CN109529640A - The preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane - Google Patents
The preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane Download PDFInfo
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- CN109529640A CN109529640A CN201811308365.5A CN201811308365A CN109529640A CN 109529640 A CN109529640 A CN 109529640A CN 201811308365 A CN201811308365 A CN 201811308365A CN 109529640 A CN109529640 A CN 109529640A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
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Abstract
The invention discloses a kind of preparation methods of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, it is intended to solve polytetrafluoroethylhollow hollow fiber membrane filtration flux and the low deficiency of adhesion strength.The invention is the following steps are included: the biaxial tension polytetrafluoroethylene film of 0.05 μm -0.5 μm of average pore size scope, 5 μm -50 μm of thickness is cut into the band-like film of polytetrafluoroethylene (PTFE) by (1)；(2) by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion；(3) the band-like film of polytetrafluoroethylene (PTFE) after dipping is wrapped on 1 μm of -5 μm of stretch polytetrafluoroethylraw hollow-fibre membrane outer wall of average pore size scope, 1-3 layers of looping, is then heat-treated at 190 DEG C -270 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane.The polytetrafluoroethylhollow hollow fiber membrane filtration flux and adhesion strength that this programme is prepared are high.
Description
Technical field
The present invention relates to a kind of polytetrafluoroethylhollow hollow fiber membranes, more specifically, it relates to a kind of low-temperature sintering poly- four
The preparation method of vinyl fluoride hollow-fibre membrane.
Background technique
China's water resources shortage, water pollution issue are prominent, and water demand amount sustainable growth, which results in water resource supplies
Serious imbalance between supply and demand.In this context, it is the effective way for solving imbalance between supply and demand that water resource, which recycles, which dictates that at water
Manage industry has rigid demand attribute in the following longer time, has a high potential.Water treatment by membrane have effluent quality it is high, can
Direct reuse, stable effluent quality, occupied area be small, high degree of automation, many advantages such as convenient for management, is much leading
Domain puts it over application.But many polytetrafluoroethylhollow hollow fiber membrane filtration fluxs used at present and adhesion strength are low.
Summary of the invention
The present invention overcomes the low deficiencies of polytetrafluoroethylhollow hollow fiber membrane filtration flux and adhesion strength, provide one kind
The preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, the polytetrafluoroethylhollow hollow fiber membrane filtration flux being prepared
With adhesion strength height.
In order to solve the above-mentioned technical problem, the invention adopts the following technical scheme: in a kind of low-temperature sintering polytetrafluoroethylene (PTFE)
The preparation method of empty fiber membrane, comprising the following steps: (1) by 5 μm of -50 0.05 μm -0.5 μm of average pore size scope, thickness μ
The biaxial tension polytetrafluoroethylene film of m cuts into the band-like film of polytetrafluoroethylene (PTFE)；(2) the band-like film immersion of polytetrafluoroethylene (PTFE) is existed
In thermoplastic fluorocarbon resin dispersion；(3) the band-like film of polytetrafluoroethylene (PTFE) after dipping is wrapped over 1 μm -5 μm of average pore size scope
On stretch polytetrafluoroethylraw hollow-fibre membrane outer wall, 1-3 layers of looping, then it is heat-treated at 190 DEG C -270 DEG C, obtains looping
Type polytetrafluoroethylhollow hollow fiber membrane.
Looping is into the stretch polytetrafluoroethylraw as supporting layer after the band-like film immersion of polytetrafluoroethylene (PTFE) as separating layer
On empty fiber membrane outer wall.Thermoplastic fluorocarbon resin powder is scattered in decentralized medium and is formed and divide thermoplastic fluorocarbon resin dispersion, adopts
Use thermoplastic fluorocarbon resin as adhesive, the bonding for improving the band-like film of polytetrafluoroethylene (PTFE) and polytetrafluoroethylhollow hollow fiber membrane is strong
Degree, adhesion strength are greater than 0.50 Mpa, reduce the temperature of bonding, and reduction causes looping type polytetrafluoroethylene (PTFE) hollow because of high temperature
The expansion of fiber membrane aperture, while reducing energy consumption.The fusing point of polytetrafluoroethylene material is at 327 DEG C, heat treatment temperature 190
DEG C -270 DEG C, production energy consumption can be reduced, heat treatment temperature is lower than the fusing point of polytetrafluoroethylene material, the polytetrafluoroethyl-ne in heat treatment
Alkene belt type film varying aperture is small, and looping type polytetrafluoroethylhollow hollow fiber membrane aperture is stablized.Wherein flux is relative to uncoated warm
The water flux decline of the looping type polytetrafluoroethylhollow hollow fiber membrane of plasticity fluororesin is smaller.The polytetrafluoro that this programme is prepared
Ethylene doughnut Membrane Filtration Flux and adhesion strength are high.
Preferably, biaxial tension polytetrafluoroethylene film cuts into the polytetrafluoroethylene (PTFE) that width is 5 mm -15 mm
Belt type film.The width of the band-like film of polytetrafluoroethylene (PTFE) is set as 5-15 mm, convenient for looping to polytetrafluoroethylhollow hollow fiber membrane outer wall
On.
Preferably, thermoplastic fluorocarbon resin is the copolymer of polytrifluorochloroethylene (PCTFE), tetrafluoroethene and hexafluoropropene
(FEP), one of tetrafluoroethylene-ethylene copolymer (ETFE), ethylene-tetrafluoroethylene-hexafluoropropylene copolymer (ETEP) or
Two or more mixtures.Thermoplastic fluorocarbon resin used in the present invention has excellent chemical-resistant and lower fusing point,
Fusing point is between 190 DEG C -270 DEG C.
Preferably, the melt index of thermoplastic fluorocarbon resin is 5 g/10min -50 g/10min.
The melt index of thermoplastic fluorocarbon resin is less than 5 g/10min, and thermoplastic fluorocarbon resin is because of poor fluidity, adhesive property
Difference, to reduce adhesion strength；It can be blocked up when the melt index of thermoplastic fluorocarbon resin is higher than 50 g/10min because its mobility is strong
Firmly stretch polytetrafluoroethylraw hollow-fibre membrane and the most hole of the band-like film of polytetrafluoroethylene (PTFE) reduce polytetrafluoroethylhollow hollow fiber
The water flux of film.
Preferably, the mass fraction of thermoplastic fluorocarbon resin dispersion is 10%-50%.This thermoplastic fluorocarbon resin dispersion
Advantageously ensure that adhesion strength.
Preferably, the thermoplastic fluorocarbon resin in thermoplastic fluorocarbon resin dispersion is coated on the band-like film of polytetrafluoroethylene (PTFE)
The mass ratio of amount and the band-like film of polytetrafluoroethylene (PTFE) coated by thermoplastic fluorocarbon resin dispersion is (2-20): 100.
If mass ratio is less than 2:100, the amount for applying the thermoplastic fluorocarbon resin being covered with is seldom, leads to the band-like film of polytetrafluoroethylene (PTFE)
It is reduced with the adhesion strength of stretch polytetrafluoroethylraw hollow-fibre membrane；If mass ratio is greater than 20:100, the thermoplasticity being covered with is applied
Fluororesin amount is more, and the water flux of polytetrafluoroethylhollow hollow fiber membrane is caused to reduce.
Preferably, stretch polytetrafluoroethylraw hollow-fibre membrane internal diameter is 0.5 mm -2 mm, outer diameter is 1 mm -3 mm.
Be conducive to the filtering of polytetrafluoroethylhollow hollow fiber membrane.
Preferably, the porosity of stretch polytetrafluoroethylraw hollow-fibre membrane is 50%-80%.Polytetrafluoroethylhollow hollow fiber
The filtration flux of film is big.
Preferably, heat treatment time is -30 seconds 5 seconds.It avoids heat treatment time too short and influences adhesion strength, avoid heat
It handles overlong time and influences filtration flux.
Compared with prior art, the beneficial effects of the present invention are: the polytetrafluoroethylhollow hollow fiber that the present invention is prepared
Membrane Filtration Flux and adhesion strength are high.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention is further described:
A kind of embodiment 1: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) will be averaged
0.05 μm -0.5 μm of pore diameter range, 5 μm -50 μm of thickness biaxial tension polytetrafluoroethylene film cut into polytetrafluoroethyl-ne
Alkene belt type film；(2) by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion；(3) by the polytetrafluoro after dipping
Ethylene belt type film is wrapped on 1 μm of -5 μm of stretch polytetrafluoroethylraw hollow-fibre membrane outer wall of average pore size scope, and 1-3 layers of looping,
Then it is heat-treated at 190 DEG C -270 DEG C, heat treatment time is -30 seconds 5 seconds, obtains looping type polytetrafluoroethylhollow hollow fiber
Film.Biaxial tension polytetrafluoroethylene film cuts into the band-like film of polytetrafluoroethylene (PTFE) that width is 5 mm -15 mm.Thermoplastic fluoroelastomer
Resin is copolymer (FEP), the tetrafluoroethylene-ethylene copolymer of polytrifluorochloroethylene (PCTFE), tetrafluoroethene and hexafluoropropene
(ETFE), the mixture of one or more of ethylene-tetrafluoroethylene-hexafluoropropylene copolymer (ETEP).Thermoplastic fluoroelastomer
The melt index of resin is 5 g/10min -50 g/10min.The mass fraction of thermoplastic fluorocarbon resin dispersion is 10%-50%.
Thermoplastic fluorocarbon resin in thermoplastic fluorocarbon resin dispersion be coated to amount on the band-like film of polytetrafluoroethylene (PTFE) with by thermoplastic fluoroelastomer tree
The mass ratio of the band-like film of polytetrafluoroethylene (PTFE) of rouge dispersion coating is (2-20): 100.In stretch polytetrafluoroethylraw hollow-fibre membrane
Diameter is 0.5 mm -2 mm, outer diameter is 1 mm -3 mm.The porosity of stretch polytetrafluoroethylraw hollow-fibre membrane is 50%-80%.
Thermoplastic fluorocarbon resin powder is scattered in decentralized medium and is formed and divide thermoplastic fluorocarbon resin dispersion, using thermoplasticity
Fluororesin improves the adhesion strength of polytetrafluoroethylene (PTFE) band-like film and polytetrafluoroethylhollow hollow fiber membrane as adhesive, bonding
Intensity is greater than 0.50 Mpa, reduces the temperature of bonding, and reduction leads to looping type polytetrafluoroethylhollow hollow fiber membrane because of high temperature
The expansion in aperture, while reducing energy consumption.For the fusing point of polytetrafluoroethylene material at 327 DEG C, heat treatment temperature is 190 DEG C -270
DEG C, production energy consumption can be reduced, heat treatment temperature is lower than the fusing point of polytetrafluoroethylene material, and polytetrafluoroethylene (PTFE) is band-like in heat treatment
Membrane aperture variation is small, and looping type polytetrafluoroethylhollow hollow fiber membrane aperture is stablized.Wherein flux is relative to uncoated thermoplastic fluoroelastomer
The water flux decline of the looping type polytetrafluoroethylhollow hollow fiber membrane of resin is smaller.In the polytetrafluoroethylene (PTFE) that this programme is prepared
Empty fiber membrane filtration flux and adhesion strength are high.
A kind of embodiment 2: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) divide
Cut: it is 5 mm's that the biaxial tension polytetrafluoroethylene film of 0.05 μm of average pore size scope, 50 μm of thickness, which is cut into width,
The band-like film of polytetrafluoroethylene (PTFE)；(2) it impregnates: by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is polytrifluorochloroethylene (PCTFE), and mass fraction 10%, melt index is 5 g/10min, controls poly- trifluoro chlorine
The mass ratio that ethylene is coated to amount and the band-like film of polytetrafluoroethylene (PTFE) on the band-like film of polytetrafluoroethylene (PTFE) is 2:100；(3) looping and fixed
Type: choosing stretch polytetrafluoroethylraw hollow-fibre membrane, and average pore size is 1 μm, and porosity 50%, internal-and external diameter is respectively 0.5
The band-like film of polytetrafluoroethylene (PTFE) after dipping is wrapped on stretch polytetrafluoroethylraw hollow-fibre membrane outer wall, spiral by mm and 1 mm
1 layer of looping, the good polytetrafluoroethylhollow hollow fiber membrane of looping is then heat-treated 5 S at 220 DEG C, obtains looping type poly- four
Vinyl fluoride hollow-fibre membrane.
A kind of embodiment 3: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) divide
Cut: it is the poly- of 15mm that the biaxial tension polytetrafluoroethylene film of 0.5 μm of average pore size scope, 5 μm of thickness, which is cut into width,
Tetrafluoroethene belt type film；(2) it impregnates: by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion, thermoplastic fluoroelastomer
Resin is the copolymer (FEP) of tetrafluoroethene and hexafluoropropene, and mass fraction 50%, melt index is 50 g/10min, control
The mass ratio that polytrifluorochloroethylene processed is coated to amount and the band-like film of polytetrafluoroethylene (PTFE) on the band-like film of polytetrafluoroethylene (PTFE) is 20:100；
(3) looping and sizing: choosing stretch polytetrafluoroethylraw hollow-fibre membrane, and average pore size is 5 μm, porosity 80%, internal-and external diameter
The band-like film of polytetrafluoroethylene (PTFE) after dipping is wrapped over stretch polytetrafluoroethylraw hollow-fibre membrane outer wall by respectively 2mm and 3 mm
On, 3 layers of spiral looping, the good polytetrafluoroethylhollow hollow fiber membrane of looping is then heat-treated 30S at 270 DEG C, obtains looping
Type polytetrafluoroethylhollow hollow fiber membrane.
A kind of embodiment 4: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) divide
Cut: it is 10 mm's that the biaxial tension polytetrafluoroethylene film of 0.2 μm of average pore size scope, 30 μm of thickness, which is cut into width,
The band-like film of polytetrafluoroethylene (PTFE)；(2) it impregnates: by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is copolymer (FEP) mixture of polytrifluorochloroethylene (PCTFE) and tetrafluoroethene and hexafluoropropene, mass fraction
It is 30%, melt index is 25 g/10min, and control polytrifluorochloroethylene is coated to the amount and poly- four on the band-like film of polytetrafluoroethylene (PTFE)
The mass ratio of vinyl fluoride belt type film is 10:100；(3) looping and sizing: choosing stretch polytetrafluoroethylraw hollow-fibre membrane, puts down
Equal aperture is 2 μm, and porosity 60%, internal-and external diameter is respectively 1 mm and 2 mm, by the band-like film looping of polytetrafluoroethylene (PTFE) after dipping
On stretch polytetrafluoroethylraw hollow-fibre membrane outer wall, 1 layer of spiral looping, the then polytetrafluoroethylhollow hollow fiber that looping is good
Film is heat-treated 25S at 270 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane.
A kind of embodiment 5: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) divide
Cut: it is 10 mm's that the biaxial tension polytetrafluoroethylene film of 0.3 μm of average pore size scope, 40 μm of thickness, which is cut into width,
The band-like film of polytetrafluoroethylene (PTFE)；(2) it impregnates: by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is tetrafluoroethylene-ethylene copolymer (ETFE) and ethylene-tetrafluoroethylene-hexafluoropropylene copolymer (ETEP) mixture,
Its mass fraction is 30%, and melt index is 25 g/10min, and control polytrifluorochloroethylene is coated on the band-like film of polytetrafluoroethylene (PTFE)
Amount and the band-like film of polytetrafluoroethylene (PTFE) mass ratio be 10:100；(3) looping and sizing: the hollow fibre of stretch polytetrafluoroethylraw is chosen
Film is tieed up, average pore size is 2 μm, and porosity 60%, internal-and external diameter is respectively 1 mm and 2 mm, by the polytetrafluoroethylene (PTFE) after dipping
Belt type film is wrapped on stretch polytetrafluoroethylraw hollow-fibre membrane outer wall, and 1 layer of spiral looping, the then polytetrafluoroethyl-ne that looping is good
Alkene hollow-fibre membrane is heat-treated 25 S at 190 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane.
A kind of embodiment 6: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) divide
Cut: it is 10 mm's that the biaxial tension polytetrafluoroethylene film of 0.4 μm of average pore size scope, 30 μm of thickness, which is cut into width,
The band-like film of polytetrafluoroethylene (PTFE)；(2) it impregnates: by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is polytrifluorochloroethylene (PCTFE) and ethylene-tetrafluoroethylene-hexafluoropropylene copolymer (ETEP) mixture, quality
Score is 30%, and melt index is 25 g/10min, control polytrifluorochloroethylene be coated to amount on the band-like film of polytetrafluoroethylene (PTFE) with
The mass ratio of the band-like film of polytetrafluoroethylene (PTFE) is 10:100；(3) looping and sizing: choosing stretch polytetrafluoroethylraw hollow-fibre membrane,
Its average pore size is 3 μm, and porosity 60%, internal-and external diameter is respectively 1 mm and 2 mm, and the polytetrafluoroethylene (PTFE) after dipping is band-like
Film is wrapped on stretch polytetrafluoroethylraw hollow-fibre membrane outer wall, 1 layer of spiral looping, then will be in the good polytetrafluoroethylene (PTFE) of looping
Empty fiber membrane is heat-treated 25 S at 190 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane.
A kind of embodiment 7: preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, comprising the following steps: (1) divide
Cut: it is 10 mm's that the biaxial tension polytetrafluoroethylene film of 0.2 μm of average pore size scope, 30 μm of thickness, which is cut into width,
The band-like film of polytetrafluoroethylene (PTFE)；(2) it impregnates: by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is the copolymer (FEP) of polytrifluorochloroethylene (PCTFE), tetrafluoroethene and hexafluoropropene, tetrafluoroethylene-Ethylene copolymerization
The mixture of object (ETFE) three, mass fraction 30%, melt index are 25 g/10min, and control polytrifluorochloroethylene applies
The mass ratio of the amount and the band-like film of polytetrafluoroethylene (PTFE) that are layed on the band-like film of polytetrafluoroethylene (PTFE) is 10:100；(3) looping and sizing: choosing
Stretch polytetrafluoroethylraw hollow-fibre membrane is taken, average pore size is 2 μm, and porosity 60%, internal-and external diameter is respectively 1 mm and 2
The band-like film of polytetrafluoroethylene (PTFE) after dipping is wrapped on stretch polytetrafluoroethylraw hollow-fibre membrane outer wall, spiral looping 1 by mm
Layer, is then heat-treated 20 S for the good polytetrafluoroethylhollow hollow fiber membrane of looping at 240 DEG C, obtains looping type polytetrafluoroethyl-ne
Alkene hollow-fibre membrane.
Comparative example 1:(1) cutting: 0.2 μm of average pore size is chosen, 30 μm of thickness of biaxial tension polytetrafluoroethylene
Film cuts into the band-like film of polytetrafluoroethylene (PTFE) that width is 10 mm；(2) looping and sizing: choosing polytetrafluoroethylhollow hollow fiber,
Its average pore size is 2 μm, and porosity 60%, internal-and external diameter is respectively 1 mm and 2 mm, by the above-mentioned polytetrafluoroethylene (PTFE) cut
Belt type film is wrapped on such polytetrafluoroethylhollow hollow fiber external annulus, and the looping number of plies is 1 layer, by the good polytetrafluoroethyl-ne of looping
Alkene hollow-fibre membrane is sintered 25 S at 350 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane.
Comparative example 2:(1) cutting: 0.3 μm of average pore size is chosen, 40 μm of thickness of biaxial tension polytetrafluoroethylene
Film cuts into the band-like film of polytetrafluoroethylene (PTFE) that width is 10 mm；(2) it impregnates, chooses thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is ETFE and ETEP mixture, and mass fraction 30%, melt index is 25 g/10min, has been cut above-mentioned
For the band-like film immersion of polytetrafluoroethylene (PTFE) in the thermoplastic fluorocarbon resin dispersion, control mixing thermoplastic fluorocarbon resin is coated to polytetrafluoro
The mass ratio of amount and the band-like film of polytetrafluoroethylene (PTFE) on ethylene belt type film is 35:100；(3) looping and sizing: polytetrafluoroethyl-ne is chosen
Alkene doughnut, average pore size are 2 μm, porosity 60%, internal-and external diameter is respectively 1 mm and 2 mm, have been cut above-mentioned
The band-like film of polytetrafluoroethylene (PTFE) is wrapped on such polytetrafluoroethylhollow hollow fiber external annulus, and the looping number of plies is 1 layer, and looping is good
Polytetrafluoroethylhollow hollow fiber membrane 25 S are sintered at 190 DEG C, obtain looping type polytetrafluoroethylhollow hollow fiber membrane.
Comparative example 3:(1) cutting: 0.4 μm of average pore size is chosen, 30 μm of thickness of biaxial tension polytetrafluoroethylene
Film cuts into the band-like film of polytetrafluoroethylene (PTFE) that width is 10 mm；(2) it impregnates, chooses thermoplastic fluorocarbon resin dispersion, thermoplasticity
Fluororesin is PCTFE and ETEP mixture, and mass fraction 30%, melt index is 1 g/10min, has been cut above-mentioned
For the band-like film immersion of polytetrafluoroethylene (PTFE) in the thermoplastic fluorocarbon resin dispersion, control mixing thermoplastic fluorocarbon resin is coated to polytetrafluoro
Amount on ethylene belt type film be 10:100 by the mass ratio of the band-like film of polytetrafluoroethylene (PTFE)；(3) looping and sizing: polytetrafluoro is chosen
Ethylene doughnut, average pore size are 3 μm, and porosity 60%, internal-and external diameter is respectively 1 mm and 2 mm, has been cut above-mentioned
The band-like film of polytetrafluoroethylene (PTFE) be wrapped on such polytetrafluoroethylhollow hollow fiber external annulus, the looping number of plies is 1 layer, by looping
Good polytetrafluoroethylhollow hollow fiber membrane is sintered 25 S at 190 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane.
Looping type polytetrafluoroethylhollow hollow fiber membrane made from above-described embodiment and comparative example is tested for the property, is surveyed
Test result is as shown in table 1, and test method is as follows:
(1) average pore size test method
Using Porosimetry (Capillary Flow Porometer CFP-1200AE, by Porous Materials company
Manufacture), and use GALWICK (1,1,2,3,3,3- propylene oxide hexahydro fluoric acid (propylene, 1,1,2,3,
3,3 ,-oxidized hexahydrofluoric acid) and (by Porous Materials company produce)) as liquid
Measure the average pore size of looping type polytetrafluoroethylhollow hollow fiber membrane.Specifically, average pore size is determined in the following manner.Firstly,
Respectively when film wire is dry and when film wire is infiltrated by liquid, the pressure difference being applied in film wire and the air stream through film wire are measured
Relationship between speed.Obtain two figures are referred to as drying curve and drawdown curve.By by air stream in drying curve
Speed halves and the pressure difference of the point of intersection of the curve and drawdown curve of drafting is expressed as P (Pa).It is determined by following equalities flat
Equal aperture:
Average pore size d (μm)=c γ/P,
Wherein, c indicates constant 2860, and γ is the surface tension (dyne/cm) of the liquid.
(2) test method of pure water flux:
Pure water flux test is tested at 0.1 MPa of external pressure, and the effective of looping type polytetrafluoroethylhollow hollow fiber membrane is used in test
Length is 30 cm, and test water temperature control is at 25 ± 1 DEG C.Operation weighs the production water volume in 1 minute after five minutes, is calculated as follows
The pure water flux of looping type polytetrafluoroethylhollow hollow fiber membrane:
F=60*M/(4 * π * D * L)。
Wherein F: pure water flux, L/m2.h.0.1MPa；
M: water volume, ml are produced；
D: the outer diameter of polytetrafluoroethylhollow hollow fiber membrane, mm；
L: the effective length of polytetrafluoroethylhollow hollow fiber membrane, m.
(3) test method of the adhesion strength of polytetrafluoroethylhollow hollow fiber supporting layer and separating layer:
Two looping type polytetrafluoroethylhollow hollow fiber membranes are taken, U-shaped is curved, film wire open end is encapsulated with adhesive, and keeps
Film wire opening, takes about 30 cm of film wire effective length, tests membrane component as adhesion strength.Will test membrane component fix, and will in
Empty fiber membrane is placed in water, is then slowly introducing high pressure gas through pressure reducing valve to middle hollow-fibre membrane inner cavity.Slowly improve air inlet
Pressure, 0.05 MPa of every raising keep pressure to wait 1 min, while observing whether the separating layer on hollow-fibre membrane has rupture
Phenomenon.Admission pressure when the separating layer of hollow-fibre membrane ruptures is the bonding of doughnut supporting layer and separating layer
Intensity.
Embodiment described above is seven kinds of preferable schemes of the invention, not makees limit in any form to the present invention
System, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (9)
1. a kind of preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane, characterized in that the following steps are included: (1) will
0.05 μm -0.5 μm of average pore size scope, 5 μm -50 μm of thickness biaxial tension polytetrafluoroethylene film cut into poly- four
Vinyl fluoride belt type film；(2) by the band-like film immersion of polytetrafluoroethylene (PTFE) in thermoplastic fluorocarbon resin dispersion；It (3) will be poly- after dipping
Tetrafluoroethene belt type film is wrapped on 1 μm of -5 μm of stretch polytetrafluoroethylraw hollow-fibre membrane outer wall of average pore size scope, looping 1-
It 3 layers, is then heat-treated at 190 DEG C -270 DEG C, obtains looping type polytetrafluoroethylhollow hollow fiber membrane。
2. the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane according to claim 1, characterized in that two-way
Stretch polytetrafluoroethylraw plate membrane cuts into the band-like film of polytetrafluoroethylene (PTFE) that width is 5 mm -15 mm.
3. the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane according to claim 1, characterized in that thermoplastic
Property fluororesin be polytrifluorochloroethylene (PCTFE), tetrafluoroethene and hexafluoropropene copolymer (FEP), tetrafluoroethylene-Ethylene it is total
The mixture of one or more of polymers (ETFE), ethylene-tetrafluoroethylene-hexafluoropropylene copolymer (ETEP).
4. the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane according to claim 1, characterized in that thermoplastic
Property fluororesin melt index be 5 g/10min -50 g/10min.
5. the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane according to claim 1, characterized in that thermoplastic
Property fluororesin dispersion mass fraction be 10%-50%.
6. according to claim 1 to the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane described in 5 any one,
Be characterized in, the thermoplastic fluorocarbon resin in thermoplastic fluorocarbon resin dispersion be coated to amount on the band-like film of polytetrafluoroethylene (PTFE) with by thermoplastic
Property fluororesin dispersion coating the band-like film of polytetrafluoroethylene (PTFE) mass ratio be (2-20): 100.
7. according to claim 1 to the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane described in 5 any one,
It is characterized in, stretch polytetrafluoroethylraw hollow-fibre membrane internal diameter is 0.5 mm -2 mm, outer diameter is 1 mm -3 mm.
8. according to claim 1 to the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane described in 5 any one,
It is characterized in, the porosity of stretch polytetrafluoroethylraw hollow-fibre membrane is 50%-80%.
9. according to claim 1 to the preparation method of low-temperature sintering polytetrafluoroethylhollow hollow fiber membrane described in 5 any one,
It is characterized in, heat treatment time is -30 seconds 5 seconds.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394068A (en) * | 2019-06-21 | 2019-11-01 | 苏州智能制造研究院有限公司 | A kind of Janus polytetrafluoroethylhollow hollow fiber membrane and preparation method thereof |
| CN111111473A (en) * | 2020-01-14 | 2020-05-08 | 浙江开创环保科技股份有限公司 | Polytetrafluoroethylene composite membrane based on partially fusible support tube and preparation method thereof |
| CN111111471A (en) * | 2020-01-14 | 2020-05-08 | 浙江开创环保科技股份有限公司 | PTFE hollow fiber composite membrane with high peel strength and preparation method thereof |
| CN113680217A (en) * | 2021-09-06 | 2021-11-23 | 扬中市福达绝缘电器有限公司 | Preparation method of multilayer polytetrafluoroethylene hollow fiber membrane |
| CN114247300A (en) * | 2021-12-28 | 2022-03-29 | 湖北聚孚膜科技有限公司 | Anti-pollution PTFE hollow fiber microfiltration membrane and preparation method thereof |
| CN115845635A (en) * | 2023-02-02 | 2023-03-28 | 山东东岳高分子材料有限公司 | Polytetrafluoroethylene hollow fiber membrane and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961609A (en) * | 2010-10-15 | 2011-02-02 | 浙江理工大学 | Polytetrafluoroethylene hollow fiber stretching device |
| CN102266725A (en) * | 2011-06-09 | 2011-12-07 | 浙江东大环境工程有限公司 | Polytetrafluoroethylene hollow fiber membrane and preparation method thereof |
| CN202129031U (en) * | 2011-06-09 | 2012-02-01 | 浙江东大环境工程有限公司 | Wrapped type polytetrafluoroethylene hollow fiber membrane |
-
2018
- 2018-11-05 CN CN201811308365.5A patent/CN109529640A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961609A (en) * | 2010-10-15 | 2011-02-02 | 浙江理工大学 | Polytetrafluoroethylene hollow fiber stretching device |
| CN102266725A (en) * | 2011-06-09 | 2011-12-07 | 浙江东大环境工程有限公司 | Polytetrafluoroethylene hollow fiber membrane and preparation method thereof |
| CN202129031U (en) * | 2011-06-09 | 2012-02-01 | 浙江东大环境工程有限公司 | Wrapped type polytetrafluoroethylene hollow fiber membrane |
Non-Patent Citations (2)
| Title |
|---|
| （美）TERRY RICHARDSON著；杨进勇等译: "《复合材料设计指南》", 31 January 1997, 武汉：武汉工业大学出版社 * |
| 上海市塑料研究所 钱知勉编: "《塑料性能应用手册》", 31 July 1982, 上海科学技术文献出版社 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394068A (en) * | 2019-06-21 | 2019-11-01 | 苏州智能制造研究院有限公司 | A kind of Janus polytetrafluoroethylhollow hollow fiber membrane and preparation method thereof |
| CN110394068B (en) * | 2019-06-21 | 2021-12-10 | 苏州智能制造研究院有限公司 | Janus polytetrafluoroethylene hollow fiber membrane and preparation method thereof |
| CN111111473A (en) * | 2020-01-14 | 2020-05-08 | 浙江开创环保科技股份有限公司 | Polytetrafluoroethylene composite membrane based on partially fusible support tube and preparation method thereof |
| CN111111471A (en) * | 2020-01-14 | 2020-05-08 | 浙江开创环保科技股份有限公司 | PTFE hollow fiber composite membrane with high peel strength and preparation method thereof |
| CN113680217A (en) * | 2021-09-06 | 2021-11-23 | 扬中市福达绝缘电器有限公司 | Preparation method of multilayer polytetrafluoroethylene hollow fiber membrane |
| CN114247300A (en) * | 2021-12-28 | 2022-03-29 | 湖北聚孚膜科技有限公司 | Anti-pollution PTFE hollow fiber microfiltration membrane and preparation method thereof |
| CN115845635A (en) * | 2023-02-02 | 2023-03-28 | 山东东岳高分子材料有限公司 | Polytetrafluoroethylene hollow fiber membrane and preparation method thereof |
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