CN219896234U

CN219896234U - Protective isolation bed system

Info

Publication number: CN219896234U
Application number: CN202320150596.8U
Authority: CN
Inventors: 管晓宁; 胡必杰; 高晓东; 林婧; 王璐; 金文婷; 邹婷; 潘珏
Original assignee: Zhongshan Hospital Fudan University; Donghua University
Current assignee: Zhongshan Hospital Fudan University; Donghua University
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-10-27
Anticipated expiration: 2033-01-17

Abstract

The application discloses a protective isolation bed system, which comprises a bedspread main body, an automatic filtering air supply device, an air inlet pipe, an exhaust pipe and an air pressure detection control device, wherein the bedspread main body is provided with a plurality of air inlet pipes; the automatic filtering air supply device is arranged outside the bedspread main body and is communicated with the inner space through an air inlet pipe; the inner space is communicated with the outer space through an exhaust pipe, and an electromagnetic air outlet valve is arranged on the exhaust pipe; the air pressure detection control device is in communication connection with the automatic filtering air supply device; the air pressure of the internal space of the bedspread main body is set to be larger than the atmospheric pressure; the bedspread main body is an elastic metal framework folding tent with a protective layer fabric. The protective isolation bed system provided by the application can be quickly put into use, is convenient to construct and can provide effective protective isolation.

Description

Protective isolation bed system

Technical Field

The application relates to a protective isolation bed system, and belongs to the technical field of medical infection isolation.

Background

The probability of occurrence of nosocomial infection of patients with low immunity such as respiratory diseases, blood immunodeficiency diseases, malignant tumors and the like during hospitalization is extremely high, the nosocomial infection part is positioned at the first place by respiratory tract, once the patients are infected, serious threat to life health is generated along with the progress of illness, in the present stage, the infection rate is controlled, a sterile ward and a movable laminar flow bed isolate the patients from the external environment, and a clean environment is created as the most effective means, but the sterile ward is used as a clean room with the highest requirements on the cleaning technology in the hospital, the construction requirement and the manufacturing cost are expensive, and the clean room is difficult to be realized in many common hospitals; the movable laminar flow bed can realize local air purification, provides a movable clean space for patients, has higher utilization rate in departments such as blood, radiotherapy and the like, but has high cost, large occupied space and frequent mobile use of the patients, and also has hidden danger of cross infection, and can not realize in-hospital coverage due to equipment price.

Therefore, a protective device capable of rapidly and simply providing a closed space and efficiently protecting a patient from protective isolation of tiny harmful aerosol and tiny dust in the air is sought, meanwhile, germs stained on the surface of the device can be actively eliminated, the infection of the patient is reduced, and meanwhile, the hospitalization cost of the patient is reduced, so that the patient benefits, and the protective device is very important.

Disclosure of Invention

The utility model aims to solve the technical problems of high cost, large occupied space, inconvenient construction and difficult realization of in-hospital coverage of the existing sterile ward and movable laminar flow.

In order to solve the technical problems, the technical scheme of the utility model is to provide a protective isolation bed system which comprises a bed cover main body, an automatic filtering air supply device, an air inlet pipe, an exhaust pipe and an air pressure detection control device; the automatic filtering air supply device is arranged outside the bedspread main body and is communicated with the inner space of the bedspread main body through an air inlet pipe; the inner space of the bedspread main body is communicated with the outer space of the bedspread main body through an exhaust pipe, an electromagnetic air outlet valve is arranged on the exhaust pipe, and the electromagnetic air outlet valve is in control connection with the air pressure detection control device; the air pressure detection control device is in communication connection with the automatic filtering air supply device; the air pressure of the inner space of the bedspread main body is set to be larger than the atmospheric pressure; the bedspread main body is an elastic metal framework folding tent with a protective layer fabric. The protective layer fabric is a composite fabric which sequentially comprises a spun-bonded non-woven micro-fiber layer, a melt-blown non-woven micro-fiber layer, an antibacterial and antiviral electrostatic spinning micro-nano-fiber layer and a comfortable spunlaced micro-non-woven layer from inside to outside, and has the effects of filtering, resisting bacteria and resisting viruses.

Preferably, the pressure of the internal space of the bedspread main body is set to be 5-10 Pa greater than the atmospheric pressure.

Preferably, the bedspread body comprises an outer protective layer and a bottom protective layer at the bottom, and the outer protective layer and the bottom protective layer are integrated. Further, the bedspread main body comprises an elastic framework serving as a supporting structure, and the elastic framework and the external protective layer are formed by stitching; both sides of the external protective layer are provided with a waterproof sealing zipper and a transparent operation observation window.

Preferably, the air pressure detection control device comprises a pressure sensor, a wireless transmitter, a wireless receiver and a first air pressure controller; the pressure sensor is in communication connection with the wireless transmitter, the wireless receiver is in communication connection with the first air pressure controller, and the first air pressure controller is in control connection with the electromagnetic air outlet valve; the automatic filtering air supply device comprises a second air pressure controller, a filter and an air supply device; the first air pressure controller is in communication connection with the second air pressure controller.

The application also provides a preparation method of the protective layer fabric, which comprises the following steps:

step one, preparing a spun-bonded non-woven microfiber layer; adopting a spunbonding spinning net forming device, melting polypropylene slices at high temperature by a screw extruder, filtering and metering after melting, extruding from a spinneret orifice, cooling and negatively drafting extruded filament bundles by airflow, uniformly lapping, and winding a fiber net after hot rolling to obtain a spunbonding non-woven micro fiber layer;

Step two, preparing a melt-blown non-woven microfiber layer; adopting a melt-blown spinning net forming device, melting polypropylene slices at high temperature through a screw extruder, metering the polypropylene slices to a spinning assembly through a metering pump, extruding the polypropylene slices from a die head spinning hole, forming superfine fibers under the action of high-speed hot air flow, and forming a melt-blown non-woven micrometer fiber layer on a collecting device;

step three, preparing an antibacterial and antiviral electrostatic spinning micro-nano fiber layer; adding polyacrylonitrile powder into N, N-dimethylformamide by adopting an electrostatic spinning device to dissolve to obtain a solution, adding a high-molecular biguanide antibacterial and antiviral finishing solution into the solution to obtain a mixed spinning solution, carrying out electrostatic spinning under a high-voltage electric field, and depositing on a receiving device to form an electrostatic spinning micro-nanofiber layer through high-speed stretching of electric field force, solvent volatilization and solidification;

preparing a comfortable spunlaced non-woven microfiber layer; adopting a hydroentangled device to open, remove impurities and comb viscose fibers to obtain a flat and uniform fiber web, prewetting the combed fiber web before hydroentangled to compact the fiber web, feeding the wetted fibers into a hydroentangled machine, and mutually intertwining and cohesion the fibers in the fiber web under the action of high-pressure water jet to reinforce the fiber web to form a hydroentangled non-woven micro fiber layer;

And fifthly, carrying out multi-layer offline compounding on the spunbonded non-woven micro-fiber layer, the melt-blown non-woven micro-fiber layer, the antibacterial and antiviral electrostatic spinning micro-nano-fiber layer and the comfortable spunlaced non-woven micro-fiber layer to obtain the protective layer fabric.

Preferably, in the first step, the first zone temperature of the extruder is 210 ℃, the second zone temperature is 210 ℃, the third zone temperature is 230 ℃, the fourth zone temperature is 230 ℃, the fifth zone temperature is 230 ℃, the sixth zone temperature is 230 ℃, and the seventh zone temperature is 225 ℃; the temperature of the spinning box body is 230 ℃; the melt pressure is 8MPa, and the rotation speed of a metering pump is 20-25r/min; the cooling wind pressure is 800Pa, the cooling wind speed is 2m/s, the cooling wind temperature is 20 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net forming speed is 28.7m/min.

Preferably, in the second step, the temperature of the first area of the extruder is 200 ℃, the temperature of the second area is 210 ℃, the temperature of the third area is 220 ℃, the temperature of the fourth area is 220 ℃, the temperature of the fifth area is 220 ℃, the temperature of the first area of the die head is 210 ℃, the temperature of the second area of the die head is 220 ℃, the speed of the metering pump is 22-25r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the die head is 21-25cm.

Preferably, in the third step, the mass fraction of the polyacrylonitrile in the mixed spinning solution is 8-10wt%, the mass fraction of the polymeric biguanide antibacterial antiviral agent in the polyacrylonitrile is 1-5wt%, the electrostatic spinning voltage is 15kV, and the receiving distance is 15-20cm.

Preferably, in the fourth step, the diameter of the viscose fiber is 9.7-11.9 μm, the pre-hydroentangling pressure is 15-20bar, the primary hydroentangling pressure is 45-50bar, the primary hydroentangling pressure is 60-65bar, the primary hydroentangling pressure is 80-85bar, the primary hydroentangling pressure is 65-70bar, the hydroentangling distance is 10-20cm, and the net conveying speed is 4-6m/min.

thirdly, carrying out on-line or off-line compounding on the spunbonded non-woven micro-fiber layer and the melt-blown non-woven micro-fiber layer to obtain a compound I;

Step four, adding polyacrylonitrile powder into N, N-dimethylformamide by adopting an electrostatic spinning device to dissolve to obtain a solution, then adding silver ion antibacterial antiviral agent into the solution to obtain a mixed spinning solution, then carrying out electrostatic spinning under a high-voltage electric field, and depositing an electrostatic spinning micro-nanofiber layer, namely an antibacterial antiviral electrostatic spinning micro-nanofiber layer, on one side of a melt-blown non-woven micro-nanofiber layer of the compound I through high-speed stretching of electric field force, solvent volatilization and solidification to obtain the compound II;

step five, preparing a comfortable spunlaced non-woven micron fiber layer; opening cotton fibers, removing impurities and carding to obtain a flat and uniform fiber web by adopting a hydroentangled web forming device, prewetting the carded fiber web before hydroentangled to compact the fiber web, feeding the wetted fibers into a hydroentangled machine, mutually intertwining and cohesion the fibers in the fiber web under the action of high-pressure water jet, and reinforcing the fiber web to form a hydroentangled non-woven micro fiber layer;

step six, carrying out multi-layer offline compounding on the compound II and the comfortable spunlaced non-woven micron fiber layer to obtain a protective layer fabric; wherein, the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is attached to the comfortable spunlaced non-woven micro-fiber layer.

The application also provides a preparation method of the filter element, which is formed by compounding three layers of non-woven materials and comprises the following steps:

And fourthly, carrying out multi-layer offline compounding on the spunbonded non-woven micro-fiber layer, the melt-blown non-woven micro-fiber layer and the antibacterial and antiviral electrostatic spinning micro-nano-fiber layer to obtain the filter element.

The application also provides a preparation method of the filter element, which is characterized by being formed by compounding three layers of non-woven materials, and comprising the following steps: step one, preparing a spun-bonded non-woven microfiber layer; adopting a spunbonding spinning net forming device, melting polypropylene slices at high temperature by a screw extruder, filtering and metering after melting, extruding from a spinneret orifice, cooling and negatively drafting extruded filament bundles by airflow, uniformly lapping, and winding a fiber net after hot rolling to obtain a spunbonding non-woven micro fiber layer;

And fourthly, adding polyacrylonitrile powder into N, N-dimethylformamide by adopting an electrostatic spinning device to dissolve to obtain a solution, adding silver ion antibacterial antiviral agent into the solution to obtain a mixed spinning solution, carrying out electrostatic spinning under a high-voltage electric field, and depositing an electrostatic spinning micro-nanofiber layer, namely an antibacterial antiviral electrostatic spinning micro-nanofiber layer, on one side of the melt-blown non-woven micro-nanofiber layer of the compound I through high-speed stretching of electric field force, solvent volatilization and solidification to obtain the filter element.

The protective isolation bed system provided by the application has the advantages that the protective isolation bed system can be opened like a foldable tent, can be put into use quickly, is convenient to construct and can provide effective protective isolation; the protective layer fabric has the effects of effective filtration, antibiosis and antivirus, and can provide effective protection for the protective isolation bed system.

Drawings

FIG. 1 is a flow chart of the operation of a guard isolation bed system of the present application;

FIG. 2 is a schematic diagram of a guard isolation bed system according to the present application;

FIG. 3 is a schematic illustration of the outer and bottom protective layers of the bed cover body of the protective insulated bed system of the present application;

reference numerals: the anti-bacterial and anti-virus electrostatic spinning micro-nano fiber layer comprises a main body protective layer fabric, an outer protective layer, a bottom protective layer, an automatic filtering air supply device, an air supply pipe, a filter, an air pressure detection control device, an exhaust pipe, a bedspread main body protective layer fabric, a spun-bonded non-woven micro-fiber layer, a melt-blown non-woven micro-fiber layer, an anti-bacterial and anti-virus electrostatic spinning micro-nano fiber layer and a comfortable spun-laced micro-non-woven layer.

Detailed Description

In order to make the application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

The application provides a protective isolation bed system, referring to fig. 1 and 2, comprising a bed cover main body, an automatic filtering air supply device 200, an air inlet pipe 201, an exhaust pipe 400 and an air pressure detection control device 300; the bedspread body comprises an elastic framework serving as a supporting structure;

the bedspread body is a soft bedspread made of protective layer fabrics, the elastic framework is a metal framework, the elastic framework supports the bedspread body, the bedspread body used in the embodiment can be obtained by conceiving a folding tent with the existing elastic metal framework and replacing the fabrics of the folding tent with the protective layer fabrics;

the automatic filtering air supply device 200 (fan RadiCal, irinotecan) is positioned outside the bedspread main body and is communicated with the inner space of the bedspread main body through the air inlet pipe 201, and the inner space of the bedspread main body is communicated with the outer space of the bedspread main body through the air outlet pipe 400;

an electromagnetic air outlet valve is arranged on the exhaust pipe 400; the electromagnetic air outlet valve is connected with the air pressure detection control device 300, and is opened when the air pressure of the inner space of the bedspread main body is higher than the set pressure; under other conditions, the electromagnetic air outlet valve is closed;

The air pressure detection control device 300 (PTJ 501, TRH-Z-380-1-FR-P, gao Minghao) is located in the bedspread main body, and is used for monitoring and displaying the air pressure of the internal space of the bedspread main body in real time, and adjusting the air supply speed of the automatic filtering air supply device 200 so that the air pressure of the internal space of the bedspread main body is maintained within the set pressure when the monitored air pressure is lower than the set pressure; the air pressure detection control device 300 comprises a pressure sensor, a wireless transmitter, a wireless receiver and a first air pressure controller; the automatic filtering air supply 200 includes a second air pressure controller, a filter 202, and an air supply (e.g., a blower, etc.); when the pressure sensor of the air pressure detection control device 300 works, the air pressure sensor directly measures the air pressure in the bedspread main body, the air pressure signal is sent to the wireless receiver by the wireless transmitter, the first air pressure controller judges whether the air pressure is lower than the set pressure after acquiring the air pressure signal by the wireless receiver, and sends a signal to the second air pressure controller in the automatic filtering air supply device 200 when the air pressure is lower than the set pressure, and the second air pressure controller increases the air supply speed of the air supply device and improves the pressure in the bedspread main body;

the pressure set in the air pressure detection control device 300 is higher than the atmospheric pressure so that the inside of the bed cover body is maintained at a high pressure.

The pressure in the bedspread body is larger than the atmospheric pressure, so that the inhalation and contamination of external biological aerosol can be effectively prevented, the penetration of microorganism liquid into the inner space of the bedspread can be prevented, and the controllable flow of air flow can be realized.

The protective isolation bed system provided by the application can be used as a folding tent, so that the bed cover body can be conveniently unfolded on the bed, and then the automatic filtering air supply device 200, the air inlet pipe 201, the exhaust pipe 400 and the air pressure detection control device 300 are connected in place, so that the protective isolation bed system can be put into use, is convenient to construct and can provide effective protective isolation.

The protective isolation bed system is set to be 5-10 Pa higher than atmospheric pressure, the pressure difference is used for maintaining micro positive pressure, external air cannot enter the internal space of the bed cover main body, if the positive pressure is too low, such as 2.5Pa, the protective isolation bed system can also function, but a certain error exists in machine detection, if the pressure is too high, the energy consumption is increased, noise is increased, and the like are not needed; in addition, when the set pressure is 5-10 Pa higher than the atmospheric pressure, the human body can hardly perceive the pressure difference, and the discomfort to the patient body can not be caused.

A guard isolation bed system as described above, when the gas permeation area at a flow rate of 85L/min is 12cm ² When the bedspread main body is used, the ventilation resistance is higher than 1200Pa, so that the purpose is to ensure the high tightness of the bedspread main body protective fabric, otherwise, the airtightness is poor, and the positive pressure is difficult to form or the positive pressure energy consumption is high.

The protective isolation bed system has the advantages that the permeable air flow of the bed cover main body is 5-7L/min under the pressure difference of 100Pa, so that the bed cover main body has slight air permeability and is not completely airtight, and the safety can be ensured even if the ventilation part and the like have problems.

The protective isolation bed system has the advantages that the minimum ventilation times of the bed cover main body are 18-24 times/h, the minimum ventilation times are set by referring to the national standard of a clean operating room, the aim is to meet the requirement of air cleanliness, and the minimum ventilation quantity is obtained by the volume of the internal space of the bed cover main body.

A protective insulated bed system as described above, the bed cover body comprising a peripheral outer protective layer 101 and a bottom protective layer 102 at the bottom, the outer protective layer 101 and the bottom protective layer 102 being integral.

According to the protective isolation bed system, the outer protective layer 101 and the bottom protective layer 102 are formed by compounding more than two layers of non-woven materials, the tensile breaking strength is 250-300N, the filtering efficiency of non-oily aerodynamic mass particles with the median diameter of 0.24 mu m is better than 99%, the antibacterial efficiency (mainly comprising escherichia coli and staphylococcus aureus) is better than 99.9%, and the antiviral efficiency (mainly comprising influenza virus and coronavirus) is better than 99.9%.

A protective barrier bed system as described above, referring to fig. 3, the outer protective layer 101 and the bottom protective layer 102 are formed by combining four layers of nonwoven materials, when the gas permeation area at a flow rate of 85L/min is 12cm ² When the bedspread main body is used, the ventilation resistance is higher than 1200Pa; the outer protective layer 101 and the bottom protective layer 102 which are formed by compounding four layers of non-woven materials are sequentially a spun-bonded non-woven micro-fiber layer 501, a melt-blown non-woven micro-fiber layer 502, an antibacterial and antiviral electrostatic spinning micro-nano-fiber layer 503 and a comfortable spunlaced micro-non-woven layer 504 from outside to inside (the inner layer is contacted with the gas in the inner space of the bedspread main body);

the fiber diameter of the spun-bonded non-woven microfiber layer 501 is 18.0-21.0 μm, the thickness is 0.35-0.39 mm, and the unit area mass is 40-50 g/m ² The tensile breaking strength is 130-150N, and the permeable air flow rate under 100Pa pressure difference is 109-113L/min; the preparation method of the spun-bonded non-woven microfiber layer is not particularly limited, the raw materials are high-molecular materials such as polypropylene, polyethylene or polyester, and the master batch is extruded after being melted at high temperature by a screw extruder, and is drawn into filaments by cold air, and the filaments after drawing are directly laid into a net to form the spun-bonded non-woven microfiber layer; the spun-bonded outer layer has high strength, can play a supporting role, has certain filtering efficiency, and can effectively intercept large-particle-size Particulate Matters (PM) ₁₀ )；

The melt-blown nonwoven microfiber layer 502 has a fiber diameter of 5.0 to 10.0 μm, a thickness of 0.30 to 0.38mm, and a mass per unit area of 40 ultra-large50g/m ² The tensile breaking strength is 25-35N, and the permeable air flow rate under 100Pa pressure difference is 11-15L/min; the preparation method of the melt-blown non-woven microfiber layer is not particularly limited, the raw materials are high polymer materials such as polypropylene, and master batch is extruded from a die head spinneret orifice after being melted to form polymer melt trickle, and superfine fibers are formed under the drafting of high-temperature and high-speed air flow and deposited on a receiving device screen to form the melt-blown non-woven microfiber layer; the melt-blown nonwoven layer has large specific surface area and high porosity, and can effectively intercept fine Particulate Matters (PM) _2.5 )；

The fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer 503 is 0.3-1.0 mu m, the thickness is 0.08-0.17 mm, and the mass per unit area is 10-24 g/m ² The tensile breaking strength is 10-20N, and the permeable air flow rate under 100Pa pressure difference is 9-25L/min; the preparation method of the antibacterial and antiviral electrostatic spinning micro-nanofiber layer is not particularly limited; the raw materials are high polymer materials such as polyacrylonitrile, biological bases such as chitosan or inorganic components such as metallic silver or organic components such as guanidine antibacterial and antiviral agents are added, and electrostatic spinning micro-nano fiber layers are formed by high-speed stretching under the action of electric field force, solvent volatilization and solidification and deposition on a receiving device; the electrostatic spinning fiber layer fiber nano-size effect can effectively block bacteria, microorganisms and the like (PM) _0.3 ) Meanwhile, the antibacterial and antiviral fiber active ingredients of the fiber can destroy the activities of bacteria, microorganisms and the like, and the functional layer is arranged in the middle layer, so that the antibacterial and antiviral ingredients are ensured not to contact the skin and excellent antibacterial and antiviral properties are provided;

the comfortable spunlaced micro-fiber layer 504 is a spunlaced non-woven layer which takes hydrophilic fiber materials such as viscose, cotton and the like as raw materials, the fiber diameter of the comfortable spunlaced non-woven layer is 9.7-13.4 mu m, the thickness is 0.35-0.40 mm, and the unit area mass is 45-50 g/m ² The tensile breaking strength is 45-55N, and the permeable air flow rate under 100Pa pressure difference is 300-380L/min; the preparation method of the comfortable spunlaced nonwoven layer is not particularly limited, the raw materials are hydrophilic fiber materials such as viscose, cotton and the like, the fiber web after being tidied and wetted adopts high-pressure multi-strand fine water jet to enable the fibers in the fiber web to displace, intertwine and cohesion, and the method comprises the following steps ofA web secured forming a comfortable hydroentangled nonwoven layer; the hydrophilic fiber has good hygroscopicity, the inner layer has skin-friendly property and soft hand feeling, and when a human body is laid on the bottom protective inner layer, the sweat-absorbing heat-moisture comfort is good;

the preparation method of the outer protective layer 101 and the bottom protective layer 102 is as follows: the spunbond nonwoven microfiber layer 501, the meltblown nonwoven microfiber layer 502, the antimicrobial antiviral electrospun microfiber layer 503, and the comfort hydroentangled nonwoven microfiber layer 504 are multi-layered offline compounded, or a spunbond meltblown composite layer (i.e., a composite layer of spunbond nonwoven microfiber layer and meltblown nonwoven microfiber layer) is used as a base fabric, and the electrospun microfiber layer is collected and then compounded with the hydroentangled nonwoven microfiber layer.

The protective isolation bed system of the application has a multilayer antibacterial and antiviral structure and a positive pressure structure, on one hand, the multilayer structure can filter and purify surface air and germs, so that the air entering and exiting is clean, and on the other hand, the positive pressure environment can further prevent dust germs in an external space from entering an isolation area, so that the two are cooperated and assisted, and the aim can be better realized under the conditions of controlling the cost and ensuring the safety.

In the prior art, the traditional spunbonded-melt-blown-spunbonded composite non-woven materials, activated carbon composite non-woven materials, film-coated materials and the like exist, the traditional spunbonded-melt-blown-spunbonded composite non-woven materials have the defects that the filtering effect of solid particles is not ideal (about 60 percent), and the performance can not meet the requirements in the disease areas with high infectious risks; in order to further improve the filtering effect, the active carbon fiber non-woven fabric has a porous structure and a large internal specific surface area, and has higher adsorption capacity, but the active carbon is easy to attenuate and difficult to last; the film-covered material with wider application is generally formed by compounding a spunbonded microporous breathable film, has very good germ blocking property and filtering efficiency, but has poor comfort and strength, and can only adsorb germs and can not inactivate the germs. The prior art is difficult to adjust according to the actual use scene and the demand of the protective isolation bedspread, is difficult to realize the requirements of filtration, purification, pathogen resistance and comfort of the protective isolation material, and is difficult to mutually cooperate with 'positive pressure design' (because the positive pressure design also has certain requirements on the air permeability of the material, the air permeability of the material in the prior art is difficult to meet the requirements).

The prepared protective layer is designed and prepared according to actual application scenes and requirements, and consists of a spunbonded non-woven micrometer fiber layer 501, a melt-blown non-woven micrometer fiber layer 502, an antibacterial and antiviral electrostatic spinning micro-nanofiber layer 503 and a comfortable spunlaced micrometer non-woven layer 504, and the prepared composite protective material has the advantages of the traditional material, meanwhile, the first three layers are taken as filtering and purifying functional layers, fibers are distributed from micrometers to nanometers, and filtering and purifying of different levels of each layer can be realized; meanwhile, the innermost comfortable spunlaced micron non-woven layer is used as a contact layer, the fiber is hydrophilic and has excellent hygroscopicity, and the comfort and skin friendliness of a patient lying on the fiber can be realized; meanwhile, the antibacterial and antiviral electrostatic spinning micro-nano fiber layer contains antibacterial and antiviral components, under the premise of realizing micro-nano scale physical filtration and purification of air, the antibacterial and antiviral electrostatic spinning micro-nano fiber layer can further sterilize and disinfect, the high-function layer does not contact skin, and the antibacterial and antiviral effects exist in a fiber mode, so that the risk that antibacterial particles enter a human body after falling off is reduced, and meanwhile, the comfortable spunlaced micro-non-woven layer can further protect the human body. The four layers of protective layers cooperate, the composite strength is high, the purifying effect is good, the comfort is good, the air tightness is good, the practicability is strong, and the composite positive pressure protective isolation material is ideal.

In the protective isolation bed system as described above, the filter 202 in the automatic filtration air supply device 200 comprises a filter housing and a filter core positioned in the filter housing, and the air supply device sucks air from the external space through the filter core and then enters the internal space of the bedspread main body; the filter core is formed by compounding three layers of non-woven materials, and the spun-bonded non-woven microfiber layer, the melt-blown non-woven microfiber layer and the antibacterial and antiviral electrostatic spinning micro-nanofiber layer are sequentially arranged from outside to inside (the inner layer is in contact with the gas in the inner space of the bedspread main body); the filter 202 has a non-oily aerodynamic mass median diameter of 0.24 μm, a filtering efficiency of better than 99%, an antibacterial efficiency (main object is escherichia coli, staphylococcus aureus) of better than 99.9%, and an antiviral efficiency (main object is influenza virus, coronavirus) of better than 99.9%; the preparation method of the filter core of the filter 202 comprises the following steps: the spun-bonded non-woven microfiber layer, the melt-blown non-woven microfiber layer and the antibacterial and antiviral electrostatic spinning micro-nanofiber layer are subjected to multi-layer offline compounding, or the spun-bonded melt-blown composite layer (namely the composite layer of the spun-bonded non-woven microfiber layer and the melt-blown non-woven microfiber layer) is used as a base fabric, and the electrostatic spinning fiber membrane is collected.

The bed cover main body also comprises an elastic framework (such as a memory metal wire, a glass fiber tube and the like) serving as a bed cover supporting structure, the elastic framework and the external protective layer 101 are sewn and formed, the bed cover is foldable and automatically opened, the bed cover is only required to be unfolded when in use, the elastic framework can be automatically supported and fixed, the structure is stable, and the shape can be a mongolian type, a square shape and the like; the left and right sides of outside inoxidizing coating 101 all are equipped with waterproof seal zip fastener and transparent operation observation window, and waterproof seal zip fastener can open and shut, makes things convenient for patient to get on or off the bed, and transparent operation observation window selects the high PVC material that passes through, can realize medical staff to patient conventional observation and operation treatment under the isolation state, and in addition, all splice and seam positions of bedspread main part all adopt medical joint strip to seal up to guarantee the bedspread gas tightness.

The protective isolation bed system is characterized in that the bottom protective layer and the sickbed are fixed in a mode of wrapping a bed cover or sewing elastic bands at four corners of a main body of the bed cover to be directly nested with a mattress or bonded with the mattress by adopting one or more of clips, magic tapes and the like.

The bedspread body is used for constructing an independent protective isolation environment, so that the antibacterial and antiviral components can destroy activities of bacteria, microorganisms and the like while not contacting skin, excellent antibacterial and antiviral performances are provided, surface bacteria and viruses can be intercepted and killed by the multi-layer structure, and a totally-enclosed clean sterile environment can be formed for patients;

According to the application, the automatic filtering air supply device 200 is arranged, the air supply quantity is automatically regulated according to the air pressure displayed by the air pressure detection control device 300 in the bedspread, so that the air pressure in the bedspread main body is ensured to be greater than the atmospheric pressure, the inhalation and contamination of external biological aerosol are effectively prevented, the penetration of microorganism liquid into the inner space of the bedspread is prevented, and the controllable flow of air flow is realized;

the application has the functions similar to a clean ward, is matched with a common sickbed for use, can sterilize the bedspread once or repeatedly, can effectively reduce the infection probability of patients, and reduces the treatment cost.

The test method of the performance index of the protective layer is as follows:

tensile breaking strength: reference GBT 24218.3 _textile nonwoven test method part 3: measuring breaking strength and breaking elongation, wherein the width of a sample is 50mm, the clamping distance is 200mm, and the stretching speed is 100mm/min;

non-oily aerodynamic mass median diameter 0.24 μm particulate matter filtration efficiency: referring to the technical requirements of GB 19083-2010 medical protective mask, the gas flow rate is 85L/min;

antibacterial efficiency against E.coli: evaluation of antibacterial Properties of textiles with reference to GB_T20944.2-2007 part 2_absorption method, sample weight 0.40g;

Antibacterial efficacy against staphylococcus aureus: evaluation of antibacterial Properties of textiles with reference to GB_T20944.2-2007 part 2_absorption method, sample weight 0.40g;

antiviral efficacy against influenza virus: with reference to the measurement of the antiviral activity of ISO 18184:2019 textile, the weight of a sample is 0.4g, the virus influenza H1N1 is tested, and the test time is 24 hours;

antiviral efficacy against coronaviruses: with reference to the measurement of the antiviral activity of ISO 18184:2019 textile, the weight of a sample is 0.4g, and the test time is 24 hours;

the flow rate of permeate gas at 100Pa differential pressure: referring to the measurement of the air permeability of the textile fabric of GB-T5453-1997, the pressure difference of two sides of a sample is 100Pa, and the area of the sample is 20cm < 2 >;

mass per unit area: referring to the measurement of the mass of the 1 st part of the bit area of the GB/24218.1-2009 textile non-woven fabric test method, the area of a sample is 50000mm < 2 >;

when the flow rate is 85L/min and the gas permeation area is 12cm < 2 > -the test method of the ventilation resistance comprises the following steps: 3 samples are randomly extracted, the gas flow is adjusted to be 85L/min, the area of a sample test area is 12cm < 2 >, and the pressure difference of two sides of the sample is tested, so that the ventilation resistance is obtained.

The preparation method of the protective layer fabric provided by the application is specifically referred to the following examples.

Example 1

The preparation method of the protective layer fabric comprises the following specific steps:

(1) Preparing a spunbond nonwoven microfiber layer;

a spunbonded spinning net forming device (Reicofil, reifenhauser, germany) is adopted, a polypropylene slice (HY 425, smooth petrochemical) is melted at high temperature by a screw extruder, after melting, filtering and metering are carried out, the extruded filament bundles are extruded from a spinneret orifice, after being cooled by airflow and negatively drawn, net laying is carried out uniformly, and the fiber net is rolled after hot rolling, thus obtaining a spunbonded non-woven micro fiber layer;

wherein the temperature of the extruder 1 zone is 210 ℃, the temperature of the extruder 2 zone is 210 ℃, the temperature of the extruder 3 zone is 230 ℃, the temperature of the extruder 4 zone is 230 ℃, the temperature of the extruder 5 zone is 230 ℃, the temperature of the extruder 6 zone is 230 ℃, and the temperature of the extruder 7 zone is 225 ℃; the temperature of the spinning box body is 230 ℃; the melt pressure is 8MPa, and the rotation speed of a metering pump is 25r/min; the cooling wind pressure is 800Pa, the cooling wind speed is 2m/s, the cooling wind temperature is 20 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net forming speed is 28.7m/min;

the fiber diameter of the spun-bonded non-woven microfiber layer was 20.6 μm, the thickness was 0.383mm, and the mass per unit area was 49g/m ² The tensile breaking strength is 147.7N, and the permeable air flow rate is 110.5L/min under 100Pa pressure difference;

(2) Preparing a melt-blown nonwoven microfiber layer;

A melt-blown spinning net forming device (FZ, a non-woven complete equipment Co., ltd.) is adopted, polypropylene slices (PP 6945G1, exxon Mobil chemical) are melted at high temperature by a screw extruder, are metered to a spinning assembly by a metering pump, are extruded from a die head spinning hole, form superfine fibers under the action of high-speed hot air flow, and form a melt-blown non-woven microfiber layer on a collecting device;

wherein the temperature of the extruder 1 area is 200 ℃, the temperature of the extruder 2 area is 210 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of the extruder head 1 area is 210 ℃, the temperature of the extruder head 2 area is 220 ℃, the speed of a metering pump is 25r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the extruder head is 25cm;

the melt-blown nonwoven microfiber layer had a fiber diameter of 9.5 μm, a thickness of 0.374mm and a mass per unit area of 50g/m ² The tensile breaking strength is 32.3N, and the permeable air flow rate under 100Pa pressure difference is 11.5L/min;

(3) Preparing an antibacterial and antiviral electrostatic spinning micro-nano fiber layer;

adding polyacrylonitrile powder (P303197, shanghai Ala Biochemical technology Co., ltd.) into N, N-dimethylformamide by using an electrostatic spinning device (NS Lab, greensland Co., ltd.) to dissolve to obtain a solution, adding a high-molecular biguanide antibacterial and antiviral finishing liquid (AM-60, shanghai Chen Co., ltd.) into the solution to obtain a mixed spinning solution, carrying out electrostatic spinning under a high-voltage electric field, and forming an electrostatic spinning micro-nanofiber layer (antibacterial and antiviral electrostatic spinning micro-nanofiber layer) by high-speed stretching under the action of electric field force, volatilizing and solidifying the solvent, and depositing on a receiving device;

Wherein the mass fraction of the polyacrylonitrile in the mixed spinning solution is 10wt%, the mass fraction of the polymeric biguanide antibacterial antiviral agent in the polyacrylonitrile is 5wt%, the electrostatic spinning voltage is 15kV, and the receiving distance is 15cm;

the fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is 0.80 mu m, the thickness is 0.165mm, and the unit area mass is 23g/m ² The tensile breaking strength is 17.9N, and the permeable air flow rate under 100Pa pressure difference is 9.6L/min;

(4) Preparing a comfortable spunlaced nonwoven microfiber layer;

adopting a hydroentangled device (Aquajet Y500-2, shanghai Dongxing technology import and export company) to open viscose fibers, remove impurities and comb to obtain a flat and uniform fiber web, prewetting the combed fiber web before hydroentangled to compact the fiber web, feeding the wetted fiber into a hydroentangled machine, mutually intertwining and cohesion the fiber in the fiber web under the action of high-pressure water jet, and reinforcing the fiber web to form a hydroentangled non-woven micro fiber layer;

the viscose fiber has the diameter of 11.9 mu m, the pre-hydroentangling pressure of 20bar, the main hydroentangling 1 pressure of 50bar, the main hydroentangling 2 pressure of 65bar, the main hydroentangling 3 pressure of 85bar, the main hydroentangling 4 pressure of 70bar, the hydroentangling distance of 10cm and the net conveying speed of 4m/min;

The comfortable spunlaced nonwoven microfiber layer has a thickness of 0.361mm and a mass per unit area of 49g/m ² The tensile breaking strength is 52.5N, and the permeable air flow rate under 100Pa pressure difference is 325.3L/min;

(5) And carrying out multi-layer offline compounding on the spunbonded non-woven micro-fiber layer, the melt-blown non-woven micro-fiber layer, the antibacterial and antiviral electrostatic spinning micro-nano-fiber layer and the comfortable spunlaced non-woven micro-fiber layer to obtain the protective layer fabric.

The tensile breaking strength of the prepared protective layer fabric is 280.4N, the filtering efficiency of non-oily aerodynamic mass particles with the median diameter of 0.24 mu m is 99%, the antibacterial efficiency of the protective layer fabric on escherichia coli is 100%, the antibacterial efficiency of the protective layer fabric on staphylococcus aureus is 100%, the antiviral efficiency of the protective layer fabric on influenza viruses is 99.99%, and the antiviral efficiency of the protective layer fabric on coronaviruses is 99.99%.

Example 2

(1) Preparing a spunbond nonwoven microfiber layer;

Wherein the temperature of the extruder 1 zone is 210 ℃, the temperature of the extruder 2 zone is 210 ℃, the temperature of the extruder 3 zone is 230 ℃, the temperature of the extruder 4 zone is 230 ℃, the temperature of the extruder 5 zone is 230 ℃, the temperature of the extruder 6 zone is 230 ℃, and the temperature of the extruder 7 zone is 225 ℃; the temperature of the spinning box body is 230 ℃; the melt pressure is 8MPa, and the rotation speed of a metering pump is 20r/min; the cooling wind pressure is 800Pa, the cooling wind speed is 2m/s, the cooling wind temperature is 20 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net forming speed is 28.7m/min;

the fiber diameter of the spun-bonded non-woven microfiber layer is19.4 μm, a thickness of 0.361mm, a mass per unit area of 40g/m ² The tensile breaking strength is 132.5N, and the permeable air flow rate is 113.3L/min under 100Pa pressure difference;

(2) Preparing a melt-blown nonwoven microfiber layer;

wherein the temperature of the extruder 1 area is 200 ℃, the temperature of the extruder 2 area is 210 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of the extruder head 1 area is 210 ℃, the temperature of the extruder head 2 area is 220 ℃, the speed of a metering pump is 22r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the extruder head is 25cm;

The melt-blown nonwoven microfiber layer had a fiber diameter of 7.2 μm, a thickness of 0.326mm and a mass per unit area of 41g/m ² The tensile breaking strength is 26.5N, and the permeable air flow rate is 14.6L/min under 100Pa pressure difference;

wherein the mass fraction of the polyacrylonitrile in the mixed spinning solution is 10wt%, the mass fraction of the polymeric biguanide antibacterial antiviral agent in the polyacrylonitrile is 1wt%, the electrostatic spinning voltage is 15kV, and the receiving distance is 15cm;

the fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is 0.66 mu m, the thickness is 0.158mm, and the unit area mass is 22g/m ² The tensile breaking strength is 19.1N, and the permeable air flow rate is 10.5L/min under 100Pa pressure difference;

(4) Preparing a comfortable spunlaced nonwoven microfiber layer;

wherein the diameter of the viscose fiber is 9.7 mu m, the pre-hydroentangling pressure is 20bar, the main hydroentangling 1 pressure is 50bar, the main hydroentangling 2 pressure is 65bar, the main hydroentangling 3 pressure is 85bar, the main hydroentangling 4 pressure is 70bar, the hydroentangling distance is 10cm, and the net conveying speed is 4m/min;

the thickness of the comfortable spunlaced nonwoven microfiber layer is 0.354mm, and the mass per unit area is 50g/m ² The tensile breaking strength is 55.0N, and the permeable air flow rate is 302.6L/min under 100Pa pressure difference;

The tensile breaking strength of the prepared protective layer fabric is 267.5N, the filtering efficiency of non-oily aerodynamic mass particles with the median diameter of 0.24 mu m is 99%, the antibacterial efficiency of the protective layer fabric on escherichia coli is 99.9999%, the antibacterial efficiency of the protective layer fabric on staphylococcus aureus is 99.9999%, the antiviral efficiency of the protective layer fabric on influenza virus is 99.9%, and the antiviral efficiency of the protective layer fabric on coronavirus is 99.9%.

Example 3

(1) Preparing a spunbond nonwoven microfiber layer;

wherein the temperature of the extruder 1 zone is 210 ℃, the temperature of the extruder 2 zone is 210 ℃, the temperature of the extruder 3 zone is 230 ℃, the temperature of the extruder 4 zone is 230 ℃, the temperature of the extruder 5 zone is 230 ℃, the temperature of the extruder 6 zone is 230 ℃, and the temperature of the extruder 7 zone is 225 ℃; the temperature of the spinning box body is 230 ℃; the melt pressure is 8MPa, and the rotation speed of a metering pump is 22r/min; the cooling wind pressure is 800Pa, the cooling wind speed is 2m/s, the cooling wind temperature is 20 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net forming speed is 28.7m/min;

The fiber diameter of the spun-bonded non-woven microfiber layer was 19.9 μm, the thickness was 0.371mm, and the mass per unit area was 45g/m ² The tensile breaking strength is 140.2N, and the permeable air flow rate is 112.6L/min under 100Pa pressure difference;

(2) Preparing a melt-blown nonwoven microfiber layer;

wherein the temperature of the extruder 1 area is 200 ℃, the temperature of the extruder 2 area is 210 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of the extruder head 1 area is 210 ℃, the temperature of the extruder head 2 area is 220 ℃, the speed of a metering pump is 22r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the extruder head is 21cm;

the melt-blown nonwoven microfiber layer had a fiber diameter of 6.5 μm, a thickness of 0.308mm and a mass per unit area of 40g/m ² The tensile breaking strength is 26.1N, and the permeable air flow rate is 15.0L/min under 100Pa pressure difference;

wherein the mass fraction of polyacrylonitrile in the mixed spinning solution is 8wt%, the mass fraction of the polymeric biguanide antibacterial antiviral agent in the polyacrylonitrile is 1wt%, the electrostatic spinning voltage is 15kV, and the receiving distance is 15cm;

the fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is 0.52 mu m, the thickness is 0.102mm, and the unit area mass is 15g/m ² The tensile breaking strength is 10.2N, and the permeable air flow rate under 100Pa pressure difference is 21.3L/min;

(4) Preparing a comfortable spunlaced nonwoven microfiber layer;

the viscose fiber diameter is 11.9 mu m, the pre-hydroentangling pressure is 15bar, the main hydroentangling 1 pressure is 45bar, the main hydroentangling 2 pressure is 60bar, the main hydroentangling 3 pressure is 80bar, the main hydroentangling 4 pressure is 65bar, the hydroentangling distance is 20cm, and the net conveying speed is 6m/min;

the comfortable spunlaced nonwoven microfiber layer has a thickness of 0.398mm and a mass per unit area of 50g/m ² Tensile breaking strength of 45.3N at 100Pa pressure differenceThe flow rate of the permeable gas is 375.1L/min;

The tensile breaking strength of the prepared protective layer fabric is 258.8N, the filtering efficiency of non-oily aerodynamic mass particles with the median diameter of 0.24 mu m is 99%, the antibacterial efficiency of the protective layer fabric on escherichia coli is 99.9999%, the antibacterial efficiency of the protective layer fabric on staphylococcus aureus is 99.9999%, the antiviral efficiency of the protective layer fabric on influenza virus is 99.9%, and the antiviral efficiency of the protective layer fabric on coronavirus is 99.9%.

Example 4

(1) Preparing a spunbond nonwoven microfiber layer;

wherein the temperature of the extruder 1 zone is 210 ℃, the temperature of the extruder 2 zone is 210 ℃, the temperature of the extruder 3 zone is 230 ℃, the temperature of the extruder 4 zone is 230 ℃, the temperature of the extruder 5 zone is 230 ℃, the temperature of the extruder 6 zone is 230 ℃, and the temperature of the extruder 7 zone is 225 ℃; the temperature of the spinning box body is 230 ℃; the melt pressure is 8MPa, the rotation speed of a metering pump is 24r/min, the cooling wind pressure is 800Pa, the cooling wind speed is 2m/s, the cooling wind temperature is 20 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net forming speed is 28.7m/min;

the fiber diameter of the spun-bonded non-woven microfiber layer is 20.3 mu m, the thickness is 0.377mm, the mass per unit area is 47g/m < 2 >, the tensile breaking strength is 143.3N, and the permeable air flow rate under 100Pa pressure difference is 111.7L/min;

(2) Preparing a melt-blown nonwoven microfiber layer;

wherein the temperature of the extruder 1 area is 200 ℃, the temperature of the extruder 2 area is 210 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of the extruder head 1 area is 210 ℃, the temperature of the extruder head 2 area is 220 ℃, the speed of a metering pump is 24r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the extruder head is 25cm;

the fiber diameter of the melt-blown nonwoven microfiber layer is 8.7 mu m, the thickness is 0.365mm, the mass per unit area is 49g/m < 2 >, the tensile breaking strength is 31.6N, and the permeable air flow rate under 100Pa pressure difference is 11.8L/min;

Wherein the mass fraction of the polyacrylonitrile in the mixed spinning solution is 8wt%, the mass fraction of the polymeric biguanide antibacterial antiviral agent in the polyacrylonitrile is 1wt%, the electrostatic spinning voltage is 15kV, and the receiving distance is 20cm;

the fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is 0.41 mu m, the thickness is 0.113mm, the mass per unit area is 15g/m < 2 >, the tensile breaking strength is 10.4N, and the permeable air flow rate under 100Pa pressure difference is 22.8L/min;

(4) Preparing a comfortable spunlaced nonwoven microfiber layer;

the viscose fiber diameter is 11.9 mu m, the pre-hydroentangling pressure is 15bar, the main hydroentangling 1 pressure is 45bar, the main hydroentangling 2 pressure is 60bar, the main hydroentangling 3 pressure is 80bar, the main hydroentangling 4 pressure is 65bar, the hydroentangling distance is 10cm, and the net conveying speed is 4m/min;

The thickness of the comfortable spunlaced nonwoven microfiber layer is 0.372mm, the mass per unit area is 50g/m < 2 >, the tensile breaking strength is 49.2N, and the permeable air flow rate under 100Pa pressure difference is 352.7L/min;

The tensile breaking strength of the prepared protective layer fabric is 271.2N, the filtering efficiency of non-oily aerodynamic mass particles with the median diameter of 0.24 mu m is 99%, the antibacterial efficiency of the protective layer fabric on escherichia coli is 99.9999%, the antibacterial efficiency of the protective layer fabric on staphylococcus aureus is 99.9999%, the antiviral efficiency of the protective layer fabric on influenza virus is 99.9%, and the antiviral efficiency of the protective layer fabric on coronavirus is 99.9%.

Example 5

(1) Preparing a spunbond nonwoven microfiber layer;

using a spunbonded spinning net forming device (HD-S, jitaihua large nano materials Co., ltd.) to melt polypropylene slices (S2040, meshed petrochemical) at high temperature by a screw extruder, filtering, metering, extruding from a spinneret orifice, cooling by air flow, negatively drafting, uniformly lapping, hot rolling, and winding to obtain a spunbonded non-woven microfiber layer;

Wherein the temperature of the extruder 1 area is 200 ℃, the temperature of the extruder 2 area is 210 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of a spinning box is 230 ℃, the melt pressure is 8MPa, the rotating speed of a metering pump is 25r/min, the cooling wind pressure is 800Pa, the cooling wind speed is 0.8m/s, the cooling wind temperature is 18 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net curtain frequency is 10Hz;

the fiber diameter of the spun-bonded non-woven microfiber layer was 20.8 μm, the thickness was 0.385mm, and the mass per unit area was 50g/m ² The tensile breaking strength is 144.8N, and the permeable air flow rate is 109.7L/min under 100Pa pressure difference;

(2) Preparing a melt-blown nonwoven microfiber layer;

a melt-blown spinning net forming device (HD-M, jitaihua large nano materials Co., ltd.) is adopted, polypropylene slices (PP 6936G2, ekkimen mobil chemical industry) are melted at high temperature by a screw extruder, then are metered to a spinning component by a metering pump, are extruded from a die head spinning hole, and then form superfine fibers under the action of high-speed hot air flow, and form a melt-blown non-woven micron fiber layer on a collecting device;

wherein the temperature of the extruder 1 area is 180 ℃, the temperature of the extruder 2 area is 220 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of the extruder head 1 area is 220 ℃, the temperature of the extruder head 2 area is 220 ℃, the speed of a metering pump is 20r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the extruder head is 15cm;

The melt-blown nonwoven microfiber layer had a fiber diameter of 5.3 μm, a thickness of 0.352mm, and a mass per unit area of 48g/m ² The tensile breaking strength is 34.4N, and the permeable air flow rate under 100Pa pressure difference is 11.2L/min;

(3) Carrying out on-line or off-line compounding on the spunbonded non-woven micro-fiber layer and the melt-blown non-woven micro-fiber layer to obtain a compound I;

(4) Adding polyacrylonitrile powder (P303197, shanghai Ala Biochemical technology Co., ltd.) into N, N-dimethylformamide by using an electrostatic spinning device (NS Lab, green's Co., ltd.) to dissolve to obtain a solution, adding silver ion antibacterial antiviral agent (HeiQ Viroblock NPJ 03) into the solution to obtain a mixed spinning solution, then carrying out electrostatic spinning under a high-voltage electric field, and forming an electrostatic spinning micro-nanofiber layer (namely an antibacterial and antiviral electrostatic spinning micro-nanofiber layer) on one side of a melt-blown non-woven microfiber layer of the compound I by high-speed stretching, solvent volatilization and solidification under the electric field force, thereby obtaining a compound II;

wherein the mass fraction of the polyacrylonitrile in the mixed spinning solution is 10wt%, the silver ion antibacterial antiviral agent accounts for 12wt% of the polyacrylonitrile, the electrostatic spinning voltage is 15kV, and the receiving distance is 15cm;

The fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is 0.59 mu m, the thickness is 0.143mm, and the unit area mass is 20g/m ² The tensile breaking strength is 16.3N, and the permeable air flow rate is 14.2L/min under 100Pa pressure difference;

(5) Preparing a comfortable spunlaced nonwoven microfiber layer;

opening cotton fibers, removing impurities and carding by adopting a hydroentangled device (Aquajet Y500-2, shanghai Dongxing technology import and export company) to obtain a flat and uniform fiber web, prewetting the carded fiber web before hydroentangled to compact the fiber web, feeding the wetted fibers into a hydroentangled machine, mutually intertwining and cohesion the fibers in the fiber web under the action of high-pressure water jet, and reinforcing the fiber web to form a hydroentangled non-woven micro fiber layer;

wherein the diameter of cotton fiber is 10.7 μm, the pre-hydroentangling pressure is 20bar, the main hydroentangling 1 pressure is 50bar, the main hydroentangling 2 pressure is 65bar, the main hydroentangling 3 pressure is 85bar, the main hydroentangling 4 pressure is 70bar, the hydroentangling distance is 10cm, and the net conveying speed is 4m/min;

the comfortable spunlaced nonwoven microfiber layer has a thickness of 0.361mm and a mass per unit area of 49g/m ² The tensile breaking strength is 53.6N, and the permeable air flow rate is 312.2L/min under 100Pa pressure difference;

(6) Carrying out multi-layer offline compounding on the compound II and the comfortable spunlaced non-woven microfiber layer to obtain a protective layer fabric; wherein, the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is attached to the comfortable spunlaced non-woven micro-fiber layer.

The tensile breaking strength of the prepared protective layer fabric is 280.6N, the filtering efficiency of non-oily aerodynamic mass particles with the median diameter of 0.24 mu m is 99%, the antibacterial efficiency of the protective layer fabric on escherichia coli is 99.9999%, the antibacterial efficiency of the protective layer fabric on staphylococcus aureus is 99.9999%, the antiviral efficiency of the protective layer fabric on influenza virus is 99.999%, and the antiviral efficiency of the protective layer fabric on coronavirus is 99.999%.

Example 6

(1) Preparing a spunbond nonwoven microfiber layer;

wherein the temperature of the extruder 1 area is 200 ℃, the temperature of the extruder 2 area is 210 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of a spinning box is 230 ℃, the melt pressure is 6MPa, the rotating speed of a metering pump is 25r/min, the cooling wind pressure is 800Pa, the cooling wind speed is 0.8m/s, the cooling wind temperature is 20 ℃, the hot rolling temperature is 110 ℃, the hot rolling pressure is 60N/mm, and the net curtain frequency is 10Hz;

The fiber diameter of the spun-bonded non-woven microfiber layer was 21.0 μm, the thickness was 0.381mm, and the mass per unit area was 50g/m ² The tensile breaking strength is 142.4N, and the permeable air flow rate under 100Pa pressure difference is 110.5L/min;

(2) Preparing a melt-blown nonwoven microfiber layer;

wherein the temperature of the extruder 1 area is 180 ℃, the temperature of the extruder 2 area is 220 ℃, the temperature of the extruder 3 area is 220 ℃, the temperature of the extruder 4 area is 220 ℃, the temperature of the extruder 5 area is 220 ℃, the temperature of the extruder head 1 area is 220 ℃, the temperature of the extruder head 2 area is 220 ℃, the speed of a metering pump is 20r/min, the heating wind pressure is 0.6MPa, and the receiving distance of the extruder head is 20cm;

the melt-blown nonwoven microfiber layer had a fiber diameter of 6.2 μm, a thickness of 0.337mm and a mass per unit area of 42g/m ² The tensile breaking strength is 28.2N, and the permeable air flow rate is 14.5L/min under 100Pa pressure difference;

wherein the mass fraction of the polyacrylonitrile in the mixed spinning solution is 10wt%, the silver ion antibacterial antiviral agent accounts for 10wt% of the polyacrylonitrile, the electrostatic spinning voltage is 15kV, and the receiving distance is 20cm;

the fiber diameter of the antibacterial and antiviral electrostatic spinning micro-nano fiber layer is 0.44 mu m, the thickness is 0.145mm, and the unit area mass is 20g/m ² The tensile breaking strength is 18.8N, and the permeable air flow rate under 100Pa pressure difference is 14.6L/min;

(5) Preparing a comfortable spunlaced nonwoven microfiber layer;

wherein the diameter of cotton fiber is 11.9 μm, the pre-hydroentangling pressure is 20bar, the main hydroentangling 1 pressure is 50bar, the main hydroentangling 2 pressure is 65bar, the main hydroentangling 3 pressure is 85bar, the main hydroentangling 4 pressure is 70bar, the hydroentangling distance is 10cm, and the net conveying speed is 4m/min;

the comfortable spunlaced nonwoven microfiber layer has a thickness of 0.358mm and a mass per unit area of 50g/m ² The tensile breaking strength is 51.0N, and the permeable air flow rate under 100Pa pressure difference is 319.3L/min;

The tensile breaking strength of the prepared protective layer fabric is 274.4N, the filtering efficiency of particles with the median diameter of 0.24 mu m in non-oily aerodynamic quality is 99%, the antibacterial efficiency of the protective layer fabric against escherichia coli is 99.999%, the antibacterial efficiency of the protective layer fabric against staphylococcus aureus is 99.999%, the antiviral efficiency of the protective layer fabric against influenza virus is 99.99%, and the antiviral efficiency of the protective layer fabric against coronavirus is 99.99%.

The preparation method of the filter element provided by the application is specifically referred to the following examples.

Example 7

A filter core is formed by compounding three layers of non-woven materials, and the preparation method is basically the same as that of the embodiment 1, except that the embodiment 7 does not have the step (4), and the step (5) is to compound the spun-bonded non-woven micro-fiber layer, the melt-blown non-woven micro-fiber layer and the antibacterial and antiviral electrostatic spinning micro-nano-fiber layer in a multi-layer off-line manner.

The prepared filter core sequentially comprises a spun-bonded non-woven micro-fiber layer, a melt-blown non-woven micro-fiber layer and an antibacterial and antiviral electrostatic spinning micro-nano-fiber layer from outside to inside; the filter core has a median diameter of 0.24 μm, a filtering efficiency of 99%, an antibacterial efficiency of 100% for Escherichia coli, an antibacterial efficiency of 100% for Staphylococcus aureus, an antiviral efficiency of 99.99% for influenza virus, and an antiviral efficiency of 99.99% for coronavirus.

Example 8

A filter core is formed by compounding three layers of non-woven materials, and the preparation method is basically the same as that of the embodiment 2, except that the embodiment 8 does not have the step (4), and the step (5) is to compound the spun-bonded non-woven micro-fiber layer, the melt-blown non-woven micro-fiber layer and the antibacterial and antiviral electrostatic spinning micro-nano-fiber layer in a multi-layer off-line manner.

The prepared filter core sequentially comprises a spun-bonded non-woven micro-fiber layer, a melt-blown non-woven micro-fiber layer and an antibacterial and antiviral electrostatic spinning micro-nano-fiber layer from outside to inside; the filter core has a median diameter of 0.24 μm, a filtering efficiency of 99%, an antibacterial efficiency of 99.9999% for Escherichia coli, an antibacterial efficiency of 99.9999% for Staphylococcus aureus, an antiviral efficiency of 99.9% for influenza virus, and an antiviral efficiency of 99.9% for coronavirus.

Example 9

A filter core is formed by compounding three layers of non-woven materials, and the preparation method is basically the same as that of the embodiment 5, except that the embodiment 9 does not have the step (5) and the step (6), and the compound II is the filter core.

The prepared filter core sequentially comprises a spun-bonded non-woven micro-fiber layer, a melt-blown non-woven micro-fiber layer and an antibacterial and antiviral electrostatic spinning micro-nano-fiber layer from outside to inside; the filter core has a median diameter of 0.24 μm, a filtering efficiency of 99%, an antibacterial efficiency of 99.9999% for Escherichia coli, an antibacterial efficiency of 99.9999% for Staphylococcus aureus, an antiviral efficiency of 99.999% for influenza virus, and an antiviral efficiency of 99.999% for coronavirus.

Example 10

A filter element is formed by compounding three layers of non-woven materials, and the preparation method is basically the same as that of example 6, except that example 10 does not have the step (5) and the step (6).

The prepared filter core sequentially comprises a spun-bonded non-woven micro-fiber layer, a melt-blown non-woven micro-fiber layer and an antibacterial and antiviral electrostatic spinning micro-nano-fiber layer from outside to inside; the filter core has a median diameter of 0.24 μm, a filtering efficiency of 99%, an antibacterial efficiency of 99.999%, an antiviral efficiency of 99.99%, and an antiviral efficiency of 99.99%.

The preparation method of the outer protective layer 101 and the bottom protective layer 102 fabric (i.e., the bedspread main body protective layer fabric 500) can be as shown in any one of embodiments 1 to 6; the filter element used for the filter 202 in the automatic filtration blower 200 is composed of three layers of nonwoven materials, and the preparation method thereof can be as shown in any one of examples 7 to 10.

The application provides a protective isolation bed system, which comprises the following specific use processes:

in operation, the air pressure detection control device 300 detects the internal air pressure to ensure positive pressure, the filter 202 sucks in ambient air, the ambient air is filtered and purified to form clean air, the clean air is sent into the bedspread main body through the air inlet pipe 201, and redundant air is discharged to the outside through the bedspread main body protective fabric and the exhaust pipe 400, so that the controllable flow of air flow in the bedspread is realized. The bedspread main body can be used by disposable or repeated disinfection, can be matched with a sickbed in an ordinary ward, and solves the problems of the quantity and the price of the isolation ward and the laminar flow bed.

Claims

1. The protective isolation bed system is characterized by comprising a bed cover main body, an automatic filtering air supply device (200), an air inlet pipe (201), an exhaust pipe (400) and an air pressure detection control device (300); the automatic filtering air supply device (200) is arranged outside the bedspread main body and is communicated with the inner space of the bedspread main body through an air inlet pipe (201); the inner space of the bedspread main body is communicated with the outer space of the bedspread main body through an exhaust pipe (400), an electromagnetic air outlet valve is arranged on the exhaust pipe (400), and the electromagnetic air outlet valve is in control connection with the air pressure detection control device (300); the air pressure detection control device (300) is in communication connection with the automatic filtering air supply device (200); the air pressure of the inner space of the bedspread main body is set to be larger than the atmospheric pressure; the bedspread main body is an elastic metal framework folding tent with a protective layer fabric.

2. The guard isolation bed system of claim 1, wherein the pressure of the interior space of the bed cover body is set to be greater than 5 to 10Pa of atmospheric pressure.

3. The protective insulated bed system according to claim 1, wherein the bed cover body comprises a peripheral outer protective layer (101) and a bottom protective layer (102) at the bottom, the outer protective layer (101) and the bottom protective layer (102) being integrated.

4. A protective insulated bed system according to claim 3, characterized in that the bed cover body comprises an elastic framework as a supporting structure, which is sewn to the outer protective layer (101); both sides of the external protective layer (101) are provided with a waterproof sealing zipper and a transparent operation observation window.

5. The guard isolation bed system of claim 1, wherein the air pressure detection control device (300) comprises a pressure sensor, a wireless transmitter, a wireless receiver, a first air pressure controller; the pressure sensor is in communication connection with the wireless transmitter, the wireless receiver is in communication connection with the first air pressure controller, and the first air pressure controller is in control connection with the electromagnetic air outlet valve; the automatic filtering air supply device (200) comprises a second air pressure controller, a filter and an air supply device; the first air pressure controller is in communication connection with the second air pressure controller.