CN103657257A - Efficient electret filtration material and preparation method thereof - Google Patents
Efficient electret filtration material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an efficient electret filtration material and a preparation method thereof. The efficient electret filtration material comprises a non-woven fabric layer and a charged coating being subjected to an electret treatment, wherein the coating is positioned on the outer surface of the non-woven fabric layer. The preparation method comprises: (1) forming a non-woven fabric layer; (2) molding a coating on the outer surface of the non-woven fabric layer in a foaming manner; and (3) carrying out an electret treatment on the coating to make the coating be the electret. The efficient electret filtration material has effects of high filtration precision, low filtration resistance, high filtration efficiency, easy ash cleaning and improved filtration material service life.
Description
Technical field
The present invention relates to filtering material field, relate in particular a kind of electret high efficiency filter material and preparation method thereof.
Background technology
Because environmental problem constantly worsens, haze is more and more serious, and PM2.5 has caused the concern of all departments.According to statistics, the first half of the year in 2013 Beijing PM2.5 part-time up to 950mg/m3, China 74 city PM2.5 be 70mg/m3, WHO requires as 25mg/m3, it is serious that the cities such as Beijing produce haze situation, serious to environment, had a strong impact on the people's quality of life.So the pore size filter of filtering material and filtering accuracy are had higher requirement, general acupuncture filtering particle particle diameter is 5-10um, and overlay film acupuncture filtering particle particle diameter is 0.5-2um; Routine needling filtering accuracy is 99%, and overlay film is 99.999%, and the filtering accuracy of electret filtering material is 99.99-99.999%.
Wherein, overlay film has the shortcoming that gas permeability is poor, cost is high and resistance is high, electret filtering material is improving under filter efficiency and filtering accuracy prerequisite, also overcome gas permeability poor simultaneously, a resistance high-technology difficult problem, is very suitable for static little, and dust is thin, the special operation conditions that wait more, as: part circulating fluid-bed power plant and garbage burning factory etc.
Conventional fiber filter material catches that dirt mainly relies on that Blang is spread, held back, inertial collision and the directly mechanical stop effect such as interception, between filtering material and particle, a little less than electrostatic adsorption very, like this particle diameter is less than to the particulate filter poor effect below 1m.If filtering material strengthens Electrostatic Absorption in airfiltering process, except original mechanical stop effect, rely on Coulomb force directly attract the charged corpuscle in gas phase and caught, or induction neutral corpuscle polarization is caught again, thereby the subparticle of filtering gas carrier in mutually more effectively, filter efficiency will strengthen undoubtedly greatly, and air drag can not increase.
The basic principle of electret air filtering material dedusting is to utilize filter media fibre itself charged, by the Coulomb force of charged fiber (being electret), realizes catching dust.The fiber polarizing in electret air filtering material makes fiber diffuse into netted hole due to the repulsive interaction of static conventionally, and gap size, much larger than the size of dust, has formed the fiber spacing Open architecture more much bigger than dust size.When dust process filtering material, electrostatic force can not only attract charged dust effectively, and with electrostatic induction effect, catches the neutral particle of induced polarization.Compare with traditional mechanical type air cleaner, when identical effect, its resistance is only the 10-30% of mechanical type filter, than the approximately low order of magnitude of mechanical type air cleaner.
Summary of the invention
The first object of the present invention is to provide a kind of electret high efficiency filter material, and it has the effect that filtering accuracy is high, filtration resistance is low, filter efficiency is high, be convenient to deashing and have long service life.
In order to reach above-mentioned purpose, solution of the present invention is:
An electret high efficiency filter material, wherein, comprises nonwoven layer and processes and charged coating through electret, this coating is positioned at the outer surface of nonwoven layer.
Further, this coating be by inorganic electret material with foaming technological forming on nonwoven layer, this inorganic electret material is selected from barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminium oxide or titanium oxide.
Further, this nonwoven layer is formed after mixing shredding, carding, lapping and acupuncture by the polyphenylene sulfide fibre of 30-70wt% and the polytetrafluoroethylene fibre of 30-70wt%, the line density of this polyphenylene sulfide fibre is 1.0-1.5D, fibre length is 51-76mm, the line density of this polytetrafluoroethylene fibre is 1.0-1.5D, and fibre length is 48-65mm.
The second object of the present invention is to provide a kind of preparation method of electret high efficiency filter material, wherein, comprises the steps:
1. mold nonwoven layer;
2. on the outer surface of nonwoven layer, the mode by foaming molds coating;
3. coating is carried out to electret processing so that coating becomes electret.
Further, the nonwoven layer of this step in is 1. to form after mixing shredding, carding, lapping and acupuncture with the polyphenylene sulfide fibre of 30-70wt% and the polytetrafluoroethylene fibre of 30-70wt%, the line density of this polyphenylene sulfide fibre is 1.0-1.5D, fibre length is 51-76mm, the line density of this polytetrafluoroethylene fibre is 1.0-1.5D, and fibre length is 48-65mm.
Further, in mixed process, add non-ionic antistatic agent; In carding process, adopt titanium alloy card clothing, carding machine speed is 600-800r/min; In lapping process, upper dolly speed 25-40m/min, lapping carriage 30-45m/min, lower dolly speed 8-15m/min; In acupuncture course, adopt 5 needing machines, latter two is that dystopy is to thorn machine, first punch frequency and the degree of depth are respectively 150-200r/min, 12-14mm, second punch frequency and the degree of depth are respectively 200-350r/min, 7-9mm, San road punch frequency and the degree of depth are respectively 300-450r/min, 4-6mm, and Si road punch frequency and the degree of depth are respectively 250-400r/min, 4-6mm, and Wu road punch frequency and the degree of depth are respectively 250-400r/min, 2-4mm.
Further, this coating be by inorganic electret material dissolves in organic solvent, after milled processed, under the acting in conjunction of blowing agent 10-20g/ml and thickener 5-15g/ml, foam and process and obtain, this inorganic electret material is 0.5-5g/ml.
Further, this organic solvent is ethanol.
Further, this inorganic electret material is selected from barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminium oxide or titanium oxide.
Further, 3. this step is to adopt the mode of corona discharge or thermal poling to carry out electret.
Adopt after said structure, a kind of electret high efficiency filter material the present invention relates to and preparation method thereof, it by being formed with coating on the outer surface of nonwoven layer, and this coating is carried out to electret processing and charged, thereby can form a kind of brand-new electret air filtering material, there is the feature that filtering accuracy is high, filtration resistance is low and filter efficiency is high.
Compared with prior art, also at least there is following beneficial effect in the present invention:
One, the inorganic electret material adopting due to this coating has high temperature resistant and high performance feature, so can effectively improve charge storage and the charge stability of whole filtering material, having increased electret effect is electrostatic effect, utilize the electret effect of material, can effectively improve the filter efficiency of material.
Two, this coating can be by surface electrostatic effect, forms ultrafiltration dust cake, and thin space and electrostatic interaction by dust cake can be blocked in dust on filter felt surface, improve its surface filtration efficiency.
Three, electret, due to electrostatic interaction, is difficult for dewfall, sticky powder, and easy-to-clean ash, dust is difficult for infiltration material deep layer place, so the pressure loss do not increase with extending service time, also can greatly improve thus the service life of whole filtering material.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention relates to a kind of electret high efficiency filter material.
In figure:
Nonwoven layer-1; Coating-2.
The specific embodiment
In order further to explain technical scheme of the present invention, below by specific embodiment, the present invention will be described in detail.
As shown in Figure 1, a kind of electret high efficiency filter material the present invention relates to, it comprises nonwoven layer 1 and coating 2, and this coating 1 is positioned at the outer surface of nonwoven layer 2, and this coating 2 is electriferous state through electret processing.More specifically, this coating 2 be by inorganic electret material with foaming technological forming on nonwoven layer 1, this inorganic electret material is selected from barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminium oxide or titanium oxide.
The present invention also provides a kind of preparation method of electret high efficiency filter material, comprises the steps:
1. mold nonwoven layer; Particularly, this nonwoven layer is to form after mixing shredding, carding, lapping and acupuncture with the polyphenylene sulfide fibre of 30-70wt% and the polytetrafluoroethylene fibre of 30-70wt%.
Wherein, the line density of this polyphenylene sulfide fibre (PPS) is 1.0-1.5D, and fibre length is 51-76mm, and the line density of this polytetrafluoroethylene fibre (PTFE) is 1.0-1.5D, and fibre length is 48-65mm.This polyphenylene sulfide fibre and polytetrafluoroethylene fibre all adopt superfine fibre, so can greatly improve dust catching efficiency, its average efficiency rises to 99.9% (fine fiber) than traditional structure electret fiber from 95%, improvement may come from the rising of free space random distribution rate between fiber, causes holding dirt place and filter mechanism more perfect; In addition, the improvement of the formed new construction air cleaner of meticulous electret fiber performance, is because show larger appearance dirt space and stronger electric field divergence on filter material space structure.Because polytetrafluoroethylene fibre electrostatic efficiency is large, therefore add non-ionic antistatic agent in mixed process.
In carding operation, because polytetrafluoroethylene fibre density is large, single fibre strength is poor, curling little, so adopt titanium alloy card clothing at carding process, carding machine speed is 600-800r/min.
In lapping process, because fibre cohesion is little, between each dolly drawing-off little, dolly speed 25-40m/min on this, lapping carriage 30-45m/min, lower dolly speed 8-15m/min.
In acupuncture course, adopt 5 needing machines, latter two is that dystopy is to thorn machine, first punch frequency and the degree of depth are respectively 150-200r/min, 12-14mm, second punch frequency and the degree of depth are respectively 200-350r/min, 7-9mm, San road punch frequency and the degree of depth are respectively 300-450r/min, 4-6mm, and Si road punch frequency and the degree of depth are respectively 250-400r/min, 4-6mm, and Wu road punch frequency and the degree of depth are respectively 250-400r/min, 2-4mm.
Preferably, the nonwoven layer of above-mentioned formation also carries out following functional processing:
1. press polish: upper roll temperature is 200-220, and lower roll temperature is 230-250, and pressure is 0.4Mpa, and speed is 7.5-8.5m/min.By press polish operation, control the thickness of needled filtering felt, improve its density, contribute to filter efficiency to improve and physical index improvement.
2. singe: adopt natural gas processings of singing, by the firepower 7-7.5bar of control flame and the speed 35-40m/min that Nomex is singed, control the operation of singing, to guarantee cloth cover effect.By burning surface hairiness, make fiber surface keep certain smoothness, this can reduce adsorbing powder dust filter bag surface, can improve cleaning efficiency simultaneously.
3. flood: adopt soft rubber roller, surfacing, reduces adhesion, effectively controls impregnation resin content.Pressure roller is 0.5MPa, and grammes per square metre is 20-30g/m2, and the speed of a motor vehicle is 5m/min, and this polytetrafluoroethylene fibre impregnation process improves heatproof, and corrosion resistance, gives fiber surface smooth structure.
2. on the outer surface of nonwoven layer, the mode by foaming molds coating; Particularly, this coating be by inorganic electret material dissolves in organic solvent, after milled processed, under the acting in conjunction of blowing agent 10-20g/ml and thickener 5-15g/ml, foam and process and obtain, this inorganic electret material is 0.5-5g/ml.This organic solvent is preferably ethanol, and this ethanol plays the work of solvent on the one hand in order to dissolve inorganic material, and in entering baking oven process, volatilization heat absorption, contributes to cloth cover dry on the other hand.
Preferably, this inorganic electret material is selected from barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminium oxide or titanium oxide.Ratio for inorganic electret material, it has considerable influence effect according to fibrous raw material and Nomex thickness, processing mode, if ratio is too high, by corona discharge or thermal poling effect, accumulated multi-charge, and caused fibre dust cake blocked up, resistance increases, even accumulate excessively, can cause damaging Nomex.And ratio is too low, be unfavorable for charge accumulated, cannot form certain thickness dust cake, affect filtering accuracy; And utilize the surface that inorganic material forms to be difficult for, because the reasons such as moisture produce adhesion, being convenient to deashing.
3. coating is carried out to electret processing so that coating becomes electret; Preferably adopt the mode of corona discharge or thermal poling to carry out electret.
Embodiment 1:
1. shredding: it is raw material that this nonwoven layer be take 70% polyphenylene sulfide fibre PPS and 30% polytetrafluoroethylene fibre PTFE, through mixing shredding, forms non-woven felt after carding, lapping and 5 road acupunctures.The line density of this polyphenylene sulfide fibre is 1.5D, and fibre length is 60mm, and the line density of polytetrafluoroethylene fibre is 1.0D, and fibre length is 51mm.Because PTFE fiber electrostatic effect is large, in mixed process, add non-ionic antistatic agent.
2. combing: because PTFE fibre density is large, single fibre strength is poor, curling little, so carding process adopts titanium alloy card clothing, reducing carding machine speed is 750r/min.
3. lapping: fibre cohesion is little, between each dolly, drawing-off is little.Upper dolly speed 33m/min, lapping carriage 40m/min, lower dolly speed 12m/min.
4. acupuncture: adopt 5 needing machines, latter two is that dystopy is to thorn machine.First punch frequency and the degree of depth are respectively 150r/min, 14mm, and second punch frequency and the degree of depth are respectively 280r/min, 8mm.San road punch frequency and the degree of depth are respectively 300r/min, 6mm.Si road punch frequency and the degree of depth are respectively 400r/min, 4mm.Wu road punch frequency and the degree of depth are respectively 400r/min, 2mm.
Functional processing
1. press polish: upper roll temperature is 210, and lower roll temperature is that 230. pressure are 0.4MPa.Speed is 8m/min.
2. singe: adopt natural gas processings of singing, by the firepower 7bar. of control flame and the speed 35m/min that Nomex is singed, control the operation of singing, to guarantee cloth cover effect.
3. flood: adopt soft rubber roller, surfacing, reduces adhesion, effectively controls impregnation resin content.Pressure roller is 0.5MPa, and grammes per square metre is 20-30g/m2, and the speed of a motor vehicle is 5m/min
4. intumescent coating: adopt intumescent coating to process, can effectively form on surface one deck electret material, improve functional processing effect.Gas release and foaming effect: control gas release is 20-30g/m2, because this electret material is inorganic material, so higher to the quality requirement of gas release and one-tenth bubble.By controlling the ratio of blowing agent and thickener, reach the object of uniform gluing and controlled quentity controlled variable.By being dissolved in organic solvent ethanol, carry out milled processed.Under blowing agent 12g/m2 and thickener 8g/m2 acting in conjunction, carry out intumescent coating processing.Inorganic electret material 1.5g/m2.Because PPS proportion of fibers is large, the fluffy and PPS fiber adhesion of Nomex is better than PTFE fiber.
5. corona discharge or thermal poling carry out electret.
1. shredding: it is raw material that this nonwoven layer be take 50% polyphenylene sulfide fibre PPS and 50% polytetrafluoroethylene fibre PTFE, through mixing shredding, forms non-woven felt after carding, lapping and 5 road acupunctures.The line density of this polyphenylene sulfide fibre is 1.0D, and fibre length is 51, and the line density of polytetrafluoroethylene fibre is 1.0, and fibre length is 51mm.Because PTFE fiber electrostatic effect is large, in mixed process, add non-ionic antistatic agent.
2. combing: because PTFE fibre density is large, single fibre strength is poor, curling little, so carding process adopts titanium alloy card clothing, reducing carding machine speed is 700r/min.
3. lapping: fibre cohesion is little, between each dolly, drawing-off is little.Upper dolly speed 30m/min, lapping carriage 34m/min, lower dolly speed 10m/min.
4. acupuncture: adopt 5 needing machines, latter two is that dystopy is to thorn machine.First punch frequency and the degree of depth are respectively 170r/min, 13mm, and second punch frequency and the degree of depth are respectively 300r/min, 9mm.San road punch frequency and the degree of depth are respectively 320r/min, 6mm.Si road punch frequency and the degree of depth are respectively 400r/min, 4mm.Wu road punch frequency and the degree of depth are respectively 400r/min, 2mm.
Functional processing
1. press polish: upper roll temperature is 220, and lower roll temperature is that 240. pressure are 0.4MPa.Speed is 7.5m/min.
2. singe: adopt natural gas processings of singing, by the firepower 7bar. of control flame and the speed 35m/min that Nomex is singed, control the operation of singing, to guarantee cloth cover effect.
3. flood: adopt soft rubber roller, surfacing, reduces adhesion, effectively controls impregnation resin content.Pressure roller is 0.5MPa, and grammes per square metre is 20-30g/m2, and the speed of a motor vehicle is 5m/min
4. intumescent coating: adopt intumescent coating to process, can effectively form on surface one deck electret material, improve functional processing effect.Gas release and foaming effect: control gas release is 20-30g/m2, because this electret material is inorganic material, so higher to the quality requirement of gas release and one-tenth bubble.By controlling the ratio of blowing agent and thickener, reach the object of uniform gluing and controlled quentity controlled variable.By being dissolved in organic solvent ethanol, carry out milled processed.Under blowing agent 15g/m2 and thickener 10g/m2 acting in conjunction, carry out intumescent coating processing.Inorganic electret material 1g/m2.
5. corona discharge or thermal poling carry out electret.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present invention.
Claims (10)
1. an electret high efficiency filter material, is characterized in that, comprises nonwoven layer and processes and charged coating through electret, and this coating is positioned at the outer surface of nonwoven layer.
2. a kind of electret high efficiency filter material as claimed in claim 1, it is characterized in that, this coating be by inorganic electret material with foaming technological forming on nonwoven layer, this inorganic electret material is selected from barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminium oxide or titanium oxide.
3. a kind of electret high efficiency filter material as claimed in claim 1, it is characterized in that, this nonwoven layer is formed after mixing shredding, carding, lapping and acupuncture by the polyphenylene sulfide fibre of 30-70wt% and the polytetrafluoroethylene fibre of 30-70wt%, the line density of this polyphenylene sulfide fibre is 1.0-1.5D, fibre length is 51-76mm, the line density of this polytetrafluoroethylene fibre is 1.0-1.5D, and fibre length is 48-65mm.
4. a preparation method for electret high efficiency filter material, is characterized in that, comprises the steps:
1. mold nonwoven layer;
2. on the outer surface of nonwoven layer, the mode by foaming molds coating;
3. coating is carried out to electret processing so that coating becomes electret.
5. the preparation method of a kind of electret high efficiency filter material as claimed in claim 4, it is characterized in that, the nonwoven layer of this step in is 1. to form after mixing shredding, carding, lapping and acupuncture with the polyphenylene sulfide fibre of 30-70wt% and the polytetrafluoroethylene fibre of 30-70wt%, the line density of this polyphenylene sulfide fibre is 1.0-1.5D, fibre length is 51-76mm, the line density of this polytetrafluoroethylene fibre is 1.0-1.5D, and fibre length is 48-65mm.
6. the preparation method of a kind of electret high efficiency filter material as claimed in claim 5, is characterized in that, adds non-ionic antistatic agent in mixed process; In carding process, adopt titanium alloy card clothing, carding machine speed is 600-800r/min; In lapping process, upper dolly speed 25-40m/min, lapping carriage 30-45m/min, lower dolly speed 8-15m/min; In acupuncture course, adopt 5 needing machines, latter two is that dystopy is to thorn machine, first punch frequency and the degree of depth are respectively 150-200r/min, 12-14mm, second punch frequency and the degree of depth are respectively 200-350r/min, 7-9mm, San road punch frequency and the degree of depth are respectively 300-450r/min, 4-6mm, and Si road punch frequency and the degree of depth are respectively 250-400r/min, 4-6mm, and Wu road punch frequency and the degree of depth are respectively 250-400r/min, 2-4mm.
7. the preparation method of a kind of electret high efficiency filter material as claimed in claim 4, it is characterized in that, this coating be by inorganic electret material dissolves in organic solvent, after milled processed, under the acting in conjunction of blowing agent 10-20g/ml and thickener 5-15g/ml, foam processing and obtain, this inorganic electret material is 0.5-5g/ml.
8. the preparation method of a kind of electret high efficiency filter material as claimed in claim 7, is characterized in that, this organic solvent is ethanol.
9. the preparation method of a kind of electret high efficiency filter material as claimed in claim 7, is characterized in that, this inorganic electret material is selected from barium titanate, lead zirconate titanate, zinc oxide, tantalum oxide, aluminium oxide or titanium oxide.
10. the preparation method of a kind of electret high efficiency filter material as claimed in claim 4, is characterized in that, 3. this step is to adopt the mode of corona discharge or thermal poling to carry out electret.
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| CN106422527A (en) * | 2016-11-29 | 2017-02-22 | 安徽元琛环保科技股份有限公司 | PTFE (polytetrafluoroethylene) foaming coating finishing agent and preparation method of composite filter of coating thereof |
| CN108993033A (en) * | 2017-06-06 | 2018-12-14 | 北京随能科技有限公司 | A kind of air cleaning facility, clean air package and air purification method |
| CN107569913A (en) * | 2017-11-02 | 2018-01-12 | 无锡风正科技有限公司 | A kind of new electret filter and preparation method thereof |
| CN112337192A (en) * | 2020-09-16 | 2021-02-09 | 齐鲁工业大学 | Efficient filtering material containing foaming coating and preparation method and application thereof |
| CN112337192B (en) * | 2020-09-16 | 2021-12-07 | 齐鲁工业大学 | Efficient filtering material containing foaming coating and preparation method and application thereof |
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|---|---|
| CN103657257B (en) | 2015-11-18 |
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