CN103785249A - Micro-filtration membrane for filtering PM2.5 particulate matters and preparation method of membrane - Google Patents
Micro-filtration membrane for filtering PM2.5 particulate matters and preparation method of membrane Download PDFInfo
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- CN103785249A CN103785249A CN201410028150.3A CN201410028150A CN103785249A CN 103785249 A CN103785249 A CN 103785249A CN 201410028150 A CN201410028150 A CN 201410028150A CN 103785249 A CN103785249 A CN 103785249A
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Abstract
The invention discloses a micro-filtration membrane for filtering PM2.5 particulate matters. The micro-filtration membrane comprises a composite layer formed by performing high-temperature hot-pressing on a separation layer and a supporting layer, wherein the separation layer is a PTFE (polytetrafluoroethylene) porous film formed by heating and stretching a PTFE base band and is in a three-dimensional stereoscopic crossed structure; the PTFE base band is formed by mixing fine PTFE powder and a lubricating agent such as petroleum ether into paste and performing extrusion by a die; the supporting layer is made of a polyethylene material and is in a meshed structure. The micro-filtration membrane has the largest pore diameter of 0.3 micron, is uniform in fiber fineness and uniform in thickness and has the porosity within 80-90 percent. According to the measurement, the gas flux can be 18000L/m<2>.min under the differential pressure of 0.1 bar, and the filtering effect is relatively obvious.
Description
Technical field
The present invention relates to a kind of filter membrane, be specifically related to microfiltration membranes of a kind of PM2.5 of filtration particle and preparation method thereof.
Background technology
Because environment is destroyed, the cost that China's economy is paid has accounted for 5% ~ 12% in GDP.It is the negative factor of World Economics power that environmental pollution has become obstruction China's upgrowth, and air pollution is an importance of environmental pollution.In February, 2012, State Council agrees to that " ambient air quality " of issuing new revision increased PM2.5 monitoring index.
PM2.5 refers to that diameter in atmosphere is less than or equal to the particle of 2.5 μ m, also referred to as entering lung particle.Although PM2.5 particle diameter is little, its specific area is very large, more easily adsorbs virulent material.Because volume is small, PM2.5 has very strong penetration power, can arrive at bronchiole wall, and disturbs the gas exchange in lung.So, huge on the impact of health and air quality.The main source that PM2.5 produces, is the residue discharging through burning in the processes such as daily generating, industrial production, motor vehicle exhaust emission, mostly contains the noxious materials such as heavy metal.
1976, first R.W.Core disclosed the manufacture process of the PTFE perforated membrane that trade name is CoreTex.First, fine polytetrafluoroethylpowder powder material is become to pasty state with mix lubricant, then paste resin is extruded and made polytetrafluoroethylene (PTFE) base band through mould, getting rid of after lubricant rising temperature (lower than fusing point), carry out unidirectional or biaxial tension, the length after stretching is raw footage more than 50 doubly.But this material aperture skewness.Be not suitable for the filtration of PM2.5 particle.In addition, the disclosed PTFE perforated membrane of United States Patent (USP) (U.S. Pat. No. 4,902,423), because aperture is excessive, is also not suitable for PM2.5 particle and filters.
Summary of the invention
The object of this invention is to provide high molecule microfilter membrane of a kind of high efficiency filter PM2.5 particle and preparation method thereof.
The present invention realizes the technical scheme that above-mentioned technical problem adopts:
Filter a microfiltration membranes for PM2.5 particle, comprise the composite bed being formed by high temperature hot pressing by separating layer and supporting layer; Described separating layer is that polytetrafluoroethylene (PTFE) base band is through heating and the polytetrafluoroethylporous porous membrane forming that stretches, be 3 D stereo cross-like structure, wherein polytetrafluoroethylene (PTFE) base band is that benzinum is mixed into pasty state and extrudes and form through mould by fine polytetrafluoroethylpowder powder and lubricant; Described supporting layer is that polythene material is made, and is network structure.As optimization: the aperture of described separating layer is 0.2 μ m-0.3 μ m, and fibre diameter is 100-200nm and even thickness, and porosity is 80%-90%.
The present invention also provides a kind of preparation method of microfiltration membranes of the PM2.5 of filtration particle, comprises the following steps:
A: PTFE powder and lubricant are mixed according to the ratio of mass ratio 10:2 to 10:3.5, mixed pasty mixture is extruded and made PTFE base band through mould;
B: heating PTFE base band is to 250oC and continue 5 minutes, and lubricant is deviate from;
C: heating PTFE base band is to 330oC-340oC and keep 40-50 second to obtain the half continuous sintered membrane of 0.3-0.5 sintering degree;
D: be cooled to 310oC-320oC, with the speed two-way simultaneous of 100%/s or continuous oriented film, cross directional stretch multiple is between 1.5 times to 5 times, and longitudinal stretching multiple is between 6 times to 15 times;
E: the PTEE film after stretching is kept carrying out for 3 minutes thermal finalization under 350oC;
F: it is compound finally PTFE film and supporting layer to be carried out to high temperature hot pressing.
As optimization: the PTFE powder in step a and lubricant mix according to mass ratio 10:3.
As optimization: in step a, the thickness of PTFE base band is 100 μ m.
As optimization: in step a, lubricant is benzinum.
Beneficial effect of the present invention:
1, pore size: by using bubble point method to measure the maximum diameter of hole of film, the high molecule microfilter membrane maximum diameter of hole of our manufacturing is 0.3 μ m, so can effectively intercept particle more than 0.3 μ m.
2, fiber thickness is even: separating layer is 3 D stereo cross-like structure, and fibre diameter is between 100 ~ 200 nm, and fiber thickness is even, the pore-size distribution inequality of having avoided thickness fiber to produce.
3, even thickness: film thickness is even, thickness is in 75 μ m left and right, and the filter effect of having avoided uneven thickness to cause is inconsistent.
4, porosity: the porosity of polytetrafluoroethylene (PTFE) separating layer is between 80% ~ 90%, and this has fully guaranteed that film has higher gas flux.
5, gas flux: through measuring, under the pressure reduction of 0.1bar, gas flux can reach 18000L/m
2min.
6, filter efficiency: high molecule microfilter membrane can reach 95% for diameter in the filter efficiency of the above particle of 0.3 μ m.This is because the maximum diameter of hole of film only has 0.3 micron, so can effectively intercept the particle that is greater than 0.3 micron.
7, filter effect: adopt particle diameter, at the carbon powder particle of 2 microns, high molecule microfilter membrane is carried out to filter effect experiment, then, under SEM, the high molecule microfilter membrane after viewing test, can clearly observe carbon powder particle and effectively be intercepted.
Accompanying drawing explanation
Fig. 1: structural representation of the present invention;
Fig. 2: high molecule microfilter membrane separating layer structure under SEM;
Fig. 3: high molecule microfilter membrane supporting layer structure under SEM;
Fig. 4: the cross-sectional structure of high molecule microfilter membrane under SEM;
Fig. 5: under SEM, PM2.5 particle is blocked image.
The specific embodiment
As shown in Figure 1, a kind of microfiltration membranes of filtering PM2.5 particle, comprises the composite bed being formed by high temperature hot pressing by separating layer 1 and supporting layer 2; Described separating layer 1 is that polytetrafluoroethylene (PTFE) base band is through heating and the polytetrafluoroethylporous porous membrane forming that stretches, be 3 D stereo cross-like structure, wherein polytetrafluoroethylene (PTFE) base band is that benzinum is mixed into pasty state and extrudes and form through mould by fine polytetrafluoroethylpowder powder and lubricant; Described supporting layer 2 is made for polythene material, is network structure, and the aperture of described separating layer 1 is 0.2 μ m-0.3 μ m, and fibre diameter is 100-200nm and even thickness, and porosity is 80%-90%.
Embodiment 1: PTFE powder and benzinum are mixed according to the ratio of mass ratio 10:3, mixed pasty mixture is extruded and made PTFE base band through mould; Heating PTFE base band is to 250oC and continue 5 minutes, and lubricant is deviate from; Heating PTFE base band is to 335oC and keep 45 seconds to obtain the half continuous sintered membrane of 0.4 sintering degree; Be cooled to 315oC, with the speed two-way simultaneous of 100%/s or continuous oriented film, 5 times of cross directional stretch multiples, 6 times of longitudinal stretching multiples; PTEE film after stretching is kept carrying out for 3 minutes thermal finalization under 350oC; Finally PTFE film and supporting layer are carried out to high temperature hot pressing compound.
Embodiment 2: PTFE powder and benzinum are mixed according to the ratio of mass ratio 10:2, mixed pasty mixture is extruded and made PTFE base band through mould; Heating PTFE base band is to 250oC and continue 5 minutes, and lubricant is deviate from; Heating PTFE base band is to 330oC and keep 50 seconds to obtain the half continuous sintered membrane of 0.5 sintering degree; Be cooled to 320oC, with the speed two-way simultaneous of 100%/s or continuous oriented film, 1.5 times of cross directional stretch multiples, 15 times of longitudinal stretching multiples; PTEE film after stretching is kept carrying out for 3 minutes thermal finalization under 350oC; Finally PTFE film and supporting layer are carried out to high temperature hot pressing compound.
Embodiment 3: PTFE powder and benzinum are mixed according to the ratio of mass ratio 10:3.5, mixed pasty mixture is extruded and made PTFE base band through mould; Heating PTFE base band is to 250oC and continue 5 minutes, and lubricant is deviate from; Heating PTFE base band is to 340oC and keep 40 seconds to obtain the half continuous sintered membrane of 0.4 sintering degree; Be cooled to 310oC, with the speed two-way simultaneous of 100%/s or continuous oriented film, 3 times of cross directional stretch multiples, 10 times of longitudinal stretching multiples; PTEE film after stretching is kept carrying out for 3 minutes thermal finalization under 350oC; Finally PTFE film and supporting layer are carried out to high temperature hot pressing compound.
The key technical indexes of the film of preparing is:
1. pore size:
By using bubble point method to measure the maximum diameter of hole of film, the high molecule microfilter membrane maximum diameter of hole of our manufacturing is 0.3 μ m, so can effectively intercept particle more than 0.3 μ m.
2. fiber thickness is even
By SEM, polytetrafluoroethylene (PTFE) separating layer is observed to (as shown in Figure 2), separating layer is 3 D stereo cross-like structure, fibre diameter is between 100 ~ 200 nm, and fiber thickness is even, the pore-size distribution inequality of having avoided thickness fiber to produce.
3. even thickness
By SEM, the cross section of microfiltration membranes is observed to (as shown in Figure 4), can find, film thickness is even, and thickness is in 75 μ m left and right, and the filter effect of having avoided uneven thickness to cause is inconsistent.
4. porosity
The porosity of polytetrafluoroethylene (PTFE) separating layer is between 80% ~ 90%, and this has fully guaranteed that film has higher gas flux.
5. gas flux
Through measuring, under the pressure reduction of 0.1bar, gas flux can reach 18000L/m
2min.
6. filter efficiency
High molecule microfilter membrane can reach 95% for diameter in the filter efficiency of the above particle of 0.3 μ m.This is because the maximum diameter of hole of film only has 0.3 micron, so can effectively intercept the particle that is greater than 0.3 micron.
7. filter effect
Adopt particle diameter, at the carbon powder particle of 2 microns, high molecule microfilter membrane is carried out to filter effect experiment, then, under SEM, the high molecule microfilter membrane after viewing test, can clearly observe carbon powder particle and effectively be intercepted (as shown in Figure 5).
Table 1.: the important technological parameters of made high molecule microfilter membrane:.
Note: 1. bubble point experiment adopts formaldehyde test.
2. air flux is to record under the pressure reduction of 0.1bar.
Claims (6)
1. a microfiltration membranes of filtering PM2.5 particle, is characterized in that: comprise the composite bed being formed by high temperature hot pressing by separating layer and supporting layer; Described separating layer is that polytetrafluoroethylene (PTFE) base band is through heating and the polytetrafluoroethylporous porous membrane forming that stretches, be 3 D stereo cross-like structure, wherein polytetrafluoroethylene (PTFE) base band is that benzinum is mixed into pasty state and extrudes and form through mould by fine polytetrafluoroethylpowder powder and lubricant; Described supporting layer is that polythene material is made, and is network structure.
2. a kind of microfiltration membranes of filtering PM2.5 particle according to claim 1, is characterized in that: the aperture of described separating layer is 0.2 μ m-0.3 μ m, and fibre diameter is 100-200nm and even thickness, and porosity is 80%-90%.
3. the preparation method of a kind of microfiltration membranes of filtering PM2.5 particle claimed in claim 1, is characterized in that: comprise the following steps:
A: PTFE powder and lubricant are mixed according to the ratio of mass ratio 10:2 to 10:3.5, mixed pasty mixture is extruded and made PTFE base band through mould;
B: heating PTFE base band is to 250oC and continue 5 minutes, and lubricant is deviate from;
C: heating PTFE base band is to 330oC-340oC and keep 40-50 second to obtain the half continuous sintered membrane of 0.3-0.5 sintering degree;
D: be cooled to 310oC-320oC, with the speed two-way simultaneous of 100%/s or continuous oriented film, cross directional stretch multiple is between 1.5 times to 5 times, and longitudinal stretching multiple is between 6 times to 15 times;
E: the PTEE film after stretching is kept carrying out for 3 minutes thermal finalization under 350oC;
F: it is compound finally PTFE film and supporting layer to be carried out to high temperature hot pressing.
4. the preparation method of a kind of microfiltration membranes of filtering PM2.5 particle according to claim 3, is characterized in that: the PTFE powder in step a and lubricant mix according to mass ratio 10:3.
5. the preparation method of a kind of microfiltration membranes of filtering PM2.5 particle according to claim 3, is characterized in that: in step a, the thickness of PTFE base band is 100 μ m.
6. the preparation method of a kind of microfiltration membranes of filtering PM2.5 particle according to claim 3, is characterized in that: in step a, lubricant is benzinum.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564205A (en) * | 2016-09-30 | 2017-04-19 | 中材科技股份有限公司 | Preparation method for high-moisture-permeability polytetrafluoroethylene film |
| WO2017080474A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene ultra-fine fiber membrane |
| CN111044666A (en) * | 2019-12-31 | 2020-04-21 | 无锡殷达尼龙有限公司 | Analysis method for trace carbon powder and salt residue in dibasic acid |
| CN112516804A (en) * | 2019-09-18 | 2021-03-19 | 无锡华润微电子有限公司 | PM2.5 protective equipment, PM2.5 filtering membrane and preparation method thereof |
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| US4620917A (en) * | 1982-02-08 | 1986-11-04 | Nippon Soken, Inc. | Electrostatic filtering device |
| CN1129456A (en) * | 1994-04-28 | 1996-08-21 | 大金工业株式会社 | Composite porous polytetrafluoroethylene membrane |
| JP2003190749A (en) * | 2001-12-26 | 2003-07-08 | Nitto Denko Corp | Production method for porous polytetrafluoroethylene film composite |
| CN202700236U (en) * | 2012-08-01 | 2013-01-30 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene microporous membrane for purifying particle matters (PM) 2.5 |
| CN103212308A (en) * | 2012-08-01 | 2013-07-24 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene millipore membrane for purifying PM2.5 |
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2014
- 2014-01-21 CN CN201410028150.3A patent/CN103785249A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4620917A (en) * | 1982-02-08 | 1986-11-04 | Nippon Soken, Inc. | Electrostatic filtering device |
| CN1129456A (en) * | 1994-04-28 | 1996-08-21 | 大金工业株式会社 | Composite porous polytetrafluoroethylene membrane |
| JP2003190749A (en) * | 2001-12-26 | 2003-07-08 | Nitto Denko Corp | Production method for porous polytetrafluoroethylene film composite |
| CN202700236U (en) * | 2012-08-01 | 2013-01-30 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene microporous membrane for purifying particle matters (PM) 2.5 |
| CN103212308A (en) * | 2012-08-01 | 2013-07-24 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene millipore membrane for purifying PM2.5 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017080474A1 (en) * | 2015-11-11 | 2017-05-18 | 重庆润泽医药有限公司 | Polytetrafluoroethylene ultra-fine fiber membrane |
| CN106564205A (en) * | 2016-09-30 | 2017-04-19 | 中材科技股份有限公司 | Preparation method for high-moisture-permeability polytetrafluoroethylene film |
| CN106564205B (en) * | 2016-09-30 | 2019-04-05 | 中材科技股份有限公司 | A kind of preparation method of high moisture-inhibiting polytetrafluoroethylene film |
| CN112516804A (en) * | 2019-09-18 | 2021-03-19 | 无锡华润微电子有限公司 | PM2.5 protective equipment, PM2.5 filtering membrane and preparation method thereof |
| CN111044666A (en) * | 2019-12-31 | 2020-04-21 | 无锡殷达尼龙有限公司 | Analysis method for trace carbon powder and salt residue in dibasic acid |
| CN111044666B (en) * | 2019-12-31 | 2022-03-25 | 无锡殷达尼龙有限公司 | Analysis method for trace carbon powder and salt residue in dibasic acid |
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Application publication date: 20140514 |