CN108889141A - A kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane - Google Patents
A kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane Download PDFInfo
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- CN108889141A CN108889141A CN201810926141.4A CN201810926141A CN108889141A CN 108889141 A CN108889141 A CN 108889141A CN 201810926141 A CN201810926141 A CN 201810926141A CN 108889141 A CN108889141 A CN 108889141A
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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
- B01D71/26—Polyalkenes
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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
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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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
- B01D2325/36—Hydrophilic membranes
Abstract
The invention discloses a kind of preparation methods of hydrophilic modified polypropylene hollow fibrous membrane, after hydrophilic polymer and polypropene blended granulation, after preparing polypropylene hollow fiber membrane by the methods of double screw extruder and spinning machine, hot gas spring, coagulating bath split-phase, heat treatment and solvent extraction, crosslinking Treatment is further carried out using polypropylene hollow fiber membrane of the glutaraldehyde to preparation, obtains the polypropylene hollow fiber membrane of the hydrophilic modifying with high stability.Preparation process of the present invention is simple, and hollow-fibre membrane obtained has efficient, lasting hydrophily effect, is less likely to occur to pollute in use, in water process membrane module and field of membrane bioreactor, has preferable separating effect.
Description
Technical field
The present invention relates to technical field of membrane, especially a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane.
Background technique
Membrane separation technique is exactly to pass through pressure difference, concentration difference, electricity in the two sides of film using polymeric membrane for separation as separating medium
Under the one or more motive forces effect such as potential difference or temperature difference, the transmission film for a certain component selection that raw material is surveyed, and other groups
Divide and be trapped in feed side, to realize the purpose of separation, purification and concentration.Because it is moderate and without two with filter process energy consumption
The advantages that secondary pollution, has received widespread attention.Hollow-fibre membrane is an important branch in seperation film field, hollow for preparing
There are many material of tunica fibrosa, including polyolefin, polyether sulfone, polyurethane etc., and wherein polypropylene is since it is with excellent acid and alkali-resistance
Property and thermal insulation, the hollow-fibre membrane preparation process prepared using polypropylene as raw material is simple, cheap, and service performance compared with
It is good, thus by the hollow-fibre membrane of polypropylene material preparation household water process, medical instrument, in terms of obtained it is wide
General application.But since polypropylene surface can be lower, strong hydrophobicity is shown, causes to be easy to happen in use
Pollution, influences actual membrane separating process, to influence the use of polypropylene hollow fiber membrane.
Currently, polypropylene hollow fiber membrane of the preparation with hydrophilicity is the important topic in separation membrane field.Often
Hydrophilic modifying mode includes physical blending and two kinds of chemical modification.Huang little army et al. is in CN 101966430B using poly-
Ethylene glycol is modified monomer, and under acid catalysis, polyethylene glycol is grafted to polypropylene surface by the method for chemical modification, preparation
The polypropylene material of hydrophiling.But preparation process is complicated, synthesizes relatively difficult.Physical blending is used polypropylene and other
Hydrophily high polymer is blended, and is then film-made blend by the way of Thermal inactive or melt spinning.Wu Bin et al. is in CN
It is blended in 103949169A patent using polypropylene, nylon and compatilizer, melt spinning is carried out by extruder.It is total by physics
Mixed mode is a kind of hydrophilization methods of simplicity, but component is in use, and hydrophilic agent can dissolve out, when long
Between hydrophilic stability it is poor.Therefore, it is necessary to develop a kind of polypropylene hollow fiber membrane hydrophiling efficiently, stable, economic
Method of modifying.
Summary of the invention
The purpose of the present invention is overcoming the prior art, a kind of system of hydrophilic modified polypropylene hollow fibrous membrane is provided
Preparation Method, the present invention improve the hydrophily and stability of polypropylene separation membrane by simple process, improve water flux performance.For
Reach above-mentioned purpose, the invention adopts the following technical scheme：A kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane,
It includes the following steps：
(1) polypropylene (PP), ethylene-vinyl alcohol copolymer (EVOH) and polyvinyl alcohol (PVA) are dried in vacuo, with antioxygen
After agent is blended uniformly, by double screw extruder of the draw ratio greater than 40, temperature is squeezed out under the conditions of being 150-230 DEG C and is made
Grain obtains that pellet is blended：It is blended in pellet, the mass percent of PP is 70-90%, and EVOH percentage is 8-20%, PVA percentage
Than for 2-10%, antioxidant percentage is 0.1-1%；
(2) non-diluted dose high of lipid of the low lipid diluent of 45-75 parts of polarity, 0-30 parts of polarity, 20-40 parts are mixed
It closes pellet, 0.1-0.8 portions of nucleating agents, 0.1-0.5 parts of antioxidants to be added in reaction kettle, in 140-210 DEG C, 100-180rpm item
It is stirred 2-6 hours under part, forms uniform solution；Then vacuum defoamation 1-12 hours under the conditions of 5-20rpm, casting solution is obtained；
Casting solution is added in double screw extruder, squeezed out at 150-230 DEG C and doughnut, core liquid temperature are spun by spinneret
It is 40-120 DEG C, by 10-30 DEG C of split-phase of coagulating bath, then by 90- after 90-140 DEG C of hot gas spring, draw ratio 1/1.5-1/3
It is heat-treated 30-90min at 140 DEG C, obtains doughnut；90% or more ethanol solution of the doughnut of preparation is extracted into 6-
24 hours, finally the thermal finalization 30-60min at 90-140 DEG C, obtained polypropylene hollow fiber membrane；
(3) polypropylene hollow fiber membrane is then impregnated into 30-120min in 30-90 DEG C of crosslinker solution, washing and drying obtains
To the polypropylene hollow fiber membrane of hydrophiling.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the PP material is
Homopolypropylene, or the high solution intensity homopolypropylene containing branch, melt index 0.3-4g/10min.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the EVOH copolymerization
Ethylene contents are 32% in object, melt index 1.6-2.8g/10min.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the PVA degree of polymerization
For 50-300.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the antioxidant
For one or more of antioxidant 1010, antioxidant 168 and antioxidant B225.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the polarity is low
Lipid diluent is dioctyl phthalate (DOP) or the different nonyl ester (Dinch) of hexamethylene -1,2- dioctyl phthalate.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the polarity is high
Non-diluted dose of lipid is dibutyl phthalate (DBP) or glyceryl triacetate (GTA).
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the nucleating agent is β
Nucleating agent.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the spinning core liquid
For DOP or Dinch, temperature is 40-140 DEG C.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the coagulating bath is
DOP, Dinch or water.
In a kind of preparation method of above-mentioned hydrophilic modified polypropylene hollow fibrous membrane, it is preferable that the crosslinker solution
For the aqueous solution of glutaraldehyde, concentration 0.5-5%, wherein concentration of hydrochloric acid is 0.5-5%.
Compared with prior art, it is of the invention by being blended with hydrophile copolymers after, obtained after spinning and processing
Hydrophilic polymer is very easily fixed on polypropylene hollow fiber membrane table using the mode of crosslinking by hollow-fibre membrane
Face, realizes the hydrophilic modification for hydrophobic polypropylene film, while polymer is during cross-linking reaction, film strength into
One step improves, while hydrophilic layer is more stable.Present invention process is simple, and makes the hydrophily of polypropylene hollow fiber ultrafiltration membrane
Fabulous stability can be significantly improved and have, water flux is big, is not susceptible to pollute.
Detailed description of the invention
Fig. 1 is the electron microscope of polypropylene hollow fiber ultrafiltration membrane prepared by embodiment 1.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
And it is not limited to the scope of the present invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can equally fall within the restriction model of the application the appended claims to the various changes of the present invention or modification, such equivalent forms
It encloses.
Embodiment 1：
Referring to Fig.1, (1) is by PP (melt index 2.3g/10min), EVOH (melt index 1.6g/10min) and PVA-100
Vacuum drying, is blended with antioxidant 1010 uniformly after, by draw ratio be greater than 40 double screw extruder in, temperature 150
Extruding pelletization under the conditions of DEG C obtains that pellet is blended：It is blended in pellet, the mass percent of PP is that 85%, EVOH percentage is
12%, PVA percentage are 3%, and antioxidant percentage is 0.1%；
(2) 65 parts of DOP, 20 parts of GTA, 30 parts of mixing pellets, 0.5 part of beta nucleater, 0.1 part of antioxidant 1010 are added
Enter in reaction kettle, stirred 4 hours under the conditions of 150 DEG C, 120rpm, forms uniform solution；Then vacuum is de- under the conditions of 20rpm
Bubble 4 hours, obtains casting solution；Casting solution is added in double screw extruder, at 180 DEG C squeezes out and is spun by spinneret
Hollow fiber, DOP core liquid temperature is 90 DEG C, by 25 DEG C of split-phases of DOP coagulating bath, then after 120 DEG C of hot gas springs, draw ratio 1/1.5
By being heat-treated 30min at 120 DEG C, doughnut is obtained；The doughnut of preparation is small with 90% ethanol solution extraction 6
When, finally the thermal finalization 30min at 120 DEG C, obtains polypropylene hollow fiber membrane；
(3) subsequent crosslinker solution (glutaraldehyde concentration 1%, the wherein concentration of hydrochloric acid by polypropylene hollow fiber membrane at 60 DEG C
60min is impregnated to be 2%) middle, washing and drying obtains the polypropylene hollow fiber membrane of hydrophiling.
The hollow-fibre membrane that above-mentioned steps are worth to be tested, surface contact angle is 72 °, porosity 68%,
Pure water flux is 1320L/ (m under 0.1MPa2·h)。
Embodiment 2：
(1) PP (melt index 2.3g/10min), EVOH (melt index 2.8g/10min) and PVA-100 vacuum is dry
It is dry, after being blended with antioxidant 1010 uniformly, by double screw extruder of the draw ratio greater than 40, temperature is 160 DEG C of conditions
Lower extruding pelletization obtains that pellet is blended：It is blended in pellet, the mass percent of PP is that 80%, EVOH percentage is 15%, PVA
Percentage is 4.5%, and antioxidant percentage is 0.5%；
(2) by 70 parts of Dinch, 15 parts of GTA, 25 parts of mixing pellets, 0.5 part of beta nucleater, 0.5 part of antioxidant 1010
It is added in reaction kettle, is stirred 3 hours under the conditions of 160 DEG C, 100rpm, form uniform solution；Then vacuum under the conditions of 15rpm
Deaeration 3 hours, obtain casting solution；Casting solution is added in double screw extruder, squeezed out at 170 DEG C and is spun by spinneret
Doughnut, Dinch core liquid temperature is 100 DEG C, by 25 DEG C of split-phases of water coagulating bath, then through 130 DEG C of hot gas springs, draw ratio 1/
By being heat-treated 45min at 130 DEG C after 2.5, doughnut is obtained；95% ethanol solution of the doughnut of preparation is extracted
6 hours, finally the thermal finalization 45min at 130 DEG C, obtained polypropylene hollow fiber membrane；
(3) then by polypropylene hollow fiber membrane, in 70 DEG C of crosslinker solution, (glutaraldehyde concentration 0.5%, wherein hydrochloric acid is dense
Degree impregnates 50min to be 1%) middle, and washing and drying obtains the polypropylene hollow fiber membrane of hydrophiling.
The hollow-fibre membrane that above-mentioned steps are worth to be tested, surface contact angle is 75 °, porosity 72%,
Pure water flux is 1460L/ (m under 0.1MPa2·h)。
Embodiment 3：
(1) PP (melt index 2.8g/10min), EVOH (melt index 1.6g/10min) and PVA-300 vacuum is dry
It is dry, be blended with antioxidant 168 uniformly after, by draw ratio greater than 40 double screw extruder in, temperature be 165 DEG C under the conditions of
Extruding pelletization obtains that pellet is blended：It is blended in pellet, the mass percent of PP is that 82%, EVOH percentage is 12%, PVA hundred
Divide than being 6%, antioxidant percentage is 0.2%；
(2) 50 parts of DOP, 20 parts of DBP, 35 parts of mixing pellets, 0.5 part of beta nucleater, 0.1 part of antioxidant 168 are added
It in reaction kettle, is stirred 4 hours under the conditions of 180 DEG C, 140rpm, forms uniform solution；Then vacuum defoamation under the conditions of 10rpm
2 hours, obtain casting solution；Casting solution is added in double screw extruder, squeezes out and is spun by spinneret hollow at 165 DEG C
Fiber, DOP core liquid temperature be 80 DEG C, by 25 DEG C of split-phases of water coagulating bath, then after 140 DEG C of hot gas springs, draw ratio 1/2 by
It is heat-treated 30min at 140 DEG C, obtains doughnut；By the doughnut of preparation with 95% ethanol solution extract 10 hours, most
The thermal finalization 35min at 140 DEG C afterwards obtains polypropylene hollow fiber membrane；
(3) then by polypropylene hollow fiber membrane, in 45 DEG C of crosslinker solution, (glutaraldehyde concentration 0.8%, wherein hydrochloric acid is dense
Degree impregnates 35min to be 1.2%) middle, and washing and drying obtains the polypropylene hollow fiber membrane of hydrophiling.
The hollow-fibre membrane that above-mentioned steps are worth to be tested, surface contact angle is 73 °, porosity 69%,
Pure water flux is 1410L/ (m under 0.1MPa2·h)。
Embodiment 4：
(1) PP (melt index 2.3g/10min), EVOH (melt index 1.6g/10min) and PVA-300 vacuum is dry
It is dry, after being blended with antioxidant B225 uniformly, by double screw extruder of the draw ratio greater than 40, temperature is 180 DEG C of conditions
Lower extruding pelletization obtains that pellet is blended：It is blended in pellet, the mass percent of PP is that 75%, EVOH percentage is 20%, PVA
Percentage is 5%, and antioxidant percentage is 0.1%；
(2) 50 parts of DOP, 18 parts of GTA, 32 parts of mixing pellets, 0.3 part of beta nucleater, 0.1 part of antioxidant B225 are added
Enter in reaction kettle, stirred 4 hours under the conditions of 150 DEG C, 120rpm, forms uniform solution；Then vacuum is de- under the conditions of 20rpm
Bubble 4 hours, obtains casting solution；Casting solution is added in double screw extruder, at 180 DEG C squeezes out and is spun by spinneret
Hollow fiber, DOP core liquid temperature is 100 DEG C, by 20 DEG C of split-phases of GTA coagulating bath, then after 150 DEG C of hot gas springs, draw ratio 1/1.5
By being heat-treated 30min at 150 DEG C, doughnut is obtained；The doughnut of preparation is small with 90% ethanol solution extraction 12
When, finally the thermal finalization 35min at 150 DEG C, obtains polypropylene hollow fiber membrane；
(3) then by polypropylene hollow fiber membrane, in 80 DEG C of crosslinker solution, (glutaraldehyde concentration 0.3%, wherein hydrochloric acid is dense
Degree impregnates 60min to be 0.8%) middle, and washing and drying obtains the polypropylene hollow fiber membrane of hydrophiling.
The hollow-fibre membrane that above-mentioned steps are worth to be tested, surface contact angle is 68 °, porosity 75%,
Pure water flux is 1500L/ (m under 0.1MPa2·h)。
Claims (11)
1. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane comprising following steps：
(1) polypropylene (PP), ethylene-vinyl alcohol copolymer (EVOH) and polyvinyl alcohol (PVA) are dried in vacuo, with antioxidant
After being blended uniformly, by double screw extruder of the draw ratio greater than 40, temperature is extruding pelletization under the conditions of 150-230 DEG C, obtain
To blending pellet：It is blended in pellet, the mass percent of PP is 70-90%, and EVOH percentage is 8-20%, and PVA percentage is
2-10%, antioxidant percentage are 0.1-1%；
(2) non-diluted dose, 20-40 parts mangcorns of lipid that the low lipid diluent of 45-75 parts of polarity, 0-30 parts of polarity is high
Material, 0.1-0.8 portions of nucleating agents, 0.1-0.5 parts of antioxidants are added in reaction kettle, under the conditions of 140-210 DEG C, 100-180rpm
Stirring 2-6 hours forms uniform solution；Then vacuum defoamation 1-12 hours under the conditions of 5-20rpm, casting solution is obtained；It will casting
Film liquid is added in double screw extruder, is squeezed out at 150-230 DEG C and is spun doughnut by spinneret, core liquid temperature is
40-120 DEG C, by 10-30 DEG C of split-phase of coagulating bath, then by 90-140 after 90-140 DEG C of hot gas spring, draw ratio 1/1.5-1/3
It is heat-treated 30-90min at DEG C, obtains doughnut；90% or more ethanol solution of the doughnut of preparation is extracted into 6-24
Hour, finally the thermal finalization 30-60min at 90-140 DEG C, obtains polypropylene hollow fiber membrane；
(3) polypropylene hollow fiber membrane is then impregnated into 30-120min in 30-90 DEG C of crosslinker solution, washing and drying obtains parent
The polypropylene hollow fiber membrane of aquation.
2. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating PP material is homopolypropylene, or the high solution intensity homopolypropylene containing branch, melt index 0.3-4g/10min.
3. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating ethylene contents in EVOH copolymer is 32%, melt index 1.6-2.8g/10min.
4. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating the PVA degree of polymerization is 50-300.
5. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant B225.
6. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating the low lipid diluent of polarity is dioctyl phthalate (DOP) or the different nonyl ester (Dinch) of hexamethylene -1,2- dioctyl phthalate.
7. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Non-diluted dose of the high lipid of polarity is stated as dibutyl phthalate (DBP) or glyceryl triacetate (GTA).
8. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating nucleating agent is beta nucleater.
9. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that institute
Stating spinning core liquid is DOP or Dinch, and temperature is 40-140 DEG C.
10. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that
The coagulating bath is DOP, Dinch or water.
11. a kind of preparation method of hydrophilic modified polypropylene hollow fibrous membrane according to claim 1, which is characterized in that
The crosslinker solution is the aqueous solution of glutaraldehyde, and concentration 0.5-5%, wherein concentration of hydrochloric acid is 0.5-5%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548412A (en) * | 2019-09-18 | 2019-12-10 | 山东华象环保科技有限公司 | Hydrophilic polypropylene hollow fiber membrane and preparation method thereof |
| CN110917908A (en) * | 2019-10-11 | 2020-03-27 | 贵州理工学院 | Hydrophilic polymer composite hollow fiber membrane with double microporous structures and preparation method thereof |
| CN111748908A (en) * | 2020-07-13 | 2020-10-09 | 杭州米娅纺织品有限公司 | Hydrophilic melt-blown fabric and preparation method thereof |
| CN112717708A (en) * | 2020-12-09 | 2021-04-30 | 江西爱科道环境科技发展有限公司 | Preparation method of hydrophilic polypropylene hollow fiber microporous membrane |
| CN115010214A (en) * | 2022-06-30 | 2022-09-06 | 成都美富特膜环保科技有限公司 | Sewage treatment membrane, preparation method of sewage treatment membrane and membrane separation equipment |
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| CN103933880A (en) * | 2014-03-24 | 2014-07-23 | 贵州省材料产业技术研究院 | Preparation method of high-throughput hydrophilic modified polypropylene hollow fiber membrane |
| CN104689726A (en) * | 2015-03-20 | 2015-06-10 | 东华大学 | Method for preparing hydrophilic modified polypropylene hollow fiber membrane |
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2018
- 2018-08-15 CN CN201810926141.4A patent/CN108889141A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103933880A (en) * | 2014-03-24 | 2014-07-23 | 贵州省材料产业技术研究院 | Preparation method of high-throughput hydrophilic modified polypropylene hollow fiber membrane |
| CN104689726A (en) * | 2015-03-20 | 2015-06-10 | 东华大学 | Method for preparing hydrophilic modified polypropylene hollow fiber membrane |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548412A (en) * | 2019-09-18 | 2019-12-10 | 山东华象环保科技有限公司 | Hydrophilic polypropylene hollow fiber membrane and preparation method thereof |
| CN110917908A (en) * | 2019-10-11 | 2020-03-27 | 贵州理工学院 | Hydrophilic polymer composite hollow fiber membrane with double microporous structures and preparation method thereof |
| CN111748908A (en) * | 2020-07-13 | 2020-10-09 | 杭州米娅纺织品有限公司 | Hydrophilic melt-blown fabric and preparation method thereof |
| CN112717708A (en) * | 2020-12-09 | 2021-04-30 | 江西爱科道环境科技发展有限公司 | Preparation method of hydrophilic polypropylene hollow fiber microporous membrane |
| CN112717708B (en) * | 2020-12-09 | 2023-01-13 | 江西爱科道环境科技发展有限公司 | Preparation method of hydrophilic polypropylene hollow fiber microporous membrane |
| CN115010214A (en) * | 2022-06-30 | 2022-09-06 | 成都美富特膜环保科技有限公司 | Sewage treatment membrane, preparation method of sewage treatment membrane and membrane separation equipment |
| CN115010214B (en) * | 2022-06-30 | 2024-03-29 | 成都美富特膜环保科技有限公司 | Sewage treatment membrane, preparation method of sewage treatment membrane and membrane separation equipment |
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