CN112226911A - Hydrophilic composite membrane and preparation method thereof - Google Patents
Hydrophilic composite membrane and preparation method thereof Download PDFInfo
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- CN112226911A CN112226911A CN202011000754.9A CN202011000754A CN112226911A CN 112226911 A CN112226911 A CN 112226911A CN 202011000754 A CN202011000754 A CN 202011000754A CN 112226911 A CN112226911 A CN 112226911A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/435—Polyesters
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/009—Condensation or reaction polymers
- D04H3/011—Polyesters
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/02—Moisture-responsive characteristics
- D10B2401/022—Moisture-responsive characteristics hydrophylic
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/13—Physical properties anti-allergenic or anti-bacterial
Abstract
The embodiment of the invention relates to a composite membrane, in particular to a hydrophilic composite membrane and a preparation method thereof, wherein the hydrophilic composite membrane is prepared by electrostatic spinning of a melt-blown fabric substrate by using electrostatic spinning solution; wherein the electrostatic spinning solution is formed by stirring a solute formed by combining polybutylene terephthalate and polyvinyl alcohol and a hexafluoroisopropanol solvent. Compared with the prior art, the hydrophilic composite membrane prepared by the embodiment can also have good hydrophilicity, so that the hydrophilic composite membrane has strong oil stain resistance, and can effectively inhibit bacterial breeding in a long-term humid environment, thereby meeting the use requirements of the filtration fields of biology, medicine and the like, and because the hydrophilic composite membrane of the embodiment has the help of the high-strength characteristic of melt-blown cloth, a reinforcing layer can be omitted, therefore, the production and preparation processes of the composite membrane can be greatly simplified, and meanwhile, the production cost of the hydrophilic composite membrane can also be effectively reduced.
Description
Technical Field
Embodiments of the present invention relate to a composite membrane, and more particularly, to a hydrophilic composite membrane and a method of preparing the same.
Background
The nanofiber membrane prepared by the electrostatic spinning technology has an ultra-large specific surface area and extremely high porosity, the pore diameter of the nanofiber membrane is smaller, the fiber diameter is thinner and can reach the level of micron or even nanometer, and the nanofiber membrane has a good application prospect in the field of filtration.
Disclosure of Invention
The embodiment of the invention aims to provide a hydrophilic composite membrane and a preparation method thereof, which not only enable the prepared hydrophilic composite membrane to have smaller pore diameter, but also enable the prepared hydrophilic composite membrane to have higher strength, good air permeability, flux and hydrophilic performance, and lower preparation cost.
In order to solve the technical problem, an embodiment of the present invention provides a hydrophilic composite membrane, which is prepared by electrospinning a melt-blown fabric substrate with an electrospinning solution;
wherein the electrostatic spinning solution is formed by stirring a solute formed by combining polybutylene terephthalate and polyvinyl alcohol and a hexafluoroisopropanol solvent.
In addition, the embodiment of the invention also provides a preparation method of the hydrophilic composite membrane, which comprises the following steps:
providing a solute comprising polybutylene terephthalate and polyvinyl alcohol, providing a hexafluoroisopropanol solvent, and providing a meltblown substrate;
stirring the solute and the solvent to prepare an electrostatic spinning solution;
carrying out electrostatic spinning on the melt-blown fabric base material by using the obtained electrostatic spinning solution to prepare a composite membrane blank;
and carrying out vacuum drying on the composite film blank to fully volatilize the electrostatic spinning solution on the composite film blank to obtain a composite film finished product.
Compared with the prior art, the hydrophilic composite membrane of the embodiment of the invention has the advantages that the hydrophilic composite membrane takes the melt-blown cloth as the base material, and the melt-blown cloth has the characteristics of small density, small fiber diameter and pore diameter and high porosity, so that the hydrophilic composite membrane of the embodiment has higher strength, meanwhile, the electrostatic spinning solution adopted by the melt-blown cloth base material during electrostatic spinning is prepared by stirring the solute formed by combining polybutylene terephthalate and polyvinyl alcohol and the hexafluoroisopropanol solvent, the polybutylene terephthalate in the solute has good biocompatibility, so that the electrostatic spinning solution can be well contained in the melt-blown cloth base material during spinning, and the polyvinyl alcohol has good biocompatibility and hydrophilicity, so that the hydrophilic composite membrane prepared by the embodiment can also have good hydrophilicity and strong oil stain resistance, the hydrophilic composite membrane can effectively inhibit the breeding of bacteria in a long-term humid environment, thereby meeting the use requirements in the filtration fields of biology, medicine and the like, and the hydrophilic composite membrane of the embodiment has the advantages of saving a reinforcing layer by means of the high-strength characteristic of melt-blown cloth, thereby greatly simplifying the production and preparation process of the composite membrane and effectively reducing the production cost of the hydrophilic composite membrane.
In addition, the concentration of the electrostatic spinning solution accounts for 8 to 22 percent of the hydrophilic composite membrane.
In addition, the mass ratio of the butylene terephthalate and the polyvinyl alcohol in the solute is between 5:1 and 20: 1.
In addition, the polymerization degree of the polyvinyl alcohol is between 200 and 2000.
In addition, the thickness of the melt-blown fabric base material is 50 to 150 mu m, and the gram weight is 10g/m2To 50g/m2。
In addition, the melt-blown fabric base material is a polyester melt-blown nonwoven fabric.
In addition, in the step of preparing the electrospinning solution by stirring the solute and the solvent, the solute and the solvent are stirred by magnetic force to prepare the electrospinning solution.
In addition, in the step of electrospinning the melt-blown fabric substrate with the obtained electrospinning solution, the spinning voltage is 15kv to 40kv, the receiving distance is 5cm to 10cm, and the spinning time is 2min to 30 min.
In addition, in the step of vacuum drying the composite membrane blank, the vacuum drying temperature is 60 ℃ to 90 ℃, and the vacuum drying time is 10h to 24 h.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for preparing a hydrophilic composite membrane according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The first embodiment of the present invention relates to a hydrophilic composite membrane, which is prepared by electrospinning a melt-blown fabric substrate with an electrospinning solution. Wherein the electrostatic spinning solution is formed by stirring a solute formed by combining polybutylene terephthalate and polyvinyl alcohol and a hexafluoroisopropanol solvent.
It can be seen from the above that, the hydrophilic composite membrane of the present embodiment uses the meltblown fabric as the substrate, and the meltblown fabric has the characteristics of small density, small fiber diameter and pore size, and high porosity, so that the hydrophilic composite membrane of the present embodiment has high strength, and meanwhile, the electrostatic spinning solution adopted by the meltblown substrate during electrostatic spinning is prepared by stirring a solute formed by combining polybutylene terephthalate and polyvinyl alcohol, and a hexafluoroisopropanol solvent, and the polybutylene terephthalate in the solute has good biocompatibility, so that the electrostatic spinning solution can be well contained in the meltblown substrate during spinning, and the polyvinyl alcohol has good biocompatibility and hydrophilicity, so that the hydrophilic composite membrane prepared by the present embodiment also has good hydrophilicity and strong anti-oil stain capability, the hydrophilic composite membrane can effectively inhibit bacterial breeding in a long-term humid environment, so that the use requirements in the filtration fields of biology, medicine and the like are met, and meanwhile, the hydrophilic composite membrane of the embodiment has the advantages of being high in strength and saving a reinforcing layer due to the fact that the hydrophilic composite membrane is made of the melt-blown cloth, so that the production and preparation processes of the hydrophilic composite membrane can be greatly simplified, and meanwhile, the production cost of the hydrophilic composite membrane can be effectively reduced.
Specifically, in the present embodiment, the concentration of the electrospinning solution is 8% to 22% in the hydrophilic composite membrane, and the mass ratio between the butylene terephthalate and the polyvinyl alcohol in the solute is 5:1 to 20: 1. The polymerization degree of the polyvinyl alcohol is between 200 and 2000. The thickness of the melt-blown fabric base material is 50-150 mu m, and the gram weight is 10g/m2To 50g/m2. And the melt-blown fabric base material is polyester melt-blown non-woven fabric.
When preparing the composite membrane, a person skilled in the art can weigh PBT with proper weight and select PVA raw material with proper polymerization degree according to different application scenes, stir the PBT raw material with hexafluoroisopropanol with proper volume to prepare electrostatic spinning solution for electrostatic spinning, and select melt-blown cloth with proper thickness as a base material of the electrostatic spinning according to the thickness of the composite membrane to be prepared so as to prepare hydrophilic composite membrane finished products meeting different fields.
A second embodiment of the present invention relates to a method for preparing a hydrophilic composite membrane, as shown in fig. 1, including the steps of:
and 140, carrying out vacuum drying on the composite film blank to fully volatilize the electrostatic spinning solution on the composite film blank to obtain a composite film finished product.
It can be seen from the above that, the hydrophilic composite membrane of the present embodiment uses the meltblown fabric as the substrate, and the meltblown fabric has the characteristics of small density, small fiber diameter and pore size, and high porosity, so that the hydrophilic composite membrane of the present embodiment has high strength, and meanwhile, the electrostatic spinning solution adopted by the meltblown substrate during electrostatic spinning is prepared by stirring a solute formed by combining polybutylene terephthalate and polyvinyl alcohol, and a hexafluoroisopropanol solvent, and the polybutylene terephthalate in the solute has good biocompatibility, so that the electrostatic spinning solution can be well contained in the meltblown substrate during spinning, and the polyvinyl alcohol has good biocompatibility and hydrophilicity, so that the hydrophilic composite membrane prepared by the present embodiment also has good hydrophilicity, so that the hydrophilic composite membrane has strong anti-oil stain capability, and can inhibit the bacterial breeding effectively in the long-term moist environment, thus meet the use demands in the filtration field such as biology, medicine, etc., meanwhile, because the hydrophilic composite membrane of this embodiment has saved the enhancement layer, therefore, can greatly simplify the production and preparation process of the composite membrane, and can also reduce the production cost of the hydrophilic composite membrane effectively at the same time.
Specifically, in the present embodiment, in the step of preparing the electrospinning solution by stirring the solute and the solvent, the electrospinning solution is prepared by magnetically stirring the solute and the solvent. For example, in the preparation of electrospinning solution, the solute and the solvent can be put into a container respectively, and the magnetic stirrer placed in the container is pushed by the magnetic field to perform circular operation by utilizing the principle that like poles repel and opposite poles attract of the magnetic field, so as to achieve the purpose of stirring. Because the magnetic stirring can be matched with a heating temperature control system, the sample temperature during stirring can be heated and controlled according to specific experimental requirements, so that the required temperature condition can be maintained, and the mixing of the solute and the solvent in the finally prepared electrostatic spinning solution can meet other requirements of electrostatic spinning.
Next, in the step of electrospinning the melt-blown fabric substrate with the obtained electrospinning solution, the melt-blown fabric substrate may be electrospun by an electrospinning machine, and thus, a spinning voltage, a receiving distance, and a spinning time of the electrospinning machine need to be set, but in the present embodiment, the spinning voltage may be set to 15kv to 40kv, the receiving distance may be set to 5cm to 10cm, and the spinning time may be set to 2min to 30 min. Finally, in the step of vacuum drying the composite membrane blank, the composite membrane blank can be placed into a vacuum drying oven, the vacuum drying temperature in the vacuum drying oven is set to be 60-90 ℃, and the vacuum drying time is set to be 10-24 h.
According to the preparation method of the hydrophilic composite membrane explained above, in combination with a melt-blown fabric substrate with a specific thickness, in the electrostatic spinning process, an electrostatic spinning solution formed by stirring based on polybutylene terephthalate, polyvinyl alcohol and hexafluoroisopropanol with different contents is used, and an example is given when electrostatic spinning is performed.
Example 1:
firstly, 0.6g of polybutylene terephthalate PBT slice and polyvinyl alcohol PVA solid particles are weighed and placed in 4.29ml of hexafluoroisopropanol solvent, wherein the polymerization degree of the PVA solid particles is 1250, the mass ratio of the PBT slice to the PVA solid particles is 5:1, the PBT slice and the PVA solid particles are magnetically stirred at room temperature until the PBT slice and the PVA solid particles are completely dissolved, and electrostatic spinning liquid with the mass volume ratio of 14% is prepared and used after the electrostatic spinning liquid is defoamed.
And secondly, loading the prepared electrostatic spinning solution into an injection device of an electrostatic spinning machine, and respectively setting the spinning voltage, the receiving distance and the spinning time of the electrostatic spinning machine, wherein the spinning voltage is set to be 24kv, the receiving distance is set to be 6cm, and the spinning time is set to be 10 min.
Next, using a polyester melt-blown nonwoven fabric having a thickness of 60 μm as a receiving substrate, an electrospinning machine was started to start electrospinning.
After spinning is finished, a composite membrane blank is obtained, then the composite membrane blank is placed in a vacuum drying oven at 80 ℃, and the composite membrane blank is dried for 12 hours to prepare the composite membraneAnd (5) obtaining a finished product of the composite film. As shown in the following table, the thickness of the composite film product prepared in this example is 69 μm, and the air permeability of the composite film product is 92.689L/(m)2s) average pore diameter of 10.23 μm and water flux of 0.0272 ml/(cm) under standard atmospheric pressure2s), 5% glucose solution flux of 0.0162 ml/(cm)2s), flux of 40% glucose solution was 0.013 ml/(cm)2s)。
Example 2:
firstly, 1.0g of polybutylene terephthalate PBT slice and polyvinyl alcohol PVA solid particles are weighed and placed in 6.25ml of hexafluoroisopropanol solvent, wherein the polymerization degree of the PVA solid particles is 1750, the mass ratio of the PBT slice to the PVA solid particles is 5:1, the PBT slice and the PVA solid particles are magnetically stirred at room temperature until the PBT slice and the PVA solid particles are completely dissolved, and electrostatic spinning liquid with the mass volume ratio of 16% is prepared and used after the electrostatic spinning liquid is defoamed.
And secondly, loading the prepared electrostatic spinning solution into an injection device of an electrostatic spinning machine, and respectively setting the spinning voltage, the receiving distance and the spinning time of the electrostatic spinning machine, wherein the spinning voltage is set to be 26kv, the receiving distance is set to be 6cm, and the spinning time is set to be 30 min.
Next, using a polyester melt-blown nonwoven fabric having a thickness of 100 μm as a receiving substrate, an electrospinning machine was started to start electrospinning.
And after spinning is finished, obtaining a composite membrane blank, then placing the composite membrane blank in a vacuum drying oven at 70 ℃, and drying the composite membrane blank for 20 hours to obtain a finished composite membrane product. As shown in the following table, the thickness of the composite film product prepared in this example is 128 μm, and the air permeability of the composite film product is 71.124L/(m)2s) with an average pore diameter of 13.64 μm, and a water flux, a 5% glucose solution flux and a 40% glucose solution flux of less than 0.001 ml/(cm) at standard atmospheric pressure2s), water contact angle 20 °.
Example 3:
firstly, 0.6g of polybutylene terephthalate PBT slice and polyvinyl alcohol PVA solid particles are weighed and placed in 3.33ml of hexafluoroisopropanol solvent, wherein the polymerization degree of the PVA solid particles is 500, the mass ratio of the PBT slice to the PVA solid particles is 5:1, the PBT slice and the PVA solid particles are magnetically stirred at room temperature until the PBT solid particles are completely dissolved, and the electrostatic spinning solution with the mass volume ratio of 18% is prepared and used after the electrostatic spinning solution is defoamed.
And secondly, loading the prepared electrostatic spinning solution into an injection device of an electrostatic spinning machine, and respectively setting the spinning voltage, the receiving distance and the spinning time of the electrostatic spinning machine, wherein the spinning voltage is set to be 24kv, the receiving distance is set to be 6cm, and the spinning time is set to be 15 min.
Next, using a polyester melt-blown nonwoven fabric having a thickness of 60 μm as a receiving substrate, an electrospinning machine was started to start electrospinning.
And after spinning is finished, obtaining a composite membrane blank, then placing the composite membrane blank in a vacuum drying oven at 70 ℃, and drying the composite membrane blank for 12 hours to obtain a finished composite membrane product. As can be seen from the following table, the final thickness of the composite film product prepared in this example is 73 μm, and the air permeability of the composite film product is 114.47L/(m)2s) with an average pore diameter of 15.00. mu.m and a water flux of 0.2264 ml/(cm) at standard atmospheric pressure2s), 5% glucose solution flux was 0.1657 ml/(cm)2s), flux of 40% glucose solution was 0.0715 ml/(cm)2s)。
Table one shows the finished composite films prepared in the three examples.
(watch one)
Table two shows the test parameters of air permeability and water flux of the finished composite membrane prepared in the above three examples.
| Examples | Air permeability | Average pore diameter | Water flux at standard atmospheric pressure | Flux of 5% glucose solution | Flux of 40% glucose solution |
| 1 | 92.689L/(m2s) | 10.23μm | 0.0272ml/(cm2s) | 0.0162ml/(cm2s) | 0.013ml/(cm2s) |
| 2 | 71.124L/(m2s) | 13.64μm | <0.001ml/(cm2s) | <0.001ml/(cm2s) | <0.001ml/(cm2s) |
| 3 | 114.47L/(m2s) | 15.00μm | 0.2264ml/(cm2s) | 0.1657ml/(cm2s) | 0.0715ml/(cm2s) |
(watch two)
From the above three examples in combination with tables one and two, it is understood from the comparison between example 1 and example 3 that the smaller the degree of polymerization of PVA used, the smaller the amount of hexafluoroisopropanol solvent. On the contrary, the longer the spinning time, the better the performance parameters of the air permeability, the water flux under the standard atmospheric pressure, the flux of 5% glucose solution and the flux of 40% glucose solution of the prepared composite membrane finished product.
On the other hand, it can be seen from example 2 that, when the degree of polymerization of PVA is about large and the thickness of the meltblown substrate is thicker, the performance parameters of the air permeability, the water flux at the standard atmospheric pressure, the flux of 5% glucose solution and the flux of 40% glucose solution of the finished composite film are worse.
Therefore, when preparing the composite membrane, a person skilled in the art can weigh PBT with proper weight and select PVA raw material with proper polymerization degree according to different application scenes, stir the PBT raw material with proper volume and hexafluoroisopropanol to prepare electrostatic spinning solution for electrostatic spinning, and select melt-blown cloth with proper thickness as a base material for electrostatic spinning according to the thickness of the composite membrane to be prepared so as to prepare hydrophilic composite membrane finished products meeting different fields.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. The hydrophilic composite membrane is characterized in that the hydrophilic composite membrane is prepared by electrostatic spinning of a melt-blown fabric substrate by using electrostatic spinning solution;
wherein the electrostatic spinning solution is formed by stirring a solute formed by combining polybutylene terephthalate and polyvinyl alcohol and a hexafluoroisopropanol solvent.
2. The hydrophilic composite membrane according to claim 1, wherein the concentration of the electrospinning liquid is 8% to 22% in percentage in the hydrophilic composite membrane.
3. The hydrophilic composite membrane according to claim 2, wherein the mass ratio of the butylene terephthalate and the polyvinyl alcohol in the solute is between 5:1 and 20: 1.
4. The hydrophilic composite membrane according to claim 3, wherein the degree of polymerization of the polyvinyl alcohol is between 200 and 2000.
5. The hydrophilic composite membrane of claim 1 wherein the meltblown substrate has a thickness of 50 to 150 μm and a grammage of 10g/m2To 50g/m2。
6. The hydrophilic composite membrane according to any one of claims 1 to 5, wherein the meltblown substrate is a polyester meltblown nonwoven.
7. A preparation method of a hydrophilic composite membrane is characterized by comprising the following steps:
providing a solute comprising polybutylene terephthalate and polyvinyl alcohol, providing a hexafluoroisopropanol solvent, and providing a meltblown substrate;
stirring the solute and the solvent to prepare an electrostatic spinning solution;
carrying out electrostatic spinning on the melt-blown fabric base material by using the obtained electrostatic spinning solution to prepare a composite membrane blank;
and carrying out vacuum drying on the composite film blank to fully volatilize the electrostatic spinning solution on the composite film blank to obtain a composite film finished product.
8. The method of claim 7, wherein the step of preparing the electrospinning solution by stirring the solute and the solvent comprises magnetically stirring the solute and the solvent to prepare the electrospinning solution.
9. The method of claim 7, wherein in the step of electrospinning the melt-blown fabric substrate with the obtained electrospinning solution, a spinning voltage is 15kv to 40kv, a receiving distance is 5cm to 10cm, and a spinning time is 2min to 30 min.
10. The method for preparing a hydrophilic composite membrane according to claim 7, wherein in the step of vacuum-drying the composite membrane blank, the vacuum-drying temperature is 60 ℃ to 90 ℃ and the vacuum-drying time is 10h to 24 h.
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