Polytetrafluoroethylene antibacterial filtering membrane

Abstract

The utility model discloses a polytetrafluoroethylene antibacterial filter membrane which comprises a polytetrafluoroethylene ultrafiltration layer (1), an antibacterial layer (2), a polytetrafluoroethylene microfiltration layer (3), an activated carbon filter layer (4) and a polytetrafluoroethylene primary filter layer (5) which are sequentially distributed, and the polytetrafluoroethylene primary filter layer (5) and the polytetrafluoroethylene microfiltration layer (3) are membrane layers subjected to ozone corona treatment. Membrane holes of the polytetrafluoroethylene primary filtration layer (5) and the polytetrafluoroethylene microfiltration layer (3) are circular-truncated-cone-shaped holes, the small hole diameter of the circular-truncated-cone-shaped holes of the polytetrafluoroethylene primary filtration layer (5) faces the inlet side, and the small hole diameter of the circular-truncated-cone-shaped holes of the polytetrafluoroethylene microfiltration layer (3) faces the outlet side. The filter has the characteristics of good adsorption and antibacterial effects and high filtering efficiency.

Description

Technical Field

[0001] The utility model relates to a polytetrafluoroethylene membrane, in particular to a polytetrafluoroethylene antibacterial filtering membrane. Background Art

[0002] As people pay more attention to their health and safety, the quality requirements for air and water are getting higher and higher. Polluted air and water need to be filtered to remove odors, bacteria, viruses, particulate matter and other pollutants in the water and air, so as to purify the water and air and protect people's health.

[0003] Among them, membrane filtration is a more commonly used solid-liquid separation filtration method. Membrane filtration is to filter air or water through the membrane pores, intercept impurities and pollutants in the air or water, without chemical changes, and is simple and easy to handle. However, at present, single filter materials have many shortcomings in filtration. The filter medium with large pores has poor isolation effect on tiny particles such as fine dust, particles, bacteria, etc. In some places with high purification requirements and easy breeding of bacteria, the purification capacity cannot meet the needs; and although the filter medium with small pores can filter particles with smaller particle sizes, a large number of filter particles cover the surface of the material, which is easy to cause poor air permeability of the material, blockage of the membrane pores, increase of filtration resistance, and thus reduce the filtration speed; in addition, impurity microorganisms in sewage will also cause pollution of the filter membrane, affecting the filtration effect. Utility Model Content

[0004] The purpose of the utility model is to provide a polytetrafluoroethylene antibacterial filter membrane, which has the characteristics of good adsorption and antibacterial effect and high filtering efficiency.

[0005] The technical solution of the utility model is as follows: a polytetrafluoroethylene antibacterial filtration membrane comprises a polytetrafluoroethylene ultrafiltration layer, an antibacterial layer, a polytetrafluoroethylene microfiltration layer, an activated carbon filter layer and a polytetrafluoroethylene primary filtration layer which are sequentially distributed; the polytetrafluoroethylene primary filtration layer and the polytetrafluoroethylene microfiltration layer are both membrane layers treated with ozone corona; the membrane pores of the polytetrafluoroethylene primary filtration layer and the polytetrafluoroethylene microfiltration layer are both truncated cone-shaped pores; the small pore size of the truncated cone-shaped pores of the polytetrafluoroethylene primary filtration layer faces the inlet side, and the small pore size of the truncated cone-shaped pores of the polytetrafluoroethylene microfiltration layer faces the outlet side.

[0006] In the aforementioned polytetrafluoroethylene antibacterial filtration membrane, the ratio of the large pore size to the small pore size of the truncated cone-shaped pores is 2:1.

[0007] In the aforementioned polytetrafluoroethylene antibacterial filtration membrane, the membrane pore diameter of the polytetrafluoroethylene primary filtration layer is larger than the membrane pore diameter of the polytetrafluoroethylene microfiltration layer, and the membrane pore diameter of the polytetrafluoroethylene microfiltration layer is larger than the membrane pore diameter of the polytetrafluoroethylene ultrafiltration layer.

[0008] In the aforementioned polytetrafluoroethylene antibacterial filter membrane, the activated carbon particle size of the activated carbon filter layer is 10 to 300 μm.

[0009] In the aforementioned polytetrafluoroethylene antibacterial filter membrane, the particle size of the activated carbon in the activated carbon filter layer decreases from the inlet side to the outlet side.

[0010] In the aforementioned polytetrafluoroethylene antibacterial filter membrane, the activated carbon filter layer includes a first activated carbon layer, a second activated carbon layer and a third activated carbon layer which are sequentially distributed along the filtration direction. The activated carbon particle size of the first activated carbon layer is 200 to 300 μm; the activated carbon particle size of the second activated carbon layer is 100 to 200 μm, and the activated carbon particle size of the third activated carbon layer is 10 to 100 μm.

[0011] In the aforementioned polytetrafluoroethylene antibacterial filter membrane, the antibacterial layer adopts nano-silver antibacterial agent.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model uses the polytetrafluoroethylene primary filter layer, polytetrafluoroethylene microfiltration layer, and polytetrafluoroethylene ultrafiltration layer to perform step-by-step depth filtration on the filtered material, filtering layer by layer with good filtration effect; and uses the activated carbon filter layer and the antibacterial layer to adsorb harmful pollutants and odors and colors, sterilize and antivirally treat, and inhibit the generation of bacteria on the membrane. After the polytetrafluoroethylene primary filter layer and the polytetrafluoroethylene microfiltration layer are treated with ozone corona, the adhesion with the activated carbon filter layer and the antibacterial layer is improved, and the layers are tightly combined, thereby improving the structural stability of the polytetrafluoroethylene antibacterial filter membrane.

[0014] The membrane pore shape and position design of the polytetrafluoroethylene primary filter layer and the polytetrafluoroethylene microfiltration layer can speed up the filtration efficiency of the polytetrafluoroethylene primary filter layer, reduce clogging, and increase the adsorption treatment time of the filtrate in the activated carbon filter layer, thereby improving the adsorption and antibacterial effect of the filtrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the structure of the polytetrafluoroethylene primary filter layer.

[0017] Figure 3 It is a schematic diagram of the structure of the polytetrafluoroethylene microfiltration layer.

[0018] Figure 4 It is a schematic diagram of the structure of the activated carbon filter layer.

[0019] The markings in the attached drawings are: 1. polytetrafluoroethylene ultrafiltration layer; 2. antibacterial layer; 3. polytetrafluoroethylene microfiltration layer; 4. activated carbon filter layer; 41. first activated carbon layer; 42. second activated carbon layer; 43. third activated carbon layer; 5. polytetrafluoroethylene primary filtration layer. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example:

[0023] like Figure 1-Figure 4 As shown, the polytetrafluoroethylene antibacterial filter membrane includes a polytetrafluoroethylene ultrafiltration layer 1, an antibacterial layer 2, a polytetrafluoroethylene microfiltration layer 3, an activated carbon filter layer 4 and a polytetrafluoroethylene primary filtration layer 5 which are distributed in sequence, the polytetrafluoroethylene primary filtration layer 5 and the polytetrafluoroethylene microfiltration layer 3 are both membrane layers treated with ozone corona, the membrane pores of the polytetrafluoroethylene primary filtration layer 5 and the polytetrafluoroethylene microfiltration layer 3 are both truncated cone-shaped pores, the small pore size of the truncated cone-shaped pores of the polytetrafluoroethylene primary filtration layer 5 is toward the inlet side, and the small pore size of the truncated cone-shaped pores of the polytetrafluoroethylene microfiltration layer 3 is toward the outlet side.

[0024] The filtered material is sequentially filtered through the polytetrafluoroethylene primary filter layer 5, the polytetrafluoroethylene microfiltration layer 3, and the polytetrafluoroethylene ultrafiltration layer 1 in a step-by-step manner, with good filtering effect. The filtered material is then subjected to the adsorption, sterilization and antiviral treatment of harmful pollutants and odor and color through the activated carbon filter layer 4. The antibacterial layer 2 is used for sterilization and disinfection, and the formation of bacteria on the membrane is inhibited, thereby increasing the filtering function of the membrane and prolonging the service life of the membrane. After the polytetrafluoroethylene primary filter layer 5 and the polytetrafluoroethylene microfiltration layer 3 are treated with ozone corona, micro-concave dense holes are generated on the surface, the surface activity is increased, and the surface molecules are oxidized, the surface tension is increased, thereby improving the adhesion with the activated carbon filter layer 4 and the antibacterial layer 2, and the layers are tightly combined, thereby improving the structural stability of the polytetrafluoroethylene antibacterial filter membrane.

[0025] The layers in the polytetrafluoroethylene antibacterial filter membrane can also be fixed to each other by bonding.

[0026] The membrane pore shape and position design of the polytetrafluoroethylene primary filter layer 5 and the polytetrafluoroethylene microfiltration layer 3 can speed up the filtration speed of the polytetrafluoroethylene primary filter layer 5, reduce clogging, and increase the adsorption treatment time of the filtrate in the activated carbon filter layer 4, thereby improving the filtration effect of the filtrate.

[0027] The ratio of the large pore size to the small pore size of the truncated cone pores of the polytetrafluoroethylene primary filter layer 5 is 2: 1. The truncated cone pores with this ratio have a small resistance to the flow of the filtered material from the large pore size to the small pore size, which can speed up the flow rate and reduce the occurrence of pore blockage, thereby increasing the filtration rate of the polytetrafluoroethylene primary filter layer 5 and improving the filtration operation efficiency.

[0028] The ratio of the large pore size to the small pore size of the truncated cone pores of the polytetrafluoroethylene microfiltration layer 3 is 2: 1. In the truncated cone pores with this ratio, the resistance of the filtered material flowing from the small pore size to the large pore size is large, which reduces the flow rate, thereby prolonging the adsorption treatment time of the filtered material in the activated carbon filter layer 4 and improving the filtering effect.

[0029] The membrane pore size of the polytetrafluoroethylene primary filter layer 5 is larger than that of the polytetrafluoroethylene microfilter layer 3, and the membrane pore size of the polytetrafluoroethylene microfilter layer 3 is larger than that of the polytetrafluoroethylene ultrafilter layer 1. The filtering method with different membrane pore sizes can realize layered interception of particles with different pore sizes.

[0030] The activated carbon particle size of the activated carbon filter layer 4 is 10 to 300 μm.

[0031] The particle size of the activated carbon in the activated carbon filter layer 4 decreases from the inlet side to the outlet side.

[0032] The activated carbon filter layer 4 includes a first activated carbon layer 41, a second activated carbon layer 42 and a third activated carbon layer 43 which are sequentially distributed along the filtering direction. The activated carbon particle size of the first activated carbon layer 41 is 200-300 μm; the activated carbon particle size of the second activated carbon layer 42 is 100-200 μm, and the activated carbon particle size of the third activated carbon layer 43 is 10-100 μm. The activated carbon particle size of the activated carbon filter layer 4 decreases from the inlet side to the outlet side, and the adsorption treatment effect on the pollutants is continuously increased, and the pollutants have a better interception effect, which can fully and effectively ensure the adsorption and filtration effect.

[0033] The antibacterial layer 2 is made of nano-silver antibacterial agent.

[0034] The parts not described in detail in the present invention are prior art and thus will not be described in detail here.

Claims

1. Polytetrafluoroethylene antibacterial filter membrane, characterized by: The invention comprises a polytetrafluoroethylene ultrafiltration layer (1), an antibacterial layer (2), a polytetrafluoroethylene microfiltration layer (3), an activated carbon filter layer (4) and a polytetrafluoroethylene primary filtration layer (5) which are sequentially distributed. The polytetrafluoroethylene primary filtration layer (5) and the polytetrafluoroethylene microfiltration layer (3) are both membrane layers which have been subjected to ozone corona treatment. The membrane pores of the polytetrafluoroethylene primary filtration layer (5) and the polytetrafluoroethylene microfiltration layer (3) are both truncated cone-shaped pores. The small pore size of the truncated cone-shaped pores of the polytetrafluoroethylene primary filtration layer (5) faces the inlet side, and the small pore size of the truncated cone-shaped pores of the polytetrafluoroethylene microfiltration layer (3) faces the outlet side.

2. The polytetrafluoroethylene antibacterial filtration membrane according to claim 1, characterized in that: The ratio of the large aperture to the small aperture of the truncated cone-shaped hole is 2:

1.

3. The polytetrafluoroethylene antibacterial filtration membrane according to claim 1, characterized in that: The membrane pore diameter of the polytetrafluoroethylene primary filtration layer (5) is larger than the membrane pore diameter of the polytetrafluoroethylene microfiltration layer (3), and the membrane pore diameter of the polytetrafluoroethylene microfiltration layer (3) is larger than the membrane pore diameter of the polytetrafluoroethylene ultrafiltration layer (1).

4. The polytetrafluoroethylene antibacterial filtration membrane according to claim 1, characterized in that: The activated carbon particle size of the activated carbon filter layer (4) is 10 to 300 μm.

5. The polytetrafluoroethylene antibacterial filtration membrane according to claim 1, characterized in that: The activated carbon particle size of the activated carbon filter layer (4) decreases in sequence from the inlet side to the outlet side.

6. The polytetrafluoroethylene antibacterial filtration membrane according to claim 4 or 5, characterized in that: The activated carbon filter layer (4) comprises a first activated carbon layer (41), a second activated carbon layer (42) and a third activated carbon layer (43) which are sequentially distributed along the filtering direction; the activated carbon particle size of the first activated carbon layer (41) is 200 to 300 μm; the activated carbon particle size of the second activated carbon layer (42) is 100 to 200 μm; and the activated carbon particle size of the third activated carbon layer (43) is 10 to 100 μm.

7. The polytetrafluoroethylene antibacterial filtration membrane according to claim 1, characterized in that: The antibacterial layer (2) uses nano-silver antibacterial agent.

Images