A nanofiber membrane for conformal packaging and a method of making

Abstract

The application discloses a kind of nanofiber membrane for conformal packaging and preparation method, it belongs to precision instrument packaging material field, wherein, the preparation method of nanofiber membrane includes the following steps: biomass glue is added to first solvent with plant and is stirred, ultrasonic treatment, then is centrifuged and freeze-dried, obtain biomass glue;Polymer matrix material is added to second solvent and is dissolved, then the biomass glue is added and is mixed, obtain spinning precursor liquid;The spinning precursor liquid is electrospun, obtain nanofiber membrane;The nanofiber membrane is exposed in the vapor of crosslinking agent volatilization and carries out crosslinking reaction, obtain crosslinked nanofiber membrane.The crosslinked nanofiber membrane prepared by the application has superfast shrinkage response to water vapor, has the characteristics of high conformability and high adhesion, can meet the demand of modern packaging industry to high efficiency, environmental protection and intelligent, has good application prospect in precision instrument packaging field.

Description

Technical Field

[0001] This invention relates to the field of precision instrument packaging materials, specifically a nanofiber membrane for conformal packaging and its preparation method. Background Technology

[0002] Packaging materials occupy a vital position in the packaging industry, serving as key factors in driving packaging technology development, improving packaging quality, and reducing packaging costs. In the current industrial system, packaging materials play multiple roles, providing not only basic protective functions such as moisture protection, shock absorption, and mildew prevention, but also increasingly incorporating diverse characteristics such as intelligence and aesthetics. As a primary material in the packaging industry, plastic materials, with their continuously increasing usage, are generating harmful substances during production, use, and disposal, causing serious damage to soil, water sources, and the ecological environment. Simultaneously, rapid industrialization and diversified consumer demands are placing higher requirements on packaging materials. Therefore, developing new, environmentally friendly, and intelligent packaging materials has become an urgent problem to be solved by the packaging industry.

[0003] Intelligent packaging materials, a research hotspot in recent years, demonstrate enormous application potential by achieving adaptive packaging for objects of different shapes through material selection. For example, soft elastomers and shape memory materials can closely conform to tissue interfaces, adapt to dynamic environmental changes, and provide seamless packaging for specific target organs. However, these materials usually require pre-customization, and their performance may be affected under certain conditions, such as changes in ambient temperature. On the other hand, shrink-shape adaptive packaging made of rigid, heat-shrinkable polymers can achieve shape adaptation under thermal stimulation, but this material has high requirements for ambient temperature and may exhibit slow shrinkage or instability at low temperatures. Water, as a benign stimulant, and some materials in nature, such as spider silk, exhibit unique hypershrinkage phenomena induced by water, provide new ideas for the intelligent design of packaging materials. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a nanofiber membrane for conformal packaging, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A method for preparing a nanofiber membrane for conformal packaging includes the following steps:

[0007] Plants containing biomass gum are added to a first solvent and stirred, ultrasonically treated, and then centrifuged and freeze-dried to obtain biomass gum;

[0008] The polymer matrix material is added to a second solvent for dissolution, and then the biomass adhesive is added and mixed to obtain a spinning precursor solution.

[0009] The spinning precursor solution was electrospinned to obtain a nanofiber membrane.

[0010] The nanofiber membrane is exposed to the vapor of the crosslinking agent to carry out a crosslinking reaction, thereby obtaining a crosslinked nanofiber membrane.

[0011] Preferably, in the spinning precursor solution, the mass concentration of the polymer matrix material is 1%-20%, and the mass concentration of the biomass gum is 1%-5%.

[0012] Preferably, the plant containing biomass gum is one or more of the following: aloe vera, reed, seaweed, flaxseed, snow fungus, peach bark, chia seeds, and wood ear fungus.

[0013] Preferably, the plant containing biomass gum is chia seed.

[0014] Preferably, the polymer matrix material is one or more of polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyacrylonitrile, polycaprolactone, polystyrene, chitosan, gelatin, chitin, hyaluronic acid, collagen, sodium alginate, and polyvinyl alcohol.

[0015] Preferably, the first solvent is one or more of dimethylformamide, dimethylacetamide, acetone, distilled water, xylene, and ethanol.

[0016] Preferably, the second solvent is one or more of dichloromethane, acetic acid, methanol, ethyl acetate, methyl ethyl ketone, and dimethyl sulfoxide.

[0017] Preferably, the crosslinking agent is one or more of formaldehyde, acetaldehyde, glyoxal, succinaldehyde, glutaraldehyde, acetone, and polypropylene glycol glycidyl ether.

[0018] Another objective of this invention is to provide a nanofiber membrane prepared by the above-described method.

[0019] Another objective of this invention is to provide an application of the above-mentioned nanofiber membrane as a conformal packaging material.

[0020] The present invention provides a method for preparing nanofiber membranes by selecting plants containing biomass gum as raw materials, separating the biomass gum using ultrasonic treatment, and combining it with electrospinning technology to produce nanofiber membranes. The nanofiber membranes prepared by the present invention have an ultra-fast shrinkage response to water vapor, and are characterized by high conformability and high adhesion. They can meet the needs of the modern packaging industry for high efficiency, environmental protection and intelligence, realize the water vapor response of nanofiber membranes and conformal packaging for precision instruments, and have good application prospects in the field of precision instrument packaging. Attached Figure Description

[0021] Figure 1 These are scanning electron microscope (SEM) images of the nanofiber membranes prepared in Examples 1-3 and Comparative Example 1 of the present invention.

[0022] Figure 2 The graph shows the test results of the weight gain rate and volume shrinkage rate of the nanofiber membrane prepared in Example 3 of the present invention under different environmental humidity conditions.

[0023] Figure 3 Optical images of the nanofiber membrane conformally bonded to different material surfaces as prepared in Example 3 of this invention.

[0024] Figure 4 The figure shows the adhesion performance test results of the nanofiber membrane prepared in Example 3 of the present invention under the overlap shear test. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] In one embodiment of the present invention, a method for preparing a nanofiber membrane for conformal packaging is provided, comprising the following steps:

[0027] S1. Plants containing biomass gum are added to a first solvent and stirred and ultrasonically treated, then centrifuged and freeze-dried to obtain biomass gum;

[0028] S2. The polymer matrix material is added to the second solvent for dissolution, and then the biomass adhesive is added for mixing to obtain the spinning precursor solution;

[0029] S3. Electrospin the spinning precursor solution to obtain a nanofiber membrane.

[0030] S4. The nanofiber membrane is exposed to the vapor of the crosslinking agent to carry out a crosslinking reaction, thereby obtaining a crosslinked nanofiber membrane.

[0031] Specifically, the voltage for electrospinning is 10-20kV, the receiving distance (distance from the needle to the receiving device) is 10-20cm, and the propulsion speed of the propulsion pump is 0.1-0.6mL / h.

[0032] In a preferred embodiment of the present invention, the mass concentration of the polymer matrix material in the spinning precursor solution is 1%-20%, preferably 10%-18%; and the mass concentration of the biomass gum is 1%-5%.

[0033] In a preferred embodiment of the present invention, the plant containing biomass gum is one or more of aloe vera, reed, seaweed, flaxseed, snow fungus, peach bark, chia seeds, and wood ear fungus, but is not limited thereto.

[0034] In a preferred embodiment of the present invention, the polymer matrix material is one or more of polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyacrylonitrile, polycaprolactone, polystyrene, chitosan, gelatin, chitin, hyaluronic acid, collagen, sodium alginate, and polyvinyl alcohol, but is not limited thereto.

[0035] In a preferred embodiment of the present invention, the first solvent is one or more of dimethylformamide, dimethylacetamide, acetone, distilled water, xylene, and ethanol, but is not limited thereto.

[0036] In a preferred embodiment of the present invention, the second solvent is one or more of dichloromethane, acetic acid, methanol, ethyl acetate, methyl ethyl ketone, and dimethyl sulfoxide, but is not limited thereto.

[0037] In a preferred embodiment of the present invention, the crosslinking reaction time is 1-5 hours.

[0038] In a preferred embodiment of the present invention, the crosslinking agent is one or more of formaldehyde, acetaldehyde, glyoxal, succinaldehyde, glutaraldehyde, acetone, and polypropylene glycol glycidyl ether, but is not limited thereto.

[0039] In another embodiment of the present invention, a nanofiber membrane prepared by the above preparation method is also provided, wherein the nanofiber membrane has a fiber diameter of 200-800 nm, a volume shrinkage rate of 10%-90%, and an adhesion energy of 10-30 MPa.

[0040] In another embodiment of the present invention, the above-mentioned nanofiber membrane is also provided as an application in conformal packaging material, specifically for conformal packaging of precision instruments.

[0041] In this embodiment of the invention, plants containing biomass gum are selected as raw materials, and the biomass gum is separated by ultrasonic treatment and combined with electrospinning technology to form a nanofiber membrane. The nanofiber membrane does not have conformal packaging capability when it is not in contact with water vapor. By treating the nanofiber membrane with the vapor of a crosslinking agent, the nanofiber membrane can be made to have water stability. In addition, the nanofiber membrane can undergo an ultra-fast shrinkage response when treated with water vapor, and at the same time has the characteristics of high conformability and high adhesion. This water vapor responsive nanofiber membrane provides a new idea for the packaging of precision instruments.

[0042] The following embodiments are some specific implementation examples of the present invention in practical applications, but are not limited thereto.

[0043] Example 1: This example provides a method for preparing a nanofiber membrane for conformal packaging, which includes the following steps:

[0044] S1. Chia seeds were soaked in distilled water at a mass ratio of 1:30. The mixture was then stirred with an electric stirrer at room temperature (25°C) for 3 hours. After stirring, the mixture was ultrasonically treated at a frequency of 400 kHz for 4 hours to obtain a mixed solution. The mixed solution was then centrifuged at a speed of 9000 r.pm for 20 minutes to obtain a paste. Finally, the paste was freeze-dried in a freeze dryer for 48 hours to obtain biomass gel.

[0045] S2. Add a certain amount of gelatin to an appropriate amount of glacial acetic acid, stir and mix with a magnetic stirrer for 12 hours, then add a certain amount of the above biomass gum, and continue to stir and mix with a magnetic stirrer for 12 hours to obtain a spinning pretreatment solution with a gelatin mass concentration of 15% and a biomass gum mass concentration of 1.5%.

[0046] S3. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 16 kV, the distance between the syringe and its corresponding receiving device is 15 cm, and the push pump speed is 0.6 mL / h; turn on the power supply and perform electrospinning to obtain a nanofiber membrane, denoted as CG-15.

[0047] Example 2: This example provides a method for preparing a nanofiber membrane for conformal packaging, which includes the following steps:

[0048] S1. Chia seeds were soaked in distilled water at a mass ratio of 1:30. The mixture was then stirred with an electric stirrer at room temperature (25°C) for 3 hours. After stirring, the mixture was ultrasonically treated at a frequency of 400 kHz for 4 hours to obtain a mixed solution. The mixed solution was then centrifuged at a speed of 9000 r.pm for 20 minutes to obtain a paste. Finally, the paste was freeze-dried in a freeze dryer for 48 hours to obtain biomass gel.

[0049] S2. Add a certain amount of gelatin to an appropriate amount of glacial acetic acid, stir and mix with a magnetic stirrer for 12 hours, then add a certain amount of the above biomass gum, and continue to stir and mix with a magnetic stirrer for 12 hours to obtain a spinning pretreatment solution with a gelatin mass concentration of 15% and a biomass gum mass concentration of 3%.

[0050] S3. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 16 kV, the distance between the syringe and its corresponding receiving device is 15 cm, and the push pump speed is 0.6 mL / h; turn on the power and perform electrospinning to obtain a nanofiber membrane, denoted as CG-30.

[0051] Example 3: This example provides a method for preparing a nanofiber membrane for conformal packaging, which includes the following steps:

[0052] S1. Chia seeds were soaked in distilled water at a mass ratio of 1:30. The mixture was then stirred with an electric stirrer at room temperature (25°C) for 3 hours. After stirring, the mixture was ultrasonically treated at a frequency of 400 kHz for 4 hours to obtain a mixed solution. The mixed solution was then centrifuged at a speed of 9000 r.pm for 20 minutes to obtain a paste. Finally, the paste was freeze-dried in a freeze dryer for 48 hours to obtain biomass gel.

[0053] S2. Add a certain amount of gelatin to an appropriate amount of glacial acetic acid, stir and mix with a magnetic stirrer for 12 hours, then add a certain amount of the above biomass gum, and continue to stir and mix with a magnetic stirrer for 12 hours to obtain a spinning pretreatment solution with a gelatin mass concentration of 15% and a biomass gum mass concentration of 1.5%.

[0054] S3. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 16 kV, the distance between the syringe and its corresponding receiving device is 15 cm, and the push pump speed is 0.6 mL / h; turn on the power supply and perform electrospinning to obtain a nanofiber membrane.

[0055] S4. Mix 50% glutaraldehyde solution and deionized water in a 1:1 volume ratio to prepare glutaraldehyde aqueous solution. Then expose the nanofiber membrane prepared above to the vapor of the naturally volatilized glutaraldehyde aqueous solution for crosslinking reaction for 3 hours to obtain the crosslinked nanofiber membrane, denoted as C-CG-15.

[0056] Example 4: This example provides a method for preparing a nanofiber membrane for conformal packaging, which includes the following steps:

[0057] S1. According to the mass ratio of 1:1:30, aloe vera and reed are soaked in distilled water, and then stirred with an electric stirrer at room temperature (25℃) for 3 hours. Then, the mixture is ultrasonically treated at a frequency of 400kHz for 4 hours to obtain a mixed solution. Then, the mixed solution is centrifuged at a speed of 9000r.pm for 20 minutes to obtain a paste. Finally, the paste is freeze-dried in a freeze dryer for 48 hours to obtain biomass gel.

[0058] S2. Add a certain amount of polyvinyl alcohol to an appropriate amount of dichloromethane, stir and mix with a magnetic stirrer for 12 hours, then add a certain amount of the above biomass gum, and continue to stir and mix with a magnetic stirrer for 12 hours to obtain a spinning pre-treatment solution with a polyvinyl alcohol mass concentration of 10% and a biomass gum mass concentration of 1%.

[0059] S3. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 10 kV, the distance between the syringe and its corresponding receiving device is 10 cm, and the push pump speed is 0.1 mL / h; turn on the power supply and perform electrospinning to obtain a nanofiber membrane.

[0060] Example 5: This example provides a method for preparing a nanofiber membrane for conformal packaging, which includes the following steps:

[0061] S1. Flaxseeds were soaked in distilled water at a mass ratio of 1:30. The mixture was then stirred with an electric stirrer at room temperature (25°C) for 3 hours. After stirring, the mixture was ultrasonically treated at a frequency of 400 kHz for 4 hours to obtain a mixed solution. The mixed solution was then centrifuged at a speed of 9000 r.pm for 20 minutes to obtain a paste. Finally, the paste was freeze-dried in a freeze dryer for 48 hours to obtain biomass gel.

[0062] S2. A certain amount of polycaprolactone is added to an appropriate amount of acetone, and the mixture is stirred and mixed for 12 hours using a magnetic stirrer. Then, a certain amount of the above-mentioned biomass gum is added, and the mixture is stirred and mixed for another 12 hours using a magnetic stirrer to obtain a spinning pretreatment solution with a polycaprolactone mass concentration of 20% and a biomass gum mass concentration of 5%.

[0063] S3. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 20 kV, the distance between the syringe and its corresponding receiving device is 20 cm, and the push pump speed is 0.3 mL / h; turn on the power supply and perform electrospinning to obtain a nanofiber membrane.

[0064] S4. The nanofiber membrane prepared above is exposed to the vapor of acetaldehyde aqueous solution with a mass fraction of 20% to carry out a cross-linking reaction for 5 hours to obtain the cross-linked nanofiber membrane.

[0065] Example 6: This example provides a method for preparing a nanofiber membrane for conformal packaging, which includes the following steps:

[0066] S1. Soak seaweed in dimethylformamide at a mass ratio of 1:30, then stir with an electric stirrer for 3 hours at room temperature (25℃), and then sonicate in an ultrasonic machine at a frequency of 400kHz for 4 hours to obtain a mixed solution; then, place the mixed solution in a centrifuge and centrifuge at a speed of 9000r.pm for 20 minutes to obtain a paste; finally, place the paste in a freeze dryer for freeze drying for 48 hours to obtain biomass gel.

[0067] S2. A certain amount of polycaprolactone is added to an appropriate amount of acetone, and the mixture is stirred and mixed for 12 hours using a magnetic stirrer. Then, a certain amount of the above-mentioned biomass gum is added, and the mixture is stirred and mixed for another 12 hours using a magnetic stirrer to obtain a spinning pretreatment solution with a polycaprolactone mass concentration of 8% and a biomass gum mass concentration of 2%.

[0068] S3. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 15 kV, the distance between the syringe and its corresponding receiving device is 15 cm, and the push pump speed is 0.4 mL / h; turn on the power supply and perform electrospinning to obtain a nanofiber membrane.

[0069] S4. The nanofiber membrane prepared above is exposed to the vapor of a 40% formaldehyde aqueous solution to carry out a cross-linking reaction for 1 hour to obtain the cross-linked nanofiber membrane.

[0070] Comparative Example 1: This comparative example provides a method for preparing a nanofiber membrane, which includes the following steps:

[0071] S1. Add a certain amount of gelatin to an appropriate amount of glacial acetic acid, stir and mix with a magnetic stirrer for 12 hours, then add a certain amount of the above biomass gum, and continue to stir and mix with a magnetic stirrer for 12 hours to obtain a spinning precursor solution with a gelatin mass concentration of 15%.

[0072] S2. Draw 5 mL of the above-mentioned spinning precursor solution with a syringe; then, fix the syringe on the push pump, connect the positive terminal of the high voltage power supply to the needle, and connect the negative terminal to the receiving device (aluminum foil); then, set the electrospinning parameters: the high voltage power supply voltage is 16 kV, the distance between the syringe and its corresponding receiving device is 15 cm, and the push pump speed is 0.6 mL / h; turn on the power supply and perform electrospinning to obtain a nanofiber membrane, denoted as CG-0.

[0073] Experimental Example: 1. The morphology of the CG-0, CG-15, CG-30, and C-CG-15 nanofiber membranes prepared in Comparative Example 1 and Examples 1-3 were observed, and the results are as follows: Figure 1 As shown in the figure, a represents the morphology of the CG-0 nanofiber membrane, b represents the morphology of the CG-15 nanofiber membrane, c represents the morphology of the CG-30 nanofiber membrane, and d represents the morphology of the C-CG-15 nanofiber membrane. The figure shows that the average diameter of the CG-0 nanofibers is 738.3 nm, forming a porous and highly interconnected nanofiber network; the average diameter of the CG-15 nanofibers is 297.2 nm; with the addition of chia seed gum, the conductivity of the spinning precursor solution increases, and the diameter of the nanofibers decreases; the average diameter of the CG-30 nanofibers is 247.1 nm, and the fiber network consists of "necklace-like" fibers; the average diameter of the C-CG-15 nanofibers is 333.4 nm; the diameter of the nanofibers increases slightly after cross-linking treatment, but the fiber morphology remains essentially unchanged.

[0074] II. The weight gain and volume shrinkage rate of the C-CG-15 nanofiber membrane prepared in Example 3 above were tested under different environmental humidity conditions. The results are as follows: Figure 2 As shown in the figure, when the ambient humidity increases from 40% to 80%, the maximum mass increase rate of the C-CG-15 nanofiber membrane is 12.3%, and the maximum volume shrinkage rate is 84%, demonstrating that the C-CG-15 nanofiber membrane exhibits high moisture sensitivity and a large volume shrinkage rate in the presence of trace amounts of moisture. Furthermore, this nanofiber membrane also demonstrates significant moisture absorption capacity, with a maximum absorption rate as high as 971%.

[0075] III. Optical images of the C-CG-15 nanofiber membrane conformally bonded to different material surfaces were observed in Example 3 above. The results are as follows: Figure 3 As shown in the figure, the C-CG-15 nanofiber membrane, exhibiting a hygroscopic shrinkage response, can conformally adhere to the threads of a bolt under the influence of moisture. Before wetting, the C-CG-15 nanofiber membrane relies on electrostatic interactions to adhere to various material surfaces. After wetting, its strong and immediate interfacial adhesion primarily originates from non-covalent interactions, including hydrogen bonds and electrostatic interactions. After wetting, the gelatin and chia seed components in the C-CG-15 nanofiber membrane form high-density hydrogen bonds with the substrate, endowing the nanofiber membrane with adhesive force, enabling it to adhere tightly to the surfaces of various materials.

[0076] IV. The adhesion properties of the C-CG-15 nanofiber membrane prepared in Example 3 above were tested under an overlap shear test, and the results are as follows: Figure 4 As shown in the figure, the overlap shear test evaluates the ability of the C-CG-15 nanofiber membrane to withstand planar stress when shear forces move two glass layers bonded by an adhesive. The adhesive used is typically subjected to shear stress within it. As can be seen from the figure, the adhesion between the C-CG-15 nanofiber membrane and the two glass sheets is strong, with a maximum adhesion strength reaching 29.7 MPa.

[0077] In summary, the nanofiber membranes with conformal shrinkage in response to water vapor prepared in the above embodiments can be used in the field of precision instrument packaging. Gelatin, with its excellent biocompatibility, hydrophilicity, and adhesion, is used as a matrix for electrospinning. Then, glutaraldehyde crosslinking improves the water stability of the nanofiber membrane. The introduction of chia seed gum during electrospinning endows the nanofiber membrane with water vapor responsiveness. The moisture sensitivity of this biomass gum material causes the nanofiber membrane to shrink rapidly under the influence of water vapor, and imparts good adhesion properties. This invention provides a nanofiber membrane for conformal packaging and its preparation method, meeting the modern packaging industry's demands for high efficiency, environmental protection, and intelligence, and has promising application prospects in precision instrument packaging.

[0078] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification.

Claims

1. A method for preparing a nanofiber membrane for conformal packaging, characterized in that, Includes the following steps: Plants containing biomass gum are added to a first solvent and stirred, ultrasonically treated, and then centrifuged and freeze-dried to obtain biomass gum; The polymer matrix material is added to a second solvent for dissolution, and then the biomass adhesive is added and mixed to obtain a spinning precursor solution. The spinning precursor solution was electrospinned to obtain a nanofiber membrane. The nanofiber membrane is exposed to the vapor of the crosslinking agent to carry out a crosslinking reaction, thereby obtaining a crosslinked nanofiber membrane; In the spinning precursor solution, the mass concentration of the polymer matrix material is 10%-18%, and the mass concentration of the biomass gum is 1%-5%. The plant containing biomass gum is chia seed; The polymer matrix material is gelatin.

2. The method for preparing the nanofiber membrane for conformal packaging according to claim 1, characterized in that, The first solvent is one or more of dimethylformamide, dimethylacetamide, acetone, distilled water, xylene, and ethanol.

3. The method for preparing the nanofiber membrane for conformal packaging according to claim 1, characterized in that, The second solvent is one or more of dichloromethane, acetic acid, methanol, ethyl acetate, methyl ethyl ketone, and dimethyl sulfoxide.

4. The method for preparing a nanofiber membrane for conformal packaging according to claim 1, characterized in that, The crosslinking agent is one or more of formaldehyde, acetaldehyde, glyoxal, succinaldehyde, glutaraldehyde, acetone, and polypropylene glycol glycidyl ether.

5. A nanofiber membrane prepared by any one of claims 1-4.

6. The application of the nanofiber membrane as described in claim 5 as a conformal packaging material.

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