CN100586540C - Method for preparing polyolefin micro-porous film - Google Patents
Method for preparing polyolefin micro-porous film Download PDFInfo
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- CN100586540C CN100586540C CN200510127685A CN200510127685A CN100586540C CN 100586540 C CN100586540 C CN 100586540C CN 200510127685 A CN200510127685 A CN 200510127685A CN 200510127685 A CN200510127685 A CN 200510127685A CN 100586540 C CN100586540 C CN 100586540C
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 239000002904 solvent Substances 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 7
- 238000000194 supercritical-fluid extraction Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims description 67
- 239000012528 membrane Substances 0.000 claims description 44
- 239000011265 semifinished product Substances 0.000 claims description 29
- 239000000284 extract Substances 0.000 claims description 22
- 238000005516 engineering process Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 11
- 238000002145 thermally induced phase separation Methods 0.000 claims description 11
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- 238000001035 drying Methods 0.000 claims description 6
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- 238000012856 packing Methods 0.000 claims description 2
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
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- 238000005406 washing Methods 0.000 description 2
- FYIRUPZTYPILDH-UHFFFAOYSA-N 1,1,1,2,3,3-hexafluoropropane Chemical compound FC(F)C(F)C(F)(F)F FYIRUPZTYPILDH-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
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- 241001269238 Data Species 0.000 description 1
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Cell Separators (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention relates to a preparation method of polyolefine microporous membrane. Said invention adopts thermal phase separation process to prepare said polyolefine microporous membrane, saidprocess includes the following steps: mixing polyolefine compound and first solvent, melting them by using extruder, extruding melt, cooling and forming to obtain a colloidal material, making said colloidal material undergo the processes of supercritical extraction, thermal stretching and setting so as to obtain the invented product.
Description
Technical field
The present invention relates to method for preparing polyolefin micro-porous, particularly remove the supercritical extraction method of the first solvent pore-forming in the polyolefin micro porous polyolefin membrane thermally induced phase separation manufacture process.
Technical background
Polyolefin micro porous polyolefin membrane has the three micronetwork micropores that run through, owing to be difficult under the polyolefin substrate normal temperature being dissolved in organic solvent and conventional acid, alkali, micro-porous film can be used for battery diaphragm, electrolytic capacitor barrier film, little/secondary filter purposes such as milipore filter; Polyolefin micro porous polyolefin membrane is stable to the organic bath and the electrode active material of lithium rechargeable battery, also can be widely used in lithium ion secondary battery membrane.
The method that present commercial batch is made polyolefin micro porous polyolefin membrane mainly is divided into dry method and wet method, " dry method " typical process is three layers of PP/PE/PP composite diaphragm of the commodity Celgard 2300 by name of U.S. Celanese company, utilize the semi-crystalline character of PP, PE, after extrusion molding is shaped, the annealing crystallization processing goes out micro-crack in crystalline region and amorphous area simple tension.The perforated membrane porosity of this manufactured is difficult to surpass 40%; Process conditions harshness in addition, the percent defective height, production cost is higher; Because molecular weight is difficult to stable extruding when too high, the polyolefinic weight average molecular weight of " dry method " process using for improving the tensile strength of film, can only be leaned on the high magnification stretch orientation generally below 200,000, the tearing toughness of this composite membrane is relatively poor, easily causes the inside battery micro-short circuit in the production.Process solvent in " wet method " that need not be following in this method raw material, advantage are to clean, and production cost is low.
" wet method " technology is known to be had, and as CN1331496A inorganic powders such as nano-calcium carbonate micro mist is blended in the high molecular polyolefine, after the melting mixing moulding, adopts pickling to extract inorganic powder, and obtains the method for micro-porous film.This method needs the pickling extraction process of inorganic matter, and the microporous barrier that obtains is difficult to control the pore-forming uniformity owing to the reunion of inorganic powder in the mixing process becomes big.
Another " wet method " technology of making micro-porous film is called thermally induced phase separation, and " wet method " technique manufacturing method that uses extrahigh-molecular weight polyolefins to do the high strength micro-porous film of base material has had a lot of motions.For example, CN 2004100573936, CN2004100811281, CN1134491C, Japanese patent laid-open 8-34873,5-74442,5-335005, put down in writing the manufacture method of individual layer extrahigh-molecular weight polyolefins micro-porous film in the documents such as 6-325747, the polyolefin composition heating for dissolving that is about to contain extrahigh-molecular weight polyolefins is at insoluble and first solvent that mixing is good under the high temperature (paraffin oil of room temperature, solid paraffin, process solvents such as neck dioctyl phthalate) in, should be hot gluey plate of homogeneous solution cooling forming gelation or film, the above-mentioned jelly that freezes is heated the after-drawing attenuate, strengthen, extract first solvent, oven dry and obtain the method for micro-porous film, wherein extraction and hot-stretch operation can be adjusted mutually.Solidification forming or solid, liquid phase-splitting thermokinetics condition by the control homogeneous solution, can obtain the nanometer micropore polyolefin micro porous polyolefin membrane, feature is that pore-size distribution is narrow, even and the aperture is little, since adopt weight average molecular weight 500,000 or more high molecular polyolefine and be orientated through hot-stretch, can obtain the polyolefin micro porous polyolefin membrane of higher-strength and tear-proof, anti-acupuncture performance; Especially can be used for lithium ion secondary battery membrane preferably.But traditional thermally induced phase separation is made polyolefin micro porous polyolefin membrane, must extract first solvent, after tradition adopts volatile second solvent extractions (or being called extracting, cleaning, washing) such as low boiling chloralkane, ether such as alkane, carrene, fluoroform, carbon tetrachloride, tetrachloro-ethylene such as hexane, pentane, heptane to fall first solvent, carry out drying again and handle, obtain microporous membrane; The main method of washing comprises film conventional clean methods such as immersion, spray in second solvent, sees that CN1128835C, CN018115667 document are described.This cleaning method is owing to lower mass transfer rate between the extractant and first solvent, extraction efficiency is lower, the film semi-finished product can only carry out the classification cleaning with monofilm through the above rinse bath of two-stage after the uncoiling, cleaning speed generally 3-10 rice/minute, add operations such as oven dry, traditional polyolefin micro porous polyolefin membrane cleaning product line length often designs longlyer, because above-mentioned second solvent is poisonous usually, inflammable and explosive etc., the security of equipment and the recovery of solvent etc. have been proposed special harsh requirement, the cleaning equipment investment is bigger, production line efficiency is low, and is uneconomical.
The object of the present invention is to provide new polyolefin micro porous polyolefin membrane manufacture method, promptly adopt supercritical extraction method thermally induced phase separation technology to be made first solvent in the polyolefin micropore membrane process extracts, the method for extracting pore-forming with high extraction efficiency and economy.
Supercritical fluid has the high diffusibility of gas and high mass transfer rate and liquid have bigger solubility to solute characteristics concurrently, the more important thing is near critical point, the minor variations of pressure and temperature can cause the variation that fluid density is very big, and correspondingly show as solubility change, be called for short solvation effect, therefore, people can utilize the variation of pressure and temperature to realize extraction and separating process.The supercritical extract process is to utilize to be in critical pressure (abbreviation Pc, units MPa) and critical-temperature (be called for short Tc, unit ℃) above fluid has the solvability of special increase and the chemical separating new technology that grows up, be widely used at present extraction, the separation of Chinese medicine organic principle, the supercritical CO that coffee bean removes caffeine has been built up in Germany in 1978
2Extraction commercial plant (treating capacity reaches 27Kt/a), it is extractant that nontoxic carbon dioxide is adopted in separation process.
Japan Patent 2003-003323 proposes to adopt supercritical CO
2The extraction superhigh molecular weight polyethylene fibers is because supercritical CO
2The solubility of used first solvent (paraffin wet goods) is limited during to the preparation superhigh molecular weight polyethylene fibers, and extraction efficiency is still not enough.
Chinese patent 2005100732496 proposes to adopt methane, ethane, propane, ethene, propylene to make extractant superhigh molecular weight polyethylene fibers is carried out supercritical extract; The extractant that this method adopts is inflammable, explosive medium, and equipment and technological operation are had relatively high expectations.
Have not yet to see and adopt supercritical extraction method to remove the report of the first solvent pore-forming aspect in the polyolefin micro porous polyolefin membrane thermally induced phase separation manufacture process.
Summary of the invention
The objective of the invention is for overcoming the deficiencies in the prior art part, propose to remove in a kind of novel polyolefin micro porous polyolefin membrane thermally induced phase separation manufacture process the supercritical extraction method of first solvent.
Polyolefin micro porous polyolefin membrane of the present invention comprises that mainly the ultra-high molecular weight polyethylene (UHMWPE) of weight average molecular weight more than 500,000 cooked the micro-porous film of base material manufacturing and polypropylene or ethylene-propylene copolymer etc. are done the polyolefin micro porous polyolefin membrane that base material is made, turn-off temperature to be suitable for the safety requirements of lithium ion secondary battery membrane for the heat of regulating polyolefin micro porous polyolefin membrane, can in above-mentioned base material, add low-melting metallocene linear-low density polyethylene (m-LLDPE) or Tissuemat E (PEwax), low-molecular-weight polyisobutylene (PIB) etc. and constitute polyolefin composition.
The thermally induced phase separation manufacture method of polyolefin micro porous polyolefin membrane of the present invention mainly comprises: will contain the first good solvent (paraffin oil of mixing under polyolefin composition and the high temperature, solid paraffin, kerosene, the neck dioctyl phthalate, neck phthalic acid dinonyl, process solvents such as neck phthalic acid two isodecyl esters) even through the double screw extruder melting mixing, hot even melt is extruded, gluey plate of cooling forming gelation or film, the above-mentioned jelly that freezes is carried out or is not carried out the hot-stretch attenuate before or after extraction, strengthen, thermal finalization is handled, adopt supercritical extract to go out first solvent to the polyolefin micro porous polyolefin membrane semi-finished product, oven dry and obtain micro-porous film, wherein adjustment is in proper order mutually for extraction and hot-stretch operation, for not requiring high-intensity polyolefin micro porous polyolefin membrane application scenario, can stretch to microporous barrier and strengthen.
Be in high pressure, be first solvent that nanoscale/submicron-scale disperse is distributed in polyolefin three micronetworks in supercritical fluid under the high temperature and the semi-finished product and higher thermalizing collision arranged in the molecule aspect, the counterdiffusion probability, therefore the dissolving of first solvent, the more conventional cleaning method of mass transfer velocity is accelerated greatly, the semi-finished product film can be launched just can fully clean removal first solvent, in the extraction kettle of 300L, can finish the core work of supercritical extract first solvent, adopt method of the present invention to make the advantage that polyolefin micro porous polyolefin membrane had both been given full play to traditional thermally induced phase separation: can obtain polyolefin micro porous polyolefin membrane nanometer level microporous or the sub-micron micropore, pore-size distribution is narrow, evenly, can obtain higher-strength and tear-proof, the polyolefin micro porous polyolefin membrane of anti-acupuncture performance; Reduced the indispensable expensive production cost that matting caused of traditional thermally induced phase separation again, therefore competitiveness on the cost performance can be arranged with the polyolefin micro porous polyolefin membrane of " dry method " explained hereafter, can popularize technical fields such as being used for lithium ion secondary battery membrane.
The selection of Extractant that supercritical extraction method is removed first solvent in the polyolefin micro porous polyolefin membrane semi-finished product is very crucial, and the selection of Extractant principle mainly comprises: 1, extractant has good compatibility and solubility to above-mentioned first solvent; 2, the critical-temperature of extractant should be less than (Tm-10) ℃, and Tm is the melt temperature or the fusing point of polyolefin substrate; 3, the critical pressure of extractant is below 7MPa; 4, the normal boiling point of extractant should be lower than 25 ℃, and is volatile; 5, extractant is less to the load of environment, can not be the hydrogeneous bromine fluorohydrocarbon (HBFCs) of the high ODP value of second class (consuming the ozone latent energy value) listed among controlled substance listed among Montreal Protocol on Substances that Deplete the Ozone Layer London amendment annex A and accessories B, the annex E or the annex C and other ODP values greater than 0.20 material.
The extractant that can satisfy above-mentioned composite request includes but not limited to following listed material: the ethane R170 of alkanes, propane R290, butane R600, iso-butane R600a; The ethene R1150 of olefines, propylene R1270; R22, R124, the R142b of the serial cold-producing medium of hydrochlorofluorocarsolvent (HCFCs); R23, R41, R32, R125, R143a, R161, R134a, R152a, R245cb, R227ea, R236fa, R254cb, R236ea, R245fa, R329mcc, R347mcc, R338mcf, the R338mee of the serial cold-producing medium of hydrogen fluorohydrocarbon (HFCs); R14, R116, R218, R1216, the C318 of the serial cold-producing medium of perfluoro alkane (FCs); R507A, R508A, R508B, the R509A of azeotropic mixture class series cold-producing medium; R410A, R410B, R402A, R402B, R407A, R407B, R404A, R408A, R403A, R403B, R407C, R407E, R411B, R411A, R407D, R409B, R412A, R401B, R409A, R401A, R414B, R414A, R405A, R406A, R401C, R413A, the R416A of zeotrope class series cold-producing medium; Other optional extractants comprise E125, E170, E143a, R13I1, E218ca12, CE318ccc1, E245cb1, the E329mcc2 etc. of fluoro-ether series; Physical performance datas such as above-mentioned substance code name and molecular formula, critical-temperature, critical pressure see that Cao De wins work " cold-producing medium service manual " P33-37, metallurgical industry publishing house, book number: ISBN 7-5024-3240-X, and GB/T 7778-2001 " cold-producing medium method for numbering serial and security classification ".
Consider the employing low toxicity, the extractant that does not fire has better economy, security, better environmental protection characteristic more preferably adopts following extractant: R22 (dichlorodifluoromethane, Tc=96.2 ℃, Pc=4.99MPa), R23 (fluoroform, Tc=25.9 ℃, Pc=4.84MPa) R134a (1,1,1,2-HFC-134a, Tc=101.1 ℃, Pc=4.06MPa), R124 (2-chloro-1,1,1, the 2-HFC-134a, Tc=122.3 ℃, Pc=3.62MPa), R125 (pentafluoroethane, Tc=66.2 ℃, Pc=3.63MPa), R116 (perfluoroethane, Tc=19.9 ℃, Pc=3.04MPa), R227ea (heptafluoro-propane, Tc=102.8 ℃, Pc=2.98MPa), R218 (octafluoropropane, Tc=71.9 ℃, Pc=2.68MPa), C318 (octafluorocyclobutane, Tc=115.2 ℃, Pc=2.78MPa) a kind of or its composition in.Therefore the critical pressure of above-mentioned preferred supercritical extract agent can reduce the extracting operation pressure and the equipment cost of extraction kettle all less than 5MPa; Above-mentioned in addition halogenated hydrocarbons has low toxicity, the characteristic of not firing and compatibility and the solubility good to first solvent, and extraction efficiency is far above CO
zTherefore supercritical extract adopts preferred extractant to make MIcroporous polyolefin film and has better economic, the feature of environmental protection, practicality.
Adopt extractant of the present invention that the polyolefin of thermally induced phase separation manufacturing and the composite semi-finished product of first solvent are carried out supercritical extract, mainly comprise the steps:
1, the polyolefin micro porous polyolefin membrane semi-finished product of rolling is put into high pressure extraction still, kettle cover is compressed;
2, in described high pressure extraction still, adopt high-pressure pump to pump into extractant, carry out supercritical extract;
3, after extraction finishes, after the extraction kettle step-down, the polyolefin micro porous polyolefin membrane semi-finished product are adopted to vacuumize and carry out drying and handle or adopt the dry processing of hot gas, removal remains in the extractant in the micropore, after dry the processing polyolefin micro porous polyolefin membrane is taken out from extraction kettle.
For a better understanding of the present invention, be further elaborated below.
Adopting inflammable and explosive extractant for example during propane, between the above-mentioned first step and second step, can increase and vacuumize operation and get rid of in extraction kettle, separating still and the pipeline and the air of carrying secretly in the raw material, with blast protection; The operating pressure of supercritical extract is that the critical pressure Pc of extractant is to (Pc+15) MPa scope in above-mentioned second step, preferred extracting operation pressure is that Pc is to (Pc+10) MPa scope, operating pressure is low excessively, extraction efficiency is low, too high extracting operation pressure has little significance to promoting extraction efficiency, increases equipment cost on the contrary; The extracting operation temperature is that the critical temperature Tc of extractant is to (Tm-10) ℃, preferred extracting operation temperature upper limit is (Tm-15) ℃, Tm is the fusing point that adopts the polyolefin micropore film base material of differential thermal analysis (DSC method) mensuration, the extracting operation temperature is low excessively, extraction efficiency is low, the too high semi-finished product fusion that causes easily out of control of operating temperature; The operating pressure of separating still is that normal pressure is to Pc, be limited to 0.5Pc on the operating pressure of preferable separate still, be beneficial to separating of first solvent and extractant like this, the operating temperature of separating still can be less than or equal to the temperature of extraction kettle, first solvent parses from the extractant after the gasification in separating still, and pump drainage comes out at the bottom of the separating still; Extractant after the gasification enters the extractant storage tank and recycles; The flow of extractant can suitably be regulated according to the different of charge and technological temperature with rate of pressure rise, and supercritical extract can adopt the operation pressure of isothermal method, equal-pressure method or separating still and the alternating temperature transformation method that temperature all is lower than extraction kettle.
For reducing the counterdiffusion resistance to mass tranfer between the extractant and first solvent, can use macropore between the every tunic of MIcroporous polyolefin film semi-finished product, the technology dividing plate of porous is kept apart, the MIcroporous polyolefin film semi-finished product are prior compound good macropore before the extraction kettle of packing into, porous, the double-deck parent roll of harvest together behind the carrier ring of lower resistance, dividing plate can adopt the porous material of nonwoven or braiding, as polypropylene, polyester non-woven fabric etc., require separator material to be insoluble to the extractant and first solvent in principle, the structural intergrity that under the technological temperature of supercritical extract, remains intact, the material of dividing plate can have multiple choices, the average pore size of technology dividing plate is more than 50 microns, porosity is at 40-80%, thickness is greater than 0.2mm, and spacer width equates with the MIcroporous polyolefin film semi-finished product or be wide slightly; For preventing the short circuit of extractant through-flow, the parent roll semi-finished product external cylindrical surface of putting into extraction kettle closely contacts with the still wall, and the volume core is not wanted hollow.
After extraction finishes, close high-pressure pump and the extractant inlet shutoff valve that links with extraction kettle, outlet pressure-reducing valve earlier, after extraction kettle is reduced to normal pressure, extractant remaining in the polyolefin micro porous polyolefin membrane semi-finished product that are extracted adopted to vacuumize and carry out dry post processing or adopt that hot gas is dry to be handled, the nitrogen of the preferred inertia of hot gas, when selecting the extractant that does not fire for use, hot gas can adopt clean compressed air, hot gas temperature takes out polyolefin micro porous polyolefin membrane after dry the processing less than (Tm-20) ℃ from extraction kettle.
The specific embodiment
Below enumerate embodiment and further specify the present invention, but the present invention is not subjected to the restriction of embodiment.
Embodiment 1:
The manufacture method of ultra-high molecular weight polyethylene micro-porous film
Material prescription:
The ultra-high molecular weight polyethylene (UHMWPE) of weight average molecular weight (Mw) 2,500,000: 25 parts; Diisooctyl phthalate (DIDP): 70 parts; Polyisobutene PIB:5 part;
Processing method:
(1) above-mentioned raw materials is carried out 95 ℃ of swelling mixed processing earlier 16 hours, be mixed with distributed slurry; By measuring pump slip is imported parallel parallel dual-screw extruding machine then and carry out melting mixing, twin-screw is respectively distinguished temperature and is set to 170,180, and 180,180,180,180 ℃, the smelt gear pump temperature is set to 180 ℃, and die head temperature is set to 180 ℃; Casting film-forming semi-finished product, THICKNESS CONTROL are the 75-80 micron;
(2) then semi-finished product are adopted supercritical extract, extractant adopts cold-producing medium R22, with the microporous polyethylene film semi-finished product and the surface density 75g/m of rolling
2Polypropylene non-woven fabric put into the high pressure extraction still of 260L after compound, kettle cover is compressed; Adopt high-pressure pump in extraction kettle, to pump into extractant, extractant enters after pressurization before the extraction kettle through 110 ℃ of preheater preheatings, extraction kettle shell chuck heating-up temperature is set at 110 ℃, pump into the R22 extractant after the heating, treat to close the outlet pressure-reducing valve after extraction kettle boosts to 6MPa, the extractant inlet shutoff valve, high-pressure pump, extraction kettle shell chuck continues heating 15-60min, again open the outlet pressure-reducing valve then, the extractant inlet shutoff valve, open high-pressure pump and carry out Continuous Flow supercritical extract 10-60min, extracting operation pressure is controlled at 10MPa, and the extraction process temperature is 105 ℃; After the blending agent cooling that utilizes cooler with the extractant and first solvent behind the outlet pressure-reducing valve of extraction kettle, enter separating still, operating pressure in the separating still is controlled at 1MPa, the separating still external jacket adopts 10 ℃ cooling water circulation cooling, separating still inner control temperature is about 30 ℃, extraction is closed high-pressure pump, extractant inlet shutoff valve after finishing; First liquid in the separating still solvent DIDP parses from the extractant after the gasification, and pump drainage comes out to reuse at the bottom of the separating still; Extractant R22 after the gasification enters the extractant storage tank and recycles after cooling; After extraction kettle is reduced to normal pressure, the micro-porous film semi-finished product are adopted to vacuumize and carry out drying processing, removal remains in the extractant in the micropore, after dry the processing polyolefin micro porous polyolefin membrane is taken out from extraction kettle, adopt and clean the weight method assessment repeatedly, first solvent and extractant are residual less than 1% in microporous barrier.
(3) will extract the rolling film uncoiling of first solvent, microporous polyethylene film and polypropylene non-woven fabric are separated after the rolling separately, then the two-way hot-stretch of microporous polyethylene film is strengthened, MD, TD direction are the 4*4 multiplying power and stretch, the hot-stretch temperature is: 110 ℃, heat setting temperature: 115 ℃, obtain the ultra-high molecular weight polyethylene micro-porous film after the cooling rolling, finished product thickness 25-30 micron, average pore size is less than 0.08 micron, porosity 52%, hot strength: MD direction 90MPa, TD direction 68MPa.
Embodiment 2:
The manufacture method of ultra-high molecular weight polyethylene micro-porous film
Extractant adopts cold-producing medium R125, extractant enters after pressurization before the extraction kettle through 95 ℃ of preheater preheatings, extraction kettle shell chuck heating-up temperature is set at 95 ℃, pump into the R125 extractant after the heating, treat to close extractant inlet shutoff valve, high-pressure pump after extraction kettle boosts to 4MPa, extraction kettle shell chuck continues heating 15-60min, again unlatching outlet pressure-reducing valve, extractant inlet shutoff valve, unlatching high-pressure pump carry out Continuous Flow supercritical extract 10-60min then, extracting operation pressure is controlled at 8MPa, and the extraction process temperature is 90 ℃; After the blending agent cooling that utilizes cooler with the extractant and first solvent behind the outlet pressure-reducing valve of extraction kettle, enter separating still, operating pressure in the separating still is controlled at 0.5MPa, the separating still external jacket adopts 10 ℃ cooling water circulation cooling, separating still inner control temperature is about 30 ℃, and all the other are embodiment 1 roughly the same.
Embodiment 3:
The manufacture method of polypropylene micro-porous film
Material prescription:
Polypropylene (PP 3271): 40 parts; Diisooctyl phthalate (DIDP): 55 parts; Polyisobutene PIB:5 part;
Processing method:
(1) above-mentioned raw materials is carried out earlier 110 ℃ of mixed processing 1-2 hours, be mixed with distributed slurry; By measuring pump slip is imported parallel parallel dual-screw extruding machine then and carry out melting mixing, twin-screw is respectively distinguished temperature and is set to 180,220, and 210,210,210,210 ℃, the smelt gear pump temperature is set to 210 ℃, and die head temperature is set to 210 ℃; Casting film-forming semi-finished product, THICKNESS CONTROL are the 30-35 micron;
(2) then semi-finished product are adopted supercritical extract, extractant adopts cold-producing medium R125, with the polypropylene micro-porous film semi-finished product and the surface density 125g/m of rolling
2Polypropylene non-woven fabric put into the high pressure extraction still of 260L after compound, kettle cover is compressed; Adopt high-pressure pump in extraction kettle, to pump into extractant, extractant enters after pressurization before the extraction kettle through 95 ℃ of preheater preheatings, extraction kettle shell chuck heating-up temperature is set at 95 ℃, pump into the R125 extractant after the heating, treat to close the outlet pressure-reducing valve after extraction kettle boosts to 5MPa, the extractant inlet shutoff valve, high-pressure pump, extraction kettle shell chuck continues heating 15-60min, again open the outlet pressure-reducing valve then, the extractant inlet shutoff valve, open high-pressure pump and carry out Continuous Flow supercritical extract 10-60min, extracting operation pressure is controlled at 10MPa, and the extraction process temperature is 90 ℃; After the blending agent cooling that utilizes cooler with the extractant and first solvent behind the outlet pressure-reducing valve of extraction kettle, enter separating still, operating pressure in the separating still is controlled at 0.5MPa, the separating still external jacket adopts 10 ℃ cooling water circulation cooling, separating still inner control temperature is about 30 ℃, extraction is closed high-pressure pump, extractant inlet shutoff valve after finishing; First liquid in the separating still solvent DIDP parses from the extractant after the gasification, and pump drainage comes out to reuse at the bottom of the separating still; Extractant R125 after the gasification enters the extractant storage tank and recycles after cooling; After extraction kettle is reduced to normal pressure, the micro-porous film semi-finished product are adopted to vacuumize and carry out drying processing, removal remains in the extractant in the micropore, after dry the processing polyolefin micro porous polyolefin membrane is taken out from extraction kettle, adopt and clean the weight method assessment repeatedly, first solvent and extractant are residual less than 1% in microporous barrier.
(3) will extract the rolling film uncoiling of first solvent, polypropylene micro-porous film and polypropylene non-woven fabric are separated after the rolling separately, then polypropylene micro-porous film unidirectional heat is stretched and strengthen, the MD direction adopts 2 multiplying powers to stretch, the hot-stretch temperature is: 140 ℃, heat setting temperature: 145 ℃, obtain the polypropylene micro-porous film after the cooling rolling.
Claims (3)
1, a kind of method for preparing polyolefin micro-porous, it is characterized in that adopting thermally induced phase separation to make polyolefin micro porous polyolefin membrane, the polyolefin composition and first solvent is even through the double screw extruder melting mixing, with melt extrude, the gluey plate of cooling forming gelation or film, after will freezing jelly and carrying out hot-stretch reinforcement, thermal finalization and handle, after adopting supercritical extraction method to remove first solvent wherein, the dry processing, the jelly semi-finished product obtain polyolefin micro porous polyolefin membrane to freezing;
This method mainly may further comprise the steps:
(1) the polyolefin micro porous polyolefin membrane semi-finished product of rolling are put into high pressure extraction still, and kettle cover is compressed;
(2) in described high pressure extraction still, adopt high-pressure pump to pump into extractant, carry out supercritical extract, extracting operation pressure be Pc to (Pc+15) MPa scope, the extracting operation temperature is Tc to (Tm-10) ℃;
(3) after extraction finishes, after the extraction kettle step-down, the polyolefin micro porous polyolefin membrane semi-finished product are adopted to vacuumize and carry out drying and handle or adopt that hot gas is dry to be handled, remove and remain in the interior extractant of micropore, after the drying polyolefin micro porous polyolefin membrane is taken out from extraction kettle;
A kind of or its composition: R22 in the cold-producing medium material that extractant is following low toxicity, do not fire is a dichlorodifluoromethane, Tc=96.2 ℃, and Pc=4.99MPa; R23 is a fluoroform, Tc=25.9 ℃, and Pc=4.84MPa; R134a is 1,1,1,2-HFC-134a, Tc=101.1 ℃, Pc=4.06MPa; R124 is a 2-chloro-1,1,1,2-HFC-134a, Tc=122.3 ℃, Pc=3.62MPa; R125 is a pentafluoroethane, Tc=66.2 ℃, and Pc=3.63MPa; R116 is a perfluoroethane, Tc=19.9 ℃, and Pc=3.04MPa; R227ea is a heptafluoro-propane, Tc=102.8 ℃, and Pc=2.98MPa; R218 is an octafluoropropane, Tc=71.9 ℃, and Pc=2.68MPa; C318 is an octafluorocyclobutane, Tc=115.2 ℃, and Pc=2.78MPa;
There is the technology dividing plate to keep apart between the every tunic of polyolefin micro porous polyolefin membrane semi-finished product in the described step (1), the average pore size of technology dividing plate is more than 50 microns, porosity is at 40-80%, thickness is greater than 0.2mm, the technology spacer width equates with the polyolefin micro porous polyolefin membrane semi-finished product or is wide slightly, polyolefin micro porous polyolefin membrane semi-finished product prior double-deck parent roll of harvest together behind the compound good technology dividing plate before the extraction kettle of packing into, the technology dividing plate adopts the porous material of nonwoven or braiding; The parent roll semi-finished product external cylindrical surface of putting into extraction kettle closely contacts with the still wall, and the volume core is hollow not.
2, method for preparing polyolefin micro-porous according to claim 1 is characterized in that, in the described step (2), extracting operation pressure be Pc to (Pc+10) MPa scope, the extracting operation temperature is Tc to (Tm-15) ℃; The operating pressure of separating still be normal pressure to Pc, the operating temperature of separating still is smaller or equal to the temperature of extraction kettle, first solvent parses from the extractant after the gasification in separating still, pump drainage comes out at the bottom of the separating still; Extractant after the gasification enters the extractant storage tank and recycles.
3, method for preparing polyolefin micro-porous according to claim 2 is characterized in that, in the described step (2), is limited to 0.5Pc on the operating pressure of separating still.
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| CN102532583A (en) * | 2010-12-20 | 2012-07-04 | 天津东皋膜技术有限公司 | Gas-liquid two-phase high pressure extraction method for manufacturing rolled polyolefin microporous membranes or sheets |
| CN102153776B (en) * | 2011-01-04 | 2013-04-03 | 沈勇 | Method for preparing porous film by adopting high molecular weight polyolefin and product and application thereof |
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| CN103127835B (en) * | 2011-11-23 | 2016-02-24 | 天津东皋膜技术有限公司 | Rolling polyolefin micro porous polyolefin membrane expansion high-pressure cleaning device and cleaning method |
| CN103178227B (en) * | 2011-12-22 | 2016-05-11 | 天津东皋膜技术有限公司 | There is the micro-porous septum of polyethylene based composition of heat pressure adhesive characteristic |
| CN103184013A (en) * | 2011-12-28 | 2013-07-03 | 天津东皋膜技术有限公司 | Polyvinyl composite microporous membrane with thermocompression bonding characteristic |
| CN103422184A (en) * | 2012-05-23 | 2013-12-04 | 北京航空航天大学 | Preparation method of porous fiber with high specific surface area |
| CN104667568B (en) * | 2015-02-10 | 2016-10-05 | 宁波格林美孚新材料科技有限公司 | A kind of saturation equipment |
| CN111081948A (en) * | 2019-12-26 | 2020-04-28 | 江苏厚生新能源科技有限公司 | Preparation method of high linear velocity-large width polyethylene diaphragm |
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Denomination of invention: Method for polyolefin porous film mfg. method Effective date of registration: 20170426 Granted publication date: 20100203 Pledgee: Beijing Sojo Electric Co., Ltd. Pledgor: Tianjin DG Membrance Tech. Co., Ltd. Registration number: 2017120000021 |
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