A filter medium and corresponding electret protective article

Abstract

The present application provides a filter medium and a corresponding electret protective article, which can effectively maintain effective electret time and filtering effect, wherein the filter medium comprises: a medium body; and a ventilation and filtering unit for ventilation and protective filtering, wherein the medium body is formed by at least one film made of electret material being covered and stacked, the ventilation and filtering unit comprises at least one through hole, the through hole is arranged through the medium body, and the filter medium is subjected to protective filtering after being electreted.

Description

Technical Field

[0001] This invention relates to a filter medium and corresponding electret protection products. Background Technology

[0002] Currently, electret materials are commonly used to make electret filter media for filtering viruses, bacteria, or particulate matter. The common method is to obtain fibers from electret materials through melt-blowing, spunbonding, or thin-film re-splitting, and then electret the fibers to make filter media. However, the filter media obtained in this way has a difficult-to-maintain electret time due to the disordered accumulation of fibers. In addition, due to transportation and storage, it is difficult to maintain the electret electric field in the filter media obtained in practice, and therefore it is difficult to achieve the required filtration effect. Summary of the Invention

[0003] This invention provides a filter medium that can effectively maintain effective electret time and filtration effect, as well as corresponding electret protection products.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] One object of the present invention is to provide a filter medium, characterized in that it comprises: a medium body; and a ventilated filter unit for ventilating and protecting the filter, wherein the medium body is formed by covering and stacking at least one layer of thin film made of electret material, and the ventilated filter unit includes at least one through hole disposed through the medium body.

[0006] In one example of the filter medium of the present invention: wherein the electret material is a polymeric material with electret function.

[0007] Another object of the present invention is to provide electret protective equipment, characterized in that: a filter medium is used for both ventilation and protective filtration, wherein the filter medium is the aforementioned filter medium. In one example of the electret protective equipment of the present invention, the characteristic is that: the electret protective equipment is a mask, the mask having a mask body for isolating the wearer's mouth and nose from the outside environment, and a ventilation filter section for both ventilation and protective filtration, wherein the ventilation filter section is made of a filter medium, and the filter medium undergoes protective filtration after electret treatment.

[0008] In one example of the electret protective equipment of the present invention, the characteristic is that: the electret protective equipment is a mask, the mask having a mask body for isolating the wearer's mouth and nose from the outside world, and having, from the outside to the inside, the following layers in sequence: an outer layer; a filter layer, at least one layer, for ventilation and protective filtration; and an inner layer, wherein the filter layer is made of a filter medium.

[0009] In one example of the electret protective equipment of the present invention: wherein the electret protective equipment is a face mask, the face mask having a face mask body for isolating the wearer's face from the outside world, having a ventilation filter section for ventilation and protective filtration, wherein the ventilation filter section is made of a filter medium.

[0010] In one example of the electret protective equipment of the present invention: wherein the electret protective equipment is a face mask, the face mask having a face mask body for isolating the wearer's face from the outside world, the face mask body having, from the outside to the inside, the following layers in sequence: an outer layer; a filter layer, at least one layer, for ventilation and protective filtration; and an inner layer, wherein the filter layer is made of a filter medium.

[0011] In one example of the electret protective equipment of the present invention: the electret protective equipment includes a head protection part, the head protection part having: a head cap; and a face and nose protection area, the face and nose protection area being used to isolate the wearer's mouth and nose from the outside world, having a ventilation filter part, the ventilation filter part being used for ventilation and protective filtration, wherein the ventilation filter part is made of a filter medium.

[0012] In one example of the electret protective equipment of the present invention: the electret protective equipment includes a head protection part having: a head cap; and a face and nose protection area for isolating the wearer's mouth and nose from the outside world, the face and nose protection area having, from the outside to the inside, an outer layer; a filter layer, at least one layer, for ventilation and protective filtration; and an inner layer, wherein the filter layer is made of a filter medium.

[0013] In one example of the electret protective equipment of the present invention: the head protection portion further includes a face and eye protection area for isolating the wearer's eyes from the outside world. In another example of the electret protective equipment of the present invention: the face and eye protection area is also made of a filter medium, which is transparent.

[0014] In one example of the electret protective equipment of the present invention: the entire facial and oral cavity protection area is made of a filter medium, and the facial and eye protection area is integrally formed with the facial and oral cavity protection area. In another example of the electret protective equipment of the present invention: the electret protective equipment further includes a body-wearing part, which is used to isolate at least a part of the wearer's body from the outside world.

[0015] In one example of the electret protective equipment of the present invention, the equipment is characterized by further comprising: a monitoring device having: a CPU processing module for processing various received information to obtain various processed information; a data acquisition module for acquiring relevant information of health-related indicators and air quality-related indicators through corresponding data acquisition sensors and sending them to the CPU processing module for processing; a communication module for communication transmission between the various modules of the monitoring device and / or between the monitoring device and the outside world; and a power supply module for supplying power to the operation of the monitoring device.

[0016] In one example of the electret protective equipment of the present invention: health-related indicators include one or more of heart rate, blood pressure, body temperature and blood oxygen saturation, and air quality-related indicators include one or more of particulate matter, nitrogen, oxygen and nitrogen dioxide concentration.

[0017] In one example of the electret protective product of the present invention: the communication module transmits the processed information to the mobile terminal.

[0018] In one example of the electret protective equipment of the present invention: the communication module also transmits the processed information to the cloud via communication to store big data related to human health index and environmental health index, and the cloud performs one or both of the personal human health index and environmental health index based on the relevant big data.

[0019] Another object of the present invention is to provide a charging electret device, characterized in that it is used to electret the above-mentioned electret protective products.

[0020] According to the filter medium and corresponding electret protective products provided by the present invention, after electretting, since the electric field direction established by each layer of film is consistent and the same pole is uniformly on one side, the electric field of each layer of film can be established and is not easy to disappear. The multilayer film establishes a continuous and effective electric field channel, which can continuously and effectively adsorb and capture charged particles as they pass through the through holes, or allow uncharged particles to become charged and be effectively adsorbed and captured in the process, thereby achieving the function of electrostatic filtration and protection. The filtration effect of PM2.5 can reach 99%. Moreover, when the multilayer film is stacked to a certain thickness, the electric field can be maintained for a longer effective time, thus truly maintaining effective filtration for a longer period of time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the front structure of the filter medium involved in Example 1;

[0022] Figure 2 This is a side cross-sectional schematic diagram of the filter medium involved in Example 1;

[0023] Figure 3This is a schematic diagram of the electrode distribution of the filter medium after electret treatment in Example 1;

[0024] Figure 4 This is a schematic diagram of the structure of the mask involved in Example 2;

[0025] Figure 5 This is a side sectional view of another structure of the mask involved in Example 2;

[0026] Figure 6 This is a schematic diagram of the structure of the face mask involved in Example 3;

[0027] Figure 7 This is a block diagram of the component structure of the monitoring equipment for electret protective equipment involved in Example 5. Detailed Implementation

[0028] The specific embodiments of the present invention are described below.

[0029] Unless otherwise specified, the methods used in the following examples are conventional methods; the materials and reagents used are commercially available unless otherwise specified.

[0030] In the following examples, the outer side refers to the side away from the wearer's face when worn, and the inner side refers to the side close to the wearer's face when worn.

[0031] Example 1

[0032] The following examples are provided to illustrate the filter media involved in this invention.

[0033] Figure 1 This is a schematic diagram of the front structure of the filter medium involved in Example 1;

[0034] Figure 2 This is a side cross-sectional schematic diagram of the filter medium involved in Example 1.

[0035] like Figure 1 and Figure 2 As shown, the filter medium 1 provided in this embodiment includes a medium body 11 and an air filtration unit 12.

[0036] The dielectric body 11 is formed by covering and stacking at least one thin film 11a made of electret material. The electret material is a variety of materials with electret function, such as various inorganic electret materials and organic electret materials. Inorganic electret materials include oxides such as barium titanate (BaTiO3), lead zirconate titanate (PZT), zinc oxide (ZnO), tantalum oxide (Ta2O5), aluminum oxide (Al2O3), and titanium oxide (TiO2). Preferably, it is a polymer material, such as polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (PFA), perfluoroethylene propylene (Te flon-FEP), soluble polyethylene (PFA), polyvinylidene fluoride (PVDF), etc.

[0037] The ventilation filter unit 12 includes at least one through hole 12a. Figure 1 and Figure 2 The example only shows some through holes 12a). Through holes 12a are disposed on the dielectric body 11. The through holes 12a can be formed by drilling holes 12b at the same position in each thin film 11a, and then covering and stacking them to form the dielectric body 11, while the holes 12b at the same position are respectively connected to form each through hole 12a. Alternatively, after all the thin films 11a are covered and stacked to form the dielectric body 11, holes are drilled on the dielectric body 11 to form each through hole 12a.

[0038] As can be seen from the arrangement of each through hole 12a, each membrane 11a has a hole 12b, and the holes 12b at the same position are connected to form a through hole 12a, which is used for ventilation and protective filtration.

[0039] Figure 3 This is a schematic diagram of the two-electrode distribution of the filter medium after electret treatment, as described in Example 1.

[0040] Figure 3 To be Figure 2 A schematic diagram of the enlarged side section of a through-hole 12a is shown in the figure. The figure shows the distribution of the positive and negative poles of the electric field after the electret of each thin film 11a (+ represents the positive pole and - represents the negative pole in the figure). The dashed head is the stacking direction, which refers to the direction of gas inlet and outlet of the through-hole 12a. It can be either the gas inlet or gas outlet direction.

[0041] like Figure 3 As shown, when electretting the filter medium 1, electretting needs to be performed according to the stacking direction of the membrane 11a. In this way, each membrane 11a has two opposing positive and negative poles distributed along the air inlet or outlet direction of the through hole 12a. That is, there are two opposing positive and negative poles distributed at both ends of the hole 12b on each membrane 11a along the stacking direction, thereby forming a stable electrostatic field between the positive and negative poles. The multilayer membrane 11a establishes multiple such electric fields, which, through the setting of the through hole 12a, are equivalent to becoming a continuous effective electric field channel.

[0042] After electret treatment, the protective filtration of the through-hole 12a is achieved as follows: When particles pass through the holes 12b on the outermost membrane 11a in sequence from the outermost membrane 11a to the holes 12b on each layer of membrane 11a, the positive and negative electrodes distributed at both ends of each hole 12b sequentially adsorb the positively or negatively charged particles through electrostatic attraction. At the same time, uncharged particles are polarized and adsorbed. In this process, inertial collision, Brownian diffusion, and gravitational sedimentation are also involved to ultimately achieve the filtration of particles such as viruses, bacteria, or particulate matter.

[0043] In order to achieve effective protective filtration, the design of filter media 1 can be considered from the following aspects:

[0044] (1) To establish continuous positive and negative poles and thus form a continuous electrostatic field, the thickness of the thin film 11a needs to be moderate.

[0045] (2) The pore size of the through hole 12a and the number of through holes 12a distributed on the medium body with a square meter area (porosity) need to take into account the concentration, velocity, resistance, etc. of the particles to be filtered.

[0046] (2) The total thickness of the medium body 11 after the superposition of each layer of film 11a needs to take into account the pore size of the through hole 12a, the effective maintenance time of the electrostatic field, etc. If the above pore size is too large, the particles will pass through too fast. In order to ensure that the particles have sufficient adsorption and sedimentation time, the above total thickness needs to be increased accordingly. In order to maintain the electrostatic field effectively, the thickness also needs to be increased accordingly. However, the above total thickness should not be too thick, so that when it is used in protective equipment such as masks and face shields, it will not be too heavy or have too much breathing resistance.

[0047] In addition, the cross-sectional shape of the through hole 12a in this embodiment can be any shape, preferably a regular hexagon.

[0048] According to the filter medium 1 provided in this embodiment, after electret treatment, since the electric field direction established by each layer of film 11a is consistent and the same pole is uniformly on one side, it is not chaotic. In this way, the electric field of each layer of film 11a can be established and is not easy to disappear. The multilayer film 11a establishes a continuous and effective electric field channel, which can continuously and effectively adsorb and capture charged particles as they pass through the through hole 12a, or allow uncharged particles to become charged in the process and be effectively adsorbed and captured. Thus, it can effectively play the role of electrostatic filtration and protection, and the filtration effect of PM2.5 can reach 99%. Moreover, the multilayer film 11a is stacked to a certain thickness, which can maintain the electric field for a longer effective time, thus truly maintaining effective filtration for a longer period of time.

[0049] Example 2

[0050] In this embodiment, the same components as in Embodiment 1 are referred to by the same reference numerals, and the same descriptions as in the foregoing embodiments are omitted.

[0051] This embodiment provides an electret protective product that uses the filter medium of Embodiment 1 as the above-mentioned ventilation and protective filtration, and the electret protective product is a mask.

[0052] Figure 4 This is a structural schematic diagram of the mask involved in Example 2.

[0053] like Figure 4 As shown, in one structure of this embodiment, the mask 2 has a mask body 21, the shape of which is adapted to the part of the wearer's face that is in contact with the mask body when worn.

[0054] The mask body 21 is used to isolate the wearer's mouth and nose from the outside world. The mask body 21 has a ventilation filter 21a for ventilation and protective filtration, and the ventilation filter 21a is made of the filter medium in Example 1. Isolation from the outside world means that the mask body 21 can cover the front of the mouth and nose, so that the mouth and nose are not exposed to the outside world, and the ventilation filter 21a can meet the requirements of breathing resistance.

[0055] In addition, in this structure, as long as the above-mentioned breathing resistance requirements can be met: the ventilation filter 21a can be set at any position on the mask body 21; the ventilation filter 21a can also be any shape and size; or the entire mask body 21 can be made of the filter medium of Example 1, in which case the mask body 21 is the ventilation filter 21a.

[0056] Figure 5 This is a side sectional view of another structure of the mask involved in Example 2.

[0057] like Figure 5 As shown, in another structure of this embodiment, the mask 3 has a mask body 31, which is also used to isolate the wearer's mouth and nose from the outside. The mask body 31 has an outer layer 31a, a filter layer 31b and an inner layer 31c from the outside to the inside.

[0058] The filter layer 31b has at least one layer for ventilation and protective filtration, and is made of the filter medium in Example 1. In this embodiment, for ease of explanation, Figure 3 The filter layer 31b in the example is a single layer. The filter medium that makes the filter layer 31b is composed of two layers of thin film 11a stacked together. The holes 12b at the same position on each layer of thin film 11a are interconnected to form through holes 12a.

[0059] To facilitate use and replacement, the structure of the mask body 31 in this embodiment is designed to allow for the removal and replacement of the filter layer 31b. This design can be achieved using existing conventional technology and will not be described in detail in this embodiment.

[0060] In addition, this embodiment also provides a charging electret device, which is used in conjunction with the electret protective product provided in this embodiment, i.e., a mask, to electret the corresponding mask. Thus, when the electret protective product has been used for a certain period of time and the electric field may disappear, the charging electret device can be used to electret the mask 2 or mask 3, or it can be used only to electret the removed filter layer 31b. Furthermore, as can be seen from the above, electret electret must be performed according to the aforementioned layering direction.

[0061] Example 3

[0062] In this embodiment, the same components as in Embodiment 1 are referred to by the same reference numerals, and the same descriptions as in the foregoing embodiments are omitted.

[0063] This embodiment provides an electret protective product that uses the filter medium of Embodiment 1 as the above-mentioned ventilation and protective filtration, and the electret protective product is a face mask.

[0064] Figure 6 This is a structural schematic diagram of the face mask involved in Example 3.

[0065] like Figure 6 As shown, in one structure of this embodiment, the mask 4 has a mask body 41, and similarly, the shape of the mask body 41 is adapted to the place where it fits against the wearer's face when worn.

[0066] The mask body 41 is used to isolate the wearer's face from the outside world. The mask body 41 has a ventilation filter 41a for ventilation and protective filtration, and the ventilation filter 41a is made of the filter medium in Example 1. Isolation from the outside world means that the mask body 41 can cover the front of the wearer's face, so that the mouth, nose and eyes are not exposed to the outside world, and the ventilation filter 41a can meet the requirements of breathing resistance.

[0067] In addition, in this structure, as long as the above-mentioned breathing resistance requirements can be met, the ventilation filter 41a can be set at any position on the mask body 41; the ventilation filter 41a can also be any shape and size; and since the film used can be transparent, as long as a certain visual clarity can be guaranteed, the entire mask body 21 can also be made of the filter medium of Example 1, in which case the mask body 41 is the ventilation filter 41a.

[0068] In another structure of this embodiment, it is similar to another structure in embodiment 2. Figure 3The mask has a mask body for isolating the wearer's mouth and nose from the outside environment, and the mask body has an outer layer, a filter layer, and an inner layer in sequence from the outside to the inside. Similarly, the filter layer has at least one layer for ventilation and protective filtration, and is made of the filter medium in Example 1.

[0069] Similarly, in this embodiment, a charging electret device is also provided. This device is used in conjunction with the electret protective product provided in this embodiment, i.e., the face mask. The usage method is similar to that in Embodiment 2, and will not be repeated in this embodiment.

[0070] Example 4

[0071] In this embodiment, the same components as in Embodiment 1 are referred to by the same reference numerals, and the same descriptions as in the foregoing embodiments are omitted.

[0072] This embodiment provides an electret protective product that uses the filter medium of Embodiment 1 as the above-mentioned ventilation and protective filtration. The electret protective product includes a head protection part, which has a head cap and a face and nose protection area.

[0073] Headgear is used to isolate the wearer's head area, except for the face, from the outside world.

[0074] The face and nose protection zone is located on the front of the head protection section and is used to isolate the wearer's mouth and nose from the outside world.

[0075] In one embodiment, the facial and nasal protection area has a ventilation filter for ventilation and protective filtration, which is made of the filter medium described in Embodiment 1. Isolation from the outside world means that the facial and nasal protection area covers the front of the mouth and nose, preventing them from being exposed to the outside environment, and that the ventilation filter meets the requirements for breathing resistance.

[0076] In addition, in this structure, as long as the above-mentioned breathing resistance requirements can be met: the ventilation filter can be set at any position on the face, mouth and nose protection area; the ventilation filter can also be any shape and size; or the entire mask body can be made of the filter medium of Example 1, in which case the mask body is the ventilation filter.

[0077] In another structure of this embodiment, it is similar to another structure in embodiment 2. Figure 3 The facial and oral protection area has an outer layer, a filter layer, and an inner layer, arranged sequentially from the outside to the inside. Similarly, the filter layer has at least one layer for ventilation and protective filtration, and is made of the filter medium described in Example 1.

[0078] In addition, in this embodiment, the head protection part also has a facial eye protection area, which is used to isolate the wearer's eyes from the outside world. In this embodiment, the facial eye protection area is also made of the filter medium of Embodiment 1, and the filter medium is transparent so that the wearer can ensure a certain degree of visual clarity. When the entire facial mouth and nose protection area is made of filter medium, the facial eye protection area and the facial mouth and nose protection area can be integrally formed.

[0079] In addition, in this embodiment, the electret protective equipment also includes a body-wearing part, which is used to isolate at least part of the wearer's body from the outside world. That is, when the body-wearing part is the object of isolation: only the body part, or the body part and the upper limbs, or the body part and the lower limbs, or the body part and the limbs.

[0080] Similarly, in this embodiment, a charging electret device is also provided. This device is used in conjunction with the electret protective product provided in this embodiment, i.e., the face mask. The usage method is similar to that in Embodiment 2, and will not be repeated in this embodiment.

[0081] Example 5

[0082] In this embodiment, the same components as in the previous embodiments are referred to by the same reference numerals, and the same descriptions as in the previous embodiments are omitted.

[0083] This embodiment provides an electret protective product that uses the filter medium of Embodiment 1 as the above-mentioned ventilation and protective filtration. The electret protective product provided in this embodiment can be any of the electret protective products of Embodiments 1-4. The difference is that the electret protective product also includes a monitoring device.

[0084] Figure 7 This is a block diagram of the component structure of the monitoring equipment for electret protective equipment involved in Example 5.

[0085] like Figure 7 As shown, the monitoring device 5 has a CPU processing module 51, an acquisition module 52, a communication module 53, and a power supply module 54.

[0086] CPU processing module 51 is used to process various received information to obtain various processed information.

[0087] The data acquisition module 52 collects relevant information on health-related indicators and air quality-related indicators through corresponding sensors and sends them to the CPU processing module for processing to obtain the corresponding processed information. The health-related indicators include one or more of heart rate, blood pressure, body temperature, and blood oxygen saturation, while the air quality-related indicators include one or more of particulate matter, nitrogen, oxygen, and nitrogen dioxide concentrations. PPG (Photoplethysmograph) + ECG (Electrocardiograph) technology, combining photoelectric pulse wave monitoring technology and bioelectric potential monitoring technology, is used to monitor health-related indicators. The sensor chip for air quality-related indicators is built into electret protective clothing, positioned directly in front of the mouth and nose, to collect relevant information, thus achieving the monitoring of air quality-related indicators.

[0088] The sensors in the acquisition module 52 are set in appropriate positions according to the corresponding signals to be acquired.

[0089] The communication module 53 is used to communicate with external devices. For example, it can send the processed information obtained by the CPU to the mobile terminal 6 or other external devices for display, or receive relevant instructions or controls from the mobile terminal 6. The mobile terminal is, for example, a mobile phone, a computer or a tablet. The communication can be via Bluetooth, wired or wireless transmission.

[0090] The power module 54 is used to supply power to the monitoring equipment 5.

[0091] In this embodiment, the communication module 53 also transmits the processed information to the cloud 7, which stores big data related to human health index and environmental health index. The cloud performs one or both of the personal human health index and environmental health index analysis based on the relevant big data. Because it is based on the relevant big data, the analysis of health indicators or environmental indicators is more accurate.

[0092] Experimental Example

[0093] In this experimental example, the filter medium provided in Example 1 and the N95 meltblown fabric in the prior art were used to conduct electret and filtration experiments.

[0094] The filter medium provided in Example 1 is a PTEE membrane with a single-layer membrane thickness of 0.1 mm; the filtration effect is tested using PM2.5 as the test object, and the unit is particles / L; the test flow rate is in L / min; the electret voltage is in -V; see Table 1 for details.

[0095]

[0096]

[0097] Table 1 shows that:

[0098] 1. The voltage of the purchased N95 meltblown fabric was measured directly and found to be only -200V, with a filtration efficiency of less than 80%, indicating that electret masks on the market are unlikely to provide true filtration and protection.

[0099] 2. After 15 days of electret treatment, the voltage of the purchased N95 meltblown fabric decreased from -1500V to -250V, and the filtration efficiency also decreased from 95% at the time of electret treatment to below 80%. In contrast, the voltage of the filter medium provided by this invention after electret treatment is much lower than that of the purchased N95 meltblown fabric at the time of electret treatment, and it can still maintain electret treatment without decay after 15 days of storage, and can maintain filtration efficiency. This shows that the filter medium provided by this invention can maintain the electret effect for a longer time, and thus can maintain filtration efficiency for a long time after one electret treatment.

[0100] 3. The filter medium provided by this invention has a better filtration efficiency when its thickness is appropriately increased;

[0101] 4. The filter medium provided by the present invention, when the thickness is the same, can ensure a similar filtration effect at different test flow rates within a certain time after electretting and after electretting, while the existing technology has a large variation.

[0102] From the above, we can see that:

[0103] 1. Compared with the prior art, the filter medium provided by the present invention can maintain filtration efficiency for a long time. When used with a charging electret device, it can maintain the effective electrostatic protection filtration effect for a longer period of time after each electret.

[0104] 2. Compared with the prior art, the filter medium provided by the present invention has a much lower electret voltage, yet still achieves the same filtration effect.

[0105] 3. Compared with the prior art, the filtration effect of the filter medium provided by the present invention is less affected by the test flow rate, indicating that it is easier to meet the requirements of breathing resistance.

[0106] In summary, this experimental example demonstrates that the filter medium provided in Example 1 significantly increases the electret time and improves the filtration effect compared to existing technologies, making it more suitable for electret protection products.

[0107] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An electret protective article, characterized by, The electret protective article adopts a filter medium as a ventilation and protective filter, the filter medium comprises: a medium body; and a ventilation filter unit for ventilation and protective filtering, wherein the medium body is formed by laminating a film made of an electret material, and the electret material is a high polymer electret material The ventilation filter unit comprises at least one through hole provided on the medium body, and the filter medium is subjected to protective filtering after being electrified, The through hole is formed by individually punching each film at the same position of each layer, and then laminating the films to form the medium body, and each hole at the same position forms a through hole; or the through hole is formed by punching the medium body after laminating all the films to form the medium body. When electrifying the filter medium, the electrification is performed in the laminating direction of the films, and the holes in each film are distributed with opposite positive and negative poles at both ends in the laminating direction, an electrostatic field is formed between the positive and negative poles, a plurality of electrostatic fields are established by the plurality of films, and the through hole is configured to provide a continuous effective electric field channel.

2. The electret protective article according to claim 1, wherein: wherein the electret protective article is a mask, and the mask has a mask body, the mask body is used to isolate the mouth and nose of a wearer from the outside world, and has a ventilation filter part, the ventilation filter part is used for ventilation and protective filtering, and the ventilation filter part is made of the filter medium.

3. The electret protective article according to claim 1, wherein: wherein the electret protective article is a mask, and the mask has a mask body, the mask body is used to isolate the mouth and nose of a wearer from the outside world, and has, from the outside to the inside, in order: an outer layer; at least one filter layer used for ventilation and protective filtering; and an inner layer, and the filter layer is made of the filter medium.

4. The electret protective article according to claim 1, wherein: wherein the electret protective article is a face shield, and the face shield has a face shield body, the face shield body is used to isolate the face of a wearer from the outside world, and has a ventilation filter part, the ventilation filter part is used for ventilation and protective filtering, and the ventilation filter part is made of the filter medium.

5. The electret protective article according to claim 1, wherein: wherein, the electret protective article is a face shield, and the face shield has a face shield body, the face shield body is used to isolate the face of a wearer from the outside world, and the face shield body has, from the outside to the inside, in order: an outer layer; at least one filter layer used for ventilation and protective filtering; and an inner layer, and the filter layer is made of the filter medium.

6. The electret protective article according to claim 1, wherein: wherein the electret protective article comprises a head protection part, the head protection part has: a head cover; and a face and mouth and nose protection area used to isolate the mouth and nose of a wearer from the outside world, and having a ventilation filter part, the ventilation filter part is used for ventilation and protective filtering, and the ventilation filter part is made of the filter medium.

7. The electret protective article of claim 1, ​ The head protection part has: a head cap; and a face and mouth and nose protection area for isolating the mouth and nose of the wearer from the outside, the face and mouth and nose protection area has, from the outside to the inside, in sequence: an outer layer; a filtering layer, at least one, for the ventilation and protection filtering; and an inner layer, wherein the filtering layer is made of the filtering medium.

8. The electret protective article according to claim 6, wherein: the head protection part further has a face and eye protection area for isolating the eyes of the wearer from the outside. wherein 9. The electret protective article according to claim 8, wherein: the face and eye protection area is also made of the filtering medium, and the filtering medium is transparent. wherein, 10. The electret protective article according to claim 8, wherein: the face and mouth and nose protection area is made of the filtering medium as a whole, and the face and eye protection area is integrally formed with the face and mouth and nose protection area. wherein, 11. The electret protective article according to claim 1, wherein: the electret protective article further has a body wearing part for isolating at least a part of the body of the wearer from the outside. wherein Further comprising:

12. The electret protective article of claim 1, wherein, a monitoring device having: a CPU processing module for processing the received various information to obtain various processed information; a collection module for collecting the information related to the health-related indexes and the air quality-related indexes through corresponding collection sensors and sending the information to the CPU processing module for processing; a communication module for communicating with the outside; a power module for supplying power for the operation of the monitoring device.

13. The electret protective article according to claim 12, wherein: the health-related indexes include one or more of heart rate, blood pressure, body temperature, and blood oxygen saturation, and the air quality-related indexes include one or more of particulate matter, nitrogen, oxygen, and nitrogen dioxide concentration. wherein 14. The electret protective article according to claim 12, wherein: the communication module communicates the processed information to a mobile terminal. wherein 15. The electret protective article according to claim 12, wherein: the communication module communicates the processed information to a cloud end storing big data related to human health indexes and environmental health indexes, and the cloud end analyzes one or both of personal human health indexes and environmental health indexes based on the related big data. wherein ​

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