CN110548412A - Hydrophilic polypropylene hollow fiber membrane and preparation method thereof - Google Patents
Hydrophilic polypropylene hollow fiber membrane and preparation method thereof Download PDFInfo
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- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
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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
- 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
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- B01D2325/36—Hydrophilic membranes
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Abstract
the invention provides a hydrophilic polypropylene hollow fiber membrane and a preparation method thereof, and relates to the technical field of membrane materials. The preparation method comprises the steps of preparing a casting solution, spinning by a thermally induced phase separation method and post-processing, adding a hydrophilic polymer, an initiator, a polymer, a diluent and a non-diluent into the casting solution, grafting the hydrophilic polymer onto a polypropylene molecular chain in the preparation process of the casting solution by an in-situ polymerization grafting method to form a uniform casting solution, and then preparing the hydrophilic polypropylene hollow fiber membrane by an extruder and a spinning machine, thermal drafting, coagulating bath phase separation, heat treatment, solvent extraction and other methods. The method grafts the hydrophilic polymer to the polypropylene very conveniently by an in-situ reaction method, and the prepared hydrophilic polypropylene hollow fiber membrane has the advantages of obviously improved hydrophilicity, excellent stability, large water flux and difficult pollution.
Description
Technical Field
The invention relates to the technical field of membrane materials, in particular to a hydrophilic polypropylene hollow fiber membrane and a preparation method thereof.
Background
The membrane separation technology is a new and high technology of emerging multidisciplinary intersection in recent decades. The high molecular separating membrane is a membrane prepared from polymer or high molecular composite material and having the function of separating fluid mixture, the membrane separation process is to use the high molecular separating membrane as a separating medium, under the action of one or more driving forces such as pressure difference, concentration difference, potential difference or temperature difference on two sides of the membrane, a certain component on the raw material side selectively permeates through the membrane, and other components are intercepted on the raw material side, so that the purposes of separation, purification and concentration are realized. Membranes are the key to membrane separation processes. The hollow fiber membrane has the advantages of large surface area, no need of a support body for components, equipment miniaturization, simple structure and the like, and is widely applied to the fields of water treatment, food processing and medicine product separation. The polypropylene hollow fiber membrane has the characteristics of good mechanical strength, low cost, easy film formation and the like, and is very widely applied.
But because the polypropylene has lower surface energy and shows strong hydrophobicity, the polypropylene is easy to pollute in the using process, the actual membrane separation process is influenced, the cleaning frequency is increased, and the service life of the membrane is shortened. Therefore, the separation membrane needs to be modified for hydrophilization. Common hydrophilic modification means include both physical blending and chemical modification. Physical blending, that is, a method for obtaining a hydrophilic hollow fiber membrane by melt blending a hydrophilic polymer and polypropylene and performing thermally induced phase separation or melt spinning, for example, in chinese patent CN104689726A, polypropylene, an ethylene-vinyl alcohol copolymer, and polypropylene grafted with maleic anhydride are blended, and are extruded and pelletized by an extruder, and then melt spinning is performed. Physical blending is a simple hydrophilization method, but the hydrophilic agent is dissolved and consumed during the use of the component, and the long-term hydrophilic stability of the component is poor. In order to be able to enhance the bonding strength of the hydrophilic substance and the polypropylene material, a chemical modification is introduced thereto. In chinese patent CN105727769A, acrylic acid is grafted onto the surface of a fiber membrane in polypropylene by means of ultraviolet irradiation to achieve hydrophilization. The polypropylene hollow fiber membrane prepared by the hydrophilization mode has strong hydrophilic stability, but the process is complicated, organic solvent is involved in the modification process, the environment-friendly requirement of industrial production is not facilitated, and meanwhile, the uniformity is relatively poor. In chinese patent CN101966430A, a polyethylene glycol-polypropylene graft polymer is prepared by a chemical reaction and a polymer synthesis process, and then the prepared polypropylene-polyethylene glycol and polypropylene are blended, and melt-drawn and spun to obtain a polyethylene glycol-containing polypropylene separation membrane. Although the hydrophilicity is improved, there are disadvantages that the synthesis reaction is complicated and the industrial implementation is not facilitated. Therefore, it is necessary to develop an efficient, stable and economical method for modifying the hydrophilization of a polypropylene hollow fiber membrane.
Disclosure of Invention
The invention aims to solve the problems and provide a preparation method of a hydrophilic polypropylene hollow fiber membrane, which is characterized in that a hydrophilic polymer is grafted onto polypropylene very conveniently by an in-situ reaction method, and then after spinning and treatment, a hydrophilic substance is exposed on the surface of the membrane, so that hydrophilic modification of a hydrophobic polypropylene membrane is realized, the hydrophilicity of the membrane can be obviously improved, and the membrane has excellent stability, large water flux and is not easy to pollute.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
A preparation method of a hydrophilic polypropylene hollow fiber membrane comprises the following steps:
s1, preparing a casting solution:
dissolving 1-5 parts by weight of a polymerization monomer in 5-20 parts by weight of a lipid non-diluent to prepare a lipid non-diluent, and dissolving 0.001-0.01 part by weight of an oily initiator in 5-10 parts by weight of the lipid diluent to prepare a lipid diluent; then stirring 5-20 parts of lipid non-diluent, 20-50 parts of polypropylene, 35-60 parts of lipid diluent and 0.1-1 part of nucleating agent at 150-210 ℃ for 2-3 hours, adding the lipid diluent, and continuously stirring at 150-210 ℃ for 2-4 hours to form a uniform solution; finally, vacuum defoaming is carried out to form the casting solution.
s2, spinning by thermally induced phase separation method
And (4) extruding the casting solution prepared in the step (S1), spinning the casting solution into hollow fibers through a spinneret plate, performing phase splitting forming at 10-30 ℃ through a coagulating bath, and performing hot drawing and heat treatment to obtain hollow fiber primary yarns.
S3, post-treatment
And (4) adding the hollow fiber primary filament prepared in the step (S2) into the extraction liquid for extraction for 6-24 h, and then carrying out heat setting at 80-140 ℃ for 30-90 min to obtain the hydrophilic polypropylene hollow fiber membrane.
Preferably, in step S1, the polymerized monomer is one or more of methacrylic acid, acrylic acid, methacrylamide, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid.
preferably, in step S1, the lipid non-diluent is one or more of dibutyl phthalate (DBP), triacetin (GTA), dimethylacetamide (DMAc), and Dimethylformamide (DMF).
Preferably, in step S1, the oily initiator is one or more of Azobisisobutyronitrile (AIBN), azobisisoheptonitrile (MSDS), Benzophenone (BP), dibenzoyl peroxide (BPO), dicumyl peroxide (DCP), and di-tert-butyl peroxide (dTBP) initiator.
Preferably, in step S1, the lipid diluent is dioctyl phthalate (DOP), dioctyl sebacate (DOS) or isononyl cyclohexane-1, 2-dicarboxylate (Dinch).
Preferably, in step S1, the polypropylene is homo-polypropylene or high melt strength homo-polypropylene containing branched chains, and the melt index is 0.3 to 4g/10 min; the nucleating agent is a beta-type polypropylene nucleating agent.
Preferably, in step S2, the spinning bore fluid is dioctyl phthalate (DOP), dioctyl sebacate (DOS), cyclohexane-1, 2-dicarboxylic acid isononyl ester (Dinch), and the temperature is 40-140 ℃; the coagulating bath is dioctyl phthalate (DOP), dioctyl sebacate (DOS), cyclohexane-1, 2-dicarboxylic acid isononyl ester (Dinch) or water.
Preferably, in step S2, the hot stretching temperature is 90 to 130 ℃, and the draw ratio is 1/1.5 to 1/4; the heat treatment is carried out at 90-130 ℃ for 30-60 min.
Preferably, in step S3, the extract is an aqueous solution of ethanol with a concentration greater than 80%.
another object of the present invention is to provide a hydrophilic polypropylene hollow fiber membrane, which is manufactured by the above method.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. According to the hydrophilic polypropylene hollow fiber membrane prepared by the invention, a hydrophilic polymer, an initiator, a polymer, a diluent and a non-diluent are added into a membrane casting solution, the hydrophilic polymer is grafted to a polypropylene molecular chain in the preparation process of the membrane casting solution by an in-situ polymerization grafting method to form a uniform membrane casting solution, and then the uniform membrane casting solution is subjected to methods such as a double-screw extruder and a spinning machine, hot drawing, coagulation bath phase splitting, heat treatment and solvent extraction to prepare the hydrophilic polypropylene hollow fiber membrane.
The hydrophilic polymer is grafted to the polypropylene very conveniently by an in-situ reaction method, and then after spinning and treatment, a hydrophilic substance is exposed on the surface of the membrane, so that hydrophilic modification of the hydrophobic polypropylene membrane is realized.
2. The preparation method of the hydrophilic polypropylene hollow fiber membrane has simple process, the hydrophilicity of the prepared polypropylene hollow fiber membrane can be obviously improved, the prepared polypropylene hollow fiber membrane has excellent stability, large water flux and difficult pollution, and can be used for membrane components for sewage treatment, membrane bioreactors and the like.
Drawings
FIG. 1 is an infrared analysis chart of a polypropylene hollow fiber membrane prepared in example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A hydrophilic polypropylene hollow fiber membrane is prepared by the following steps:
s1, preparing a casting solution:
1.5 parts of methacrylic acid was dissolved in 10 parts of DBP, 0.005 part of AIBN was dissolved in 5 parts of DOP, and then the 10 parts of DBP, 20 parts of polypropylene F401 (melt index 2.3g/10min), 50 parts of DOP and 0.5 part of beta-type polypropylene nucleating agent were added to a reaction vessel, stirred at 180 ℃ and 120rpm for 2 hours, then 5 parts of DOP containing an initiator was added to the vessel, and stirring was continued at 180 ℃ and 150rpm for 3 hours to form a uniform solution. Then, vacuum defoaming was performed at 20rpm for 6 hours to form a casting solution.
S2, spinning by thermally induced phase separation method
Adding the membrane casting solution into a double-screw extruder, extruding at 180 ℃, spinning into hollow fibers through a spinneret plate after extrusion, carrying out phase splitting molding on a core solution at 100 ℃ through a Dinch coagulation bath at 25 ℃, and carrying out heat treatment at 130 ℃, 1/2 of a draft ratio and 120 ℃ for 60min to obtain hollow fiber primary yarns;
S3, post-treatment
and adding the prepared hollow fiber primary filament into a 90% ethanol solution for extraction for 24 hours, and finally performing heat setting for 30 minutes at 120 ℃ to obtain the hydrophilic polypropylene hollow fiber membrane.
Example 2
A hydrophilic polypropylene hollow fiber membrane is prepared by the following steps:
S1, preparing a casting solution:
1 part of acrylamide is dissolved in 6 parts of GTA, 20 parts of polypropylene F401 (melt index 2.3g/10min) and 0.4 part of polypropylene nucleating agent are added into a reaction kettle and stirred for 3 hours at 170 ℃ and 120rpm, then 10 parts of Dinch containing initiator is added into the kettle and stirring is continued for 2 hours at 170 ℃ and 160rpm to form a uniform solution. Then, the mixture was vacuum defoamed at 15rpm for 5 hours to form a casting solution.
S2, spinning by thermally induced phase separation method
Adding the membrane casting solution into a double-screw extruder, extruding at 170 ℃, spinning into hollow fibers through a spinneret plate after extrusion, carrying out phase splitting molding on a core solution at 130 ℃ through a water coagulation bath at 25 ℃, carrying out hot drawing at 120 ℃, a drawing ratio of 1/1.5 and heat treatment at 130 ℃ for 70min, and obtaining hollow fiber primary yarns;
S3, post-treatment
And adding the prepared hollow fiber primary filament into a 90% ethanol solution for extraction for 24 hours, and finally performing heat setting for 30 minutes at 120 ℃ to obtain the hydrophilic polypropylene hollow fiber membrane.
Example 3
S1, preparing a casting solution:
2.5 parts of 2-acrylamido-2-methylpropanesulfonic acid was dissolved in 20 parts of DBP, 0.001 part of BP was dissolved in 8 parts of DOP, and then the 20 parts of DBP, 30 parts of polypropylene FY-4012 (melt index 2.5g/10min), 55 parts of DOP and 0.5 part of polypropylene nucleating agent were added to a reaction vessel, and stirred at 180 ℃ and 100rpm for 2 hours, then 10 parts of DOP containing an initiator was added to the vessel, and stirring was continued at 180 ℃ and 150rpm for 4 hours to form a uniform solution. Then, the mixture was vacuum defoamed at 10rpm for 4 hours to form a casting solution.
S2, spinning by thermally induced phase separation method
Adding the casting solution into a double-screw extruder, extruding at 180 ℃, spinning into hollow fibers through a spinneret plate after extrusion, carrying out split-phase forming on a core solution which is DOP at 60 ℃ through a DOP coagulating bath at 25 ℃, and carrying out heat treatment at 100 ℃ and a draft ratio of 1/3 for 30min to obtain hollow fiber primary yarns;
S3, post-treatment
and adding the prepared hollow fiber primary filament into a 95% ethanol solution for extraction for 12 hours, and finally performing heat setting for 30 minutes at 120 ℃ to obtain the hydrophilic polypropylene hollow fiber membrane.
example 4
S1, preparing a casting solution:
2 parts of methacrylamide was dissolved in 12 parts of GTA, 0.01 part of BPO was dissolved in 10 parts of DOP, and then the 12 parts of GTA, 35 parts of polypropylene FY-4012 (melt index 2.5g/10min), 65 parts of DOP and 0.6 part of polypropylene nucleating agent were added to a reaction kettle, and stirred at 160 ℃ and 90rpm for 1.5 hours, then 10 parts of DOP containing an initiator was added to the kettle, and stirring was continued at 160 ℃ and 150rpm for 3 hours to form a uniform solution. Then, the mixture was vacuum defoamed at 15rpm for 3 hours to form a casting solution.
s2, spinning by thermally induced phase separation method
Adding the membrane casting solution into a double-screw extruder, extruding at 160 ℃, spinning into hollow fibers through a spinneret plate after extrusion, carrying out phase splitting molding on a core solution which is DOP at 80 ℃ through a DOP coagulating bath at 30 ℃, and carrying out heat treatment at 110 ℃ and a draft ratio of 1/2 for 50min to obtain hollow fiber primary yarns;
S3, post-treatment
And adding the prepared hollow fiber primary filament into a 95% ethanol solution for extraction for 24 hours, and finally performing heat setting for 60 minutes at the temperature of 110 ℃ to obtain the hydrophilic polypropylene hollow fiber membrane.
Example 5
S1, preparing a casting solution:
1.5 parts of methacrylic acid was dissolved in 12 parts of DMF, 0.005 parts of MSDS was dissolved in 8 parts of DOS, and then the 12 parts of DMF, 45 parts of polypropylene F401 (melt index 2.3g/10min), 50 parts of DOS and 0.4 part of polypropylene nucleating agent were added to the reaction vessel, stirred at 180 ℃ and 120rpm for 2.5 hours, then 12 parts of DOS containing initiator was added to the vessel, and stirring was continued at 180 ℃ and 160rpm for 2 hours to form a homogeneous solution. Then, the mixture was vacuum defoamed at 20rpm for 4 hours to form a casting solution.
S2, spinning by thermally induced phase separation method
adding the casting solution into a double-screw extruder, extruding at 180 ℃, spinning into hollow fibers through a spinneret plate after extrusion, carrying out phase splitting molding on a core solution at 100 ℃ through a DOS coagulating bath at 25 ℃, and carrying out heat drawing at 120 ℃, a drawing ratio of 1/2.5 and heat treatment at 120 ℃ for 30min to obtain hollow fiber primary yarns;
S3, post-treatment
And adding the prepared hollow fiber primary filament into a 90% ethanol solution for extraction for 18 hours, and finally carrying out heat setting for 80 minutes at 120 ℃ to obtain the hydrophilic polypropylene hollow fiber membrane.
Comparative example 1
A hydrophilic polypropylene hollow fiber membrane, step S1, 20 parts of polypropylene F401 (melt index 2.3g/10min), 50 parts of DOP were added to a reaction vessel and stirred at 180 ℃ and 120rpm for 2 hours to form a homogeneous solution. Then, vacuum defoaming was performed at 20rpm for 6 hours to form a casting solution. The other steps are the same as in example 1.
Pure water flux test, porosity test and hydrophilicity test (surface contact angle test) were performed on the membranes of examples 1 to 5 and comparative example 1, and the results are shown in table 1 below.
1. Hydrophilic property test of membrane material
The contact angle test was used for characterization. Cutting the film to be measured into sample strips of 2cm multiplied by 5cm, soaking in absolute ethyl alcohol for 1h, replacing water in the film with ethyl alcohol, taking out, and naturally airing in a closed space. And flatly sticking the dried sample on the surface of the glass slide by using a double-sided adhesive tape, cutting off the uneven part by using a sharp knife to enable the surface of the sample to be as flat as possible, then placing the prepared sample on a platform of a contact angle tester, and sequentially testing contact angles.
2. pure water flux test of membrane material
The test was performed using an ultrafiltration cup, pressurized with nitrogen. The caliber of the ultrafiltration cup is 80 mm. The membrane to be tested is cut into a circular membrane with the diameter of 80mm by scissors, the membrane is placed in an interlayer in the middle of the ultrafiltration cup, a sealing ring is well padded, and a sealing bolt is screwed down to prevent the device from leaking water or air. Then pouring distilled water from the mouth at the upper part of the ultrafiltration cup, wherein the distilled water accounts for 3/4 volume of the ultrafiltration cup (saving nitrogen and reducing nitrogen compression time), then screwing down the cover, opening the nitrogen main valve, rotating the sub-valve again to enable the air pressure of the nitrogen to be about 0.1MPa, then observing the water outlet of the ultrafiltration cup, discharging bubbles in the water outlet, starting timing to measure pure water flux when the water drop speed is uniform, timing for 5min, and measuring the volume of distilled water flowing out of the water outlet for 5 min. Three times for each sample and data were recorded.
The pure water flux is calculated by the formula:
wherein F is the pure water flux of the modified membrane material, Q is the distilled water permeability, r is the mouth diameter of the ultrafiltration cup, and t is the test time.
3. Porosity test of membrane material
The method comprises the steps of selecting a modified polymer film material with a uniform surface, cutting the modified polymer film material into 2cm multiplied by 2cm by adopting a weighing method, marking the cut film, putting the marked film material into distilled water for soaking for one hour, taking out a sample, carefully wiping the liquid on the surface of the film by using a clean rag, quickly weighing the mass of the sample, recording m1, measuring the thickness of the modified polymer film by using a vernier caliper, finally putting the film into absolute ethyl alcohol for soaking for 1 hour, after the soaking is finished, putting the film into a vacuumizing oven for drying at 85 ℃ for 4 hours, putting the dried film into an electronic balance, weighing the mass of the sample, recording m 2, and recording data.
TABLE 1 analysis of the results
| pure water flux/L.m-2·h-1 | Surface contact Angle/° | Porosity/% | |
| Example 1 | 1420 | 74 | 70 |
| example 2 | 1380 | 70 | 65 |
| example 3 | 1240 | 81 | 68 |
| example 4 | 1530 | 69 | 72 |
| Example 5 | 1180 | 82 | 64 |
| comparative example 1 | 0 | 130 | - |
As can be seen from the data of examples 1 to 5, comparative example 1 and Table 1, the hydrophilic polypropylene hollow fiber membrane prepared by the present invention has significantly improved hydrophilicity, excellent stability and large water flux. It can be seen from the infrared analysis chart of fig. 1 that the hydrophilicity of the polypropylene hollow fiber membrane can be stably improved by grafting the hydrophilic polymer onto the polypropylene.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A preparation method of a hydrophilic polypropylene hollow fiber membrane is characterized by comprising the following steps:
S1, preparing a casting solution:
Dissolving 1-5 parts by weight of a polymerization monomer in 5-20 parts by weight of a lipid non-diluent to prepare a lipid non-diluent, and dissolving 0.001-0.01 part by weight of an oily initiator in 5-10 parts by weight of the lipid diluent to prepare a lipid diluent; then stirring 5-20 parts of lipid non-diluent, 20-50 parts of polypropylene, 35-60 parts of lipid diluent and 0.1-1 part of nucleating agent at 150-210 ℃ for 2-3 hours, adding the lipid diluent, and continuously stirring at 150-210 ℃ for 2-4 hours to form a uniform solution; finally, defoaming in vacuum to form a membrane casting solution;
S2, spinning by thermally induced phase separation method
extruding the membrane casting solution prepared in the step S1, spinning the membrane casting solution into hollow fibers through a spinneret plate, performing phase splitting forming at 10-30 ℃ through a coagulating bath, and performing hot drawing and heat treatment to obtain hollow fiber primary yarns;
S3, post-treatment
And (4) adding the hollow fiber primary filament prepared in the step (S2) into the extraction liquid for extraction for 6-24 h, and then carrying out heat setting at 80-140 ℃ for 30-90 min to obtain the hydrophilic polypropylene hollow fiber membrane.
2. The hydrophilic polypropylene hollow fiber membrane and the preparation method thereof according to claim 1, wherein in step S1, the polymerized monomer is one or more of methacrylic acid, acrylic acid, methacrylamide, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid.
3. The method for preparing a hydrophilic polypropylene hollow fiber membrane according to claim 1, wherein in step S1, the lipid non-diluent is one or more of dibutyl phthalate, triacetin, dimethylacetamide and dimethylformamide.
4. The method of claim 1, wherein in step S1, the oily initiator is one or more of azobisisobutyronitrile, azobispimelic cyanide, benzophenone, dibenzoyl peroxide, dicumyl peroxide, and di-t-butyl peroxide.
5. The method for preparing a hydrophilic polypropylene hollow fiber membrane according to claim 1, wherein the lipid diluent is dioctyl phthalate, dioctyl sebacate or isononyl cyclohexane-1, 2-dicarboxylate in step S1.
6. The method for preparing a hydrophilic polypropylene hollow fiber membrane according to claim 1, wherein in step S1, the polypropylene is homo-polypropylene or high melt strength homo-polypropylene containing branched chains, and the melt index is 0.3-4 g/10 min; the nucleating agent is a beta-type polypropylene nucleating agent.
7. The method for preparing a hydrophilic polypropylene hollow fiber membrane according to claim 1, wherein in step S2, the spinning dope is dioctyl phthalate, dioctyl sebacate, cyclohexane-1, 2-dicarboxylic acid isononyl ester, and the temperature is 40-140 ℃; the coagulating bath is dioctyl phthalate, dioctyl sebacate, cyclohexane-1, 2-dicarboxylic acid isononyl ester or water.
8. The method for preparing a hydrophilic polypropylene hollow fiber membrane according to claim 1, wherein in step S2, the hot stretching temperature is 90 to 130 ℃, the draw ratio is 1/1.5 to 1/4; the heat treatment is carried out at 90-130 ℃ for 30-60 min.
9. The method of claim 1, wherein the extraction liquid is an aqueous solution of ethanol with a concentration of greater than 80% in step S3.
10. A hydrophilic polypropylene hollow fiber membrane manufactured by the method for manufacturing a hydrophilic polypropylene hollow fiber membrane according to any one of claims 1 to 9.
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| CN115571976A (en) * | 2022-08-31 | 2023-01-06 | 绿泽源(浙江)环保科技有限公司 | Preparation method of MABR (EHBR) membrane for treating sustainable water of rivers and lakes |
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