阅读说明：本技术 基于离子液体和微电场的过滤组件及应用 (Filtering component based on ionic liquid and micro-electric field and application ) 是由 瞿广飞 吴丰辉 陈远翔 李军燕 王芳 李自赢 杨灿 于 2021-02-22 设计创作，主要内容包括：本发明公开了一种基于离子液体和微电场的过滤组件,其包括纽扣电池、柔性导电正极、柔性导电负极,柔性导电正极、柔性导电负极分别与纽扣电池连接；本发明过滤组件制备简单,制造成本低,具有双重防护效果；适用范围广,对浮尘、病毒及其携带病毒的气溶胶防护效果好,在有电条件下,可以重复使用。(The invention discloses a filtering component based on ionic liquid and a micro-electric field, which comprises a button battery, a flexible conductive anode and a flexible conductive cathode, wherein the flexible conductive anode and the flexible conductive cathode are respectively connected with the button battery; the filter assembly is simple to prepare, low in manufacturing cost and has double protection effects; the application range is wide, the protection effect on floating dust, viruses and aerosol carrying the viruses is good, and the aerosol can be repeatedly used under the condition of electricity.)

1. A filter assembly based on ionic liquid and micro-electric field is characterized in that: the button cell comprises a button cell, a flexible conductive anode and a flexible conductive cathode, wherein the flexible conductive anode and the flexible conductive cathode are respectively connected with the button cell.

2. The ionic liquid and micro-electric field based filter assembly according to claim 1, wherein the flexible conductive positive electrode or the flexible conductive negative electrode is prepared by the following method:

(1) grinding a conductive material until the particle size is smaller than 200 meshes, placing the ground material in an ethanol solution with the mass concentration of 5-20%, stirring and mixing uniformly at 200-1200 rpm, adding a PTFE emulsion with the mass of 2-10% of the mixture and active alumina with the mass of 5-10% of the mixture, stirring for 5-30 min at 200-1200 rpm, continuing stirring and mixing for 30-60 min at 30-70 ℃ to obtain mixed slurry, placing the mixed slurry under a pair roller machine, repeatedly rolling the mixed slurry into a sheet with the thickness of 1-2 mm, and drying to obtain a flexible electrode;

(2) adding 0.1-1 g of CaH into 100mL of acetonitrile₂Stirring and refluxing the mixture for reaction for 10 to 12 hours at the temperature of 70 to 85 ℃ in an oil bath, and cooling the mixture to normal temperature to prepare anhydrous acetonitrile; the flexible electrode is dried for 0.5-1 h at 50-80 ℃ in a nitrogen atmosphere, after the nitrogen atmosphere is reduced to room temperature, ionic liquid and anhydrous acetonitrile are added, reflux stirring is carried out for 8-12 h at 80-90 ℃, the temperature is reduced to room temperature in the nitrogen atmosphere, filtering is carried out, anhydrous acetonitrile is used for washing, and finally drying is carried out for 8-12 h at 100-120 ℃.

3. The ionic liquid and micro-electric field based filtration assembly of claim 2, wherein: the conductive material is one of porous carbon, porous carbon silicon, graphene, carbon nano tube, fullerene, silver and copper.

4. The ionic liquid and micro-electric field based filtration assembly of claim 2, wherein: the ionic liquid is [ Hmim ]]Tf₂N、[Hmim]CuCl₂、[Hmim]FeCl₄One kind of (1).

5. The ionic liquid and micro-electric field based filtration assembly of claim 2, wherein: the volume ratio of the ionic liquid to the anhydrous acetonitrile is 1-5: 10-20.

6. A mask comprising the ionic liquid and micro-electric field based filter assembly of any one of claims 1-5.

Technical Field

The invention relates to a mask filtering assembly based on ionic liquid and a micro electric field and application thereof in mask preparation, and belongs to the field of protective equipment.

Background

The floating dust in the air can cause pneumoconiosis due to human inhalation, and the virus is the warrior of many infectious diseases, is an important factor for outbreak of infectious diseases, and is generally infected through the way of entrainment in the air and virus in water, etc., thus posing great threat to human health and environmental safety. The virus has stronger vitality, the virus organism is composed of genetic material and protein shell, and can be attached to aerosol and diffused along with the movement of air, the existing method for removing the virus comprises ultrafiltration membrane filtration method, activated carbon adsorption method, macromolecule flocculation precipitation method and the like, the method is generally applied to the adsorption of the virus in solution, some methods are inconvenient to use, some methods have higher cost, most methods are disposable, the repeated use cannot be achieved, a large amount of pollutants are caused, and the pollutants are retained in the environment for a long time and can slowly release the adsorbed virus microorganisms, thereby further harming the health of human bodies.

CN201120236960.X discloses an antiviral mask, which comprises a mask body, a left ear protection earcap and a right ear protection earcap, wherein the left ear protection earcap is sleeved on the left side of the mask body, the right ear protection earcap is sleeved on the right side of the mask body, the mask body comprises a dustproof filtering component, a virus filtering component and a nursing filtering component which are in a sheet structure and are sequentially arranged, the dustproof filtering component at least comprises four layers of breathable fabrics, the virus filtering component at least comprises four layers of anion adsorption breathable fabrics, the nursing filtering component at least comprises four layers of breathable fabrics, the dustproof filtering component firstly carries out primary filtering, then the virus filtering component adsorbs viruses and bacteria, and then the nursing filtering component is contacted with the skin after treatment, so that the sick individuals are prevented from transmitting harmful substances, thereby the infection sources are cut off, and the diffusion of the viruses is effectively inhibited, but the application range of the invention is not wide, and the adsorption saturation degree of the adsorption materials cannot, there may be problems of adsorption breakthrough and the like. CN201010150858.8 proposes an application of polypyrrole composite fiber in the aspect of virus adsorption, firstly positive charges are introduced into the fiber through an in-situ polymerization technology, so that the prepared polypyrrole composite fiber has abundant positive charges, and viruses with negative charges are adsorbed and filtered by utilizing the principle that the positive charges and the negative charges are mutually attracted.

Disclosure of Invention

Aiming at the existing masks in the market, most masks are disposable masks, adsorption materials in the masks are easy to reach adsorption saturation, the masks cannot be reused after the adsorption saturation, secondary pollution is caused, the adsorption performance is not good, and only particles with larger particle sizes in the air can be adsorbed, the invention provides a filtering assembly based on ionic liquid and a micro-electric field.

The method is mainly based on the special electronegativity of floating dust, viruses and aerosol carrying the viruses, the ionic liquid modified flexible electrode has good conductivity, the filtering component comprises two layers of ionic liquid modified flexible electrodes, the ionic liquid modified flexible electrode (flexible conductive negative electrode) connected with the negative electrode is arranged on the outer side, and the ionic liquid modified flexible electrode connected with the positive electrode is arranged on the inner side; under the action of the micro electric field electrode, floating dust with negative electricity, viruses and aerosol carrying the viruses are repelled when approaching the flexible conductive negative electrode and cannot enter the inside of the mask; if the floating dust, the virus and the aerosol carrying the virus move in the environment for a long time, the floating dust, the virus and the aerosol carrying the virus are charged and have positive electricity, and the flexible electrode modified by the ionic liquid with the inner side connected with the positive electrode repels the floating dust, the virus and the aerosol carrying the virus with the positive electricity under the action of an electric field, so that the effect of double insurance is achieved.

The preparation method of the flexible conductive anode or the flexible conductive cathode comprises the following steps:

(1) grinding a conductive material until the particle size is smaller than 200 meshes, placing the ground material in an ethanol solution with the mass concentration of 5-20%, stirring and mixing uniformly at 200-1200 rpm, adding a PTFE emulsion with the mass of 2-10% of the mixture and active alumina with the mass of 5-10% of the mixture, stirring for 5-30 min at 200-1200 rpm, continuing stirring and mixing for 30-60 min at 30-70 ℃ to obtain mixed slurry, placing the mixed slurry under a pair roller machine, repeatedly rolling the mixed slurry into a sheet with the thickness of 1-2 mm, and drying to obtain a flexible electrode;

(2) adding 0.1-1 g of CaH into 100mL of acetonitrile₂Stirring and refluxing the mixture for reaction for 10 to 12 hours at the temperature of 70 to 85 ℃ in an oil bath, and cooling the mixture to normal temperature to prepare anhydrous acetonitrile; drying the flexible electrode at 50-80 ℃ for 0.5-1 h in a nitrogen atmosphere,and after the nitrogen atmosphere is reduced to the room temperature, adding ionic liquid and anhydrous acetonitrile, refluxing and stirring for 8-12 hours at the temperature of 80-90 ℃, reducing the temperature to the room temperature in the nitrogen atmosphere, filtering, washing with anhydrous acetonitrile, and finally drying for 8-12 hours at the temperature of 100-120 ℃ to obtain the catalyst.

The ionic liquid is [ Hmim ]]Tf₂N、[Hmim]CuCl₂、[Hmim]FeCl₄In the present invention, the ionic liquid is prepared by a conventional method, for example, the following literature methods: "Sujatha I, Venkatarthnam G. Coorison of performance of a vacuum adsorption recovery system operating with a sodium hydrosolutorions and hydrosolutorions as reflexes along with an ionic liquid][TF₂N] as the absorbent[J]International Journal of reflection, 2018, 88,370-382 or "Shuangjun C, Weihe S, Haidong C, et al Glycolysis of poly (ethylene terephthalate) waste mixed Lewis acidic requirements [ J]. Journal of Thermal Analysis and Calorimetry:1-9.”。

The conductive material is one of porous carbon, porous carbon silicon, graphene, carbon nano tube, fullerene, silver and copper.

The volume ratio of the ionic liquid to the anhydrous acetonitrile is 1-5: 10-20.

The invention also aims to apply the mask filter component based on the ionic liquid and the micro-electric field in the mask.

The method has the following advantages and effects:

(1) the filter assembly is simple to prepare, low in manufacturing cost and has double protection effects;

(2) the filter assembly has wide application range, good protection effect on floating dust, viruses and aerosol carrying the viruses, and can be repeatedly used under the condition of electricity.

Detailed Description

The present invention is further illustrated by the following examples, but the scope of the invention is not limited to the above-described examples.

Example 1: the filtering component based on the ionic liquid and the micro-electric field comprises a button battery, a flexible conductive anode and a flexible conductive cathode, wherein the flexible conductive anode and the flexible conductive cathode are respectively connected with the button battery; the filtering component is applied to a conventional medical mask, and an intermediate filtering layer of the filtering component is replaced, so that the mask is sequentially provided with a waterproof layer, a flexible conductive cathode, a flexible conductive anode and a comfort layer from outside to inside, and the flexible conductive anode and the flexible conductive cathode are respectively connected with a button cell and fixed in the mask;

the preparation method of the flexible conductive anode or the flexible conductive cathode comprises the following steps:

(1) grinding graphene until the particle size is smaller than 200 meshes, placing the ground material in an ethanol solution with the mass concentration of 5%, stirring and mixing uniformly at 200rpm, adding PTFE emulsion with the mass of 2% of the mixture and active alumina with the mass of 5% of the mixture, stirring for 20min at 200rpm, continuing stirring and mixing for 40min at 30 ℃ to obtain mixed slurry, placing the mixed slurry under a roll-to-roll machine, repeatedly rolling the mixed slurry into a sheet with the thickness of 1mm, and drying to obtain a flexible electrode;

(2) 100mL of acetonitrile was added 0.1g of CaH₂Stirring and refluxing the mixture for reaction for 12 hours at the temperature of 70 ℃ in an oil bath, and cooling the reaction product to normal temperature to prepare anhydrous acetonitrile; drying the flexible electrode at 80 deg.C for 0.5h in nitrogen atmosphere, cooling to room temperature in nitrogen atmosphere, and adding [ Hmim ]]Tf₂N ionic liquid and anhydrous acetonitrile, wherein the flexible electrode is immersed in the ionic liquid and the anhydrous acetonitrile, and the volume ratio of the ionic liquid to the anhydrous acetonitrile is 1: 10; stirring at 90 deg.C under reflux for 8 hr, cooling to room temperature under nitrogen atmosphere, filtering, washing with anhydrous acetonitrile, and drying at 100 deg.C for 12 hr;

the filter assembly prepared by the embodiment is used for filtering non-oily NaCl aerosol, the air flow is controlled to be (85 +/-2) L/min, the particle size is controlled to be (0.075 +/-0.020) mu m, and the aerosol filtering effect is detected; then testing the virus filtering effect by using a PK-174 mask Virus Filtering Efficiency (VFE) tester; the filtering efficiency of aerosol and virus is up to more than 99 percent; the filtered gas meets the standard that the particle filtering efficiency of the mask filter material of GB19083-2010 medical protective mask technical requirement is not less than 95%.

Example 2: the filtering component based on the ionic liquid and the micro-electric field comprises a button battery, a flexible conductive anode and a flexible conductive cathode, wherein the flexible conductive anode and the flexible conductive cathode are respectively connected with the button battery; the filtering component is applied to a conventional medical mask, and an intermediate filtering layer of the filtering component is replaced, so that the mask is sequentially provided with a waterproof layer, a flexible conductive cathode, a flexible conductive anode and a comfort layer from outside to inside, and the flexible conductive anode and the flexible conductive cathode are respectively connected with a button cell and fixed in the mask;

the preparation method of the flexible conductive anode or the flexible conductive cathode comprises the following steps:

(1) grinding graphite until the particle size is smaller than 200 meshes, placing the ground material into an ethanol solution with the mass concentration of 10%, stirring and mixing uniformly at 1200rpm, adding PTFE emulsion with the mass of 10% of the mixture and active alumina with the mass of 8% of the mixture, stirring for 10min at 1200rpm, continuing stirring and mixing for 30min at 70 ℃ to obtain mixed slurry, placing the mixed slurry under a roll-to-roll machine, repeatedly rolling the mixed slurry into sheets with the thickness of 1.5mm, and drying to obtain the flexible electrode;

(2) 100mL of acetonitrile was added 1g of CaH₂Stirring and refluxing the mixture for reaction for 10 hours at the temperature of 85 ℃ in an oil bath, and cooling the mixture to normal temperature to prepare anhydrous acetonitrile; drying the flexible electrode at 50 deg.C for 1 hr under nitrogen atmosphere, cooling to room temperature under nitrogen atmosphere, and adding [ Hmim ]]CuCl₂The flexible electrode is immersed in the ionic liquid and the anhydrous acetonitrile, and the volume ratio of the ionic liquid to the anhydrous acetonitrile is 1: 5; stirring at 90 deg.C under reflux for 8 hr, cooling to room temperature under nitrogen atmosphere, filtering, washing with anhydrous acetonitrile, and drying at 120 deg.C for 8 hr;

the filter assembly prepared by the embodiment is used for filtering non-oily NaCl aerosol, the air flow is controlled to be (85 +/-2) L/min, the particle size is controlled to be (0.075 +/-0.020) mu m, and the aerosol filtering effect is detected; then testing the virus filtering effect by using a PK-174 mask Virus Filtering Efficiency (VFE) tester; the filtering efficiency of aerosol and virus is up to more than 99 percent; the filtered gas meets the standard that the particle filtering efficiency of the mask filter material of GB19083-2010 medical protective mask technical requirement is not less than 95%.

Example 3: the filtering component based on the ionic liquid and the micro-electric field comprises a button battery, a flexible conductive anode and a flexible conductive cathode, wherein the flexible conductive anode and the flexible conductive cathode are respectively connected with the button battery;

the preparation method of the flexible conductive anode or the flexible conductive cathode comprises the following steps:

(1) grinding porous carbon to a particle size smaller than 200 meshes, placing the ground material in an ethanol solution with a mass concentration of 15%, stirring and mixing uniformly at 800rpm, adding a PTFE emulsion with a mass of 8% of the mixture and active alumina with a mass of 10% of the mixture, stirring for 15min at 800rpm, continuing stirring and mixing for 50min at 50 ℃ to obtain mixed slurry, placing the mixed slurry under a roll-to-roll machine, repeatedly rolling the mixed slurry into sheets with a thickness of 2mm, and drying to obtain the flexible electrode;

(2) 100mL of acetonitrile was added 0.5g of CaH₂Stirring and refluxing the mixture for reaction for 11 hours at the temperature of 80 ℃ in an oil bath, and cooling the mixture to normal temperature to prepare anhydrous acetonitrile; drying the flexible electrode at 60 ℃ for 1h in a nitrogen atmosphere; the temperature was lowered to room temperature under a nitrogen atmosphere, and [ Hmim ] was added]FeCl₄The flexible electrode is immersed in the ionic liquid and the anhydrous acetonitrile, and the volume ratio of the ionic liquid to the anhydrous acetonitrile is 1: 15; stirring at 85 deg.C under reflux for 10 hr, cooling to room temperature under nitrogen atmosphere, filtering, washing with anhydrous acetonitrile, and drying at 110 deg.C for 10 hr.

The ionic liquid modified porous electrode material and the button cell lead are sewn inside by two layers of dustproof and air-tight cloth, the ionic liquid modified porous electrode material connected with the negative electrode is arranged on the outer side, and the ionic liquid modified porous electrode material connected with the positive electrode is arranged on the inner side.

The filter assembly prepared by the embodiment is used for filtering non-oily NaCl aerosol, the air flow is controlled to be (85 +/-2) L/min, the particle size is controlled to be (0.075 +/-0.020) mu m, and the aerosol filtering effect is detected; then testing the virus filtering effect by using a PK-174 mask Virus Filtering Efficiency (VFE) tester; the filtering efficiency of aerosol and virus is up to more than 99 percent; the filtered gas meets the standard that the particle filtering efficiency of the mask filter material of GB19083-2010 medical protective mask technical requirement is not less than 95%.