CN202936343U - Preparation system for polyethylene microporous film - Google Patents
Preparation system for polyethylene microporous film Download PDFInfo
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- CN202936343U CN202936343U CN2012202983155U CN201220298315U CN202936343U CN 202936343 U CN202936343 U CN 202936343U CN 2012202983155 U CN2012202983155 U CN 2012202983155U CN 201220298315 U CN201220298315 U CN 201220298315U CN 202936343 U CN202936343 U CN 202936343U
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- preparation system
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- microporous membrane
- polyethene microporous
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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 utility model provides a preparation system for polyethylene microporous film. The preparation system comprises a stirring device, an extruding device, a cooling and shaping device, a biaxial stretching device, an extracting device, a transverse stretching device and a heat treatment device. The stirring device, the extruding device, the cooling and shaping device, the biaxial stretching device, the extracting device, the transverse stretching device and the heat treatment device are connected in sequence. With the preparation system provided by the utility model, a 6-micrometer ultrathin polyethylene microporous film can be made, the polyethylene microporous film has the advantages of high temperature resistance, corrosion resistance, good stability and long service life.
Description
Technical field
The utility model relates to a kind of preparation method and system, relates in particular to a kind of preparation method and system of polyethene microporous membrane.
Background technology
The chargeable lithium ion secondary cell has the characteristic of high-energy-density, long circulation life, memory-less effect, has again the advantages such as safe, reliable and energy fast charging and discharging, thereby becomes the focus of novel power supply technical study in recent years.Because lithium ion battery is the free of contamination secondary cell of environmental type, meet the large growth requirement in countries nowadays energy environment protection aspect, in the usage quantity of all trades and professions, increase sharply.Secondary lithium battery, except being widely used in the digital electronic goods such as the daily mobile phone of knowing, notebook computer and MP3, is also being brought into use aspect some high power batteries such as power truck, electric bicycle in recent years at present.From calendar year 2001, global lithium ion battery output is increasing progressively rapidly with annual 40% speed.
Barrier film is the important component part of lithium ion battery, and its performance has determined interface structure, internal resistance of battery etc., directly affects the characteristic such as capacity, cycle performance of battery.The barrier film of excellent performance has important effect to the over-all properties that improves battery.But preparation technology in the past can cause the inhomogeneous and membrane thickness unevenness of lithium ion battery separator pore-forming, thereby affect the quality of lithium ion battery.
The patent of invention that China Patent No. is 200810042043.0 has been announced a kind of preparation method and system of lithium ion battery separator.Preparation method's step of this lithium ion battery separator is as follows:
One, the ultra high molecular polyethylene that is 7,000,000 ~ 1,000,000 by molecular weight, polynorbornene linking agent, oxidation inhibitor and mineral oil proportioning by a certain percentage add the speed with 40～300rpm in stirrer that starting material are fully stirred, wherein, the mass ratio of mineral oil and oxidation inhibitor is 1500 ~ 1600: 1, the mass ratio of mineral oil and ultra high molecular polyethylene is 4 ~ 8: 1, and the mass ratio of linking agent and mineral oil is 1: 30 ~ 35;
Two, the mixture after being stirred by step 1 drops into twin screw extruder and extrudes continuously with 100～250 ℃ of heating, forms substrate;
Three, the cooling forming machine that the substrate that makes to extrude from twin screw extruder by the speed of 2～20 m/mins is 5～40 ℃ by temperature range carries out cooling forming;
Four, with the speed of 2～20 m/mins, substrate is carried out to horizontal stroke, vertical two-way simultaneous stretching by two-way stretch equipment, make substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 30～100 μ m, and barrier film acupuncture intensity is 300～600gf;
Five, use 98% ~ 99.5% high density alkanes extraction agent, the barrier film that is 1500～2500 millimeters by width extracts the mineral oil in barrier film by extraction tank;
Six, barrier film is carried out the thermal treatment of 1～3 minute at the temperature of 100～160 ℃;
Seven, curling lithium battery diaphragm is cut packing.
Aforesaid method has solved conventional art septation thickness low LCL evenly and the higher problem of cost, but also exists following defect:
The first, the ultra high molecular polyethylene high thermal resistance of using in step 1 in aforesaid method is poor, and easily crystallization, and the phenomenon that electrolytic solution oozes out easily appears in the battery that uses it to prepare, and work-ing life is shorter;
The second, after the mineral oil in aforesaid method extraction barrier film, extraction agent remaining on barrier film can not guarantee sufficient volatilization, causes diaphragm quality to descend; Barrier film exists shape the problem that deviation is large easily to occur simultaneously.
The utility model content
The purpose of this utility model is to provide a kind of preparation system of polyethene microporous membrane, this polyethene microporous membrane can be used as lithium ion battery separator, and to solve, the high temperature resistant and chemical resistance of lithium ion battery separator that prior art makes is poor causes the defect that the substandard products incidence is high and cost is higher.
In order to achieve the above object, the utility model provides a kind of preparation system of polyethene microporous membrane, comprises
Whipping appts;
Extrusion device, it is connected with whipping appts;
Cooling forming device, it is connected with extrusion device;
Two-way stretch device, it is connected with cooling forming device;
Extraction plant, it is connected with two-way stretch device;
Transversal stretching device, it is connected with extraction plant;
Thermal treatment unit, it is connected with transversal stretching device.
Preferably, described transversal stretching device comprises the gripping unit in order to clamp the film after extraction, the track that gripping unit is moved forward and the strut member that gripping unit and track are supported, and gripping unit comprises left clamping unit and the right clamping unit that is positioned at the film both sides.
Preferably, track length is 20 ~ 30 meters, and track becomes an oblique angle that is less than 5 ° outwards to depart from the film movement direction.
Preferably, after the thermal treatment unit that film is heat-treated, also be provided with to finished films carry out curling, cut and pack cut packing plant.
Preferably, described cooling forming device comprises six groups of cooling rollers that temperature is different.
Preferably, described extraction plant is an extraction tank.
Preferably, described extrusion device is a twin screw extruder.
With respect to prior art, the utlity model has following advantage:
1, the utility model adopts enhancing and the corrosion resistant filler of polypropylene as polyethene microporous membrane, polypropylene has resistance to elevated temperatures good (can reach 180～190 degree), shrinking percentage is low, the advantage of acid-and base-resisting, salt and oxygenant corrosion, the battery that its battery diaphragm of polyethylene as filler makes of usining is not easy to explode, and anti-immersion, soak time length also can not affect the life-span of battery.
2, the preparation system of polyethene microporous membrane of the present utility model has added the film transversal stretching device, film has been carried out to the work of stretching, correction and typing, makes remaining extraction agent be volatilized fully simultaneously, and has reduced the appearance of fraction defective.
3, can select the extraction agent that concentration is low to be extracted, reach same effect.
4, stretched with the speed of 8 ~ 50 m/mins, can be increased work efficiency, reduced costs.
5, after using transversal stretching device, heat treated temperature also will reduce, and thermal treatment temp is reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces costs.
6,, after using transversal stretching device, by oriented film again, can produce the wider film of fabric width.
Polyethene microporous membrane of the present utility model, except can be used for lithium ion battery separator, also can be used as membrane for water treatment etc.
The accompanying drawing explanation
The preparation system structure iron of a kind of polyethene microporous membrane that Fig. 1 is the utility model embodiment;
Fig. 2 is the transversal stretching device structure iron.
Embodiment
Embodiment
In the present embodiment, a kind of preparation method's of polyethene microporous membrane step is as follows:
One, by polyethylene, polypropylene, linking agent, oxidation inhibitor and mineral oil by a certain percentage proportioning add in stirrer starting material fully stirred, wherein, the mass ratio of mineral oil and oxidation inhibitor is 500 ~ 1800: 1, the mass ratio of linking agent and mineral oil is 1: 30 ~ 35, mineral oil and polyacrylic mass ratio are 1000:20 ~ 900, and mineral oil and poly mass ratio are 2 ~ 10: 1.
Oxidation inhibitor in the present embodiment can adopt phenolic antioxidant Irganox and 2,6 di tert butyl 4 methyl phenol, and linking agent is polynorbornene.
Two, the mixture after being stirred by step 1 drops into twin screw extruder and extrudes continuously with 80～300 ℃ of heating, forms substrate.
Here the screw diameter of twin screw extruder is 10 ~ 200 millimeters, and its extrusion capacity per hour is greater than 200 kilograms.
Three, the substrate of extruding from twin screw extruder carries out cooling forming through one group of cooling roller group;
Four, with the speed of 5～50 m/mins, substrate is carried out to horizontal stroke, vertical two-way simultaneous stretching by two-way stretch equipment, make substrate be drawn into film, the film thickness of drawing and forming reaches 10～150 μ m.
Five, the film that is 1000～3000 millimeters by width extracts the mineral oil in film by extraction tank, and one-step pore-creating.
Six, the film after extracting, by transverse stretching equipment, is finalized the design, is stretched, is rectified a deviation film with the speed of 8 ~ 50 m/mins, and guaranteed the volatilization of the remaining extraction liquid on film.
Seven, film is carried out the thermal treatment of 1～10 minute at the temperature of 60～150 ℃.
In addition, after the thermal treatment of film completing steps seven, also need finished films is carried out to work curling, that cut and pack.
Method of the present utility model can be passed through the preparation system of following a kind of polyethene microporous membrane and realize, as shown in Figure 1, and the preparation system structure iron of its a kind of polyethene microporous membrane that is the utility model embodiment.The preparation system of this polyethene microporous membrane comprises whipping appts 103, extrusion device 105, cooling forming device 107, two-way stretch device 109, extraction plant 111, transversal stretching device 113, thermal treatment unit 115.And whipping appts 103, extrusion device 105, cooling forming device 107, two-way stretch device 109, extraction plant 111, transversal stretching device 113, thermal treatment unit 115 connect successively.
When the preparation system work of polyethene microporous membrane of the present utility model, at first a certain proportion of polyethylene, polypropylene, linking agent, oxidation inhibitor and mineral oil are added in whipping appts 103 and fully stirred.Wherein, the mass ratio of mineral oil and oxidation inhibitor is 500 ~ 1800: 1, and the mass ratio of linking agent and mineral oil is 1: 30 ~ 35, and mineral oil and polyacrylic mass ratio are 1000:20 ~ 900, and mineral oil and poly mass ratio are 2 ~ 10: 1.Polyacrylic molecular weight is more than 500,000, and poly molecular weight is more than 500,000.The utilized viscosity grade of mineral oil is between 30～60.
After the abundant stirring of whipping appts 103, its mixture is added to extrusion device 105 at polyethylene, polypropylene, linking agent, oxidation inhibitor and mineral oil, and extrude continuously with 80～300 ℃ of heating, form substrate, the thickness of this substrate is 0.1～15mm.Wherein extrusion device 105 can be twin screw extruder, and its screw diameter is 10 ~ 150 millimeters, and extrusion capacity per hour is greater than 200 kilograms, and the temperature of head generally can be 80～300 ℃.
After extrusion device 105 is extruded substrate, the substrate of extruding is passed through to cooling forming device 107 with the speed of 5～50 m/mins, and with the temperature range of 5～80 ℃, substrate is carried out to cooling forming.Cooling forming device 107 can be comprised of six groups of cooling rollers, the temperature difference of every group of cooling roller, and cooling forming can make in substrate polypropylene and polyethylene non-crystallizable, reaches the purpose of film thickness homogeneous.
Substrate after cooling forming device 107 cooling formings, then by two-way stretch device 109 with the speed of 5～50 m/mins carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into the film that thickness is 10～150 μ m.Two-way stretch device 109 stretches for transverse and longitudinal simultaneously, can regulate tensile strength by regulating stretch ratio, can guarantee that like this film thickness is even, and the transverse and longitudinal stretch ratio can be adjusted according to the thickness degree.
Film, after two-way stretch device 109 drawing and formings, then carries out single extraction through extraction plant 111, and extracts the mineral oil in film.Extraction plant 111 can be extraction tank.Extraction agent in extraction plant 111 can be n-decane, normal heptane, methylene dichloride etc., and wherein the extraction agent of alkanes can make the mineral oil in film separate out fully.
Film, after extraction plant 111 extractions, enters transversal stretching device 113.Transverse stretching equipment comprises the gripping unit 1131 in order to clamp the film after extraction, the track 1132 that gripping unit is moved forward and the strut member 1133 that gripping unit and track are supported.After film enters transversal stretching device 113, left clamping unit and right clamping unit clamp the both sides of film.After clamping, film is along with gripping unit 1131 speed with 5 ~ 50 m/mins under track 1132 effects travels forward.Due to track 1132, with the film movement direction, become an oblique angle that is less than 5 ° outwards to depart from, along with travelling forward of film, distance between left clamping unit and right clamping unit increases gradually, and film is launched by cross directional stretch gradually, and this process has completed correction and the typing of film.Simultaneously, the length setting of track is 20 ~ 30 meters, remains in extraction agent on film and can access volatilization more fully in the process of whole motion, and the thickness homogeneity by the cross directional stretch film is controlled better.
Finally by thermal treatment unit 115 by its at the temperature of 60～150 ℃ to carrying out thermal treatment in 1～10 minute.
As long as by cut packing plant to the film after processing carry out curling, cut and the operation such as packing after just can obtain the finished product of polyethene microporous membrane.
With respect to prior art, the utlity model has following advantage:
1, the utility model adopts enhancing and the corrosion resistant filler of polypropylene as polyethene microporous membrane, polypropylene has resistance to elevated temperatures good (can reach 180～190 degree), shrinking percentage is low, the advantage of acidproof alkali salt and oxygenant corrosion, the battery that its battery diaphragm of polyethylene as filler makes of usining is not easy to explode, and anti-immersion, soak time length also can not affect the life-span of battery.
2, the preparation system of polyethene microporous membrane of the present utility model has added the film transversal stretching device, film has been carried out to the work of stretching, correction and typing, makes remaining extraction agent be volatilized fully simultaneously, and has reduced the appearance of fraction defective.
3, can select the extraction agent that concentration is low to be extracted, reach same effect.
4, stretched with the speed of 8 ~ 50 m/mins, can be increased work efficiency, reduced costs.
5, after using transversal stretching device, heat treated temperature also will reduce, and thermal treatment temp is reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces costs.
6,, after using transversal stretching device, by oriented film again, can produce the wider film of fabric width.
The polyethene microporous membrane that the utility model prepares not only can be used as battery diaphragm, also can be used for membrane for water treatment etc.
Above disclosed be only several specific embodiment of the present utility model, but the utility model is not limited thereto, the changes that any person skilled in the art can think of, all should drop in protection domain of the present utility model.
Claims (7)
1. the preparation system of a polyethene microporous membrane, is characterized in that, comprises
Whipping appts;
Extrusion device, it is connected with whipping appts;
Cooling forming device, it is connected with extrusion device;
Two-way stretch device, it is connected with cooling forming device;
Extraction plant, it is connected with two-way stretch device;
Transversal stretching device, it is connected with extraction plant;
Thermal treatment unit, it is connected with transversal stretching device.
2. the preparation system of polyethene microporous membrane as claimed in claim 1, it is characterized in that, described transversal stretching device comprises the gripping unit in order to clamp the film after extraction, the track that gripping unit is moved forward and the strut member that gripping unit and track are supported, and gripping unit comprises left clamping unit and the right clamping unit that is positioned at the film both sides.
3. the preparation system of polyethene microporous membrane as claimed in claim 2, is characterized in that, track length is 20 ~ 30 meters, and track becomes an oblique angle that is less than 5 ° outwards to depart from the film movement direction.
4. the preparation system of polyethene microporous membrane as claimed in claim 1, is characterized in that, after the thermal treatment unit that film is heat-treated, also be provided with to finished films carry out curling, cut and pack cut packing plant.
5. the preparation system of polyethene microporous membrane as claimed in claim 1, is characterized in that, described cooling forming device comprises six groups of cooling rollers that temperature is different.
6. the preparation system of polyethene microporous membrane as claimed in claim 1, is characterized in that, described extraction plant is an extraction tank.
7. the preparation system of polyethene microporous membrane as claimed in claim 1, is characterized in that, described extrusion device is a twin screw extruder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202983155U CN202936343U (en) | 2012-06-25 | 2012-06-25 | Preparation system for polyethylene microporous film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202983155U CN202936343U (en) | 2012-06-25 | 2012-06-25 | Preparation system for polyethylene microporous film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202936343U true CN202936343U (en) | 2013-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202983155U Expired - Fee Related CN202936343U (en) | 2012-06-25 | 2012-06-25 | Preparation system for polyethylene microporous film |
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|---|---|
| CN (1) | CN202936343U (en) |
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2012
- 2012-06-25 CN CN2012202983155U patent/CN202936343U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20160625 |