CN108579445B - Porous membrane diluent extraction device, extraction method and porous membrane preparation method - Google Patents
Porous membrane diluent extraction device, extraction method and porous membrane preparation method Download PDFInfo
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- CN108579445B CN108579445B CN201810304689.5A CN201810304689A CN108579445B CN 108579445 B CN108579445 B CN 108579445B CN 201810304689 A CN201810304689 A CN 201810304689A CN 108579445 B CN108579445 B CN 108579445B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D67/0002—Organic membrane manufacture
- B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
- B01D67/003—Organic membrane manufacture by inducing porosity into non porous precursor membranes by selective elimination of components, e.g. by leaching
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Abstract
The invention discloses a porous membrane diluent extraction device, which comprises an extraction tank, a rinsing tank, a plurality of guide rollers and a transmission structure, wherein the guide rollers are arranged in the extraction tank and the rinsing tank; the extraction tank and the rinsing tank are respectively provided with an extraction liquid and a rinsing liquid; the auxiliary extraction structure comprises at least one group of auxiliary extraction components, each auxiliary extraction component comprises a porous hollow roller arranged in the extraction tank and a driving structure for driving liquid in the porous hollow roller to be sprayed out from the upper through hole of the porous hollow roller; wherein, the extraction tank is internally provided with at least one group of auxiliary extraction components which are arranged close to the outlet direction of the porous membrane; the porous hollow roller sprays the extraction liquid through the through holes under the action of driving force, and a part of extraction liquid washes out the diluent in the micropores of the porous membrane from the lower part of the porous hollow roller, so that the extraction efficiency is improved; the other part of the extraction liquid is flushed out from the upper part of the porous hollow roller, so that the extraction liquid is changed into turbulent flow from advection, and the diffusion speed of the diluent in the extraction liquid is improved.
Description
Technical Field
The invention relates to the technical field of porous membrane preparation, in particular to a porous membrane diluent extraction device, an extraction method and a porous membrane preparation method at the later stage of a porous membrane preparation process.
Background
In the prior art, a thermal phase separation method is generally adopted to prepare a microporous membrane or a porous membrane, and the method comprises the steps of forming a homogeneous solution by a polymer and a diluent with high boiling point and low molecular weight at a high temperature, reducing the temperature to carry out solid-liquid phase separation or liquid-liquid phase separation, and then removing the diluent to form the polymer porous membrane. This method of driving phase separation by temperature change is called thermally induced phase separation. The thermally induced phase separation method mainly comprises 5 steps of preparation of polymer-diluent homogeneous phase solution, preparation of a membrane prototype, cooling, diluent removal, extractant removal and the like.
As disclosed in the prior art are a method for preparing a high-performance ultra-high molecular weight polyethylene porous membrane by a thermally induced phase separation method, and an ethylene-tetrafluoroethylene copolymer porous membrane by a thermally induced phase separation method; in all of the above publications, an extractant is used to extract the diluent in the membrane, thereby obtaining the desired porous membrane.
At present, the extraction process mainly comprises the steps of soaking a diaphragm in an extracting agent, and extracting the diluting agent by adopting a plurality of groups of extraction tanks; the principle of the extraction mode is mainly to achieve the purpose of extraction through the free diffusion of the diluent in the extractant. However, the extraction method cannot extract the diluent in the porous micro-pores efficiently, and the diluent is re-precipitated in the porous micro-channels in the subsequent water washing process, so that the quality of the product is affected. Under the existing process conditions, there are two main methods for improving extraction efficiency: firstly, increasing the extraction temperature; secondly, a plurality of groups of extraction tanks are adopted, and the dosage of an extractant is increased; however, most of the extractants are volatile organic solvents which have toxicity, so that it is difficult to completely extract the diluent by increasing the extraction temperature, and the method of increasing the number of extraction tanks or the amount of the extractant increases the production cost.
Therefore, it is desirable to provide an apparatus for extracting a porous membrane diluent, an extraction method, and a method for producing a porous membrane, which are capable of efficient extraction without increasing the temperature and without increasing the number of extraction tanks and the amount of an extractant.
Disclosure of Invention
Therefore, the invention provides a porous membrane diluent extraction device which comprises an extraction tank, a rinsing tank, a plurality of guide rollers and a transmission structure, wherein the guide rollers are arranged in the extraction tank and the rinsing tank and are vertically spaced; wherein the extraction tank is internally provided with an extraction liquid, and the rinsing tank is internally provided with rinsing liquid; the auxiliary extraction structure comprises at least one group of auxiliary extraction components, and each auxiliary extraction component comprises a porous hollow roller arranged in the extraction tank and a driving structure for driving liquid in the porous hollow roller to be sprayed out from a through hole on the porous hollow roller; wherein, be equipped with at least a set of in the extraction tank and assist the extraction subassembly, just assist the extraction subassembly and be close to the play groove direction setting of porous membrane.
At least one group of auxiliary extraction assemblies is arranged in the rinsing bath, and the auxiliary extraction assemblies are arranged in the direction close to the outlet of the porous membrane.
The driving structure is a hydraulic pump arranged outside the porous hollow roller, and the hydraulic pump is communicated with the inner cavity of the porous hollow roller through a pipeline.
And the plurality of through holes on the porous hollow roller are distributed in an array along the length direction.
On the basis, the invention further provides a porous membrane diluent extraction method, which comprises the following operation methods:
s1, enabling the porous membrane containing the diluent to enter the extraction tank under the action of a driving force and to be driven around a guide roller in the extraction tank, extracting the diluent on the porous membrane immersed in the extraction liquid, and enabling a porous hollow roller in the extraction tank to spray the extraction liquid under the action of the driving force to flush the porous membrane driven around the porous membrane or form turbulent extraction liquid above the porous hollow roller, so that the porous membrane containing the extraction liquid is obtained;
and S2, allowing the porous membrane containing the extract to enter a water washing tank from the extraction tank under the action of a transmission force and to be transmitted around a guide roller in the water washing tank, and dissolving the extract on the porous membrane immersed in the water washing liquid into the water washing liquid to obtain the required porous membrane.
S2 further includes the following operations: before the porous membrane is driven to flow out of the washing tank, the porous hollow roller arranged in the washing tank and close to the direction of the porous membrane outlet sprays washing liquid under the action of driving force, and the porous membrane driven around the porous membrane is washed or turbulent washing liquid is formed above the porous hollow roller.
On the basis, the invention further provides a porous membrane preparation method, which comprises the following steps:
step one, uniformly mixing a polymer, a diluent and an additive, heating at a temperature higher than the melting point or the glass transition temperature of the polymer to form a melt, extruding the melt from a die head through twin-screw extrusion, and cooling at a certain temperature on a cooling roller to prepare a polymer sheet;
step two, stretching the polymer sheet to form a porous membrane with uniform thickness and containing a diluent, and extracting the porous membrane with the diluent by using the diluent to obtain the required porous membrane;
in step two, the diluent-containing porous membrane is subjected to a diluent extraction treatment using the porous membrane diluent extraction method described above.
The polymer is one or more of polyethylene and its copolymer, polypropylene and its copolymer, polyvinylidene fluoride, chitosan, polymethyl methacrylate, cellulose, polyvinyl nitrile, polyaniline, polyvinyl chloride and polyvinyl alcohol.
The diluent is one or more of liquid paraffin, diphenyl ether, diisodecyl phthalate, methyl salicylate, diphenyl ether, diphenylmethane, camphene, soybean oil, glyceryl triacetate, acetic acid, dioctyl phthalate, tetramethylene sulfone, tertiary butanol, cyclohexanol and diethyl malonic acid.
The additive is set as one or more of a foaming agent, a nucleating agent or an oxidizing agent.
Compared with the prior art, the invention has the following advantages:
in the invention, after the porous membrane containing the diluent enters the extraction tank, the diluent is extracted by the extraction liquid, so that most of the diluent on the porous membrane is separated from the porous membrane; meanwhile, before the porous membrane is driven out of the extraction tank, the porous hollow roller of the auxiliary extraction structure sprays extraction liquid through the through holes under the driving force of the driving structure, wherein a part of the extraction liquid is flushed out from the lower part of the porous hollow roller, and because the lower part of the porous hollow roller is covered by the porous membrane, the part of the extraction liquid passes through the micropores on the porous membrane under pressure to flush out the diluent in the micropores of the porous membrane, so that the extraction efficiency of the porous membrane in the extraction process is improved, and the other part of the extraction liquid is flushed out from the upper part of the porous hollow roller, so that the flow mode of the extraction liquid is changed from advection to turbulence, and the diffusion speed of the diluent in the extraction liquid is improved; in conclusion, the porous membrane diluent extraction device provided by the invention has high extraction efficiency, simple structure and low production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a porous membrane diluent extraction device according to the present invention;
FIG. 2 is a schematic structural view of a porous hollow roll according to the present invention;
description of reference numerals: 1-a porous membrane; 2-a rinsing bath; 3-a porous hollow roll; 4-a guide roller; 5-an extraction tank.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a porous membrane diluent extraction apparatus, which includes an extraction tank 5, a rinsing tank 2, a plurality of guide rollers 4 installed in the extraction tank 5 and the rinsing tank 2 and spaced up and down, and a transmission structure for driving a porous membrane 1 around the guide rollers 4; wherein the extraction tank 5 is internally provided with an extraction liquid, and the rinsing tank 2 is internally provided with rinsing liquid; the device also comprises an auxiliary extraction structure, wherein the auxiliary extraction structure comprises at least one group of auxiliary extraction components, and each auxiliary extraction component comprises a porous hollow roller 3 arranged in the extraction tank 5 and a driving structure for driving liquid in the porous hollow roller 3 to be sprayed out from a through hole on the porous hollow roller; wherein, be equipped with at least a set of in extraction tank 5 auxiliary extraction subassembly, and auxiliary extraction subassembly is close to the play groove direction setting of porous membrane 1.
Specifically, in the present embodiment, the guide roller 4 in the extraction tank 5 and the guide roller 4 in the rinse tank 2 are arranged at an interval in the vertical direction in an "N" -shaped arrangement; in a preferred embodiment, only one set of auxiliary extraction modules is provided in the extraction tank 5, and the auxiliary extraction modules are located in the direction of the outlet of the porous membrane 1 with respect to the guide roller 4 in the extraction tank 5.
In this embodiment, after the porous membrane 1 containing the diluent enters the extraction tank 5, the extraction liquid will extract the diluent, so that most of the diluent on the porous membrane 1 is separated from the porous membrane 1; meanwhile, before the porous membrane 1 is driven out of the extraction tank 5, the porous hollow roller 3 of the auxiliary extraction structure sprays extraction liquid through a through hole under the driving force of a driving structure, wherein a part of the extraction liquid is flushed out from the lower part of the porous hollow roller 3, because the lower part of the porous hollow roller 3 is covered by the porous membrane 1, the part of the extraction liquid passes through micropores on the porous membrane 1 under pressure to flush out the diluent in the micropores of the porous membrane 1, so that the extraction efficiency of the porous membrane 1 in the extraction process is improved, and the other part of the extraction liquid is flushed out from the upper part of the porous hollow roller 3, so that the flow mode of the extraction liquid is changed from advection to turbulence, so that the diffusion speed of the diluent in the extraction liquid is improved; in conclusion, the porous membrane diluent extraction device provided by the embodiment has high extraction efficiency, simple structure and low production cost.
On the basis of the above embodiment, at least one set of auxiliary extraction modules is further disposed in the rinsing bath 2, and the auxiliary extraction modules are disposed in a direction close to the outlet of the porous membrane 1. As a preferred embodiment, only one set of auxiliary extraction modules is provided in this embodiment.
In this embodiment, after the porous membrane 1 containing the extraction liquid enters the water washing tank 2, the water washing liquid will wash the porous membrane 1, so that most of the extraction liquid on the porous membrane 1 is separated from the porous membrane 1; simultaneously, before porous membrane 1 transmits out wash bowl 2, the porous hollow roller 3 of supplementary extraction structure sprays the washing liquid through the through-hole under the drive power effect of drive structure, and one part washing liquid is followed the below of porous hollow roller 3 is washed out, because porous hollow roller 3 below is covered by porous membrane 1, so this part washing liquid passes under pressure the micropore on the porous membrane 1 washes out the washing liquid in the micropore of porous membrane 1 to improve the washing efficiency of porous membrane 1 in the washing process, and another part washing liquid is washed out by porous hollow roller 3 top, makes the mobile mode of washing liquid become the torrent from the advection, thereby has improved the diffusion velocity of extraction liquid in the washing liquid.
The driving structure is a hydraulic pump arranged outside the porous hollow roller 3, and the hydraulic pump is communicated with the inner cavity of the porous hollow roller 3 through a pipeline; the hydraulic pump provides driving force for the liquid in the porous hollow roller 3, so that the liquid in the porous hollow roller 3 can be ejected at a certain speed, thereby improving the extraction or cleaning effect.
Further, a plurality of through holes on the porous hollow roller 3 are distributed in an array manner along the length direction, so that the through holes are distributed in the circumferential direction of the porous hollow roller 3, and the porous membrane 1 which is driven around the porous hollow roller is completely washed in the width direction.
Wherein, as a preferred embodiment, the extraction liquid is dichloromethane; the water washing liquid is high purity water (DI-W).
Example 2
On the basis of example 1, this example further provides a porous membrane diluent extraction method, which is performed by:
s1, enabling the porous membrane 1 containing the diluent to enter an extraction tank 5 under the action of a driving force and to be driven around a guide roller 4 in the extraction tank 5, extracting the diluent on the porous membrane 1 immersed in the extraction liquid, and enabling a porous hollow roller 3 in the extraction tank 5 to spray the extraction liquid under the action of the driving force to flush the porous membrane 1 driven around the extraction liquid or form turbulent extraction liquid above the porous hollow roller 3, so that the porous membrane 1 containing the extraction liquid is obtained;
s2, the porous membrane 1 containing the extract enters the water washing tank 2 from the extraction tank 5 under the action of the transmission force and is transmitted around the guide roller 4 in the water washing tank 2, and the extract on the porous membrane 1 immersed in the water washing liquid is dissolved in the water washing liquid, so that the required porous membrane 1 is obtained.
In this embodiment, after the porous membrane 1 containing the diluent enters the extraction tank 5, the extraction liquid will extract the diluent, so that most of the diluent on the porous membrane 1 is separated from the porous membrane 1; meanwhile, before the porous membrane 1 is driven out of the extraction tank 5, the porous hollow roller 3 of the auxiliary extraction structure sprays extraction liquid through a through hole under the driving force of a driving structure, wherein a part of the extraction liquid is flushed out from the lower part of the porous hollow roller 3, because the lower part of the porous hollow roller 3 is covered by the porous membrane 1, the part of the extraction liquid passes through micropores on the porous membrane 1 under pressure to flush out the diluent in the micropores of the porous membrane 1, so that the extraction efficiency of the porous membrane 1 in the extraction process is improved, and the other part of the extraction liquid is flushed out from the upper part of the porous hollow roller 3, so that the flow mode of the extraction liquid is changed from advection to turbulence, and the diffusion speed of the diluent in the extraction liquid is improved; in conclusion, the porous membrane diluent extraction device provided by the embodiment has high extraction efficiency, simple structure and low production cost.
S2 further includes the following operations: before the porous membrane 1 is driven to flow out of the washing tank 2, the porous hollow roller 3 arranged in the washing tank 2 and close to the outlet direction of the porous membrane 1 sprays washing liquid under the action of driving force to wash the porous membrane 1 driven around the porous membrane or form turbulent washing liquid above the porous hollow roller 3.
In this embodiment, after the porous membrane 1 containing the extraction liquid enters the water washing tank 2, the water washing liquid will wash the porous membrane 1, so that most of the extraction liquid on the porous membrane 1 is separated from the porous membrane 1; simultaneously, before porous membrane 1 transmits out wash bowl 2, the porous hollow roller 3 of supplementary extraction structure sprays the washing liquid through the through-hole under the drive power effect of drive structure, and one part washing liquid is followed the below of porous hollow roller 3 is washed out, because porous hollow roller 3 below is covered by porous membrane 1, so this part washing liquid passes under pressure the micropore on the porous membrane 1 washes out the washing liquid in the porous membrane 1 micropore to improve the washing efficiency of porous membrane 1 in the washing process, and another part washing liquid is washed out by porous hollow roller 3 top, makes the mobile mode of washing liquid become the torrent from the advection, thereby improved the diffusion velocity of extraction liquid in the washing liquid.
Example 3
On the basis of example 2, this example further provides a porous film preparation method, which includes the following steps:
step one, uniformly mixing a polymer, a diluent and an additive, heating at a temperature higher than the melting point or the glass transition temperature of the polymer to form a melt, extruding the melt from a die head through twin-screw extrusion, and cooling at a certain temperature on a cooling roller to prepare a polymer sheet;
step two, stretching the polymer sheet to form a porous membrane 1 containing a diluent with uniform thickness, and extracting the porous membrane 1 containing the diluent with the diluent to obtain the required porous membrane 1;
in step two, the diluent-containing porous membrane 1 is subjected to a diluent extraction process using the porous membrane diluent extraction method described in example 2.
In this embodiment, the stretching portions in step one and step two belong to the prior art, and these portions are not referred to in the improvement point of this embodiment, so the description is omitted again.
Specifically, in this embodiment, the porous membrane 1 containing the diluent is subjected to the diluent extraction treatment by using the porous membrane diluent extraction method described in embodiment 2, so on one hand, after the porous membrane 1 containing the diluent enters the extraction tank 5, the extraction liquid will extract the diluent, so that most of the diluent on the porous membrane 1 is separated from the porous membrane 1; meanwhile, before the porous membrane 1 is driven out of the extraction tank 5, the porous hollow roller 3 of the auxiliary extraction structure sprays extraction liquid through a through hole under the driving force of a driving structure, wherein a part of the extraction liquid is flushed out from the lower part of the porous hollow roller 3, because the lower part of the porous hollow roller 3 is covered by the porous membrane 1, the part of the extraction liquid passes through micropores on the porous membrane 1 under pressure to flush out the diluent in the micropores of the porous membrane 1, so that the extraction efficiency of the porous membrane 1 in the extraction process is improved, and the other part of the extraction liquid is flushed out from the upper part of the porous hollow roller 3, so that the flow mode of the extraction liquid is changed from advection to turbulence, and the diffusion speed of the diluent in the extraction liquid is improved; on the other hand, after the porous membrane 1 containing the extraction liquid enters the water washing tank 2, the water washing liquid washes the porous membrane 1, so that most of the extraction liquid on the porous membrane 1 is separated from the porous membrane 1; simultaneously, before porous membrane 1 transmits out wash bowl 2, the porous hollow roller 3 of supplementary extraction structure sprays the washing liquid through the through-hole under the drive power effect of drive structure, and one part washing liquid is followed the below of porous hollow roller 3 is washed out, because porous hollow roller 3 below is covered by porous membrane 1, so this part washing liquid passes under pressure the micropore on the porous membrane 1 washes out the washing liquid in the porous membrane 1 micropore to improve the washing efficiency of porous membrane 1 in the washing process, and another part washing liquid is washed out by porous hollow roller 3 top, makes the mobile mode of washing liquid become the torrent from the advection, thereby improved the diffusion velocity of extraction liquid in the washing liquid.
In a preferred embodiment, the polymer is one or more selected from polyethylene and its copolymer, polypropylene and its copolymer, polyvinylidene fluoride, chitosan, polymethyl methacrylate, cellulose, polyvinyl nitrile, polyaniline, polyvinyl chloride, and polyvinyl alcohol.
Further, the diluent is preferably one or more selected from the group consisting of liquid paraffin, diphenyl ether, diisodecyl phthalate, methyl salicylate, diphenyl ether, diphenylmethane, camphene, soybean oil, glyceryl triacetate, acetic acid, dioctyl phthalate, tetramethylene sulfone, t-butanol, cyclohexanol, and diethylmalonic acid.
Further, it is preferable that the additive is one or more of a blowing agent, a nucleating agent, or an oxidizing agent.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The porous membrane diluent extraction device comprises an extraction tank (5), a rinsing tank (2), a plurality of guide rollers (4) which are arranged in the extraction tank (5) and the rinsing tank (2) and are vertically spaced, and a transmission structure for driving the porous membrane (1) to wind the guide rollers (4); wherein the extraction tank (5) is internally provided with an extraction liquid, and the rinsing tank (2) is internally provided with a rinsing liquid; the method is characterized in that: the device also comprises an auxiliary extraction structure, wherein the auxiliary extraction structure comprises at least one group of auxiliary extraction components, and each auxiliary extraction component comprises a porous hollow roller (3) arranged in the extraction tank (5) and a driving structure for driving liquid in the porous hollow roller (3) to be sprayed out from a through hole on the porous hollow roller; wherein at least one group of auxiliary extraction components is arranged in the extraction tank (5), and the auxiliary extraction components are arranged close to the tank outlet direction of the porous membrane (1);
the lower part of the porous hollow roller (3) is covered by the porous membrane (1), the porous hollow roller (3) sprays extraction liquid through the through holes under the driving force of the driving structure, wherein one part of the extraction liquid is flushed out from the lower part of the porous hollow roller (3) to flush out the diluent in the micropores of the porous membrane (1), and the other part of the extraction liquid is flushed out from the upper part of the porous hollow roller (3), so that the flow mode of the extraction liquid is changed from advection to turbulence.
2. The porous membrane diluent extraction device of claim 1, wherein: at least one group of auxiliary extraction assemblies is arranged in the rinsing bath (2), and the auxiliary extraction assemblies are arranged in the direction close to the outlet of the porous membrane (1).
3. The porous membrane diluent extraction device of claim 1, wherein: the driving structure is a hydraulic pump arranged outside the porous hollow roller (3), and the hydraulic pump is communicated with the inner cavity of the porous hollow roller (3) through a pipeline.
4. The porous membrane diluent extraction device of claim 1, wherein: the plurality of through holes on the porous hollow roller (3) are distributed in an array along the length direction.
5. A porous membrane diluent extraction method applied to the porous membrane diluent extraction device according to any one of claims 1 to 4, characterized in that: the operation method comprises the following steps:
s1, enabling the porous membrane (1) containing the diluent to enter an extraction tank (5) under the action of a driving force and to rotate around a guide roller (4) in the extraction tank (5), extracting the diluent on the porous membrane (1) immersed in the extraction liquid, and enabling a porous hollow roller (3) in the extraction tank (5) to spray the extraction liquid under the action of the driving force to wash the porous membrane (1) driven around the extraction liquid or form turbulent extraction liquid above the porous hollow roller (3), so that the porous membrane (1) containing the extraction liquid is obtained;
s2, enabling the porous membrane (1) containing the extract to enter the water washing tank (2) from the extraction tank (5) under the action of the transmission force and to transmit around the guide roller (4) in the water washing tank (2), and dissolving the extract on the porous membrane (1) immersed in the water washing liquid into the water washing liquid to obtain the required porous membrane (1).
6. The porous membrane diluent extraction method of claim 5, wherein: s2 further includes the following operations: before the porous membrane (1) is driven to flow out of the water washing tank (2), the porous hollow roller (3) arranged in the water washing tank (2) and close to the direction of the water outlet of the porous membrane (1) sprays water washing liquid under the action of driving force to wash the porous membrane (1) driven around the porous membrane or form turbulent water washing liquid above the porous hollow roller (3).
7. A porous membrane preparation method using the porous membrane diluent extraction method of any one of claims 5 to 6, comprising the steps of:
step one, uniformly mixing a polymer, a diluent and an additive, heating at a temperature higher than the melting point or the glass transition temperature of the polymer to form a melt, extruding the melt from a die head through twin-screw extrusion, and cooling at a certain temperature on a cooling roller to prepare a polymer sheet;
step two, stretching the polymer sheet to form a porous membrane (1) with uniform thickness and containing a diluent, and extracting the porous membrane (1) with the diluent to obtain the required porous membrane (1);
the method is characterized in that: in step two, the porous membrane (1) containing the diluent is subjected to a diluent extraction treatment using the porous membrane diluent extraction method according to claim 5 or 6.
8. The porous film production method according to claim 7, characterized in that: the polymer is one or more of polyethylene and its copolymer, polypropylene and its copolymer, polyvinylidene fluoride, chitosan, polymethyl methacrylate, cellulose, polyvinyl nitrile, polyaniline, polyvinyl chloride and polyvinyl alcohol.
9. The porous film production method according to claim 7, characterized in that: the diluent is one or more of liquid paraffin, diphenyl ether, diisodecyl phthalate, methyl salicylate, diphenylmethane, camphene, soybean oil, glyceryl triacetate, acetic acid, dioctyl phthalate, tetramethylene sulfone, tert-butyl alcohol, cyclohexanol and diethyl malonic acid.
10. The porous film production method according to claim 7, characterized in that: the additive is set as one or more of a foaming agent, a nucleating agent or an oxidizing agent.
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