CN112642301A - PVDF/PS hollow fiber electropositive membrane for life straw - Google Patents
PVDF/PS hollow fiber electropositive membrane for life straw Download PDFInfo
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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
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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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
- B01D71/34—Polyvinylidene fluoride
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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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2325/22—Thermal or heat-resistance properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2325/26—Electrical properties
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Abstract
The invention discloses a PVDF/PS hollow fiber electropositive membrane for a life suction pipe, which comprises an ultrathin epidermal layer and a microporous layer positioned on the outer surface wall of the ultrathin epidermal layer, wherein the ultrathin epidermal layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, the pores of the selective permeation membrane are 0.001-0.1 mu m, and the ultrathin epidermal layer comprises the following components: 5-9% of polyvinylidene fluoride (PVDF) and 8-16% of polyether sulfone (PES). According to the PVDF/PS hollow fiber electropositive membrane, the pollution resistance is high, elements in the PVDF/PS hollow fiber electropositive membrane have high negative polarity, so that the PVDF/PS hollow fiber electropositive membrane is not easy to adsorb organic matters and has good pollution resistance, and meanwhile, the PVDF/PS hollow fiber electropositive membrane has a uniform membrane tissue structure, uniform pore distribution, small membrane surface pores and large inner roar, so that the membrane pores are not easy to be polluted and blocked, and the interception effect of the PVDF/PS hollow fiber electropositive membrane is greatly improved.
Description
Technical Field
The invention relates to the technical field of hollow fiber membranes, in particular to a PVDF/PS hollow fiber electropositive membrane for a life straw.
Background
With the development of economic society, the water environment pollution is aggravated, the water quality of a water source is worsened, and more pollutants, particularly organic pollutants, are in the water. The traditional drinking water treatment method only acts on general organic pollutants, has poor removal effect on the two insects and algae, is easy to generate byproducts in disinfection, and has the main problem of industrial research by controlling the membrane process pollution. In the household water purification industry, due to the limitation of operation requirements, too many auxiliary and complex filtering operations are obviously unrealistic, and the filtering operation requirements of the water purifier are simple and easy to implement. The raw water of the household water purifier is municipal tap water, and the raw water does not need to be pretreated at all by ultrafiltration membrane filtration. Therefore, the best mode for controlling membrane pollution during the use process of the ultrafiltration membrane is to select a proper anti-pollution membrane material, and the hollow fiber ultrafiltration membrane is one of the ultrafiltration membranes. It is the most mature and advanced technique in ultrafiltration technology. The wall of the hollow fiber pipe is distributed with micropores, the aperture is larger than the molecular weight of the interception substance, the interception molecular weight can reach thousands to hundreds of thousands, and the hollow fiber pipe is mainly used for the ultrafiltration water purifier. The commonly used direct drinking machine is the ultrafiltration technology.
The ultrafiltration membranes in the prior art are more in types, and can be divided into inorganic membranes and organic membranes according to different membrane materials, ceramic ultrafiltration membranes in the inorganic membranes are more in application in household water purifiers, the ceramic membranes are long in service life and corrosion resistant, but the outlet water has a soil flavor, so that the taste of the edible water is influenced, and meanwhile, the ceramic membranes are easy to block and are not easy to clean; the hollow fiber ultrafiltration membrane has the advantages of large filling density, large effective membrane area, high pure water flux, simple operation, easy cleaning and the like, and is widely applied to the household water purification industry. The ultrafiltration technology can meet the requirements of the purification process of new-generation drinking water, remove 'two worms', viruses, bacteria, algae and aquatic organisms in the drinking water and ensure the safety of the drinking water, and at present, membranes for household water purifiers on the market are basically hollow fiber membrane hollow fiber ultrafiltration membranes, and the working modes mainly comprise external pressure type filtration and internal pressure type filtration. The external pressure type filtration means that raw water is filtered from the outer side of the hollow membrane wire through the wall of the filter membrane to form a permeated liquid which flows out from the inner side of the hollow membrane wire, a dirt layer formed by the external pressure type filtration is arranged on the outer wall of the hollow fiber membrane wire, and a dirt layer formed by the internal pressure type filtration is arranged on the inner wall of the hollow fiber membrane wire.
Disclosure of Invention
The invention aims to: in order to solve the problem of low interception rate of the hollow fiber electropositive membrane, the PVDF/PS hollow fiber electropositive membrane for the life suction pipe is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a PVDF/PS hollow fiber electropositive membrane for a life suction pipe comprises an ultrathin epidermal layer and a microporous layer positioned on the outer surface wall of the ultrathin epidermal layer, wherein the ultrathin epidermal layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, and pores of the selective permeation membrane are 0.001-0.1 mu m.
As a further description of the above technical solution:
the components of the extremely thin skin layer are as follows: 5-9% by weight of polyvinylidene fluoride (PVDF), 8-16% by weight of Polyethersulfone (PES), 15-20% by weight of Polysulfone (PS), 9-13% by weight of Polyacrylonitrile (PAN), 16-20% by weight of polyvinyl chloride (PVC), 13-19% by weight of polypropylene (PP), and 11-30% by weight of Polyethylene (PE).
As a further description of the above technical solution:
the microporous layer has the following components: 82-93% of polytetrafluoroethylene and 7-18% of micropore regulator.
As a further description of the above technical solution:
the microporous layer has voids in the shape of a sponge or a plurality of fingers.
As a further description of the above technical solution:
the wall thickness of the very thin skin layer is 200-600 μm.
As a further description of the above technical solution:
the wall thickness of the microporous layer is 52-80 μm.
As a further description of the above technical solution:
the preparation method of the PVDF/PS hollow fiber electropositive membrane comprises the following steps:
s1, mixing 5-9 wt% of polyvinylidene fluoride (PVDF), 8-16 wt% of polyether sulfone (PES), 15-20 wt% of Polysulfone (PS), 9-13 wt% of Polyacrylonitrile (PAN), 16-20 wt% of polyvinyl chloride (PVC), 13-19 wt% of polypropylene (PP) and 11-30 wt% of Polyethylene (PE) solution, heating for 1h at 45-75 ℃, and carrying out ultrasonic treatment after full stirring to obtain the ultrathin epidermal layer membrane-making solution;
s2, heating a mixed solution of 82-93 wt% of polytetrafluoroethylene and 7-18 wt% of a micropore regulator for 1h at 45-75 ℃, fully stirring, and performing ultrasonic treatment to obtain a microporous layer membrane-making solution;
s3, pouring the ultrathin epidermal layer membrane-forming liquid into a reaction kettle, and carrying out vacuum defoaming for 30min at the temperature of 30-40 ℃;
s4, pouring the ultrathin skin layer membrane-forming liquid into a spinning machine, introducing nitrogen into the spinning machine to pressurize to 0.1-0.3MPa, then opening a spinning pump, controlling the rotating speed to be 20-55r/min, controlling the rotating speed of a core liquid pump to be 15-25r/min, opening a discharge valve, and winding ultrathin skin layer fibers sprayed out of a spinning nozzle on a core tube after passing through a coagulating bath;
s5, taking down the ultrathin skin layer formed on the core tube, then placing the ultrathin skin layer in the microporous layer membrane-making solution, soaking for 24 hours, and then drying at room temperature to obtain the PVDF/PS hollow fiber electropositive membrane.
As a further description of the above technical solution:
the temperature of the coagulation bath is 15-25 ℃.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the PVDF/PS hollow fiber electropositive membrane, the pollution resistance is high, elements in the PVDF/PS hollow fiber electropositive membrane have high negative polarity, so that the PVDF/PS hollow fiber electropositive membrane is not easy to adsorb organic matters and has good pollution resistance, and meanwhile, the PVDF/PS hollow fiber electropositive membrane has a uniform membrane tissue structure, uniform pore distribution, small membrane surface pores and large inner roar, so that the membrane pores are not easy to be polluted and blocked, and the interception effect of the PVDF/PS hollow fiber electropositive membrane is greatly improved.
2. In the invention, the PVDF/PS hollow fiber electropositive membrane also has high heat resistance, incombustibility and outstanding corrosion resistance, and is not easy to be corroded by strong acid and strong alkali.
3. In the invention, the PVDF/PS hollow fiber electropositive membrane filament flux can be normally recovered by chemically cleaning with a cleaning agent, so that the PVDF ultrafiltration membrane filter core can be repeatedly used, and the utilization rate of the PVDF/PS hollow fiber electropositive membrane is improved.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
Please refer to table 1, a PVDF/PS hollow fiber electropositive membrane for a life straw comprises an ultra-thin skin layer and a microporous layer located on the outer surface wall of the ultra-thin skin layer, the wall thickness of the ultra-thin skin layer is 200-600 μm, the wall thickness of the microporous layer is 52-80 μm, the ultra-thin skin layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, the pores of the selective permeation membrane are 0.001-0.1 μm, and the ultra-thin skin layer comprises the following components: 5-9% of polyvinylidene fluoride (PVDF), 8-16% of Polyethersulfone (PES), 15-20% of Polysulfone (PS), 9-13% of Polyacrylonitrile (PAN), 16-20% of polyvinyl chloride (PVC), 13-19% of polypropylene (PP) and 11-30% of Polyethylene (PE), wherein the microporous layer comprises the following components: 82-93% of polytetrafluoroethylene and 7-18% of micropore regulator by weight percentage, wherein the shape of the gap of the micropore layer is spongy or multi-finger;
the preparation method of the PVDF/PS hollow fiber electropositive membrane comprises the following steps:
s1, mixing solutions of polyvinylidene fluoride (PVDF) with the weight percentage of 5%, polyether sulfone (PES) with the weight percentage of 12%, Polysulfone (PS) with the weight percentage of 17%, Polyacrylonitrile (PAN) with the weight percentage of 10%, polyvinyl chloride (PVC) with the weight percentage of 18%, polypropylene (PP) with the weight percentage of 13% and Polyethylene (PE) with the weight percentage of 30%, heating for 1h at the temperature of 45-75 ℃, and carrying out ultrasonic treatment after full stirring to obtain an ultrathin skin layer membrane-making solution;
s2, heating a mixed solution of 82% of polytetrafluoroethylene and 18% of a micropore regulator in percentage by weight for 1h at 45-75 ℃, fully stirring, and then carrying out ultrasonic treatment to obtain a microporous layer membrane-making solution;
s3, pouring the ultrathin epidermal layer membrane-forming liquid into a reaction kettle, and carrying out vacuum defoaming for 30min at the temperature of 30-40 ℃;
s4, pouring the ultrathin skin layer membrane-forming liquid into a spinning machine, introducing nitrogen into the spinning machine to pressurize to 0.1-0.3MPa, then opening a spinning pump, controlling the rotating speed to be 20-55r/min, controlling the rotating speed of a core liquid pump to be 15-25r/min, opening a discharge valve, winding ultrathin skin layer fibers sprayed out of a spinning nozzle on a core pipe after passing through a coagulating bath, wherein the temperature of the coagulating bath is 15-25 ℃;
s5, taking down the ultrathin skin layer formed on the core tube, then placing the ultrathin skin layer in the microporous layer membrane-making solution, soaking for 24 hours, and then drying at room temperature to obtain the PVDF/PS hollow fiber electropositive membrane.
Example 2
Please refer to table 1, a PVDF/PS hollow fiber electropositive membrane for a life straw comprises an ultra-thin skin layer and a microporous layer located on the outer surface wall of the ultra-thin skin layer, the wall thickness of the ultra-thin skin layer is 200-600 μm, the wall thickness of the microporous layer is 52-80 μm, the ultra-thin skin layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, the pores of the selective permeation membrane are 0.001-0.1 μm, and the ultra-thin skin layer comprises the following components: 5-9% of polyvinylidene fluoride (PVDF), 8-16% of Polyethersulfone (PES), 15-20% of Polysulfone (PS), 9-13% of Polyacrylonitrile (PAN), 16-20% of polyvinyl chloride (PVC), 13-19% of polypropylene (PP) and 11-30% of Polyethylene (PE), wherein the microporous layer comprises the following components: 82-93% of polytetrafluoroethylene and 7-18% of micropore regulator by weight percentage, wherein the shape of the gap of the micropore layer is spongy or multi-finger;
the preparation method of the PVDF/PS hollow fiber electropositive membrane comprises the following steps:
s1, mixing 7% by weight of polyvinylidene fluoride (PVDF), 14% by weight of polyether sulfone (PES), 18% by weight of Polysulfone (PS), 13% by weight of Polyacrylonitrile (PAN), 19% by weight of polyvinyl chloride (PVC), 15% by weight of polypropylene (PP) and 14% by weight of Polyethylene (PE) solution, heating for 1h at 45-75 ℃, fully stirring and then carrying out ultrasonic treatment to obtain the ultrathin skin layer membrane-making solution;
s2, heating a mixed solution of 82% of polytetrafluoroethylene and 18% of a micropore regulator in percentage by weight for 1h at 45-75 ℃, fully stirring, and then carrying out ultrasonic treatment to obtain a microporous layer membrane-making solution;
s3, pouring the ultrathin epidermal layer membrane-forming liquid into a reaction kettle, and carrying out vacuum defoaming for 30min at the temperature of 30-40 ℃;
s4, pouring the ultrathin skin layer membrane-forming liquid into a spinning machine, introducing nitrogen into the spinning machine to pressurize to 0.1-0.3MPa, then opening a spinning pump, controlling the rotating speed to be 20-55r/min, controlling the rotating speed of a core liquid pump to be 15-25r/min, opening a discharge valve, winding ultrathin skin layer fibers sprayed out of a spinning nozzle on a core pipe after passing through a coagulating bath, wherein the temperature of the coagulating bath is 15-25 ℃;
s5, taking down the ultrathin skin layer formed on the core tube, then placing the ultrathin skin layer in the microporous layer membrane-making solution, soaking for 24 hours, and then drying at room temperature to obtain the PVDF/PS hollow fiber electropositive membrane.
Example 3
Please refer to table 1, a PVDF/PS hollow fiber electropositive membrane for a life straw comprises an ultra-thin skin layer and a microporous layer located on the outer surface wall of the ultra-thin skin layer, the wall thickness of the ultra-thin skin layer is 200-600 μm, the wall thickness of the microporous layer is 52-80 μm, the ultra-thin skin layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, the pores of the selective permeation membrane are 0.001-0.1 μm, and the ultra-thin skin layer comprises the following components: 5-9% of polyvinylidene fluoride (PVDF), 8-16% of Polyethersulfone (PES), 15-20% of Polysulfone (PS), 9-13% of Polyacrylonitrile (PAN), 16-20% of polyvinyl chloride (PVC), 13-19% of polypropylene (PP) and 11-30% of Polyethylene (PE), wherein the microporous layer comprises the following components: 82-93% of polytetrafluoroethylene and 7-18% of micropore regulator by weight percentage, wherein the shape of the gap of the micropore layer is spongy or multi-finger;
the preparation method of the PVDF/PS hollow fiber electropositive membrane comprises the following steps:
s1, mixing 9% by weight of polyvinylidene fluoride (PVDF), 16% by weight of polyether sulfone (PES), 18% by weight of Polysulfone (PS), 11% by weight of Polyacrylonitrile (PAN), 20% by weight of polyvinyl chloride (PVC), 15% by weight of polypropylene (PP) and 11% by weight of Polyethylene (PE) solution, heating for 1h at 45-75 ℃, fully stirring and then carrying out ultrasonic treatment to obtain the ultrathin epidermal layer membrane-making solution;
s2, heating a mixed solution of 82% of polytetrafluoroethylene and 18% of a micropore regulator in percentage by weight for 1h at 45-75 ℃, fully stirring, and then carrying out ultrasonic treatment to obtain a microporous layer membrane-making solution;
s3, pouring the ultrathin epidermal layer membrane-forming liquid into a reaction kettle, and carrying out vacuum defoaming for 30min at the temperature of 30-40 ℃;
s4, pouring the ultrathin skin layer membrane-forming liquid into a spinning machine, introducing nitrogen into the spinning machine to pressurize to 0.1-0.3MPa, then opening a spinning pump, controlling the rotating speed to be 20-55r/min, controlling the rotating speed of a core liquid pump to be 15-25r/min, opening a discharge valve, winding ultrathin skin layer fibers sprayed out of a spinning nozzle on a core pipe after passing through a coagulating bath, wherein the temperature of the coagulating bath is 15-25 ℃;
s5, taking down the ultrathin skin layer formed on the core tube, then placing the ultrathin skin layer in the microporous layer membrane-making solution, soaking for 24 hours, and then drying at room temperature to obtain the PVDF/PS hollow fiber electropositive membrane.
Comparative example
Please refer to table 1, a PVDF/PS hollow fiber electropositive membrane for a life straw comprises an ultra-thin skin layer and a microporous layer located on the outer surface wall of the ultra-thin skin layer, the wall thickness of the ultra-thin skin layer is 200-600 μm, the wall thickness of the microporous layer is 52-80 μm, the ultra-thin skin layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, the pores of the selective permeation membrane are 0.001-0.1 μm, and the ultra-thin skin layer comprises the following components: 5-9% of polyvinylidene fluoride (PVDF), 8-16% of Polyethersulfone (PES), 15-20% of Polysulfone (PS), 9-13% of Polyacrylonitrile (PAN), 16-20% of polyvinyl chloride (PVC), 13-19% of polypropylene (PP) and 11-30% of Polyethylene (PE), wherein the microporous layer comprises the following components: 82-93% of polytetrafluoroethylene and 7-18% of micropore regulator by weight percentage, wherein the shape of the gap of the micropore layer is spongy or multi-finger;
the preparation method of the PVDF/PS hollow fiber electropositive membrane comprises the following steps:
s1, mixing 10% by weight of polyvinylidene fluoride (PVDF), 17% by weight of polyether sulfone (PES), 14% by weight of Polysulfone (PS), 8% by weight of Polyacrylonitrile (PAN), 21% by weight of polyvinyl chloride (PVC), 20% by weight of polypropylene (PP) and 10% by weight of Polyethylene (PE) solution, heating for 1h at 45-75 ℃, fully stirring and then carrying out ultrasonic treatment to obtain the ultrathin skin layer membrane-making solution;
s2, heating a mixed solution of 82% of polytetrafluoroethylene and 18% of a micropore regulator in percentage by weight for 1h at 45-75 ℃, fully stirring, and then carrying out ultrasonic treatment to obtain a microporous layer membrane-making solution;
s3, pouring the ultrathin epidermal layer membrane-forming liquid into a reaction kettle, and carrying out vacuum defoaming for 30min at the temperature of 30-40 ℃;
s4, pouring the ultrathin skin layer membrane-forming liquid into a spinning machine, introducing nitrogen into the spinning machine to pressurize to 0.1-0.3MPa, then opening a spinning pump, controlling the rotating speed to be 20-55r/min, controlling the rotating speed of a core liquid pump to be 15-25r/min, opening a discharge valve, winding ultrathin skin layer fibers sprayed out of a spinning nozzle on a core pipe after passing through a coagulating bath, wherein the temperature of the coagulating bath is 15-25 ℃;
s5, taking down the ultrathin skin layer formed on the core tube, then placing the ultrathin skin layer in the microporous layer membrane-making solution, soaking for 24 hours, and then drying at room temperature to obtain the PVDF/PS hollow fiber electropositive membrane.
The following table shows the test results of examples 1, 2, 3, 4 and comparative examples in the same experimental environment:
from the analysis of the test data in the table above, it can be seen that: the PVDF/PS hollow fiber electropositive membrane has stronger anti-pollution performance, and because elements in the PVDF/PS hollow fiber electropositive membrane have stronger negative polarity, the PVDF/PS hollow fiber electropositive membrane is difficult to adsorb organic matters and has good anti-pollution performance; in addition, the PVDF/PS hollow fiber electropositive membrane has higher heat resistance, incombustibility and outstanding corrosion resistance, is not easy to be corroded by strong acid and strong alkali, and can realize the normal recovery of the filament flux of the PVDF/PS hollow fiber electropositive membrane by carrying out chemical cleaning by a cleaning agent, so that the PVDF ultrafiltration membrane filter core can be repeatedly used, and the utilization rate of the PVDF/PS hollow fiber electropositive membrane is improved. The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The PVDF/PS hollow fiber electropositive membrane for the life suction pipe is characterized by comprising an ultrathin epidermal layer and a microporous layer positioned on the outer surface wall of the ultrathin epidermal layer, wherein the ultrathin epidermal layer is a polyvinylidene fluoride hollow fiber ultrafiltration membrane, the microporous layer is a selective permeation membrane, and the pores of the selective permeation membrane are 0.001-0.1 mu m.
2. The PVDF/PS hollow fiber electropositive membrane for a life straw as claimed in claim 1, wherein the composition of said extremely thin skin layer is: 5-9% by weight of polyvinylidene fluoride (PVDF), 8-16% by weight of Polyethersulfone (PES), 15-20% by weight of Polysulfone (PS), 9-13% by weight of Polyacrylonitrile (PAN), 16-20% by weight of polyvinyl chloride (PVC), 13-19% by weight of polypropylene (PP), and 11-30% by weight of Polyethylene (PE).
3. The PVDF/PS hollow fiber electropositive membrane for a life straw as claimed in claim 2, wherein the composition of the microporous layer is: 82-93% of polytetrafluoroethylene and 7-18% of micropore regulator.
4. The PVDF/PS hollow fiber electropositive membrane for a life suction pipe as claimed in claim 1, wherein the shape of the voids of the microporous layer is sponge-like or multi-finger-like.
5. The PVDF/PS hollow fiber electropositive membrane for a life suction tube as claimed in claim 1, wherein the wall thickness of the very thin skin layer is 200-600 μm.
6. The PVDF/PS hollow fiber electropositive membrane for a life straw as claimed in claim 1, wherein the wall thickness of the microporous layer is 52-80 μm.
7. The PVDF/PS hollow fiber electropositive membrane for the life suction pipe as claimed in claim 1, wherein the preparation steps of the PVDF/PS hollow fiber electropositive membrane are as follows:
s1, mixing 5-9 wt% of polyvinylidene fluoride (PVDF), 8-16 wt% of polyether sulfone (PES), 15-20 wt% of Polysulfone (PS), 9-13 wt% of Polyacrylonitrile (PAN), 16-20 wt% of polyvinyl chloride (PVC), 13-19 wt% of polypropylene (PP) and 11-30 wt% of Polyethylene (PE) solution, heating for 1h at 45-75 ℃, and carrying out ultrasonic treatment after full stirring to obtain the ultrathin epidermal layer membrane-making solution;
s2, heating a mixed solution of 82-93 wt% of polytetrafluoroethylene and 7-18 wt% of a micropore regulator for 1h at 45-75 ℃, fully stirring, and performing ultrasonic treatment to obtain a microporous layer membrane-making solution;
s3, pouring the ultrathin epidermal layer membrane-forming liquid into a reaction kettle, and carrying out vacuum defoaming for 30min at the temperature of 30-40 ℃;
s4, pouring the ultrathin skin layer membrane-forming liquid into a spinning machine, introducing nitrogen into the spinning machine to pressurize to 0.1-0.3MPa, then opening a spinning pump, controlling the rotating speed to be 20-55r/min, controlling the rotating speed of a core liquid pump to be 15-25r/min, opening a discharge valve, and winding ultrathin skin layer fibers sprayed out of a spinning nozzle on a core tube after passing through a coagulating bath;
s5, taking down the ultrathin skin layer formed on the core tube, then placing the ultrathin skin layer in the microporous layer membrane-making solution, soaking for 24 hours, and then drying at room temperature to obtain the PVDF/PS hollow fiber electropositive membrane.
8. The PVDF/PS hollow fiber electropositive membrane for a life straw as claimed in claim 1, wherein the temperature of the coagulation bath is 15-25 ℃.
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| CN101703893A (en) * | 2009-11-06 | 2010-05-12 | 江苏朗生生命科技有限公司 | Hollow fiber ultrafiltration composite membrane, preparation method and application thereof |
| US20130213875A1 (en) * | 2010-09-14 | 2013-08-22 | Council Of Scientific & Industrial Research | High flux hollow fiber ultrafiltration membranes and process for the preparation thereof |
| CN102210979A (en) * | 2011-06-17 | 2011-10-12 | 海南立昇净水科技实业有限公司 | Positively charged polyvinyl chloride hollow fiber nanofiltration membrane and preparation method thereof |
| CN102836644A (en) * | 2012-09-06 | 2012-12-26 | 浙江大学 | Method for synchronously preparing hollow fiber compound nanofiltration membrane through immersion precipitation phase inversion/interface crosslinking |
| CN107789986A (en) * | 2016-08-31 | 2018-03-13 | 山东东岳高分子材料有限公司 | Enhanced hollow fiber ultrafiltration membrane and preparation method thereof |
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