CN117753229A - Polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and preparation method thereof - Google Patents
Polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and preparation method thereof Download PDFInfo
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- CN117753229A CN117753229A CN202311794925.3A CN202311794925A CN117753229A CN 117753229 A CN117753229 A CN 117753229A CN 202311794925 A CN202311794925 A CN 202311794925A CN 117753229 A CN117753229 A CN 117753229A
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- bamboo charcoal
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- charcoal fiber
- pvdf hollow
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 71
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 71
- 241001330002 Bambuseae Species 0.000 title claims abstract description 71
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 71
- 239000011425 bamboo Substances 0.000 title claims abstract description 71
- 239000012528 membrane Substances 0.000 title claims abstract description 69
- 239000000835 fiber Substances 0.000 title claims abstract description 68
- 239000003610 charcoal Substances 0.000 title claims abstract description 61
- 239000002033 PVDF binder Substances 0.000 title claims abstract description 57
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 57
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 40
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000003960 organic solvent Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000007731 hot pressing Methods 0.000 claims abstract description 11
- 238000005805 hydroxylation reaction Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 239000010954 inorganic particle Substances 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000003607 modifier Substances 0.000 claims abstract description 5
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 27
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- 244000302661 Phyllostachys pubescens Species 0.000 claims description 3
- 235000003570 Phyllostachys pubescens Nutrition 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 10
- 239000004917 carbon fiber Substances 0.000 abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 10
- 230000004907 flux Effects 0.000 abstract description 4
- 238000000108 ultra-filtration Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 4
- 238000002145 thermally induced phase separation Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000007031 hydroxymethylation reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of ultrafiltration membranes, and discloses a polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and a preparation method thereof, wherein the proportioning is as follows: 5-15% of bamboo carbon fiber, 2-7% of modifier, 15-20% of organic solvent, 1-3% of pore-forming agent, 2-6% of inorganic particles and the balance of PVDF resin, wherein the polyhydroxy bamboo carbon fiber is prepared by hydroxylation reaction of the bamboo carbon fiber, then the polyhydroxy bamboo carbon fiber is prepared into a composite membrane with a PVDF hollow fiber through a hot pressing method, the composite membrane is mixed with an extruder, a film with a certain thickness is prepared through hot-pressing roller compounding and is directly fed into a water washing tank to wash out the pore-forming agent, inorganic particles are sprayed outside to prepare a formed film, the obtained film yarn has slightly poorer surface flatness, the test mechanical property, the tensile strength is 4.98-5.27MPa, the elongation at break is 78-89.3%, the water flux is 150-209.0L/m2.h, and the film yarn of the polyhydroxy bamboo carbon fiber composite PVDF hollow fiber film prepared by the method has the advantages of better elongation at break and higher tensile strength, and brittle fracture is not easy to occur in application.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membranes, in particular to a polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and a preparation method thereof.
Background
PVDF is a membrane material with excellent performance, and hollow fiber microporous membranes developed and produced by taking PVDF as a main material have been successfully applied to the fields of chemical industry, electronics, textile, food, biochemistry and the like.
In the existing industrial production, the NIPS (non-solvent induced phase separation) method is a main method for preparing the PVDF hollow fiber membrane. However, the strength of the hollow fiber membrane prepared by the method is not high, and the strength of the homogeneous membrane (non-reinforcing ribs and woven tubes) is generally below 2 MPa. Another method for preparing PVDF hollow fiber membranes is a TIPS (thermally induced phase separation) method, and the membrane filaments of the PVDF hollow fiber membranes prepared by the TIPS method have poor elongation at break generally, are easy to brittle failure during application, and meanwhile, most of membranes prepared by the TIPS method are microfiltration membranes, so that the requirements of a large number of occasions using ultrafiltration membranes cannot be met.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and a preparation method thereof.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: a polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane comprises the following components in proportion: 5-15% of bamboo charcoal fiber, 2-7% of modifier, 15-20% of organic solvent, 1-3% of pore-forming agent, 2-6% of inorganic particles and the balance of PVDF resin, wherein the bamboo charcoal fiber is subjected to hydroxylation reaction to prepare polyhydroxy bamboo charcoal fiber, then the polyhydroxy bamboo charcoal fiber is mixed with a composite membrane prepared by a PVDF hollow membrane through a hot pressing method through an extruder, and then the mixture is compounded and pressed into a membrane with a certain thickness through a hot pressing roller, the pore-forming agent in the membrane is washed out through a direct water inlet washing tank, and inorganic particles are sprayed outside to prepare the formed membrane.
Preferably, the bamboo carbon fiber is prepared from moso bamboo as a raw material through a new calcining process and a new calcining process with pure oxygen high temperature and nitrogen blocking time delay, and the polyhydroxy bamboo carbon fiber is obtained after the bamboo carbon fiber is crushed, added into a polyvinyl alcohol aqueous solution, stirred, defoamed, metered, coagulated, drawn and shaped, and subjected to hydroxylation reaction.
Preferably, the specific steps of the production of the polyhydroxy bamboo charcoal fiber solution are as follows:
1. pretreatment of bamboo charcoal fibers: cutting bamboo charcoal fibers into regular sheet samples, placing the samples into acetone for ultrasonic cleaning for 30min, then soaking the samples in 10% sodium hydroxide solution for 1h, taking out the samples, washing the samples with clear water for 3-5 times, and airing the samples;
2. hydroxylation reaction: mixing polyvinyl alcohol and an aqueous solution to obtain a mixed solution, and placing the bamboo charcoal fiber sample pretreated in the step 1 into the mixed solution for reaction to obtain the polyhydroxy bamboo charcoal fiber solution.
Preferably, the ultrasonic treatment power is 800-1000w, the cleaning time is 40-50min, the reaction environment is 40-60 ℃ and the time is 9-15 h.
Preferably, the PVDF hollow fiber solution is prepared by the following steps:
PVDF resin, an organic solvent and a pore-forming agent are mixed according to a proportion to form casting film liquid, and vacuum defoamation is carried out for 3-5h.
Preferably, the organic solvent is one or more of N-methylpyrrolidone, N-dimethylacetamide, dimethylformamide and dimethyl sulfoxide;
the pore-forming agent is one or more of polyvinylpyrrolidone, polyethylene glycol, liCl and titanium dioxide.
Preferably, a preparation method of polyhydroxy bamboo carbon fiber composite PVDF hollow fiber membrane,
(a) Mixing: preheating the polyhydroxy bamboo charcoal fiber solution at 40-60 ℃ for 2h, and preheating the PVDF hollow fiber casting film solution at 40-60 ℃ for 2h;
(b) Extrusion stage: injecting the polyhydroxy bamboo charcoal fiber solution, PVDF hollow fiber casting solution, organic solvent and pore-forming agent into an extruder, and mixing in the extruder;
(c) And (3) film preparation: extruding and spinning by an extruder, and compounding and pressing into a film with a certain thickness by a hot-pressing roller;
(d) The cleaning stage, namely directly feeding the composite membrane into a water washing tank to wash out the pore-forming agent in the composite membrane;
(e) And (3) a cooling stage: cooling, and naturally cooling.
(III) beneficial effects
Compared with the prior art, the invention provides a polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and a preparation method thereof, and the polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane has the following beneficial effects:
1. according to the polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and the preparation method, the obtained membrane yarn has the advantages of being flat in surface, slightly poor in test mechanical property, 4.98-5.27MPa in tensile strength, 78-89.3% in elongation at break and 150-209.0L/m & lt 2 & gt h in water flux, and the prepared membrane yarn of the polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane has the advantages of being better in elongation at break, higher in tensile strength and not prone to brittle failure in application.
2. The polyhydroxy bamboo carbon fiber composite PVDF hollow fiber membrane and the preparation method thereof ensure that the composite membrane is fully solidified in the heat preservation stage, ensure that the membrane is evenly plasticized, ensure that all layers of material sheets are fused and combined, and enable the material sheets to be an even and compact whole under the action of pressure, thereby enabling the performance of the finished product to reach the optimal value.
3. According to the polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and the preparation method, PVDF fibers are modified into PVDF fibers with ultrahigh molecular weight, and the technical problem that the reinforced fibers are dissolved by solvents is avoided by utilizing the indissolvable property of the PVDF with ultrahigh molecular weight. In order to improve the flux of the fiber membrane, the hydrophilic modification is creatively carried out on the ultra-high molecular weight PVDF monofilament fiber by using PVA, so that the water flux of the reinforced fiber membrane is obviously improved, and the application potential of the PVDF ultrafiltration membrane is improved.
4. According to the polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and the preparation method, after a proper and proper amount of organic solvent and modifier reaction solution are selected, the PVDF membrane is subjected to surface modification under the ultrasonic condition, so that the purposes of improving the hydrophilicity and pollution resistance of the PVDF membrane can be achieved.
5. The polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and the preparation method thereof are carried out in two steps of fiber pretreatment and hydroxymethylation, and have the advantages of simple operation, short reaction time and milder reaction conditions.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane comprises the following components in proportion: 5-15% of bamboo charcoal fiber, 2-7% of modifier, 15-20% of organic solvent, 1-3% of pore-forming agent, 2-6% of inorganic particles and the balance of PVDF resin, wherein the bamboo charcoal fiber is subjected to hydroxylation reaction to prepare polyhydroxy bamboo charcoal fiber, then the polyhydroxy bamboo charcoal fiber is mixed with a composite membrane prepared by a PVDF hollow membrane through a hot pressing method through an extruder, and then the mixture is compounded and pressed into a membrane with a certain thickness through a hot pressing roller, the pore-forming agent in the membrane is washed out through a direct water inlet washing tank, and inorganic particles are sprayed outside to prepare the formed membrane.
The bamboo charcoal fiber is prepared from moso bamboo serving as a raw material through a new calcining process and a new calcining process with pure oxygen high temperature and nitrogen blocking delay, and is prepared by adding crushed bamboo charcoal fiber into a polyvinyl alcohol aqueous solution, stirring, defoaming, metering, solidifying, drafting and shaping, and carrying out hydroxylation reaction to obtain the polyhydroxy bamboo charcoal fiber.
The specific steps of the production of the polyhydroxy bamboo charcoal fiber solution are as follows:
1. pretreatment of bamboo charcoal fibers: cutting bamboo charcoal fibers into regular sheet samples, placing the samples into acetone for ultrasonic cleaning for 30min, then soaking the samples in 10% sodium hydroxide solution for 1h, taking out the samples, washing the samples with clear water for 3-5 times, and airing the samples;
2. hydroxylation reaction: mixing polyvinyl alcohol and an aqueous solution to obtain a mixed solution, and placing the bamboo charcoal fiber sample pretreated in the step 1 into the mixed solution for reaction to obtain the polyhydroxy bamboo charcoal fiber solution.
The ultrasonic treatment power is 800-1000w, the cleaning time is 40-50min, the reaction environment is 40-60 ℃ and the time is 9-15 h.
The preparation method of the PVDF hollow fiber solution comprises the following steps:
PVDF resin, an organic solvent and a pore-forming agent are mixed according to a proportion to form casting film liquid, and vacuum defoamation is carried out for 3-5h.
The organic solvent is one or more of N-methyl pyrrolidone, N-dimethylacetamide, dimethylformamide and dimethyl sulfoxide;
the pore-forming agent is one or more of polyvinylpyrrolidone, polyethylene glycol, liCl and titanium dioxide.
A preparation method of polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane,
(a) Mixing: preheating the polyhydroxy bamboo charcoal fiber solution at 40-60 ℃ for 2h, and preheating the PVDF hollow fiber casting film solution at 40-60 ℃ for 2h;
(b) Extrusion stage: injecting the polyhydroxy bamboo charcoal fiber solution, PVDF hollow fiber casting solution, organic solvent and pore-forming agent into an extruder, and mixing in the extruder;
(c) And (3) film preparation: extruding and spinning by an extruder, and compounding and pressing into a film with a certain thickness by a hot-pressing roller;
(d) The cleaning stage, namely directly feeding the composite membrane into a water washing tank to wash out the pore-forming agent in the composite membrane;
(e) And (3) a cooling stage: cooling, and naturally cooling.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane is characterized in that: the mixture ratio is as follows: 5-15% of bamboo charcoal fiber, 2-7% of modifier, 15-20% of organic solvent, 1-3% of pore-forming agent, 2-6% of inorganic particles and the balance of PVDF resin, wherein the bamboo charcoal fiber is subjected to hydroxylation reaction to prepare polyhydroxy bamboo charcoal fiber, then the polyhydroxy bamboo charcoal fiber is mixed with a composite membrane prepared by a PVDF hollow membrane through a hot pressing method through an extruder, and then the mixture is compounded and pressed into a membrane with a certain thickness through a hot pressing roller, the pore-forming agent in the membrane is washed out through a direct water inlet washing tank, and inorganic particles are sprayed outside to prepare the formed membrane.
2. The polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane of claim 1, wherein: the bamboo charcoal fiber is prepared from moso bamboo serving as a raw material through a new calcining process and a new calcining process with pure oxygen high temperature and nitrogen blocking delay, and is prepared by adding crushed bamboo charcoal fiber into a polyvinyl alcohol aqueous solution, stirring, defoaming, metering, solidifying, drafting and shaping, and carrying out hydroxylation reaction to obtain the polyhydroxy bamboo charcoal fiber.
3. The polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane according to claim 2, characterized in that: the specific steps of the production of the polyhydroxy bamboo charcoal fiber solution are as follows:
1. pretreatment of bamboo charcoal fibers: cutting bamboo charcoal fibers into regular sheet samples, placing the samples into acetone for ultrasonic cleaning for 30min, then soaking the samples in 10% sodium hydroxide solution for 1h, taking out the samples, washing the samples with clear water for 3-5 times, and airing the samples;
2. hydroxylation reaction: mixing polyvinyl alcohol and an aqueous solution to obtain a mixed solution, and placing the bamboo charcoal fiber sample pretreated in the step 1 into the mixed solution for reaction to obtain the polyhydroxy bamboo charcoal fiber solution.
4. A polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane according to claim 3, characterized in that: the ultrasonic treatment power is 800-1000w, the cleaning time is 40-50min, the reaction environment is 40-60 ℃ and the time is 9-15 h.
5. The polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane of claim 1, wherein: the preparation method of the PVDF hollow fiber solution comprises the following steps:
PVDF resin, an organic solvent and a pore-forming agent are mixed according to a proportion to form casting film liquid, and vacuum defoamation is carried out for 3-5h.
6. The polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane of claim 1, wherein: the organic solvent is one or more of N-methyl pyrrolidone, N-dimethylacetamide, dimethylformamide and dimethyl sulfoxide;
the pore-forming agent is one or more of polyvinylpyrrolidone, polyethylene glycol, liCl and titanium dioxide.
7. A preparation method of a polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane is characterized by comprising the following steps:
(a) Mixing: preheating the polyhydroxy bamboo charcoal fiber solution at 40-60 ℃ for 2h, and preheating the PVDF hollow fiber casting film solution at 40-60 ℃ for 2h;
(b) Extrusion stage: injecting the polyhydroxy bamboo charcoal fiber solution, PVDF hollow fiber casting solution, organic solvent and pore-forming agent into an extruder, and mixing in the extruder;
(c) And (3) film preparation: extruding and spinning by an extruder, and compounding and pressing into a film with a certain thickness by a hot-pressing roller;
(d) The cleaning stage, namely directly feeding the composite membrane into a water washing tank to wash out the pore-forming agent in the composite membrane;
(e) And (3) a cooling stage: cooling, and naturally cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311794925.3A CN117753229A (en) | 2023-12-25 | 2023-12-25 | Polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311794925.3A CN117753229A (en) | 2023-12-25 | 2023-12-25 | Polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN117753229A true CN117753229A (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311794925.3A Pending CN117753229A (en) | 2023-12-25 | 2023-12-25 | Polyhydroxy bamboo charcoal fiber composite PVDF hollow fiber membrane and preparation method thereof |
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| Country | Link |
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| CN (1) | CN117753229A (en) |
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- 2023-12-25 CN CN202311794925.3A patent/CN117753229A/en active Pending
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