CN104785130B - A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane - Google Patents
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane Download PDFInfo
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Abstract
The present invention relates to the technical field of thin film, particularly provide a kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane.Its water flux is 1,200 3000 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters)；The processing method of polytetrafluoroethylmicroporous microporous membrane comprises the following steps: batch mixing: by teflon resin powder, lubricating oil and inorganic salt powder by weight being mixed evenly for 1:0.2 0.28:0.01 0.2, at a temperature of 40 80 DEG C, stand 10 16 hours, form politef material；The differential scanning calorimetry test degree of crystallinity of described teflon resin powder is 98 99.9%, number-average molecular weight is 200 1,000 ten thousand；Pressed compact and calendering；Longitudinal stretching；Cross directional stretch and thermal finalization.Polytetrafluoroethylmicroporous microporous membrane of the present invention can one-shot forming, its processing method can give thin film entirety hydrophilicity.
Description
Technical field
The present invention relates to the technical field of thin film, particularly provide a kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane.
Background technology
The microstructure of " fibril-node " can be formed through the polytetrafluoroethylmicroporous microporous membrane of biaxial tension molding, it is made up of a large amount of micropores, plus polytetrafluoroethylmaterial material itself, there is acid and alkali-resistance, the characteristic such as corrosion-resistant, high temperature resistant, be therefore widely used in air and water filtration field of purification.But in water filtration field, needing hydrophilic thin film, politef itself has strong-hydrophobicity, it is therefore desirable to hydrophilic modifying.Method about PTFE material performing hydrophilic modification on surface is reported the most in a large number at present.Main method has chemical graft hydrophilic group method, high-energy radiation (electron beam etc.) initiation grafting hydrophilic group method, action of plasma to introduce the method such as surface hydroxyl and carboxyl.But there is the technical problems such as apparatus expensive, modified effect be the best in these methods.
Such as CN102872732A (2013-1-16) discloses the hydrophilic modification method of a kind of microporous teflon membran, use fluorine-containing polyether glycol solution impregnation microporous teflon membran, a kind of hydrophilic cross-linking network polyurethane polymer is generated in microporous teflon membran polyreaction the most under certain conditions with polyisocyanates, and prepare hydrophilic microporous teflon membran, but the overall hydrophilic of this thin film haves much room for improvement.
Summary of the invention
It is an object of the invention to provide a kind of can one-shot forming, give thin film entirety hydrophilicity hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane.
The above-mentioned technical purpose of the present invention has the technical scheme that
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane, the water flux of thin film is 1200-3000 kg/hour square metre (pressure 1 Kilogram Force Per Square Centimeter)；The processing method of described polytetrafluoroethylmicroporous microporous membrane comprises the following steps:
(1) batch mixing: by teflon resin powder, lubricating oil and inorganic salt powder by weight being mixed evenly for 1:0.2-0.28:0.01-0.2, stands 10-16 hour at a temperature of 40-80 DEG C, forms politef material；The differential scanning calorimetry test degree of crystallinity of described teflon resin powder is 98-99.9%, number-average molecular weight is 200-1000 ten thousand；
(2) pressed compact and calendering: by described politef material at 30-50 DEG C, harder is pressed into cylindrical blank, blank is extruded club by pushing machine at a temperature of 40-60 DEG C, at calender is at 40-60 DEG C, is then rolled into politef base band；
(3) longitudinal stretching: described politef base band is carried out longitudinal stretching in the baking oven of 180-300 DEG C, it is thus achieved that defat base band；
(4) cross directional stretch and thermal finalization: by described defat base band cross directional stretch at 180-210 DEG C, then 250-380 DEG C of sintering sizing, the sintering time 20-80 second, obtains heat-setting thin-film.
Teflon resin powder can use commercially available prod, such as Daikin company F106, the product of Japan AGC company CD123.According to processing film technique of the present invention, using the method that inorganic salt is blended in raw material, inorganic salt provides hydrophilic first, and two is that inorganic salt can keep stable in film manufacturing process, the most aging.Being derived from hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane, inorganic salt gives thin film entirety hydrophilic.In use, inorganic salt can be dissolved in water thin film, but as long as being permanently emplaced in water environment by thin film, in certain outer pressure, water can persistently pass through thin film, not interfere with the usability of thin film.Owing to using blending method, thin film can one-shot forming, be not required to carry out follow-up modified work.
As preferably, described inorganic salt powder is powdered sodium carbonate or calcium carbonate powder.
Select specific inorganic salt powder, the polytetrafluoroethylmicroporous microporous membrane that hydrophilicity is good can be obtained, and contribute to biaxial tension when preparing.
As preferably, described lubricating oil is the one in liquid paraffin, petroleum ether, kerosene.
As preferably, the processing method of described polytetrafluoroethylmicroporous microporous membrane also includes described heat-setting thin-film spraying cooling water, obtain the polytetrafluoroethylmicroporous microporous membrane that thin film lateral shrinkage is less than 2% and longitudinal contraction rate is less than 3%, concrete spraying method is that described cooling water temperature is 10-20 DEG C, 5-20 second cool water shower time, hydraulic pressure 1000-10000 handkerchief, makes the thin film after thermal finalization be rapidly decreased to 20 DEG C.
Owing to using cold water process after thin film thermal finalization, reduce rapidly film temperature,
Cool time is short, effective, and technique is simple, and processing cost is low；Using or in storing process, while keeping good hydrophilic performance, will not reduce aperture because film dimensions is shunk, therefore the horizontal and vertical size of thin film is maintained.
As preferably, described powdered sodium carbonate is nanoscale sodium carbonate water wetted material, concrete preparation method is: by ethanol that nanoscale sodium carbonate, mass concentration are 95%, hydrazine hydrate solution, dodecyl sodium sulfate with crown ether according to mass ratio 1:(1-2): (0.02-0.05): (10-30): (0.01-0.03) is placed in hermetic container, practical Ultrasound Instrument dispersion, sucking filtration, form primary water wetted material, then primary water wetted material dehydrated alcohol is continued sucking filtration 10-30 hour, vacuum dried after obtain nanoscale sodium carbonate water wetted material.
The nanoscale sodium carbonate water wetted material using the method to prepare has synergistic function to the polytetrafluoroethylmicroporous microporous membrane of the good stability of the dimension that preparation has excellent hydrophilic and biaxial tension.
As preferably, after carrying out Ultrasound Instrument dispersion, nitrogen is passed through hermetic container, is 40-70 DEG C of heated and stirred 15-30min in temperature.
As preferably, described nanoscale sodium carbonate, mass concentration be 95% ethanol, hydrazine hydrate solution, dodecyl sodium sulfate be 1:1.5:0.04:16:0.02 with the mass ratio of crown ether.
As preferably, between described batch mixing step and pressed compact and calendaring processes, also include soft-bake step, specifically described politef material is placed in the calorstat of 30-40 DEG C standing 12-24h.Soft-bake step can improve the stability of film hydrophilic performance and bidirectional size.
As preferably, the weight ratio of teflon resin powder, lubricating oil and powdered sodium carbonate in described step (1) is 1:0.25:0.018.
Detailed description of the invention
Embodiment one:
1, batch mixing: teflon resin powder, liquid paraffin, powdered sodium carbonate are mixed evenly according to the ratio that weight ratio is 1:0.2:0.01,16 hours are stood at a temperature of 40 DEG C, make toner be sufficiently mixed with fluid lubricant, form politef material；
2, pressed compact and calendering: politef material is pressed at 30 DEG C on harder cylindrical blank, extrudes club by blank at a temperature of 40 DEG C by pushing machine, is then rolled into politef base band at 40 DEG C through calender；
3, longitudinal stretching: by politef base band longitudinal stretching in 180 DEG C of baking ovens, it is thus achieved that defat base band；
4, cross directional stretch and thermal finalization: by described defat base band cross directional stretch at 180 DEG C, then at 380 DEG C of sintering sizings, sintering time 20 seconds, obtains heat-setting thin-film.
The hydrophilic polyfluortetraethylemicroporous microporous film material prepared by said method, water flux is 1200 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
Embodiment two:
1, batch mixing: teflon resin powder, petroleum ether, powdered sodium carbonate are mixed evenly according to the ratio that weight ratio is 1:0.28:0.2,10 hours are stood at a temperature of 80 DEG C, make toner be sufficiently mixed with fluid lubricant, form politef material；
2, pressed compact and calendering: politef material is pressed at 50 DEG C on harder cylindrical blank, extrudes club by blank at a temperature of 60 DEG C by pushing machine, is then rolled into politef base band at 60 DEG C through calender；
3, longitudinal stretching: by politef base band longitudinal stretching in 300 DEG C of baking ovens, it is thus achieved that defat base band；
4, cross directional stretch and thermal finalization: by described defat base band cross directional stretch at 210 DEG C, then at 250 DEG C of sintering sizings, sintering time 80 seconds, obtains heat-setting thin-film；
The polytetrafluoroethylmicroporous microporous membrane material prepared by said method, water flux is 2500 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
Embodiment three:
1, batch mixing: teflon resin powder, kerosene, powdered sodium carbonate are mixed evenly according to the ratio that weight ratio is 1:0.25:0.1,12 hours are stood at a temperature of 60 DEG C, make toner be sufficiently mixed with fluid lubricant, form politef material；
2, pressed compact and calendering: politef material is pressed at 40 DEG C on harder cylindrical blank, extrudes club by blank at a temperature of 50 DEG C by pushing machine, is then rolled into politef base band at 50 DEG C through calender；
3, longitudinal stretching: by politef base band longitudinal stretching in 220 DEG C of baking ovens, it is thus achieved that defat base band；
4, cross directional stretch and thermal finalization: by described defat base band cross directional stretch at 200 DEG C, then at 280 DEG C of sintering sizings, sintering time 60 seconds, obtains heat-setting thin-film；
The polytetrafluoroethylmicroporous microporous membrane material prepared by said method, water flux is 2000 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
Embodiment four
With embodiment one, except for the difference that the weight ratio of teflon resin powder, lubricating oil and powdered sodium carbonate is 1:0.25:0.018.
Between batch mixing step and pressed compact and calendaring processes, also include soft-bake step, specifically described politef material is placed in the calorstat of 30 DEG C standing 12h.
By heat-setting thin-film spraying cooling water after thermal finalization, obtain the polytetrafluoroethylmicroporous microporous membrane that thin film lateral shrinkage is less than 2% and longitudinal contraction rate is less than 3%, concrete spraying method be described cooling water temperature be 10 DEG C, 5 seconds cool water shower time, hydraulic pressure 1000 handkerchief, makes the thin film after thermal finalization be rapidly decreased to 20 DEG C.
Powdered sodium carbonate is nanoscale sodium carbonate water wetted material, concrete preparation method is: ethanol that nanoscale sodium carbonate, mass concentration are 95%, hydrazine hydrate solution, dodecyl sodium sulfate are placed in hermetic container according to mass ratio 1:1:0.02:10:0.03 with crown ether, practical Ultrasound Instrument dispersion, nitrogen is passed through hermetic container, is 40 DEG C of heated and stirred 15min in temperature；Sucking filtration, forms primary water wetted material, then primary water wetted material dehydrated alcohol is continued sucking filtration 10 hours, vacuum dried after obtain nanoscale sodium carbonate water wetted material.
The polytetrafluoroethylmicroporous microporous membrane material prepared by said method, water flux is 2600 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
Embodiment five
With embodiment two, except for the difference that the weight ratio of teflon resin powder, lubricating oil and powdered sodium carbonate is 1:0.25:0.018.
Between batch mixing step and pressed compact and calendaring processes, also include soft-bake step, specifically described politef material is placed in the calorstat of 40 DEG C standing 24h.
By heat-setting thin-film spraying cooling water after thermal finalization, obtain the polytetrafluoroethylmicroporous microporous membrane that thin film lateral shrinkage is less than 2% and longitudinal contraction rate is less than 3%, concrete spraying method be described cooling water temperature be 20 DEG C, 20 seconds cool water shower time, hydraulic pressure 10000 handkerchief, makes the thin film after thermal finalization be rapidly decreased to 20 DEG C.
Powdered sodium carbonate is nanoscale sodium carbonate water wetted material, concrete preparation method is: ethanol that nanoscale sodium carbonate, mass concentration are 95%, hydrazine hydrate solution, dodecyl sodium sulfate are placed in hermetic container according to mass ratio 1:2:0.05:30:0.01 with crown ether, practical Ultrasound Instrument dispersion, nitrogen is passed through hermetic container, is 70 DEG C of heated and stirred 30min in temperature；Sucking filtration, forms primary water wetted material, then primary water wetted material dehydrated alcohol is continued sucking filtration 10-30 hour, vacuum dried after obtain nanoscale sodium carbonate water wetted material.
The polytetrafluoroethylmicroporous microporous membrane material prepared by said method, water flux is 2800 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
Embodiment six
With embodiment three, except for the difference that the weight ratio of teflon resin powder, lubricating oil and powdered sodium carbonate is 1:0.25:0.018.
Between batch mixing step and pressed compact and calendaring processes, also include soft-bake step, specifically described politef material is placed in the calorstat of 38 DEG C standing 20h.
By heat-setting thin-film spraying cooling water after thermal finalization, obtain the polytetrafluoroethylmicroporous microporous membrane that thin film lateral shrinkage is less than 2% and longitudinal contraction rate is less than 3%, concrete spraying method be described cooling water temperature be 15 DEG C, 12 seconds cool water shower time, hydraulic pressure 8000 handkerchief, makes the thin film after thermal finalization be rapidly decreased to 20 DEG C.
Powdered sodium carbonate is nanoscale sodium carbonate water wetted material, concrete preparation method is: ethanol that nanoscale sodium carbonate, mass concentration are 95%, hydrazine hydrate solution, dodecyl sodium sulfate are placed in hermetic container according to mass ratio 1:1.5:0.04:16:0.02 with crown ether, practical Ultrasound Instrument dispersion, nitrogen is passed through hermetic container, is 50 DEG C of heated and stirred 20min in temperature；Sucking filtration, forms primary water wetted material, then primary water wetted material dehydrated alcohol is continued sucking filtration 20 hours, vacuum dried after obtain nanoscale sodium carbonate water wetted material.
The polytetrafluoroethylmicroporous microporous membrane material prepared by said method, water flux is 3000 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
Embodiment seven
With embodiment six, except for the difference that inorganic salt powder selects calcium carbonate.The polytetrafluoroethylmicroporous microporous membrane material prepared by said method, water flux is 2000 kgs/hour square metres (pressure 1 Kilogram Force Per Square Centimeters).
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; the present embodiment can be made after reading this specification by those skilled in the art as required does not has the amendment of creative contribution, but as long as all being protected by Patent Law in scope of the presently claimed invention.
Claims (7)
1. a hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane, it is characterised in that: under pressure 1 Kilogram Force Per Square Centimeter, the water flux of described polytetrafluoroethylmicroporous microporous membrane is 1200-3000 kg/hour square metre；The processing method of described polytetrafluoroethylmicroporous microporous membrane comprises the following steps:
(1) batch mixing: by teflon resin powder, lubricating oil and inorganic salt powder by weight being mixed evenly for 1:0.2-0.28:0.01-0.2, stands 10-16 hour at a temperature of 40-80 DEG C, forms politef material；The differential scanning calorimetry test degree of crystallinity of described teflon resin powder is 98-99.9%, number-average molecular weight is 200-1000 ten thousand；
Described inorganic salt powder is powdered sodium carbonate；
Described powdered sodium carbonate is nanoscale sodium carbonate water wetted material, concrete preparation method is: by ethanol that nanoscale sodium carbonate, mass concentration are 95%, hydrazine hydrate solution, dodecyl sodium sulfate with crown ether according to mass ratio 1:(1-2): (0.02-0.05): (10-30): (0.01-0.03) is placed in hermetic container, use Ultrasound Instrument is disperseed, sucking filtration, form primary water wetted material, then primary water wetted material dehydrated alcohol is continued sucking filtration 10-30 hour, vacuum dried after obtain nanoscale sodium carbonate water wetted material；
(2) pressed compact and calendering: by described politef material at 30-50 DEG C, harder is pressed into cylindrical blank, blank is extruded club by pushing machine at a temperature of 40-60 DEG C, at calender is at 40-60 DEG C, is then rolled into politef base band；
(3) longitudinal stretching: described politef base band is carried out longitudinal stretching in the baking oven of 180-300 DEG C, it is thus achieved that defat base band；
(4) cross directional stretch and thermal finalization: by described defat base band cross directional stretch at 180-210 DEG C, then 250-380 DEG C of sintering sizing, the sintering time 20-80 second, obtains heat-setting thin-film.
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane the most according to claim 1, it is characterised in that: described lubricating oil is the one in liquid paraffin, petroleum ether, kerosene.
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane the most according to claim 2, it is characterized in that: the processing method of described polytetrafluoroethylmicroporous microporous membrane also includes described heat-setting thin-film spraying cooling water, obtain the polytetrafluoroethylmicroporous microporous membrane that thin film lateral shrinkage is less than 2% and longitudinal contraction rate is less than 3%, concrete spraying method is that described cooling water temperature is 10-20 DEG C, 5-20 second cool water shower time, hydraulic pressure 1000-10000 handkerchief, makes the thin film after thermal finalization be rapidly decreased to 20 DEG C.
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane the most according to claim 3, it is characterised in that: after carrying out Ultrasound Instrument dispersion, nitrogen is passed through hermetic container, is 40-70 DEG C of heated and stirred 15-30min in temperature, carry out sucking filtration the most again.
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane the most according to claim 4, it is characterised in that: described nanoscale sodium carbonate, mass concentration be 95% ethanol, hydrazine hydrate solution, dodecyl sodium sulfate be 1:1.5:0.04:16:0.02 with the mass ratio of crown ether.
6. according to a kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane described in any one of claim 1-5, it is characterized in that: between described batch mixing step and pressed compact and calendaring processes, also include soft-bake step, specifically described politef material is placed in the calorstat of 30-40 DEG C standing 12-24h.
A kind of hydrophilic biaxial tension polytetrafluoroethylmicroporous microporous membrane the most according to claim 6, it is characterised in that: the weight ratio of teflon resin powder, lubricating oil and powdered sodium carbonate in described step (1) is 1:0.25:0.018.
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