the reaction of dopamine and polyethyleneimine, so that the silicon particles can be evenly distributed on the flash 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 radiation cooling and reducing the temperature of the human body. In addition, since the flash nonwoven fabric has good antiviral properties and biochemical barrier effects, it is suitable for use as a medical material. Therefore, the present invention not only has good thermal radiation penetration, but is also suitable for medical environments.

[0016] 2. A medical protective nonwoven fabric with temperature regulation of the present invention comprises a flash nonwoven fabric substrate and a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash nonwoven fabric substrate; in the application of the present invention, the flash nonwoven fabric has the characteristics of light weight, high strength, tear resistance and high barrier, and is suitable for use as medical protective clothing, and 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, and the polarization resonance enhances the coating to 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 nonwoven fabrics with the functions of radiation refrigeration materials, and can be used in medical environments.

[0017] 3. In a medical protective nonwoven fabric with temperature regulation of the present invention, the surface of the ZnO@ZIF-8@SiO2 coating is also covered with a temperature-sensitive color-changing coating; in the application of the present invention, the gain and loss of electrons in the temperature-sensitive color-changing material causes the material structure to change, thereby producing a change in color, so that medical staff can intuitively perceive the wearer's body temperature change from the color change of the fabric, and then provide corresponding services. Therefore, the present invention provides real-time temperature feedback through an effective perception mechanism, thereby improving the work efficiency of medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the method steps of the present invention.

[0019] Figure 2 It is a schematic diagram of radiation conduction of the present invention.

[0020] Figure 3 It is a schematic diagram of the molecular structure of the reaction between dopamine and polyethyleneimine in the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The principle of the present invention is described as follows: 1. In the present invention, radiation cooling technology is an energy-free cooling method. Radiative cooling fabrics manage human thermal radiation by optimizing the emissivity, transmittance and reflectivity of the fabrics, and achieve cooling without consuming energy. In indoor scenes, the heat dissipation of the human body is mainly carried out through radiation, evaporation, convection and conduction. The normal skin temperature of the human body is about 34°C, and the mid-infrared wave with a wavelength of 7μm-14μm is radiated outward, with a peak value of about 9.5μm. The infrared radiation of the human body accounts for more than 50% of the heat dissipation of the whole body. Therefore, the main strategy for cooling the human body indoors is to design a fabric with high infrared transmittance, so that the fabric is transparent to human thermal radiation in the mid-infrared band of 7μm-14μm, so that the thermal radiation of the human body can be transmitted through the fabric almost unimpeded. Silicon dioxide (SiO2) and zinc oxide (ZnO) can be used for the preparation of radiation cooling materials.

[0023] 2. In the present invention, dopamine, as a bionic 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.

[0024] 3. In the present invention, the flash nonwoven fabric is prepared by HDPE fiber, which has the characteristics of light weight, high strength, tear resistance and high barrier, and is suitable as medical protective clothing; and in the ZnO@ZIF-8@SiO2 coating, the ZIF-8 metal-organic framework is a crystalline porous material with high specific surface area, structural diversity and customizability, ZIF-8 has a unique polyhedral morphology and porous structure, and 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 silicon dioxide in the atmospheric transparent window. 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.

[0025] 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, and 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 the crystal violet lactone as the electron donor and the bisphenol A as the 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.

[0026] From the structure of bisphenol A, we can see that the oxygen atom and the benzene ring are conjugated in the P-π bond. In the large π bond, the addition of the oxygen atom enhances the electron cloud density of the benzene ring, thereby increasing the strength of the conjugated bond and weakening the molecular bond between the oxygen atom and the hydrogen atom, making it easy for the hydrogen atom to fall off. From the structure of crystal violet lactone, we can find 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.

[0027] 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 ions of bisphenol A to form a conjugated large π bond and a quinone-type colored group, and the system appears red; conversely, 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 achieving color change on the fabric surface.

[0028] Embodiment 1: See also Figure 1 , 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 dry it naturally until there is no moisture on the surface to obtain a dry flash-steamed nonwoven fabric; Step 2: Dissolve 0.6 g of tris (hydroxymethyl)aminomethane (Tris) in 100 mL of deionized water, and adjust the pH value to 8.5 with dilute hydrochloric acid to obtain a buffer solution; Step 3, after adding 0.3 g dopamine (DA) and 0.6 g polyethyleneimine (PEI) into the buffer solution and mixing evenly, immersing the dry flash-steamed nonwoven fabric therein and stirring at room temperature of 25° C. for 12 hours, taking it out, washing and drying it, and obtaining a hydrophilic flash-steamed nonwoven fabric; Step 4: Place 0.5 g of nano zinc oxide into 30 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; 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 of 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 oven at 80°C for 6 hours to obtain ZnO@ZIF-8 particles; 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) to mix, and obtain solution B; then add 2 mL of tetraethyl orthosilicate to solution B and react for 12 hours, then centrifuge and wash with ethanol to remove residual tetraethyl orthosilicate and other impurities, and then vacuum dry in an oven at 80°C for 6 hours to obtain ZnO@ZIF-8@SiO2 particles; Step 7: Evenly mix 5 g of ZnO@ZIF-8@SiO2 particles, 5 g of adhesive, and 5 mL of deionized water, evenly coat them on the hydrophilic flash nonwoven fabric, and dry them in an oven at 60°C for 30 minutes to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiation cooling flash nonwoven fabric.

[0029] 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 the radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0030] Embodiment 2: The basic content is the same as that of Example 1, except that: 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 dry it naturally until there is no moisture on the surface to obtain a dry flash-steamed nonwoven fabric; Step 2: Dissolve 0.6 g of tris (hydroxymethyl)aminomethane (Tris) in 100 mL of deionized water, and adjust the pH value to 8.5 with dilute hydrochloric acid to obtain a buffer solution; Step 3, after adding 0.4 g dopamine (DA) and 0.6 g polyethyleneimine (PEI) into the buffer solution and mixing evenly, immersing the dry flash-steamed nonwoven fabric therein and stirring at room temperature of 25° C. for 12 hours, taking it out, washing and drying it, and obtaining a hydrophilic flash-steamed nonwoven fabric; 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%; 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 mixed solution 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; 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) to mix to obtain solution B; then add 3 mL of tetraethyl orthosilicate to solution B to react for 11 hours, then centrifuge and wash with ethanol to remove residual tetraethyl orthosilicate and other impurities, then vacuum dry in an oven at 80°C for 7 hours to obtain ZnO@ZIF-8@SiO2 particles; Step 7: Evenly mix 6 g of ZnO@ZIF-8@SiO2 particles, 6 g of polyvinyl alcohol, and 6 mL of deionized water, evenly coat them on the hydrophilic flash nonwoven fabric, and dry them in an oven at 65°C for 30 minutes to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiation cooling flash nonwoven fabric.

[0031] Step 8: Mix crystal violet lactone, 1-naphthol and 4-benzyloxyphenylethyl caprate in a ratio of 1:2:70, spray evenly onto the radiation cooling flash steamed nonwoven fabric and dry in an oven at 65°C for 35 minutes to obtain the radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0032] Embodiment 3: The basic content is the same as that of Example 1, except that: 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 dry it naturally until there is no moisture on the surface to obtain a dry flash-steamed nonwoven fabric; Step 2: Dissolve 0.6 g of tris (hydroxymethyl)aminomethane (Tris) in 100 mL of deionized water, and adjust the pH value to 8.5 with dilute hydrochloric acid to obtain a buffer solution; Step 3, after adding 0.5 g dopamine (DA) and 0.9 g polyethyleneimine (PEI) into the buffer solution and mixing evenly, immersing the dry flash-steamed nonwoven fabric therein and stirring at room temperature 24°C for 11 hours, taking it out, washing and drying it, and obtaining a hydrophilic flash-steamed nonwoven fabric; Step 4: Place 1 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, thereby obtaining a zinc oxide dispersion with a preparation mass fraction of 1%; 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; 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) to mix to obtain solution B; then add 4 mL of tetraethyl orthosilicate to solution B and react for 11.5 hours, then centrifuge and wash with ethanol to remove residual tetraethyl orthosilicate and other impurities, then vacuum dry in an oven at 80°C for 6 hours to obtain ZnO@ZIF-8@SiO2 particles; Step 7: Evenly mix 6 g of ZnO@ZIF-8@SiO2 particles, 6 g of acrylic composite emulsion, and 8 mL of deionized water, evenly coat them on the hydrophilic flash nonwoven fabric, and dry them in an oven at 65°C for 35 minutes to form a ZnO@ZIF-8@SiO2 coating, thereby obtaining a radiation cooling flash nonwoven fabric.

[0033] Step 8: Mix crystal violet lactone, bisphenol S and 1-octadecanoic acid in a ratio of 1:4:70, spray them evenly on the radiation cooling flash steamed nonwoven fabric and dry them in an oven at 65°C for 30 minutes to obtain the radiation cooling temperature-sensitive color-changing flash steamed nonwoven fabric.

[0034] 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 limitations on the present invention. A person skilled in the art may change, modify, replace and vary 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 into 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 the nano zinc oxide to obtain a zinc oxide dispersion; Step 5, dissolving 2-methylimidazole in N,N-dimethylformamide to obtain solution A; then dropping the zinc oxide dispersion into solution A, stirring at room temperature, then centrifuging and washing with ethanol and vacuum drying to obtain ZnO@ZIF-8 particles; Step 6: Disperse ZnO@ZIF-8 particles in ethanol, then add water to mix, to obtain solution B; then add tetraethyl orthosilicate to solution B for reaction, then centrifuge and wash with ethanol and then vacuum dry 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 radiation 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: spray the temperature-sensitive color-changing material evenly 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. A 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 adjustment range of the pH value in step 2 is: 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 7 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 nonwoven fabric for medical protection with temperature regulation obtained by the preparation method of claim 1, characterized in that: The nonwoven fabric is a flash-steamed nonwoven fabric which is transparent to mid-infrared thermal radiation in the infrared range of 7-14 μm emitted by the human body under indoor conditions and has a radiation 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.

10. A nonwoven fabric for medical protection with temperature regulation obtained by the preparation method of claim 2, characterized in that: The nonwoven fabric comprises a flash nonwoven fabric substrate, a ZnO@ZIF-8@SiO2 coating attached to the surface of the flash 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 leucochromic agent, a developer, and a low-polarity organic solvent; The mass ratio of the leucochrome 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 caprylate, 1-octadecanoic acid, and phenyl benzoate.

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