Flash non-woven fabric based on nanofiber reinforcement and continuous production method thereof

Abstract

The invention provides a flash non-woven fabric based on nanofiber reinforcement and a continuous production method of the flash non-woven fabric, and belongs to the technical field of non-woven fabric preparation. Through an integrated process of material component design, flash evaporation fiber forming, in-situ reinforcement and continuous shaping, on the premise that the high porosity characteristic of the flash evaporation non-woven fabric is reserved, nano reinforced phase polyamide 6 (PA6) nanofibers are accurately distributed in a high-density polyethylene (HDPE) fiber network. By controlling the blending proportion of PA6 and an HDPE base material and electrostatic orientation pair reinforcement parameters, a nano reinforcement phase is accurately anchored at a node of an HDPE fiber net, the blockage of pores of the fiber net is avoided, a balance point of the material strength and the air permeability can be directionally regulated and controlled, and nano reinforcement-pore retention is realized through calendaring and shaping; the prepared flash non-woven fabric meets the conflicting indexes of impermeability and air permeability of traditional Chinese medicine protective materials in the EN14683 standard, and an industrial mass production scheme is provided for reusable protective clothing.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric preparation technology, specifically to a flash nonwoven fabric reinforced with nanofibers and its continuous production method. Background Technology

[0002] Flash-evaporated nonwoven fabrics, with their unique ultrafine fiber structure (fiber diameter ≤ 1 μm) and high specific surface area, have shown significant advantages in fields such as air filtration, medical protective clothing, and biological isolation materials. However, nonwoven fabrics prepared by existing flash evaporation processes generally suffer from defects such as low mechanical strength and easy fiber breakage due to weak inter-fiber bonding and insufficient orientation. In particular, they are prone to structural failure under dynamic stress or complex working conditions, which seriously restricts their application in high-pressure filtration or reusable scenarios.

[0003] Currently, the industry has proposed various improvement solutions. Among existing technologies, patent CN210362753U provides a packaging film material that uses a polyvinyl alcohol (PVA) coating to reinforce the fiber surface. While this increases tensile strength by approximately 40%, the continuous coverage of the coating material leads to a porosity reduction of over 30%, significantly sacrificing the material's inherent air permeability. Therefore, developing an in-situ reinforcement technology that can achieve synergistic control of fiber structure reinforcement and porosity in a single-phase system has become a key path to breaking through the performance ceiling of flash-evaporated nonwoven fabrics. Summary of the Invention

[0004] In view of the technical problems existing in the background art, this application provides a flash nonwoven fabric based on nanofiber reinforcement and its continuous production method, aiming to solve the problem that existing nonwoven fabric materials are difficult to achieve both strength and air permeability.

[0005] In a first aspect, this application provides a continuous production method for flash-evaporated nonwoven fabrics reinforced with nanofibers, comprising the following steps: S1. Preparation of substrate blending and spinning solution: HDPE and PA6 are added to a solvent and stirred to obtain a spinning solution; S2. Flash spinning and fiber forming: The spinning solution is spun to obtain a "PE main fiber-PA6 nanofiber" composite fiber web; S3. Hot roll calendering and setting: The composite fiber web is calendered and set to obtain nano-reinforced nonwoven fabric.

[0006] In the technical solution of this application embodiment, an integrated process of "material composition design - flash evaporation fiber formation - in-situ reinforcement - continuous setting" is used to achieve precise distribution of PA6 nanofibers as the nano-reinforcing phase in the HDPE fiber network while retaining the high porosity characteristics of the flash evaporation nonwoven fabric. By controlling the blending ratio of PA6 and HDPE substrate and the electrostatic orientation reinforcement parameters, the nano-reinforcing phase is precisely anchored at the nodes of the HDPE fiber network, avoiding clogging of the pores of the fiber network. The balance between material strength and air permeability can be directionally controlled. Then, through calendering and setting, "nano-reinforcement - porosity retention" is achieved. The resulting nanofiber-reinforced flash evaporation nonwoven fabric meets the conflicting indicators of impermeability and air permeability of medical protective materials in EN14683 standard, providing an industrial mass production solution for reusable protective clothing.

[0007] In some embodiments, in step S1, the mass ratio of HDPE to PA6 is 4~8wt%.

[0008] In this embodiment, the HDPE substrate, with its high melt flowability and hydrophobicity, ensures the formation of ultrafine fibers and a high-porosity structure during the flash evaporation process. PA6 nanofibers form a hydrogen bond network with HDPE through polar amide groups, and their high modulus enhances the interfacial bonding strength. A specific mass ratio of HDPE to PA6 allows for nanoscale dispersion of PA6, preventing pore blockage and improving tensile strength through in-situ anchoring.

[0009] In some embodiments, in step S2, the fiber-forming process in the spinning process is as follows: the spinning solution is sprayed through a slit nozzle with a slit width of 0.15 mm under a high-speed airflow of 75°C and 1~2 MPa to form ultrafine fibers.

[0010] In this embodiment, the evaporation rate of the solvent in the mixed spinning solution is controlled within 10~14 g / min under specific spinning conditions to form ultrafine fibers. Due to the phase separation effect, PA6 nanofibers are dispersed as discrete phases on the surface of HDPE fibers, forming a "nanofibers" structure, which avoids melting and adhesion between fibers. At this stage, the solvent evaporation gradient is controlled, so that PA6 nanofibers are exposed in situ on the surface as HDPE fibers are stretched, forming a "PE main fiber-PA6 nanofibers" composite structure, which provides a physical anchor for subsequent directional reinforcement.

[0011] In some embodiments, the spinning process involves applying a voltage of 20-30kV between two parallel electrode plates spaced 10cm apart, and the ultrafine fibers pass between the two parallel electrode plates to form a composite fiber web.

[0012] In this embodiment, during the fiber web formation process, electrostatic orientation reinforcement is used to enable PA6 nanofibers to migrate and anchor to the cross nodes of HDPE fibers under the drive of electrostatic force, forming a continuous three-dimensional reinforced network, and avoiding pore blockage caused by disordered accumulation of nanofibers.

[0013] In some embodiments, in step S3, the calendering and shaping instrument is a two-roll hot press, the roller temperature of the two-roll hot press is 88~92℃, the pressure of the two-roll hot press is 0.3MPa, and the linear speed of the two-roll hot press is 5~8m / min.

[0014] In this embodiment, by instantaneous calendering, the hot pressing time is controlled within 5 seconds, so that the surface of PA6 nanofibers is partially melted and forms a hydrogen bond interface with PE fibers, while avoiding overall pore collapse, and finally obtaining a nano-reinforced nonwoven fabric with both high strength and high air permeability.

[0015] In some embodiments, in step S1, the stirring temperature is 58~62℃, the stirring rate is 450~550r / min, and the stirring time is 28~32min.

[0016] In this embodiment, specific stirring conditions are used to ensure the uniformity of nanofiber pre-dispersion, forming a homogeneous spinning solution.

[0017] In some embodiments, in step S1, the concentration of the spinning solution is 7-9 wt%; the solvent is xylene solvent, and the purity of the solvent is ≥99.5%.

[0018] In this embodiment, the separation of HDPE-PA6 microphases is induced by solvent polarity regulation, so that PA6 is pre-dispersed in the HDPE matrix as a nanoscale discrete phase, avoiding nanofiber agglomeration in subsequent processes, ensuring the controllability of the reinforcing phase distribution, and laying the structural foundation for subsequent in-situ anchoring of nanofibers.

[0019] Secondly, embodiments of this application provide a flash nonwoven fabric reinforced with nanofibers, which is produced by the aforementioned continuous production method of flash nonwoven fabric reinforced with nanofibers. The longitudinal tensile strength of the flash nonwoven fabric reinforced with nanofibers is 41.3~50.1 MPa, and the air permeability of the flash nonwoven fabric reinforced with nanofibers is 90~102 L / (m²·s).

[0020] In the technical solution of this application embodiment, the flash nonwoven fabric based on nanofiber reinforcement has both good mechanical strength and air permeability.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0023] Figure 1 This is a SEM image of the flash nonwoven fabric reinforced with nanofibers prepared in Example 1. Detailed Implementation

[0024] The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms “comprising” and “having” and any variations thereof as used herein are for the purpose of describing particular embodiments only and are not intended to limit this application.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] To address the challenge of achieving both strength and breathability in existing nonwoven materials, this application provides a flash-evaporated nonwoven fabric reinforced with nanofibers and its continuous production method. Through an integrated process of "material composition design - flash-evaporation fiber formation - in-situ reinforcement - continuous shaping," the high porosity characteristics of the flash-evaporated nonwoven fabric are preserved while achieving precise distribution of PA6 nanofibers within the HDPE fiber network as the nano-reinforcing phase. By controlling the blending ratio of PA6 and HDPE substrate and the electrostatic orientation reinforcement parameters, the nano-reinforcing phase is precisely anchored at the nodes of the HDPE fiber web, avoiding clogging of the fiber web pores. This allows for directional control of the balance between material strength and air permeability. Further calendering and setting achieves "nano-reinforcement-pore retention." This continuous production method simultaneously achieves ultrafine substrate fiber processing, nanofiber reinforcement, and pore retention in a single process. Compared to traditional multi-step composite processes, it increases production efficiency by 30% and reduces energy consumption by 20%, providing a scalable technical path for the industrial continuous production of high-performance flash nonwoven fabrics. The nanofiber-reinforced flash nonwoven fabric obtained by this invention has a longitudinal tensile strength of 41.3~50.1 MPa, and an air permeability of 90~102 L / (m²·s), meeting the conflicting indicators of impermeability and air permeability of medical protective materials in EN14683 standard, providing an industrial mass production solution for reusable protective clothing.

[0028] On the one hand, this application provides a continuous production method for flash-evaporated nonwoven fabrics reinforced with nanofibers, comprising the following steps: S1. Preparation of substrate blending and spinning solution: HDPE and PA6 are added to a solvent and stirred to obtain a spinning solution; S2. Flash spinning and fiber forming: The spinning solution is spun to obtain a "PE main fiber-PA6 nanofiber" composite fiber web; S3. Hot roll calendering and setting: The composite fiber web is calendered and set to obtain nano-reinforced nonwoven fabric.

[0029] In the technical solution of this application embodiment, an integrated process of "material composition design - flash evaporation fiber formation - in-situ reinforcement - continuous setting" is used to achieve precise distribution of PA6 nanofibers in the fiber network HDPE while retaining the high porosity characteristics of flash evaporation nonwoven fabric. By controlling the blending ratio of PA6 and HDPE substrate and the electrostatic orientation reinforcement parameters, the nanofibers are precisely anchored at the nodes of the HDPE fiber network, avoiding clogging of the pores of the fiber network. The balance between material strength and air permeability can be directionally controlled. Then, through calendering and setting, "nano-reinforcement - porosity retention" is achieved. The resulting nanofiber-reinforced flash evaporation nonwoven fabric meets the conflict index of impermeability and air permeability of medical protective materials in EN14683 standard, providing an industrial mass production solution for reusable protective clothing.

[0030] Furthermore, in some embodiments, in step S1, the mass ratio of HDPE to PA6 is 4~8wt%.

[0031] In the technical solution of this application embodiment, the HDPE substrate, with its high melt flowability and hydrophobicity, ensures the formation of ultrafine fibers and a high-porosity structure during the flash evaporation process; PA6 nanofibers form a hydrogen bond network with HDPE through polar amide groups, and their high modulus enhances the interfacial bonding strength. A specific mass ratio of HDPE and PA6 allows for the nanoscale dispersion of PA6, which avoids pore blockage and enhances tensile strength through in-situ anchoring.

[0032] In some embodiments of the technical solutions of this application, in step S2, the fiber-forming process in the spinning process is as follows: the spinning solution is sprayed through a slit nozzle with a slit width of 0.15 mm under a high-speed airflow of 75°C and 1~2 MPa to form ultrafine fibers.

[0033] In the technical solution of this application embodiment, the evaporation rate of the solvent in the mixed spinning solution is controlled within 10~14g / min through specific spinning conditions to form ultrafine fibers. Due to the phase separation effect, PA6 nanofibers are dispersed as discrete phases on the surface of HDPE fibers, forming a "nanofiber" structure, which avoids the melting and adhesion between fibers. At this stage, the solvent evaporation gradient is controlled, so that PA6 nanofibers are exposed in situ on the surface as HDPE fibers are stretched, forming a "PE main fiber-PA6 nanofiber" composite structure, which provides a physical anchor point for subsequent directional reinforcement.

[0034] Furthermore, in some embodiments, the spinning process involves applying a voltage of 20-30kV between two parallel electrode plates spaced 10cm apart, and the ultrafine fibers pass between the two parallel electrode plates to form a composite fiber web.

[0035] In the technical solution of this application embodiment, during the fiber web formation process, electrostatic orientation reinforcement is used to enable PA6 nanofibers to migrate and anchor to the cross nodes of HDPE fibers under the drive of electrostatic force, forming a continuous three-dimensional reinforcement network, and avoiding pore blockage caused by disordered accumulation of nanofibers.

[0036] Furthermore, in some embodiments, in step S3, the calendering and shaping instrument is a two-roll hot press, the roller temperature of the two-roll hot press is 88~92℃, the pressure of the two-roll hot press is 0.3MPa, and the linear speed of the two-roll hot press is 5~8m / min.

[0037] By using instantaneous calendering to control the hot pressing time within 5 seconds, the surface of PA6 nanofibers is partially melted and forms a hydrogen bond interface with PE fibers, while avoiding overall pore collapse, ultimately obtaining a nano-reinforced nonwoven fabric with both high strength and high air permeability.

[0038] Furthermore, in some embodiments, in step S1, the stirring temperature is 58~62℃, the stirring rate is 450~550r / min, and the stirring time is 28~32min.

[0039] In the technical solution of this application embodiment, the uniformity of nanofiber pre-dispersion is ensured by specific stirring conditions to form a homogeneous spinning solution.

[0040] Furthermore, in some embodiments, in step S1, the concentration of the spinning solution is 7~9 wt%; the solvent is xylene solvent, and the purity of the solvent is ≥99.5%.

[0041] In the technical solution of this application embodiment, the separation of HDPE-PA6 microphases is induced by solvent polarity regulation, so that PA6 is pre-dispersed in the HDPE matrix as a nanoscale discrete phase, avoiding the agglomeration of nanofibers in subsequent processes, ensuring the controllability of the reinforcing phase distribution, and laying the structural foundation for the subsequent in-situ anchoring of nanofibers.

[0042] Secondly, embodiments of this application provide a flash nonwoven fabric reinforced with nanofibers, which is produced by the aforementioned continuous production method of flash nonwoven fabric reinforced with nanofibers. The longitudinal tensile strength of the flash nonwoven fabric reinforced with nanofibers is 41.3~50.1 MPa, and the air permeability of the flash nonwoven fabric reinforced with nanofibers is 90~102 L / (m²·s).

[0043] In the technical solution of this application embodiment, the flash nonwoven fabric based on nanofiber reinforcement has both good mechanical strength and air permeability.

[0044] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0045] Example 1 This embodiment provides a continuous production method for flash-evaporated nonwoven fabrics reinforced with nanofibers, specifically including the following steps: (1) HDPE and PA6 were added to xylene solvent with a purity of 99.5% at a ratio of 5wt%, and stirred at 500r / min for 30 minutes at 60℃ to obtain a spinning solution with a concentration of 8wt%.

[0046] (2) The spinning solution was sprayed through a slit nozzle (slit width 0.15mm) at a pressure of 1.2MPa into a flash chamber at 75℃ to obtain HDPE ultrafine fibers; two parallel plates with a spacing of 10cm were set in the fiber web forming area and a DC voltage of 25kV was applied to obtain a "PE main fiber-PA6 nanofiber" composite fiber web.

[0047] (3) The composite fiber web was instantaneously calendered using a double-roll hot press (roller temperature 90℃, pressure 0.3MPa, linear speed 20m / min) to obtain nano-reinforced nonwoven fabric.

[0048] Figure 1 This is a SEM image of the nano-reinforced nonwoven fabric prepared in this embodiment.

[0049] Depend on Figure 1 It can be seen that PA6 exists in the form of nanofibers with a diameter of about 300nm, and is precisely anchored to the nodes of HDPE fibers through electrostatic orientation, with a coverage of 78%.

[0050] Examples 2-3 and Comparative Examples 1-2 Examples 2-3 and Comparative Examples 1-2 respectively provide a continuous production method for flash nonwoven fabric based on nanofiber reinforcement. The difference from Example 1 is that the addition ratio of HDPE and PA6 is different, as shown in Table 1. Other steps are roughly the same as in Example 1, and will not be repeated here.

[0051] Table 1. Mass ratio of HDPE to PA6 in Examples 2-3 and Comparative Examples 1-2 Examples 4-5 and Comparative Examples 3-4 This comparative example provides a continuous production method for flash nonwoven fabric based on nanofiber reinforcement. The difference from Example 1 is that the voltage in step (2) is different, as shown in Table 2. The other steps are roughly the same as in Example 1, and will not be repeated here.

[0052] Table 2. Voltages in Examples 4-5 and Comparative Examples 3-4 Comparative Examples 5-6 This comparative example provides a continuous production method for flash nonwoven fabric based on nanofiber reinforcement. The difference from Example 1 is that in step (1), PA6 was not added in Comparative Example 5, and PA6 was replaced with PET nanofiber in Comparative Example 6. The other steps are roughly the same as in Example 1, and will not be repeated here.

[0053] Comparative Example 7 This comparative example provides a continuous production method for flash nonwoven fabric based on nanofiber reinforcement. The difference from Example 1 is that in step (2), no voltage is applied during the web forming stage, and a PA6 nanofiber layer with a diameter of about 300 nm is subsequently used as the outer coating. The other steps are roughly the same as in Example 1, and will not be repeated here.

[0054] The mechanical properties, air permeability and surface morphology of the nonwoven fabrics prepared in Examples 1-5 and Comparative Examples 1-7 were analyzed, and the results are shown in Table 3.

[0055] Table 3 Mechanical properties, air permeability, and surface morphology of the nonwoven fabrics prepared in Examples 1-5 and Comparative Examples 1-7 As can be seen from the results of Examples 1-3 and Comparative Examples 1-4 in Table 3, when the ratio of HDPE to PA6 is controlled at 4-8 wt% and the voltage during the web-forming stage is 20-30 kV, the nanoscale dispersion of PA6 can be guaranteed. This avoids severe pore blockage of the fiber web and ensures that most of the PA6 nanofiber reinforcing phase is distributed at the cross nodes of the fiber web, thus ensuring that the strength and air permeability of the nonwoven fabric are at an appropriate balance. When the ratio of HDPE to PA6 is too small, although the porosity increases, there is less PA6 nanofiber reinforcing phase distributed at the cross nodes of the fiber web, resulting in a decrease in strength. When the ratio of HDPE to PA6 is too large, although the strength of the nonwoven fabric is enhanced, the excess PA6 nanofibers will block the pores of the fiber web, seriously affecting air permeability. When the voltage during the web-forming stage is too small or too large, it will affect the distribution of the PA6 nanofiber reinforcing phase. Too large a voltage will easily cause accumulation, while too small a voltage will cause accumulation. It can easily cause blockage of fiber mesh pores; as can be seen from the results of Example 1 and Comparative Example 5, the nonwoven fabric prepared in Example 1 has a 60% increase in strength and a 3.6-fold increase in air permeability compared to pure HDPE nonwoven fabric, successfully overcoming the contradiction between strength and air permeability in traditional technology; as can be seen from the results of Example 1 and Comparative Example 6, replacing PA6 with PET nanofibers reduces strength by 22% and air permeability by 20%, proving that PA6 is an irreplaceable nano-reinforcing phase in this system, and the weak interaction between the amide groups of PA6 and non-polar HDPE is the key to achieving "in-situ phase separation-nano-anchoring"; as can be seen from the results of Example 1 and Comparative Example 7, the nonwoven fabric prepared in Example 1 has far superior strength and air permeability compared to traditional lamination processes, indicating that the in-situ reinforcement treatment in this scheme not only solves the problem of the inability to balance the strength and air permeability of nonwoven fabrics, but also achieves a simultaneous improvement in strength and air permeability.

[0056] In summary, this application provides a flash nonwoven fabric reinforced with nanofibers and its continuous production method. Through an integrated process of "material composition design - flash fiber formation - in-situ reinforcement - continuous shaping", the precise distribution of PA6 nanofibers as the nano-reinforcing phase in the HDPE fiber network is achieved while retaining the high porosity characteristics of the flash nonwoven fabric. By controlling the blending ratio of PA6 and HDPE substrate and the electrostatic orientation reinforcement parameters, the nano-reinforcing phase is precisely anchored at the nodes of the HDPE fiber web, avoiding clogging of the fiber web pores. This allows for directional control of the balance between material strength and air permeability. Further calendering and setting achieves "nano-reinforcement-pore retention." This continuous production method simultaneously achieves ultrafine substrate fiber processing, nanofiber reinforcement, and pore retention in a single process. Compared to traditional multi-step composite processes, it increases production efficiency by 30% and reduces energy consumption by 20%, providing a scalable technical path for the industrial continuous production of high-performance flash nonwoven fabrics. The nanofiber-reinforced flash nonwoven fabric obtained by this invention has a longitudinal tensile strength of 41.3~50.1 MPa, and an air permeability of 90~102 L / (m²·s), meeting the conflicting indicators of impermeability and air permeability of medical protective materials in EN14683 standard, providing an industrial mass production solution for reusable protective clothing.

[0057] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A continuous production method for flash-evaporated nonwoven fabrics reinforced with nanofibers, characterized in that, Includes the following steps: S1. Preparation of substrate blending and spinning solution: HDPE and PA6 are added to a solvent and stirred to obtain a spinning solution; S2. Flash spinning and fiber forming: The spinning solution is spun to obtain a "PE main fiber-PA6 nanofiber" composite fiber web; S3. Hot roll calendering and setting: The composite fiber web is calendered and set to obtain nano-reinforced nonwoven fabric.

2. The continuous production method of flash-evaporated nonwoven fabric based on nanofiber reinforcement according to claim 1, characterized in that, In step S1, the mass ratio of HDPE to PA6 is 4~8wt%.

3. The continuous production method of flash-evaporated nonwoven fabric based on nanofiber reinforcement according to claim 1, characterized in that, In step S2, the fiber-forming process in the spinning process is as follows: the spinning solution is sprayed through a slit nozzle with a slit width of 0.15 mm under a high-speed airflow of 1~2 MPa at 75°C to form ultrafine fibers.

4. The continuous production method of flash-evaporated nonwoven fabric based on nanofiber reinforcement according to claim 3, characterized in that, In the spinning process, the web formation process is as follows: a voltage of 20~30kV is applied between two parallel electrode plates with a spacing of 10cm, and the ultrafine fibers pass between the two parallel electrode plates to form a composite fiber web.

5. The continuous production method of flash-evaporated nonwoven fabric based on nanofiber reinforcement according to claim 1, characterized in that, In step S3, the calendering and shaping instrument is a two-roll hot press, the roller temperature of the two-roll hot press is 88~92℃, the pressure of the two-roll hot press is 0.3MPa, and the linear speed of the two-roll hot press is 5~8m / min.

6. The continuous production method of flash-evaporated nonwoven fabric based on nanofiber reinforcement according to claim 1, characterized in that, In step S1, the stirring temperature is 58~62℃, the stirring rate is 450~550r / min, and the stirring time is 28~32min.

7. The continuous production method of flash-evaporated nonwoven fabric based on nanofiber reinforcement according to claim 1, characterized in that, In step S1, the concentration of the spinning solution is 7-9 wt%.

8. The flash nonwoven fabric based on nanofiber reinforcement and its continuous production method according to claim 1, characterized in that, In step S1, the solvent is xylene solvent, and the purity of the solvent is ≥99.5%.

9. A flash-evaporated nonwoven fabric reinforced with nanofibers, characterized in that, The flash nonwoven fabric based on nanofiber reinforcement and its continuous production method as described in any one of claims 1 to 8 is obtained.

10. The flash nonwoven fabric based on nanofiber reinforcement according to claim 9, characterized in that, The longitudinal tensile strength of the nanofiber-reinforced flash nonwoven fabric is 41.3~50.1 MPa, and the air permeability of the nanofiber-reinforced flash nonwoven fabric is 90~102 L / (m²·s).

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