CN215976304U - Wet film, humidifier and air treatment device - Google Patents
Wet film, humidifier and air treatment device Download PDFInfo
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- CN215976304U CN215976304U CN202121777551.0U CN202121777551U CN215976304U CN 215976304 U CN215976304 U CN 215976304U CN 202121777551 U CN202121777551 U CN 202121777551U CN 215976304 U CN215976304 U CN 215976304U
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Abstract
The utility model provides a wet film,Humidifier, air treatment facilities. Wherein the wet film comprises non-woven fabric, PAN nano fiber layer and SiO2A nanoparticle layer, the PAN nanofiber layer being disposed on one side surface of the nonwoven fabric; the SiO2A nanoparticle layer disposed on a surface of the PAN nanofiber layer; wherein the PAN nanofiber layer is positioned between the non-woven fabric and the SiO2Between the nanoparticle layers. The technical scheme of the utility model is that a non-woven fabric material is adopted as a base material of a humidifying membrane material to be compounded with a PAN nano-fiber layer. Based on the better hydrophilic performance of the PAN nano-fiber, the PAN nano-fiber is deposited on the surface of a base material, and then hydrophilic nano-SiO is deposited2The particles are loaded on the surface of the PAN nanofiber membrane, so that different roughness gradients are constructed, and the hydrophilic performance of the material is further improved. Therefore, the composite wet film has higher water absorption performance and humidification quantity.
Description
Technical Field
The utility model relates to the technical field of materials, in particular to a wet film, a humidifier and an air treatment device.
Background
Common humidification film materials in the current market are mainly PET/viscose blended spunlace nonwoven fabrics, are applied to a downdraft type wet film humidifier, and distribute water by utilizing the water absorption performance of the materials. Wherein, the viscose fiber is used as a water absorbing component, and the PET fiber is used as a supporting component.
However, the current wet film has uneven moisture distribution, the upper part of the wet film cannot absorb moisture, the humidifying performance is more dependent on the water absorption performance of the humidifying film material, the water absorption height is low, the water absorption speed is slow, and the humidifying performance is poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wet film, and aims to solve the problem of poor humidifying performance of the wet film in the prior art.
In order to solve the above problems, the present invention provides a wet film comprising:
a non-woven fabric;
a PAN nanofiber layer disposed on one side surface of the nonwoven fabric;
SiO2a nanoparticle layer disposed on a surface of the PAN nanofiber layer;
wherein the PAN nanofiber layer is positioned between the non-woven fabric and the SiO2Between the nanoparticle layers.
In one embodiment, the non-woven fabric is prepared by blending PET fibers and viscose fibers.
In one embodiment, the PAN nanofiber layer is formed on the surface of the nonwoven fabric by an electrospinning process.
In one embodiment, the SiO2A nanoparticle layer is formed on the surface of the PAN nanofiber layer by an electrostatic spray process.
In one embodiment, the PAN nanofiber layer and the SiO2The loading ratio of the nanoparticle layer was: PAN/SiO with ratio of 1/3.5 to less than or equal to2≤1/1。
In one embodiment, the PAN nanofibers have a diameter in the range of 0.1 μm to 0.7 μm.
In one embodiment, SiO2The particle size range of the microspheres is 1.0-30 μm.
In one embodiment, the wet film has a thickness of 0.02mm to 0.12 mm.
In one embodiment, the wet film is arranged in a zigzag shape.
In one embodiment, the wet film has a tooth height of 20mm to 40 mm.
In one embodiment, the interdental space of the wet film is 3mm to 8 mm.
The application also provides a humidifier, which comprises a bracket and a wet film, wherein the wet film comprises non-woven fabric, a PAN nano fiber layer and SiO2A nanoparticle layer, the PAN nanofiber layer being disposed on one side surface of the nonwoven fabric; the SiO2A nanoparticle layer disposed on a surface of the PAN nanofiber layer; wherein the PAN nanofiber layer is positioned between the non-woven fabric and the SiO2Between the nanoparticle layers; the wet film is mounted on the bracket.
The present application further provides an air treatment device comprising a humidifier comprising a support and a wet film comprising a nonwoven fabric, a PAN nanofiber layer, and SiO2A nanoparticle layer, the PAN nanofiber layer being disposed on one side surface of the nonwoven fabric; the SiO2A nanoparticle layer disposed on a surface of the PAN nanofiber layer; wherein the PAN nanofiber layer is positioned between the non-woven fabric and the SiO2Between the nanoparticle layers; the wet film is mounted on the supportAnd (4) putting on a shelf.
The technical scheme of the utility model is that a non-woven fabric material is adopted as a base material of a humidifying membrane material to be compounded with a PAN nano-fiber layer. Based on the fact that the PAN nanofiber has good hydrophilic performance, the PAN nanofiber is deposited on the surface of a base material, and then hydrophilic nano SiO2 particles are loaded on the surface of the PAN nanofiber membrane, so that different roughness gradients are constructed, and the hydrophilic performance of the material is further improved. Therefore, the composite wet film has higher water absorption performance and humidification quantity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of a composite wet film according to the present invention;
FIG. 2 is a schematic view of humidification of a humidification screen;
FIG. 3 is a top view of the wet film of FIG. 2, wherein the wet film is a zigzag humidification cartridge;
FIG. 4 is an SEM electron micrograph of CA nanofibers, wherein the CA fibers with uniform diameters are formed on a polyester/viscose blended spunlace nonwoven substrate, and the diameters are 0.5-0.6 μm.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
101 | |
| 102 | |
103 | SiO2Nanoparticle layer |
| 20 | |
200 | |
| 210 | |
220 | |
| 300 | |
21 | Inter-tooth space |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The conventional wet film is generally made of PET/viscose blended spunlace nonwoven fabric, the distribution of the nonwoven fabric is uneven, and when the wet film is used on a humidifying device (the wet film is vertically placed, the lower end of the wet film is soaked in a water tank), the upper part of the wet film absorbs less water or the time for absorbing the water is extremely long, and the water absorption rate is slow, so that the humidifying effect is influenced. When the air treatment device is wet in the humidification mode, the moisture absorbed by the wet film is less, so that the air can take away less moisture when passing through the wet film; in addition, after moisture on the wet film is taken away by air, the self water absorption time of the wet film is long, and the taken moisture cannot be absorbed from the water tank by the wet film in time, so that the humidification effect is seriously hindered.
Referring to fig. 1, the present application relates to a composite wet film 100 comprising a nonwoven fabric 101, a PAN nanofiber layer 102 (PAN: polyacrylonitrile containing silver nanoparticles), and SiO2 A nanoparticle layer 103, the PAN nanofiber layer 102 being provided on one side surface of the nonwoven fabric 101; the SiO2 A nanoparticle layer 103 is disposed on the surface of the PAN nanofiber layer 102. Wherein the PAN nanofiber layer 102 is positioned between the nonwoven fabric 101 and the SiO2Between the nanoparticle layers 103.
Here, the nonwoven fabric 101 is a woven fabric formed without spinning a woven fabric, and is formed by forming a web structure by orienting or randomly arranging spun short fibers or filaments and then reinforcing them by mechanical, thermal bonding, chemical or other methods. It directly uses high polymer slice, short fiber or filament to form a novel fiber product with soft, air-permeable and plane structure through various fiber web forming methods and consolidation techniques. In brief, the nonwoven fabric 101 is not formed by interweaving and knitting yarns one by one, but by directly bonding fibers by physical means.
The composite wet film 100 is made of three layers (non-woven fabric 101, PAN nanofiber layer 102, SiO)2Nanoparticle layer 103), the connection relationship between the three layers is not limited, for example, the nonwoven fabric 101 and the PAN nanofiber layer 102 are bonded together by using an adhesive, or are sewn or hot-pressed together; PAN nanofiber layer 102 and SiO2The nanoparticle layers 103 may also be bonded together using an adhesive, or stitched, or thermoformed together.
The main material of the composite wet film 100 is non-woven fabric, PAN nanofiber and SiO2The nano particles are raw material systems with mature processes, and the requirements of high cost and high equipment are not involved.
Composite wet film 100 with PAN nanofibers and SiO2Nanoparticles forming a layer with super-hydrophilic propertiesThe microsphere layer/nanofiber membrane can obviously improve the water absorption speed. In addition, the water absorption performance of the PET/viscose non-woven fabric 101 is effectively improved by means of the water absorption capacity of the super-hydrophilic microsphere layer/nanofiber membrane.
The technical scheme of the utility model is that a non-woven fabric 101 is adopted as a base material of the humidifying membrane 100 material to be compounded with the PAN nano-fiber layer 102. Based on the better hydrophilic performance of the PAN nano-fiber, the PAN nano-fiber is deposited on the surface of a base material, and then hydrophilic nano-SiO is deposited2The particles are loaded on the surface of the PAN nanofiber membrane, so that different roughness gradients are constructed, and the hydrophilic performance of the material is further improved. So that the composite type wet film 100 of the present invention has high water absorption performance and humidification amount.
There are many types of nonwoven fabrics 101, for example, spunlace nonwoven fabrics, needle-punched nonwoven fabrics, heat-seal nonwoven fabrics, spunbonded meltblown nonwoven fabrics, stitch-bonded nonwoven fabrics, and the like. In consideration of water absorption performance and air permeability, the spun-laced non-woven fabric is prepared by blending PET fibers and viscose fibers.
In the above embodiments, there are various connection relationships between the PAN nanofiber layer 102 and the nonwoven fabric 101, and in this embodiment, in order to make the connection between the PAN nanofiber layer 102 and the nonwoven fabric 101 more secure and not affect the performance of the two, the PAN nanofiber layer 102 is formed on the surface of the nonwoven fabric 101 by an electrospinning process.
It should be noted that electrospinning, i.e. electrostatic spinning, is mainly to charge and deform a polymer solution or melt by means of a high voltage electrostatic field, forming a suspended conical droplet at the tip of a spray head. When the charge repulsion force of the surface of the liquid drop exceeds the surface tension force, the liquid drop surface can eject polymer tiny liquid drop flow, called jet flow for short; these jets undergo high speed stretching by an electric field, solvent evaporation and solidification over a short distance and are finally deposited on a receiver.
In the electrospinning process, the spray device is filled with a charged polymer solution or melt. Under the action of an external electric field, the polymer liquid drops which are kept at the nozzle under the action of surface tension accumulate charges on the lower surface under the induction of the electric field and are subjected to an electric field force opposite to the direction of the surface tension. When the electric field is gradually increased, the droplet at the nozzle is elongated from a spherical shape into a conical shape, forming a so-called taylor cone. When the electric field strength increases to a critical value, the electric field force overcomes the surface tension of the liquid and is ejected from the Taylor cone. The jet flow vibrates and is unstable under the action of a high electric field, and irregular spiral motion with extremely high frequency is generated. In the high-speed oscillation, the jet flow is rapidly attenuated, and the solvent is rapidly volatilized, so that fibers with the diameter of nanometer scale are finally formed and scattered on the non-woven fabric 101 in a random manner to form polymer fibers.
After the PAN nanofiber layer 102 is formed on the surface of the nonwoven fabric 101 by an electrospinning process, the SiO layer2 A nanoparticle layer 103 is formed on the surface of the PAN nanofiber layer 102 by an electrostatic spray process.
Here, SiO2Adding of (2) to PAN/SiO2The surface appearance of the composite nanofiber is obviously changed, and SiO appears on the surface of the nanofiber2Particles of SiO2The particles can form a microsphere layer/nanofiber membrane with super-hydrophilic property, so that the water absorption speed is obviously improved.
The specific manufacturing process method for the composite wet film 100 is as follows:
a. preparing PAN/DMF electrostatic spinning solution.
b. And (3) depositing the PAN/DMF electrostatic spinning stock solution on the surface of the non-woven fabric 101 through an electrospinning process, and drying to obtain the composite membrane.
c. Configuration of PAN/SiO2DMF spinning solution.
d. The PAN/SiO is prepared by an electrostatic spraying process2And electrically spraying DMF spinning solution on the surface of the PAN nanofiber layer 102 of the composite membrane, and drying.
In the step a, the configured concentration of the electrospinning raw liquid is 5-12 wt% (e.g. 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%), and then the configured electrospinning raw liquid is injected into a needle cylinder of the electrospinning device.
In step b, parameters such as perfusion speed, working voltage, receiving distance, roller rotating speed, sliding table, temperature and humidity are adjusted. And (4) after electrospinning for different time, taking down the composite membrane on the roller, and putting the composite membrane into a vacuum oven for drying.
The specific parameters of the spinning equipment in the experiment are as follows: the perfusion speed is 0.5-2 mL/h, the voltage is 15-50 kV, the receiving distance is 18-36 cm, the rotating speed of the roller is 38-63 rpm, and the sliding table is 7-10 cm/80; the temperature is 25 +/-2 ℃ and the humidity is 45 +/-5%. And (3) after electrospinning for different times, obtaining a composite membrane with the PAN loading amount of 0-1.0 mL/cm, and drying the composite membrane in a vacuum oven at 80 ℃ for 3 hours. Here, the PAN loading is not preferably too large, because too large a PAN loading would increase the fiber diameter in the PAN fiber layer 102, and although the water absorption rate may be increased, at the same time, the wind resistance is also increased, so the PAN loading is set to be 0 to 1.0 mL/cm.
In step c, preparing 1-5 wt% PAN/SiO solution2The composite membrane obtained in the previous step was used as a base fabric by injecting a DMF spinning solution (e.g., 2 wt%, 3 wt%, 4 wt%) into a cylinder of an electrospinning device. Wherein, SiO2In the PAN/SiO2The proportion of DMF spinning solution is 4-8 wt%. With SiO2Increase in the amount of SiO2The agglomeration of particles is becoming more and more severe, SiO2The particle size increases, blocking a portion of the capillary wicking channels, and instead gradually decreasing the rate of water absorption by the wet film 100.
Here, the SiO is defined2In PAN/SiO2The ratio of DMF spinning solution is determined if SiO is used2If the ratio of (A) to (B) is too small, the subsequent electrospray efficiency will be low, and SiO2The adhesion effect is also poor; if SiO2Is higher than the ratio of (A), then in the subsequent electrospray process, SiO2The load rate will be faster and difficult to control.
In step d, the parameters of the electrospray device in the experiment are as follows: the perfusion speed is 0.5-2 mL/h, the voltage is 15-50 kV, the receiving distance is 18-36 cm, the rotating speed of the roller is 38-63 rpm, and the sliding table is 7-10 cm/80; the temperature is 25 +/-2 ℃ and the humidity is 45 +/-5%. After electrospinning for different times, the obtained PAN load is 0-1.0And (3) putting the mL/cm composite membrane into a vacuum oven to dry for 3 hours at the temperature of 80 ℃. Here, SiO of the composite film2The load is limited within the range of 0-1.0 mL/cm, and SiO is also considered2Agglomeration of the particles.
In one embodiment, the PAN nanofiber layer 102 and the SiO2The loading ratio of the nanoparticle layer 103 is: PAN/SiO with ratio of 1/3.5 to less than or equal to21/1, the specific cause analysis will be illustrated in the subsequent experimental data.
SiO2Adding of (2) to PAN/SiO2The surface appearance of the composite nanofiber is obviously changed, and the surface of the nanofiber has agglomerated SiO2Particles and with SiO2The agglomeration phenomenon becomes more and more serious as the loading capacity increases, SiO2The particle size is increased along with the increase of the capillary tube, and partial capillary wicking pore canals are blocked, so that the water absorption speed is increased and then reduced; with SiO2The fiber diameter is increased along with the increase of the loading amount, so that the thickness of the composite fiber layer is increased, the water absorption rate and the wind resistance are increased along with the increase of the loading amount, and the humidification amount tends to be increased and then reduced.
To test the correlation of the manufacturing process of the composite wet film 100 with its overall performance, the experiment was as follows:
according to different PAN/SiO2The embodiment of the utility model provides non-woven fabrics 101/electrospun PAN-SiO with different thicknesses2The fibrous membrane is compounded with the humidifying membrane 100 material. As shown in FIG. 2, the composite humidifying membrane 100 is folded to form a zigzag humidifying filter element with a zigzag height H1The width of the humidification filter element is 30mm, the space between teeth 21 is 5mm, the sawtooth-shaped humidification filter element is vertically placed on the water tank 300 (the placing mode is shown in fig. 3), the humidification filter element absorbs water from the water tank 300, air enters from the air inlet 210 and vertically passes through the humidification filter element, the humidification filter element composite membrane is arranged on the windward side, the base material is arranged on the leeward side, and water vapor is blown out from the air outlet 220 after passing through the composite membrane and the base material.
And (3) performance testing:
the water absorption rates, wind resistances and humidities of examples 1 to 6 were measured as follows:
and (3) testing the water absorption speed: reference is made to GB/T21655.1-2008.
Water absorption test: reference is made to GB/T21655.1-2008.
Wind resistance: refer to GB/T14295-2008.
And (3) humidification quantity test: see GB/T23332-.
And (3) testing results:
referring to fig. 4, (a) is an electron microscope image of the PET/viscose nonwoven 101, from which it can be seen that the material is prepared by blending cylindrical PET fibers and viscose fibers with grooves on the surface.
(b) Is SEM electron microscope image of PAN nano fiber deposited on non-woven fabric 101 base material by electrostatic spinning technology, and can be seen that PAN nano fiber has fine diameter, uniform distribution, good fiber appearance and diameter of 0.4-0.5 μm.
(c) Is prepared by electrostatic spraying hydrophilic SiO2Electrically spraying nano particles onto PAN nano fiber membrane to construct multi-stage nano SiO2The particle microsphere layer has a particle size of 16-20 μm.
(d) Is a cross-sectional electron microscope image of the composite humidifying membrane 100, we can clearly see the three-layer structure of the composite membrane, the uppermost layer is SiO2Nano particles, wherein the middle layer is a PAN nano fiber layer 102, and the lowest layer is a spunlace non-woven fabric 101; PAN/SiO2The composite membrane thickness is about 0.08 mm.
As can be seen from examples 1 to 6, the water absorption rate is clearly higher than that of the comparative example, the water absorption is higher than that of the comparative example, and the water absorption is also clearly higher than that of the comparative example when a proper amount is added, but the wind resistance is higher than that of the comparative example (especially, examples 5 and 6).
However, in example 7, the situation changed when PAN/SiO negative was used2The loading ratio is 1/4, the diameter of the PAN fiber reaches 0.7-0.8, and the SiO content is2When the particle diameter is 31 to 35 μm and the thickness of the composite film is 0.15mm, although the water absorption rate increases, the water absorption rate decreases for the first time, and the amount of humidification decreases significantly (compared to the actual thickness)For example 6).
Reason analysis: for PAN/SiO2Loading ratio, PAN fiber diameter, SiO2The parameter change is large because of four factors of the diameter of the grain diameter and the thickness of the composite film, namely PAN/SiO2Loading ratio, SiO2The particle diameter and the composite film thickness (of course, the PAN fiber diameter also has an influence, but the PAN fiber diameter does not change much and the influence is small), and thus, the PAN/SiO can be preliminarily determined2The loading ratio is not lower than 1/4, the PAN fiber diameter is not higher than 0.7 mu m, and SiO2The diameter of the grain diameter is not higher than 30 μm, and the thickness of the composite membrane is not higher than 0.15 mm. In examples 1 to 6, the PAN nanofibers ranged in diameter from 0.1 μm to 0.7 μm; SiO22The particle size range of the microspheres is 1.0-30 μm; the thickness of the wet film 100 is 0.02mm to 0.12 mm; are preferred embodiments.
In addition, the wet film 100 is provided in a zigzag shape, so that its contact area with air can be enlarged, and thus the water absorption rate and the amount of humidification can be increased. The tooth height of the wet film 100 should not be too large, and should not be too small, and too large will cause the whole wet film 100 to occupy too large thickness space, and too small will influence the humidification effect of the wet film 100. In this embodiment, the tooth height of the wet film 100 is 20mm to 40 mm.
The inter-tooth space 21 of the wet film 100 is also appropriately limited, and if it is too large, it is equivalent to decrease the contact area of the wet film 100 with air, and if it is too small, it will increase the wind resistance of the wet film 100. In view of this, in the present embodiment, the interdental space 21 of the wet film 100 is 3mm to 8 mm.
In addition, the present invention provides a humidifier 20, the humidifier 20 including a support on which the wet film 100 is mounted. The wet film 100 itself may be configured in a flat plate state, a cylindrical shape, or an arc shape, and the bracket may be adaptively selected depending on the specific configuration of the wet film 100.
Referring to fig. 3, the present invention further provides an air treatment device, in which the humidifier 20 is installed. Here, the air treatment device may be an air conditioner, a humidifying device, or a fan.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A wet film, comprising:
a non-woven fabric;
a PAN nanofiber layer disposed on one side surface of the nonwoven fabric;
SiO2a nanoparticle layer disposed on a surface of the PAN nanofiber layer;
wherein the PAN nanofiber layer is positioned between the non-woven fabric and the SiO2Between the nanoparticle layers.
2. The wet film of claim 1, wherein the PAN nanofiber layer is formed on the surface of the nonwoven fabric by an electrospinning process.
3. The wet film of claim 1, wherein the SiO is2A nanoparticle layer is formed on the surface of the PAN nanofiber layer by an electrostatic spray process.
4. The wet film according to any of claims 1 to 3, wherein the fiber diameter of the PAN nanofiber layer ranges from 0.1 μm to 0.7 μm; and/or
The SiO2SiO of the nanoparticle layer2The particle size range of the microspheres is 1.0-30 μm; and/or
The thickness of the wet film is 0.02 mm-0.12 mm.
5. The wet film of any one of claims 1 to 3, wherein the wet film is in a zig-zag configuration.
6. The wet film of claim 5, wherein the wet film has a tooth height of 20mm to 40 mm.
7. The wet film of claim 5, wherein the inter-tooth spacing of the wet film is from 3mm to 8 mm.
8. A humidifier comprising a support and a wet film according to any one of claims 1 to 7 mounted on said support.
9. An air treatment device comprising the humidifier of claim 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008849A (en) * | 2022-06-15 | 2022-09-06 | 东华大学 | Non-woven material-based self-bonding and self-reinforcing multi-stage structure micro-nano composite film and preparation method thereof |
| CN115538181A (en) * | 2022-11-04 | 2022-12-30 | 广东省美净滤清器有限公司 | Efficient fade-resistant electret filter material for dust removal and preparation method thereof |
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2021
- 2021-07-30 CN CN202121777551.0U patent/CN215976304U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008849A (en) * | 2022-06-15 | 2022-09-06 | 东华大学 | Non-woven material-based self-bonding and self-reinforcing multi-stage structure micro-nano composite film and preparation method thereof |
| CN115538181A (en) * | 2022-11-04 | 2022-12-30 | 广东省美净滤清器有限公司 | Efficient fade-resistant electret filter material for dust removal and preparation method thereof |
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