CN111728295A - Mask filter layer and preparation method and application thereof - Google Patents
Mask filter layer and preparation method and application thereof Download PDFInfo
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- CN111728295A CN111728295A CN202010522052.0A CN202010522052A CN111728295A CN 111728295 A CN111728295 A CN 111728295A CN 202010522052 A CN202010522052 A CN 202010522052A CN 111728295 A CN111728295 A CN 111728295A
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 59
- 239000004744 fabric Substances 0.000 claims abstract description 48
- 239000004750 melt-blown nonwoven Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000000576 coating method Methods 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 23
- 239000011347 resin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 8
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- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000002390 adhesive tape Substances 0.000 claims 1
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 17
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 241000700605 Viruses Species 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000001954 sterilising effect Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000645 desinfectant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 241000894006 Bacteria Species 0.000 description 1
- 208000025721 COVID-19 Diseases 0.000 description 1
- 241000711573 Coronaviridae Species 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/30—Antimicrobial, e.g. antibacterial
- A41D31/305—Antimicrobial, e.g. antibacterial using layered materials
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0011—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using non-woven fabrics
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/04—Properties of the materials having electrical or magnetic properties
- D06N2209/041—Conductive
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/06—Properties of the materials having thermal properties
- D06N2209/062—Conductive
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1671—Resistance to bacteria, mildew, mould, fungi
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/30—Filters
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Materials For Medical Uses (AREA)
Abstract
The invention discloses a mask filter layer and a preparation method and application thereof, and belongs to the technical field of protective articles. The mask filter layer sequentially comprises a melt-blown non-woven fabric, a conductive electrode and a conductive-heat-conducting film from bottom to top; the section of a three-layer structure formed by the melt-blown non-woven fabric, the conductive electrode and the conductive-heat-conducting film is I-shaped. Compared with the existing graphene mask, the improved flexible interdigital electrode is designed on the melt-blown non-woven fabric for the commercialized surgical mask, and a layer of water-based graphene ink with efficient electric conduction-thermal conductivity is coated on the improved flexible interdigital electrode. The electrified filter layer can realize sterilization and disinfection, can also recover the electrostatic adsorption capacity of the melt-blown non-woven fabric, and improves the filterability so as to realize the purpose of repeated use.
Description
Technical Field
The invention belongs to the technical field of protective articles, and particularly relates to a mask filter layer and a preparation method and application thereof.
Background
The outbreak of coronavirus in 2019 (COVID-19) was still widespread worldwide, being transmitted mainly through respiratory droplets. The mask can be effectively protected by wearing medical surgery or N95 mask, but the using time of a single mask cannot exceed 4 hours generally, which causes huge consumption of the mask, and the mask supply is in a shortage state at present. In such a case, it is a practical problem whether the sterilized mask can be reused. At present, most of the waste masks are incinerated, so that burden is brought to the environment.
Therefore, it is important to provide a method for sterilizing a mask while maintaining the filtering performance of the mask, so as to solve the problem of recycling the mask. The Stanford university professor of matter science and engineering system draws high and the U.S. 4c Air company team carries out different disinfection treatments to melt blown non-woven fabrics to different disinfection modes have been evaluated. The results show that: the filtering performance of the melt-blown non-woven fabric can be greatly reduced by cleaning with methods such as alcohol, disinfectant water or soapy water, and the mask sterilized by the methods cannot be effectively protected; the ultraviolet disinfection has the defects of low ultraviolet penetration and difficulty in completely killing viruses; they found that the filtration performance of the melt-blown nonwoven fabric is minimally affected by the high-temperature treatment at about 70 to 100 ℃ and the treatment capability for bacteria and viruses is high.
However, up to now, additional professional high-temperature sterilization equipment is required to achieve high-temperature treatment at around 70-100 ℃. Therefore, the surgical mask is convenient and rapid to self-disinfect by improving the structure of the surgical mask, and has important value on the repeated recycling of the mask.
Disclosure of Invention
Aiming at the defects of the existing mask disinfection method, the invention provides the mask filter layer with the improved structure, the filter layer can be electrified and heated for disinfection, viruses adhered to the filter layer and the surface of the mask can be killed, the aim of reusing the surgical mask is fulfilled, and the filtering performance of the mask can be improved.
In order to achieve the above object, the present invention adopts the following technical means:
a mask filter layer comprises a melt-blown non-woven fabric, a conductive electrode and a conductive-heat-conducting film from bottom to top in sequence;
the section of a three-layer structure formed by the melt-blown non-woven fabric, the conductive electrode and the conductive-heat-conducting film is I-shaped.
Further, when an external power supply is adopted to apply voltage to the two ends of the conductive electrode, heat is generated when current passes through the electrode and the conductive-heat conductive film, and the heat conducted by the conductive-heat conductive film generates high temperature, so that the mask is disinfected.
Furthermore, the conductive electrode is made of conductive cloth tape or conductive adhesive.
Furthermore, the conductive electrode is of an interdigital electrode type structure.
Further, the electric conduction-heat conduction film is prepared by coating water-based graphene heat conduction ink.
Further, the water-based graphene heat-conducting ink is prepared by mixing water-based modified resin and water-based special electric-conducting graphene.
Further, the weight ratio of the aqueous modified resin to the aqueous special conductive graphene is 5:2-5: 4.
Further, the coating amount of the water-based graphene heat-conducting ink is 0.012g/cm2-0.015g/cm2。
The preparation method of the mask filter layer comprises the following steps:
step 1, taking melt-blown non-woven fabric, and cutting according to the size of a mask;
and 4, coating the water-based graphene heat-conducting ink on the surface of the melt-blown non-woven fabric paved with the electric-conducting electrode, and drying to obtain the filter layer.
A mask comprises the mask filter layer.
Has the advantages that:
1. compared with the method of using alcohol, disinfectant fluid, ultraviolet rays and the like to disinfect the mask, the method is more effective and convenient.
2. The materials and the process involved in the invention are nontoxic, have low cost and can be produced in large scale.
3. The invention has low requirement on preparation equipment in the preparation process and simple preparation process.
4. Compared with the existing graphene mask, the improved flexible interdigital electrode is designed on the melt-blown non-woven fabric for the commercialized surgical mask, and a layer of water-based graphene ink with efficient electric conduction-thermal conductivity is coated on the improved flexible interdigital electrode. The electrified filter layer can realize sterilization and disinfection, can also recover the electrostatic adsorption capacity of the melt-blown non-woven fabric, and improves the filterability so as to realize the purpose of repeated use.
Drawings
Fig. 1 is a schematic view of the structure of the filtering layer of the mask of the present invention.
FIG. 2 is a schematic view of the interdigital electrode type structure employed in example 1.
Fig. 3 is a schematic view of the disinfection method of the mask filter layer according to the present invention.
Fig. 4 shows the temperature change results of the mask filter of example 1 at a voltage of 3V.
Fig. 5 is a thermal distribution diagram of the mask filter of example 1 after being energized for 30 minutes at a voltage of 3V.
FIG. 6 is a schematic view of the interdigital electrode type structure employed in example 2.
Fig. 7 is a thermal distribution diagram of the mask filter of example 2 after being energized for 30 minutes at a voltage of 3V.
Fig. 8 shows the effect of the water-based graphene thermal conductive ink mixed according to different ratios in example 3 on the prepared mask filter layer.
FIG. 9 is a graph showing the temperature change of the mask filter layer at different voltages in example 4.
Fig. 10 is a temperature change curve of the mask filter of example 5 at a voltage of 3V.
Detailed Description
The invention provides a mask filter layer with an improved structure, wherein the improved filter layer can be disinfected by electrifying and heating, and the improved structure can kill viruses adhered to the filter layer and the surface of a mask, so that the aim of reusing the surgical mask is fulfilled, and the filtering performance of the mask can be improved.
As shown in fig. 1, the filter layer includes a conductive electrode, a high-performance conductive-thermal conductive film and a melt-blown non-woven fabric, the conductive electrode is adhered to the surface of the melt-blown non-woven fabric through a reasonable structural design, and the high-performance thermal conductive graphene film is coated on the surface of the melt-blown non-woven fabric.
When in disinfection, an external direct-current voltage source applies voltage to the two ends of the conductive electrode, when current passes through the conductive electrode and the conductive-heat-conducting film, heat is generated, and the high-performance conductive-heat-conducting film conducts heat timely to enable the surface temperature to be distributed uniformly; the virus adhered to the filter layer and the surface of the mask can be killed by the high temperature generated by the electrothermal effect, so that the repeated use of the commercial surgical mask becomes possible.
The key point of the invention is that the electric heat is uniformly distributed, the local temperature is too high (120 ℃), the graphene film can be burnt through, and the local temperature is too low (50 ℃), and the disinfection effect is poor. It is therefore necessary that the entire heating plane is uniformly at a temperature of 70-100 c. In order to achieve the effect, the key technical links of the invention comprise: the conductivity of the flexible conductive electrode, the pattern of the flexible electrode, the proportion of the aqueous graphene, the coating amount of the graphene heat conduction layer and the voltage of a direct-current voltage source.
In order to make the filter layer flexible, a flexible conductive electrode such as a conductive cloth tape, a conductive adhesive, or the like is selected in the present invention.
The pattern of the flexible conductive electrode is based on the conductivity, which determines the current distribution and thus the uniformity of the electrical heat distribution. If the design is not reasonable, the local current is large, the temperature is high, and the graphene film is burnt through.
Furthermore, in order to avoid the occurrence of short circuit of the electrodes and ensure that the current is uniformly distributed on the surface of the melt-blown non-woven fabric, an interdigital electrode type structure is selected in one embodiment of the invention and is formed by splicing conductive cloth tapes (the resistivity: 0.015 omega. cm, the thickness: 0.1mm +/-0.01).
Fig. 2 shows an interdigital electrode structure according to an embodiment of the present invention, wherein the interdigital electrode has a semi-circular basic structure, two semi-circular openings are opposite to each other, a first interdigital is disposed at the middle of the arc of the first semi-circular structure, a second interdigital and a third interdigital are disposed at the middle of the arc of the second semi-circular structure, and the first interdigital, the second interdigital and the third interdigital are parallel, parallel and cross each other.
Fig. 3 shows an interdigital electrode structure according to another embodiment of the present invention, wherein the interdigital electrode structure has a semi-rectangular basic structure, two semi-rectangles have opposite openings, a first interdigital is disposed at a middle position of a bottom side of the first semi-rectangle, a second interdigital is disposed at a middle position of a bottom side of the second semi-rectangle, and the first interdigital and the second interdigital are parallel, parallel and mutually crossed.
In addition, in order to realize the electric conduction and the heat conduction performance simultaneously, the invention selects the aqueous modified resin and the aqueous special electric conduction grade graphene to be mixed according to a certain proportion to form the aqueous graphene electric conduction-heat conduction ink, and then the aqueous graphene electric conduction-heat conduction ink is coated on the surface of the melt-blown non-woven fabric to form the high-performance electric conduction-heat conduction film.
The waterborne modified resin is produced by Changzhou Hengfeng nanometer technology company, and the model is GM-347.
The water-based special conductive graphene is a graphene filter cake with the model of GM-Y produced by Changzhou Hengfeng nanometer technology company.
The proportion of the aqueous graphene affects the quality, flexibility and adhesion of a graphene film with a melt-blown non-woven fabric. The reasonable graphene ratio (5: 3) can ensure that a uniform graphene film is obtained. The coating amount of the graphene heat conduction film is also the key of uniform temperature distribution. The coating amount of the graphene conductive-heat-conducting film is too small (< 0.012 g/cm)2) The heat conduction effect is not good, and the heat will be mainly concentrated on the conductive electrode. And the air permeability of the whole filtering membrane is influenced by excessive coating amount of the graphene conductive-heat-conducting membrane. Uneven coating of the graphene conductive-heat conductive film can also cause uneven heat distributionAnd (4) homogenizing.
Preferably, the coating method may be: hand coating, coater, spin coating, spray coating, and the like.
In addition, when an external power supply is adopted to disinfect the filter layer, the voltage of the direct-current voltage source is reasonably selected on the basis of realizing uniform heating, and the temperature is between 70 and 100 ℃. Too high voltage (more than or equal to 4V) can cause too high heat and burn out the mask, and the voltage is not enough (less than 2V) and the heating temperature is not enough for disinfection and sterilization.
The invention also provides a preparation method of the mask filter layer, which comprises the following steps:
1. a commercial melt-blown nonwoven fabric for a surgical mask was cut to the size of the commercial mask.
2. And adhering the flexible conductive electrode on the surface of the melt-blown non-woven fabric according to a designed pattern. The uniform distribution of the broadband of the conductive electrode and the smooth pasting of the conductive electrode are required to be ensured so as to ensure that the current can uniformly pass through.
3. Mixing the aqueous modified resin and the aqueous special conductive graphene according to the weight ratio of 5:2 to 5:4, and stirring for more than 2 hours by using a magnetic stirrer to prepare uniform high-performance conductive-heat-conductive aqueous graphene ink.
4. Uniformly coating the water-based graphene ink obtained in the step 3 on the surface of the melt-blown non-woven fabric adhered with the electrode by using a coating machine, wherein the coating amount of the graphene ink is about 0.012g/cm2-0.015g/cm2。
5. Naturally drying to obtain the mask filter layer with self-disinfection function.
Finally, the surgical mask which can be self-sterilized and recycled can be obtained through the sewing process of the commercialized mask.
The mask disinfection method comprises the following steps: and respectively connecting two electrodes of the conductive electrode to the positive electrode and the negative electrode of the direct current voltage source, keeping the electrification for 10-30 minutes, and then disconnecting the power supply to finish the disinfection process.
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications or substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and scope of the invention. The experimental methods and reagents of the formulations not specified in the examples are in accordance with the conventional conditions in the art.
Example 1
The flexible conductive cloth tape was adhered to the surface of the melt-blown nonwoven fabric in accordance with the designed pattern (shown in fig. 2). The aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:3, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed. Then coating the mixed solution on the surface of melt-blown non-woven fabric (0.0126 g/cm) with flexible conductive electrode by coating machine2) And (6) naturally drying.
The two electrodes of the conductive electrode of the improved filter layer are respectively connected to the positive electrode and the negative electrode of a direct current voltage source, as shown in fig. 3, the voltage is 3V, and the power supply is disconnected after the filter layer is kept electrified for 30 minutes.
Fig. 4 is a graph of temperature versus time for the improved filter layer at 3V. It can be seen that the temperature of the modified filter layer can rise to above 70 ℃ within 2 minutes of energisation.
FIG. 5 is a surface thermal profile of the modified filter layer after 30 minutes of energization at 3V. It can be observed that the heating is relatively uniform.
Example 2
This example differs from example 1 in that: the conductive electrodes differ in structure.
The flexible conductive cloth tape is adhered to the surface of the melt-blown non-woven fabric according to the structure shown in fig. 6. The aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:3, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed. Then coating the mixed solution on the surface of melt-blown non-woven fabric (0.0126 g/cm) with flexible conductive electrode by coating machine2) And (6) naturally drying.
The two electrodes of the conductive electrode were connected to the positive and negative of a dc voltage source, respectively, at a voltage of 3V, and after maintaining the energization for 30 minutes, as shown in fig. 7, uneven heating was observed on the lower surface of the electrode structure.
Example 3
This example differs from example 1 in that: the weight ratio of the aqueous modified resin to the aqueous special conductive graphene in the aqueous graphene heat-conducting ink is different.
The flexible conductive cloth tape was adhered to the surface of the melt-blown nonwoven fabric in accordance with the designed pattern (shown in fig. 2).
Mixing water-based modified resin and water-based special conductive graphene into water-based graphene heat-conducting ink according to different proportions, wherein the specific scheme is as follows:
the first scheme is as follows: the aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:2, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed.
Scheme II: the aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:3, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed.
The third scheme is as follows: the aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:4, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed.
Coating the water-based graphene heat-conducting ink obtained by the three schemes on the surface of melt-blown non-woven fabric with a flexible conductive electrode (0.0126 g/cm) through a coating machine2) And (6) naturally drying. Wherein, the heat-conducting ink mixed in a ratio of 5:4 is very thick, and cannot be uniformly coated on the surface of the melt-blown non-woven fabric by utilizing a coating machine.
The two electrodes of the conductive electrode are respectively connected to the positive electrode and the negative electrode of a direct current voltage source, the voltage is 3V, and the electrification is kept for 10 minutes, and as shown in the attached figure 8, the heat conduction performance of the aqueous graphene heat conduction ink with the weight ratio of the aqueous modified resin to the aqueous special conductive graphene being 5:3 is better than that of the aqueous graphene heat conduction ink with the weight ratio being 5: 2.
Example 4
The flexible conductive cloth tape was adhered to the surface of the melt-blown nonwoven fabric in accordance with the designed pattern (shown in fig. 2). The aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:3, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed. Then will beThe mixed solution was applied to the surface of a melt-blown nonwoven fabric with a flexible conductive electrode (0.0126 g/cm) by a coater2) And (6) naturally drying.
Two electrodes of the conductive electrode are respectively connected to the positive electrode and the negative electrode of the direct current voltage source, different voltages are applied, and the temperature change conditions under different voltages are observed, and the result is shown in figure 9. To achieve a temperature between 70-100 c, a voltage of 3V is preferred.
Example 5
The flexible conductive cloth tape was adhered to the surface of the melt-blown nonwoven fabric in accordance with the designed pattern (shown in fig. 2). The aqueous modified resin and the aqueous special conductive graphene are mixed according to the weight ratio of 5:3, and are stirred for more than 2 hours by using a magnetic stirrer to be uniformly mixed. The mixed solution was then applied to the surface of a melt-blown nonwoven fabric (0.009 g/cm) with a flexible conductive electrode by a coater2) And (6) naturally drying.
And respectively connecting the two poles of the conductive electrode to the positive pole and the negative pole of a direct current voltage source, keeping the voltage at 3V, and switching off the power supply after keeping the power on for 10-30 minutes.
FIG. 10 is a temperature rise curve of the filter layer of the present embodiment under 3V voltage, and it can be seen from the graph that the coating amount of the graphene thermal conductive film is too small (< 0.012 g/cm)2) So that the heat conduction effect is not good enough to achieve the purpose of sterilization and disinfection.
Claims (10)
1. A mask filter layer, its characterized in that: the filtering layer is sequentially provided with a melt-blown non-woven fabric, a conductive electrode and a conductive-heat-conducting film from bottom to top;
the section of a three-layer structure formed by the melt-blown non-woven fabric, the conductive electrode and the conductive-heat-conducting film is I-shaped.
2. The mask filter according to claim 1, characterized in that: when an external power supply is adopted to apply voltage to the two ends of the conductive electrode, heat is generated when current passes through the electrode and the conductive-heat conductive film, and the heat conducted by the conductive-heat conductive film generates high temperature, so that the mask is disinfected.
3. The mask filter according to claim 1, characterized in that: the conductive electrode is made of conductive cloth adhesive tape or conductive adhesive.
4. The mask filter according to claim 3, characterized in that: the conductive electrode is of an interdigital electrode type structure.
5. The mask filter according to claim 1, characterized in that: the electric conduction-heat conduction film is prepared by coating water-based graphene heat conduction ink.
6. The mask filter according to claim 5, characterized in that: the water-based graphene heat-conducting ink is prepared by mixing water-based modified resin and water-based special electric-conducting graphene.
7. The mask filter according to claim 6, characterized in that: the weight ratio of the waterborne modified resin to the waterborne special conductive graphene is 5:2-5: 4.
8. The mask filter according to claim 5, characterized in that: the coating amount of the water-based graphene heat-conducting ink is 0.012g/cm2-0.015g/cm2。
9. The method for preparing a filter for a mask according to claim 1, wherein the method comprises the steps of: the method comprises the following steps:
step 1, taking melt-blown non-woven fabric for later use;
step 2, laying a conductive electrode on the surface of the melt-blown non-woven fabric;
step 3, mixing the aqueous modified resin and the aqueous special conductive graphene to prepare aqueous graphene heat-conducting ink;
and 4, coating the water-based graphene heat-conducting ink on the surface of the melt-blown non-woven fabric paved with the electric-conducting electrode, and drying to obtain the filter layer.
10. A mask comprising the filter of claim 1.
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Application publication date: 20201002 |