CN111920120A

CN111920120A - Production process of nanofiber protective mask

Info

Publication number: CN111920120A
Application number: CN202010712073.9A
Authority: CN
Inventors: 冯朝阳; 陈江中
Original assignee: Jiangsu Nayi Environmental Protection Technology Co ltd
Current assignee: Jiangsu Nayi Environmental Protection Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2020-11-13

Abstract

The invention discloses a production process of a nanofiber protective mask, which comprises the steps of melting raw materials of hydrophobic materials to form liquid to be drawn; arranging two high-voltage electrode ends, wherein the two high-voltage electrode ends form a high-voltage interval; the spray head sprays the liquid drops to be wire-drawn from the side lower part of the feed liquid bearing piece, and the liquid drops to be wire-drawn are attached to the feed liquid bearing piece under the combined action of the spray force of the spray head and the high-pressure interval; the high-voltage electrostatic field breaks down the liquid drop to be drawn to form jet flow from the cone end of the liquid drop to be drawn, and the liquid drop to be drawn generates nano-fiber filaments under the action of high voltage; the nano-fiber silk is attached to the base material to generate a nano-fiber filter layer; and (3) attaching the nanofiber filter layer to a non-woven fabric substrate for manufacturing the mask, and cutting and hot-pressing to obtain the mask. The nanofiber layer is formed through high-pressure spinning, so that the filtering pore diameter of 0.1-0.2 mu m or smaller can be formed, the propagation of bacteria is effectively blocked, and the protection effect is good. The nanofiber layer with high coverage and integrity is used for physical filtration, and the problem of failure of the electrostatic layer is not required to be considered.

Description

Production process of nanofiber protective mask

Technical Field

The invention relates to the field of articles for daily use, in particular to a production process of a nanofiber protective mask.

Background

The mask is a sanitary article, is worn at the mouth and nose part for filtering air entering the mouth and nose so as to achieve the effect of blocking harmful gas, smell, spray, virus and other substances, and is generally made of gauze or paper and the like. The mask has a certain filtering function on air entering the lung, and has a very good effect when being worn in respiratory infectious diseases and working in environments polluted by dust and the like.

Along with the improvement of the living standard of people, the requirements of people on the living quality are higher and higher, the challenges are more and more, and the protection effect of the mask is very important for the life safety of people in the period of epidemic prevention or in the medical occasion. In the prior art, the following problems occur in the mask:

technical document 1 (application No. cn201610712833.x) discloses a production process of matte non-woven fabric for a mask, which comprises material selection, material mixing, opening and carding, hot rolling, matte, winding and slitting. The invention adopts PP/PE composite fiber with two fineness of hydrophilicity or water repellency as raw material, and hot rolling is carried out by the smooth surface roller, thus obtaining the non-woven fabric with smoother surface.

Technical document 2 (application No. cn200910110331.x) discloses an antistatic antibacterial non-woven fabric, a preparation method thereof and a mask manufactured by using the same, the antistatic antibacterial non-woven fabric comprises the following components: polypropylene: 60-98 parts; antibacterial agents: 1-20 parts; antistatic master batch: 1-20 parts. The preparation method of the antistatic antibacterial non-woven fabric comprises the following steps: preparing raw materials: providing 60-98 parts of polypropylene, 1-20 parts of antistatic master batch and 1-20 parts of silver-loaded zirconium phosphate or silver-loaded zeolite antibacterial agent; and then the raw materials are molded into the antistatic antibacterial non-woven fabric through a non-woven fabric manufacturing process. The antistatic antibacterial mask comprises: the mask body is formed by compounding a plurality of layers of antistatic antibacterial non-woven fabrics. According to the invention, the silver-loaded zeolite and the antistatic master batch are added in the forming process of the polypropylene non-woven fabric to prepare the antistatic antibacterial non-woven fabric, and then the antistatic antibacterial non-woven fabric is compounded to obtain the antistatic antibacterial mask, wherein the mask can prevent the invasion of germs and can avoid the generation of static electricity.

Technical document 3 (application No. CN201410053752.4) discloses a non-woven fabric for a mask and a production process thereof, wherein the anti-static antibacterial non-woven fabric comprises the following components: the antistatic antibacterial non-woven fabric is prepared from the raw materials of, by weight, 15 parts of silver-loaded zirconium phosphate, 0.8 part of an antistatic agent HD-350, 0.8 part of an antistatic agent HD-200, 1 part of lecithin and 3 parts of polylactic acid. The mask body is compounded by the non-woven fabric, so that the mask can prevent the invasion of pathogenic bacteria and the generation of static electricity, can improve the use comfort, and is convenient for electronic industry workers to use.

The above-mentioned comparison document reveals the following problems in the prior art:

1. gauze mask among the prior art makes through non-woven fabrics and melt-blown fabric, and filterable aperture is not of uniform size, and filter aperture is more than 300um, and temporary when the epidemic situation comes, the propagation of the unable separation bacterium of hospital's gauze mask obviously, and the protecting effect is poor.

2. The mask in the prior art is internally charged with static electricity or added with an electrostatic layer to prevent viruses or bacteria, after the mask is used for 4 hours, the effect is lost, the mask cannot be reused, the using time or the number of times of the mask is related to the safety and the danger of people in the occasion of urgently needing the mask, and the mask in the prior art obviously cannot meet the requirement and cannot be reused for a long time or repeatedly.

3. Although the mask in the prior art has a certain filtering effect, the waterproof effect is poor, once water penetrates through the mask, bacteria or viruses in the water also penetrate through the mask, and the transmission of the viruses cannot be blocked.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a production process of a nanofiber protective mask, which can solve the problems of poor protective effect and no sterilization effect.

One of the purposes of the invention is realized by adopting the following technical scheme:

a production process of a nanofiber protective mask comprises the following steps:

material melting: melting raw materials of a hydrophobic material to form liquid to be drawn, adding metal powder with an antibacterial function into the liquid to be drawn, and uniformly stirring;

a high-pressure forming step: arranging two high-voltage electrode ends, wherein the two high-voltage electrode ends form a high-voltage interval, an acting force from bottom to top is formed in the high-voltage interval, and a base material for bearing the drawn wire is arranged in the high-voltage interval and arranged on the upper side of the spray head;

side dripping step: the spray head sprays the liquid drops to be wire-drawn from the side lower part of the feed liquid bearing piece, and the liquid drops to be wire-drawn are attached to the feed liquid bearing piece under the combined action of the spray force of the spray head and the high-pressure interval;

high-pressure wire drawing: the high-voltage electrostatic field breaks down the liquid drop to be drawn to form jet flow from the cone end of the liquid drop to be drawn, and the liquid drop to be drawn generates nano-fiber filaments under the action of high voltage;

a bonding step: the nano-fiber silk is attached to the base material to generate a nano-fiber filter layer;

the manufacturing steps are as follows: and (3) attaching the nanofiber filter layer to a non-woven fabric substrate for manufacturing the mask, and cutting and hot-pressing to obtain the mask.

Further, in the material melting step, nano copper powder and/or nano silver powder are/is added into the liquid to be drawn.

Further, in the high pressure forming step, the substrate passes through a high pressure zone and moves at a certain speed.

Further, in the side dripping step, the spray heads spray the liquid drops to be drawn to the feed liquid bearing member from the left lower side and the right lower side of the feed liquid bearing member respectively.

Further, in the high-pressure wire drawing step, a material liquid bearing part is arranged in the high-pressure section, and liquid is dripped back and forth along the length direction of the material liquid bearing part.

Further, in the side liquid dropping step, the material liquid bearing member is a steel wire rope.

And further detecting whether the laminating accumulation degree of the nanofiber filaments is enough to form the nanofiber filtering layer, if so, executing the next step, and if not, reducing the moving speed of the base material.

Further, install cleaning wheel and shower nozzle together and remove together, after the dropping liquid, whether detect and remain the vestige, if, clear up the feed liquid through cleaning wheel and hold the thing, if not, continue the dropping liquid.

Further, whether detect feed liquid and hold the carrier and need clear up, if, promote clean wheel and hold the carrier until laminating feed liquid, if not, descend clean wheel, make clean wheel keep away from feed liquid and hold the carrier.

Further, a negative end and a positive end are formed in the high-voltage interval, liquid to be drawn is dripped near the negative end, and under the action of high voltage, the nano-fiber filaments are drawn and moved to the positive end, and the negative end is arranged right below the positive end.

Compared with the prior art, the invention has the beneficial effects that:

1. the nanofiber layer is formed through high-pressure spinning, so that the filtering pore diameter of 0.1-0.2 um or smaller can be formed, the propagation of bacteria is effectively blocked, and the protection effect is good. And every feed liquid holds carrier and corresponds both sides shower nozzle and spout the glue simultaneously, this is the key that guarantees that the wire drawing covers the high degree of integrity in certain area, can guarantee that feed liquid holds carrier and corresponds the effective utilization of spouting gluey region, and then can guarantee the completeness and the degree of fullness that the wire drawing covered, avoids appearing the problem that the overburden is thinner or the degree of integrity is not high.

2. Carry out physics through the nanofiber layer that coverage and completeness are high and filter, need not to consider the problem that the static layer became invalid, can use for a long time, also can be through used repeatedly after high temperature disinfection or the disinfection, when the shortage problem appears in the gauze mask, can guarantee normal use through used repeatedly many times.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a flow chart of the production process of the nanofiber protective mask of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present application discloses a production process of a nanofiber protective mask, which comprises the following steps:

material melting: melting raw materials of a hydrophobic material to form liquid to be drawn, adding metal powder with an antibacterial function into the liquid to be drawn, and uniformly stirring; in practical application, hydrophobic particles are adopted in the hydrophobic material, the hydrophobic particles are melted into a liquid state at high temperature, and then preparation is made for liquid dropping, the preparation is necessary preparation for high-pressure wire drawing, and wire drawing failure or the requirement of nanometer level cannot be met necessarily due to the adoption of a non-liquid dropping method. The nano-grade wire is generated by drawing through ten thousand volts of high pressure difference, and then a nano-grade net is generated, and the nano-grade net is used for filtering, belongs to physical filtering and can be used repeatedly or for a long time.

Preferably, in the material melting step, metal powder with an antibacterial function is added into the liquid to be drawn, and the mixture is uniformly stirred. In the specific application, the nano copper powder and/or nano silver powder are added into the liquid to be drawn and are uniformly stirred. By adding the nano copper powder and/or the nano silver powder, the nano copper powder and/or the nano silver powder are/is fully mixed with the liquid to be drawn, so that the nano copper or the nano silver is fully filled on the nano fiber generated after high-pressure drawing, the sterilization effect is further ensured, and the droplets and aerosol containing bacteria are blocked. Regarding the question whether the nano-copper or silver powder will be inhaled by humans, the food additive expert committee of the subordinates of the world health organization at first considered that there was no health problem for an adult weighing 60 kg to ingest 30 mg of copper per day for the lifetime. Furthermore, nanocopper does not present cumulative toxicity, such as: the copper ions and connective tissues in the yam are greatly helpful for human development and have obvious curative effects on vascular system diseases, and the calcium in the iron stick yam has extremely high curative effects on injury of tendons and bones, osteoporosis and tooth loss; secondly, the nano copper powder and the nano silver powder are solidified on the nano fiber filament, and cannot be separated easily, so that the problem of being inhaled by people cannot occur, and the nano copper powder and the nano silver powder can be used safely.

Furthermore, the heavy metal ions can kill cells, such as copper and mercury, and kill bacteria, and the protein is solidified to destroy the cell structure and inactivate the cells, and other heavy metals can be used as the metal powder with the antibacterial function.

specifically, the voltage reaches tens of thousands or hundreds of thousands or even millions of volts in practical application through higher voltage difference, and the effect of high-voltage wire drawing is further ensured. In the high pressure forming step, the substrate passes through a high pressure zone and moves at a certain speed. The movement of the base material for bearing the drawn wires ensures the continuous production of the nanofiber layer, the liquid drops are drawn in a high-pressure interval from bottom to top, the base material moves in the left-right direction, the moving speed and the start-stop are determined according to the covering effect of high-voltage electrostatic spinning, and the continuity is good.

Side dripping step: the spray head sprays the liquid drops to be wire-drawn from the side lower part of the feed liquid bearing piece, and the liquid drops to be wire-drawn are attached to the feed liquid bearing piece under the combined action of the spray force of the spray head and the high-pressure interval; specifically, in the present embodiment, in the side dropping step, the heads eject the droplets to be drawn toward the feed liquid carrier from below the left side and below the right side of the feed liquid carrier, respectively. Other forms may also be employed:

the first mode is as follows: if the material dropping block covering the material liquid bearing part is used for dropping liquid, the material dropping block penetrates through the rope body, the material dropping block moves away after the liquid dropping is completed, the liquid drop can be used for drawing wires in a high-pressure region, the wire drawing efficiency can be obviously reduced, and the problem of shielding the liquid drop wire drawing exists.

And a second mode: the dropping liquid is carried out along the top that the feed liquid held the carrier, but the direction of dropping liquid is opposite with the regional effort of high pressure, influences dropping liquid efficiency and wire drawing effect.

Specifically, in the side liquid dropping step, the feed liquid bearing member is a steel wire rope. The high-pressure interval is provided with a feed liquid bearing member, and liquid dropping back and forth along the length direction of the feed liquid bearing member is realized. The feed liquid bearing piece or the steel wire rope has the twisting effect, so that the contact area of liquid drops is enlarged, and the wire drawing effect is improved

in the high-pressure wire drawing step, whether the material liquid bearing member needs to be cleaned or not is detected, if yes, the cleaning wheel is lifted until the material liquid bearing member is attached, and if not, the cleaning wheel is lowered to enable the cleaning wheel to be far away from the material liquid bearing member. Firstly, through cleaning wheel and shower nozzle synchronous motion, when the guarantee dropping liquid goes on, clear up the work, also clear up after the stop work, the cleaning efficiency is high and the interference degree is little, secondly, the both sides of shower nozzle all are provided with cleaning wheel, can all clear up around the shower nozzle hydrojet, the cleaning effect is good, the accessible is adjusted and is carried out unilateral clearance or two side clearance, and then the four kinds of modes of clearance after selecting the clearance before the hydrojet, clearance behind the hydrojet, clearance around the hydrojet and the stop work.

In the practical application in-process, after the dropping liquid, whether detect and remain the vestige, if, clear up the stock solution through the cleaning wheel and hold the thing, if not, continue the dropping liquid. The continuity of the aim at guarantee equipment that cleaning wheel clearance material set up, the pressure differential of considering last ten thousand volts of voltage if there is remaining vestige in the equipment, if closing device clears up, must can increase the cost, influences production efficiency, if do not close the machine clearance, has great risk again, so automatic cleaning wheel clearance is a more reasonable clearance mode, and the effect of guarantee wire drawing avoids remaining. And forming a negative end and a positive end in a high-voltage interval, dripping the liquid to be drawn near the negative end, drawing wires and moving the nano-fiber wires to the positive end under the action of high voltage. In the high-voltage wire drawing step, the negative electrode terminal is disposed just below the positive electrode terminal. The negative electrode end and the positive electrode end are planar, and in order to optimize the effect, a certain degree of wind can be added between the positive electrode and the negative electrode, so that the smoothness of the attachment of the nanofiber filaments is guaranteed.

Specifically, in the high-pressure wire drawing step, the cleaning wheel and the spray head are mounted together and move together, after liquid dropping, whether residual traces appear or not is detected, if yes, the material liquid bearing piece is cleaned through the cleaning wheel, and if not, liquid dropping is continued.

specifically, when the current area of the substrate is covered with a certain degree of nano-fiber filaments, the substrate is moved to enable the uncovered part to be located in the high-voltage area. The nanofiber silk is attached to the base material, and the moving direction of the base material is parallel to the length direction of the nanofiber silk attached to the base material, so that the smoothness is guaranteed. And detecting whether the laminating accumulation degree of the nano-fiber yarns is enough to form a nano-fiber filtering layer, if so, executing the next step, and if not, reducing the moving speed of the base material. The method is characterized in that the control of the base material is crucial, the adjustable speed is adopted, the covering requirement of the nanofiber layer can be met, if the movement of the base material is not adjusted, the covering requirement of the nanofiber layer cannot be met easily, in the laminating step, the base material is arranged in a high-pressure interval and is arranged near the positive electrode end, and the base material moves in the direction perpendicular to the feed liquid bearing piece. The base material moves along the direction perpendicular to the feed liquid bearing piece, which is one of necessary measures for guaranteeing the smoothness of the attachment, so that the smoothness of the attachment of the nanofiber yarns can be guaranteed, and the continuity of the attachment of the nanofiber yarns can be guaranteed. In this application, carry out physics through the nanofiber layer that coverage and completeness are high and filter, need not to consider the problem that the static layer became invalid, can use for a long time, also can be through used repeatedly after high temperature disinfection or the disinfection, when the shortage problem appears in the gauze mask, can guarantee normal use through used repeatedly many times.

The manufacturing steps are as follows: and (3) attaching the nanofiber filter layer to a non-woven fabric substrate for manufacturing the mask, and cutting and hot-pressing to obtain the mask. In practical application, the feed liquid holds carrier and is the strip, two high voltage electrode are plane, the direction that perpendicular to feed liquid held carrier is followed to the nanofiber substrate removes, the feed liquid holds carrier and goes up the dropping liquid after, high pressure makes the liquid wire drawing and move towards anodal, the nanofiber substrate removes with certain speed or certain removal interval time, make the nanofiber silk laminating on the substrate, after the certain area of laminating, the overlapping multilayer cladding of nanofiber silk, and then form nanometer level's net, the particle diameter of the droplet of general carrying bacterium or aerosol is about 0.3um, both can block through nanometer level's net, can kill the poison through nanometer copper and nanometer silver on the nanofiber silk again, air-purifying.

In the application, the nanofiber layer is formed through high-pressure spinning, so that the filtering pore diameter of 0.1-0.2 mu m or smaller can be formed, the propagation of bacteria is effectively blocked, and the protection effect is good. And every feed liquid holds carrier and corresponds both sides shower nozzle and spouts the glue simultaneously, this is the key that guarantees that wire drawing covering integrity is high in the certain area, can guarantee the regional effective utilization of spouting the glue of feed liquid holding carrier correspondence, and then can guarantee the integrity and the degree of fullness that the wire drawing covered, avoid appearing the problem that the overburden is thinner or the integrity is not high, in practical application, the problem that wire drawing covering integrity is not enough after shower nozzle hydrojet in the shower nozzle region appears very easily, this problem that the filter layer became invalid appears very easily, in case this problem appears, the gauze mask will become invalid completely, can't the separation virus.

In this application, it is crucial to use hydrophobic particles to form the droplets with stringy lines, and once water permeates the mask, it means that bacteria or viruses in the water also permeate the mask and cannot block the transmission of the viruses. By adopting the hydrophobic particles, water drops are prevented from passing through, and viruses are effectively prevented from entering the interior of the inlet cover through the water drops and the droplets.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A production process of a nanofiber protective mask is characterized by comprising the following steps:

2. The production process of the nanofiber protective mask as set forth in claim 1, wherein: and in the material melting step, adding nano copper powder and/or nano silver powder into the liquid to be drawn.

3. The production process of the nanofiber protective mask as set forth in claim 1, wherein: in the high pressure forming step, the substrate passes through a high pressure zone and moves at a certain speed.

4. The production process of the nanofiber protective mask as set forth in claim 1, wherein: in the side dripping step, the spray heads spray the liquid drops to be drawn to the feed liquid bearing member from the left lower side and the right lower side of the feed liquid bearing member respectively.

5. The production process of the nanofiber protective mask as set forth in claim 1, wherein: in the high-pressure wire drawing step, a material liquid bearing part is arranged in a high-pressure interval, and liquid dropping is carried along the length direction of the material liquid bearing part back and forth.

6. The production process of the nanofiber protective mask as set forth in claim 1, wherein: in the side liquid dropping step, the material liquid bearing part adopts a steel wire rope.

7. The production process of the nanofiber protective mask as set forth in claim 1, wherein: and in the laminating step, detecting whether the laminating accumulative degree of the nanofiber filaments is enough to form a nanofiber filtering layer, if so, executing the next step, and if not, reducing the moving speed of the base material.

8. The production process of the nanofiber protective mask as set forth in claim 4, wherein: in the high-pressure wire drawing step, the cleaning wheel and the spray head are mounted together and move together, after liquid dropping, whether residual traces occur or not is detected, if yes, the material liquid bearing piece is cleaned through the cleaning wheel, and if not, liquid dropping is continued.

9. The production process of the nanofiber protective mask as set forth in claim 8, wherein: in the high-pressure wire drawing step, whether the material liquid bearing member needs to be cleaned or not is detected, if yes, the cleaning wheel is lifted until the material liquid bearing member is attached, and if not, the cleaning wheel is lowered to enable the cleaning wheel to be far away from the material liquid bearing member.

10. The production process of the nanofiber protective mask as set forth in claim 1, wherein: and forming a negative end and a positive end in a high-voltage interval, dripping liquid to be drawn near the negative end, drawing wires and moving the nano-fiber wires to the positive end under the action of high voltage, and arranging the negative end under the positive end.