CN107863477A - A kind of PVDF BP micropore polymer diaphragms and preparation method - Google Patents
A kind of PVDF BP micropore polymer diaphragms and preparation method Download PDFInfo
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- CN107863477A CN107863477A CN201710966921.7A CN201710966921A CN107863477A CN 107863477 A CN107863477 A CN 107863477A CN 201710966921 A CN201710966921 A CN 201710966921A CN 107863477 A CN107863477 A CN 107863477A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of PVDF BP micropore polymer diaphragms and preparation method, PVDF BP micropore polymer diaphragms, by weight, the PVDF BP micropore polymer diaphragms include 35 50 parts of PVDF Kynoar, 50 65 parts of BP benzophenone, 05 parts of auxiliary agent.The method for preparing PVDF BP micropore polymer diaphragms, is comprised the following steps that：Step 1：Stirring；Step 2：Dissolving extrusion；Step 3：It is cooled and shaped；Step 4：Stretching；Step 5：Extraction；Step 6：Sizing；Step 7：Batch；Step 8：Storage.A kind of PVDF BP micropore polymer diaphragms of the present invention have that puncture strength is high, heat-resisting quantity is good, even aperture distribution, good permeability, resistance to electrochemistry is excellent, inhales the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, and production efficiency is high.
Description
Technical field
The present invention relates to a kind of PVDF-BP micropore polymer diaphragms and preparation method.
Background technology
Critical component of the barrier film as battery, the capacity, cycle performance and security performance of battery will be directly affected.In recent years
Come, porous polymeric objects system causes the extensive concern of people, Bellcore companies of U.S. Kynoar-hexafluoro in 1994
The polymer film of microcellular structure is made by plasticising/extraction process for propylene (PVDF-HFP), adds the suction of polymer dielectric
Liquid rate, but PVDF-HFP based polyalcohol barrier films are present that transference number of ions is low, heat endurance is bad, poor air permeability, resistance to electrochemistry
The shortcomings of difference and interface compatibility are bad.
The content of the invention
The purpose of the present invention is overcome the shortcomings of in existing product, there is provided a kind of PVDF-BP micropore polymer diaphragms and system
Preparation Method.
In order to achieve the above object, the present invention is achieved by the following technical solutions：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
Kynoar 35-50 parts, BP benzophenone 50-65 parts, auxiliary agent 0-5 parts.
Preferably, the auxiliary agent is the one or more in toughener, antioxidant, heat stabilizer, antistatic additive.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, PVDF Kynoar 35-50 parts, BP benzophenone 50-65 parts, auxiliary agent are weighed
0-5 parts are mixed to obtain mixture；
Step 2：Dissolving extrusion：Inject the mixture into double screw extruder, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
It is stretched into film；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room.
Preferably, the temperature of the storage room is less than 35 DEG C, humidity is less than 70%.
Preferably, described be stretched as horizontal and vertical stretching.
Preferably, the draft temperature is 100-140 DEG C.
Preferably, described be injected into mixture in double screw extruder by Melt Pump.
Invention has the beneficial effect that：A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength high, resistance to
High temperatures good, even aperture distribution, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention
Simply, green, production efficiency is high.
Embodiment
Technical scheme is described further below：
Explanation：Auxiliary agent is the one or more in toughener, antioxidant, heat stabilizer, antistatic additive, refers to auxiliary agent
For in toughener or antioxidant or heat stabilizer or antistatic additive or toughener, antioxidant, heat stabilizer, antistatic additive at least two
The mixture of kind.
Embodiment 1：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
35 parts of Kynoar, 50 parts of BP benzophenone.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 35 parts of PVDF Kynoar is weighed, 50 parts of BP benzophenone is mixed
Obtain mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
Embodiment 2：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
35 parts of Kynoar, 50 parts of BP benzophenone, 1 part of auxiliary agent, auxiliary agent are in toughener, antioxidant, heat stabilizer, antistatic additive
One or more.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 35 parts of PVDF Kynoar, 50 parts of BP benzophenone, 1 part of progress of auxiliary agent are weighed
Mixing obtains mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
Embodiment 3：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
50 parts of Kynoar, 65 parts of BP benzophenone, 5 parts of auxiliary agent, auxiliary agent are in toughener, antioxidant, heat stabilizer, antistatic additive
One or more.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 5 parts of 50 parts of PVDF Kynoar, 65 parts of BP benzophenone, auxiliary agent progress are weighed
Mixing obtains mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
Embodiment 4：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
40 parts of Kynoar, 55 parts of BP benzophenone, 3 parts of auxiliary agent, auxiliary agent are in toughener, antioxidant, heat stabilizer, antistatic additive
One or more.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 3 parts of 40 parts of PVDF Kynoar, 55 parts of BP benzophenone, auxiliary agent progress are weighed
Mixing obtains mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
Embodiment 5：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
50 parts of Kynoar, 65 parts of BP benzophenone.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 50 parts of PVDF Kynoar is weighed, 65 parts of BP benzophenone is mixed
Obtain mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
Embodiment 6：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
32 parts of Kynoar, 52 parts of BP benzophenone, 2 parts of auxiliary agent, auxiliary agent are in toughener, antioxidant, heat stabilizer, antistatic additive
One or more.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 2 parts of 32 parts of PVDF Kynoar, 52 parts of BP benzophenone, auxiliary agent progress are weighed
Mixing obtains mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
Embodiment 7：
A kind of PVDF-BP micropore polymer diaphragms, by weight, the PVDF-BP micropore polymer diaphragms include PVDF
48 parts of Kynoar, 60 parts of BP benzophenone, 4 parts of auxiliary agent, auxiliary agent are in toughener, antioxidant, heat stabilizer, antistatic additive
One or more.
A kind of method for preparing PVDF-BP micropore polymer diaphragms, is comprised the following steps that：
Step 1：Stirring：By weight, 4 parts of 48 parts of PVDF Kynoar, 60 parts of BP benzophenone, auxiliary agent progress are weighed
Mixing obtains mixture；
Step 2：Dissolving extrusion：Mixture is injected into double screw extruder by Melt Pump, substrate is extruded after dissolving；
Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；
Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by drawing several times
Film is stretched into, is stretched as horizontal and vertical stretching, draft temperature is 100-140 DEG C；
Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；
Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；
Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；
Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel
PVDF-BP micropore polymer diaphragms are not cut, and the reel PVDF-BP micropore polymer diaphragm plastics do not cut are thin
Film outsourcing, it is then hanging or stand in storage room；By cutting if reel PVDF-BP micropore polymer diaphragms are cut
Reel PVDF-BP micropore polymer diaphragms are positioned over storage room, and the temperature of storage room is less than 35 DEG C, and humidity is less than 70%.
One kind of the present invention, which prepares PVDF-BP micropore polymer diaphragms, has advantages below：
Puncture strength is high：With higher mechanical strength, >=450gf；
Heat-resisting quantity is good：More preferable heat resistance and closed pore performance, heat resisting temperature reach 170 DEG C；
Even aperture distribution：The thickness of barrier film, the ventilative, homogeneity of pore-size distribution；
Good permeability：Under the requirement for ensureing battery safety, there is bigger permeability, air permeability<25S/
mil；
Resistance to electrochemistry is excellent：The advantages of with fluoro-containing plastic, possess more preferable resistance to electrochemistry oxidation performance；
It is good to inhale electrolysis fluidity：PVDF wellabilities are good, have and preferably inhale electrolyte property and higher porosity.
A kind of PVDF-BP micropore polymer diaphragms of the present invention have puncture strength height, heat-resisting quantity is good, pore-size distribution is equal
Even, good permeability, resistance to electrochemistry are excellent, inhale the advantages of electrolysis fluidity is good；Preparation method of the present invention is simple, green, production
Efficiency high.
It should be noted that listed above is only a kind of specific embodiment of the invention.It is clear that the invention is not restricted to
Upper embodiment, there can also be many deformations, in a word, one of ordinary skill in the art can directly lead from present disclosure
All deformations for going out or associating, are considered as protection scope of the present invention.
Claims (7)
- A kind of 1. PVDF-BP micropore polymer diaphragms, it is characterised in that by weight, the PVDF-BP micropore polymer diaphragms Including PVDF Kynoar 35-50 parts, BP benzophenone 50-65 parts, auxiliary agent 0-5 parts.
- A kind of 2. PVDF-BP micropore polymer diaphragms according to claim 1, it is characterised in that the auxiliary agent be toughener, One or more in antioxidant, heat stabilizer, antistatic additive.
- A kind of 3. method for preparing PVDF-BP micropore polymer diaphragms described in claim 1, it is characterised in that specific steps are such as Under：Step 1：Stirring：By weight, PVDF Kynoar 35-50 parts, BP benzophenone 50-65 parts, auxiliary agent 0-5 parts are weighed Mixed to obtain mixture；Step 2：Dissolving extrusion：Inject the mixture into double screw extruder, substrate is extruded after dissolving；Step 3：It is cooled and shaped：The substrate of extrusion is cooled and shaped in temperature for 10~100 DEG C of conditions；Step 4：Stretching：Stretching-machine will be entered after substrate drying after cooling, substrate is in stretching-machine by being drawn into several times Film；Step 5：Extraction:By film by extraction tank, auxiliary agent remaining in film is fully extracted；Step 6：Sizing：Film is entered into Equipment for Heating Processing, heat treatment is carried out to film；Step 7：Batch:Film is wound to obtain reel PVDF-BP micropore polymer diaphragms；Step 8：Storage：Reel PVDF-BP micropore polymer diaphragms are cut or not cut, if by reel PVDF-BP Micropore polymer diaphragm is not cut, the reel PVDF-BP micropore polymer diaphragm plastic sheeting outsourcings that will do not cut, Then it is hanging or stand in storage room；By the reel of cutting if reel PVDF-BP micropore polymer diaphragms are cut PVDF-BP micropore polymer diaphragms are positioned over storage room.
- A kind of 4. preparation method of PVDF-BP micropore polymer diaphragms according to claim 3, it is characterised in that the storage The temperature for depositing room is less than 35 DEG C, and humidity is less than 70%.
- A kind of 5. preparation method of PVDF-BP micropore polymer diaphragms according to claim 3, it is characterised in that the drawing Stretch for horizontal and vertical stretching.
- A kind of 6. preparation method of PVDF-BP micropore polymer diaphragms according to claim 3, it is characterised in that the drawing Temperature is stretched for 100-140 DEG C.
- 7. a kind of preparation method of PVDF-BP micropore polymer diaphragms according to claim 3, it is characterised in that described to incite somebody to action Mixture is injected into double screw extruder by Melt Pump.
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Application publication date: 20180330 |