WO2002092673A1 - Modifikation von verstreckten folien - Google Patents
Modifikation von verstreckten folien Download PDFInfo
- Publication number
- WO2002092673A1 WO2002092673A1 PCT/EP2002/005256 EP0205256W WO02092673A1 WO 2002092673 A1 WO2002092673 A1 WO 2002092673A1 EP 0205256 W EP0205256 W EP 0205256W WO 02092673 A1 WO02092673 A1 WO 02092673A1
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- WO
- WIPO (PCT)
- Prior art keywords
- membrane
- film
- polymer
- groups
- stretching
- Prior art date
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- IJAPPYDYQCXOEF-UHFFFAOYSA-N phthalazin-1(2H)-one Chemical compound C1=CC=C2C(=O)NN=CC2=C1 IJAPPYDYQCXOEF-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
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Definitions
- Stretched foils have been used in technology for more than 20 years.
- Polypropylene or polyethylene films formed by extrusion are widely used in applications such as food packaging, food containers and the like.
- Stretched polypropylene films, in particular biaxially stretched polypropylene films are widely used in packaging materials because of their excellent mechanical and optical properties. They are generally made by sequential biaxial stretching using a jig.
- stretched films with inorganic fillers have been used as breathable films for diaper films.
- the pore diameter of the very inexpensive films used here is, however, by orders of magnitude too large to be used by these films for applications that require dense membranes, e.g. could be used in the fuel cell.
- the present invention relates to membranes based on stretched films.
- the above object can be achieved by a stretched polymer film comprising (A) a polymer or polymer blend, and at least (B) another component with an average particle diameter of 0.1 to 15 ⁇ m, which by (C) one or more post-treatment steps, is processed into a membrane after stretching.
- the average particle diameter of component (B) is in the range from 0.1 to 15 ⁇ m. It is preferably 0.5-8.0 ⁇ m, and the range of 1.0-7.0 ⁇ m is particularly preferred. If the diameter is less than 0.1 ⁇ m, secondary agglomeration occurs, and the resulting particles sometimes have large diameters, which usually lead to the film tearing in the stretching process. There is no particular limitation on the shape of the particles. However, spherical particles are preferred.
- the proportion of component (B) in the undrawn film is 2 to 80 percent by weight, 10 to 70 percent by weight is preferred, and 20 to 60 percent by weight is particularly preferred.
- the proportion by weight of polymeric component (A) is correspondingly 98 to 20 percent by weight before stretching, 90 to 30 percent by weight is preferred, and 80 to 40 percent by weight is particularly preferred.
- the process comprises a simple mixing process. The mixing process can be done by adding component (B) into the molten component (A).
- the mixing process can take place using a screw extrusion kneading device (for example an extruder with a screw or an extruder with twin screws), a Banbury mixer, a continuous mixer and a mixing roller or the like.
- a screw extrusion kneading device for example an extruder with a screw or an extruder with twin screws
- a Banbury mixer for example an extruder with a screw or an extruder with twin screws
- a suitable solvent or solvent mixture Any solvent in which component (A) dissolves and which is at the same time not a solvent for component (B) is suitable.
- Preferred solvents are water and aprotic solvents, such as tetrahydrofuran (THF), dimethyl sulfoxide (DMSO), N-methyl-pyrrolidone (NMP), sulfolane and dimethylacetamide (DMAc).
- THF tetrahydrofuran
- DMSO dimethyl sulfoxide
- the film obtained is a composite film or composite membrane.
- Component (B) is distributed in the matrix of component (A).
- the residual solvent content of the undrawn film is between two and thirty percent by weight, the range between five and twenty percent by weight of solvent in the undrawn film being particularly preferred.
- the stretched composite film according to the invention can be subjected to surface treatments, such as corona discharge, plasma treatment and the like, on one or both sides, before or after the aftertreatment (C), as required.
- surface treatments such as corona discharge, plasma treatment and the like
- the stretched composite film according to the invention can be coated or laminated on one or both sides with a layer of a polymer or polymer mixture which optionally carries functional groups, solvents or solvents. Specify functional groups.
- the stretched film which has not yet been aftertreated by process (C) and contains components (A) and (B), can be produced by any known process without any restriction.
- a stretched composite film can be produced, for example, by a process which comprises the following stages: melt extrusion according to a T-die process, a composition of a fusible component (A) containing a particulate component (B) which is not fusible at the same temperature and loading the extrudate through a cooling roller, combined with an air knife or by splitting rollers with film formation.
- the production of a biaxially stretched film by subsequent biaxial stretching using a spam device is preferably carried out according to a method comprising forming a film or a film from the composition described above according to a T-nozzle method or according to an inflation method or the like, and then the The film or the film is passed into a longitudinal stretching device for a longitudinal stretching of 0.5 to 10 times (expressed as a mechanical draw ratio) with a heating roller temperature of 100 to 380 ° C, preferably 120 to 350 ° C and particularly preferably 130 ° to 250 ° C.
- the monoaxially stretched film is then subjected to transverse stretching 0.5 to 15 times using a tensioner at a tensioner temperature of 100 to 380 ° C, preferably 120 to 350 ° C, and most preferably 130 ° to 250 ° C.
- the resulting biaxially stretched film is further subjected, if necessary, to a heat treatment at 80 to 380 ° C. (a transverse relaxation of 0-25% is permitted with this heat treatment).
- a further stretching can take place after the stretching above.
- With longitudinal stretching it is possible to combine multi-stage stretching, rolling, drawing, etc. Monoaxial stretching can be used alone to obtain a stretched film.
- Particulate component (B) can be organic or inorganic.
- the condition for the particulate component (B) is that in the subsequent stretching process a gap or a free space is formed around the preferably spherical particle (Fig. 1).
- the preferably spherical particle is located in a cavity after the stretching process, or if the film has an appropriate thickness, a pore has formed around the particulate component (B). If enough cavities border on each other and their cross-sections intersect, a continuous path or path is created from one side of the film to the other side, which ultimately also represents a pore.
- Component (B) remains in the film after stretching.
- a second path is created in the film by stretching.
- the first path or the first phase is the polymer (A) from which the film is made.
- the second path or phase is the voids that have been created by the stretching process.
- the particulate component (B) is located in the cavities.
- a continuous phase from one side to the other is to be understood as a path.
- a real percolation must be possible so that the path or phase is continuous. This means that a permitting substance, a liquid (e.g. water), a gas or ion must be able to penetrate from one side to the other.
- the cavity is filled, the properties of the new path depend on the "filling material". If the filling material is ion-conducting, the entire path is ion-conducting. It is important that the path is continuous.
- the particulate component (B) is all inorganic substances which form layer structures or framework structures.
- Layered and / or framework silicates are particularly preferred. All synthetic and natural zeolites are preferred among the framework silicates.
- the inorganic component (B) is a layered silicate, it is based on montmorillonite, smectite, illite, sepiolite, palygorskite, muscovite, allevardite, amesite, hectorite, talc, fluorochemical, saponite, beidelite, nontronite, stevensite, bentonite, mica , Vermiculite, fluor vermiculite, halloysite, fluorine-containing synthetic talc or mixtures of two or more of the layered silicates mentioned.
- the layered silicate can be delaminated or pillarted. Montmorillonite is particularly preferred. The protonated form of the layered and / or framework silicates is also
- component (B) which contains layer and / or framework structures, is functionalized before stretching and / or after stretching. If the functionalization takes place after stretching, it is part of the aftertreatment (C). In a preferred embodiment, the layered and / or framework silicates are functionalized before or after stretching.
- Layered silicate is generally understood to mean silicates in which the SiO 4 tetrahedra are connected in two-dimensional infinite networks. (The empirical formula for the anion is (Si 2 O 5 2 " ) n). The individual layers are connected to each other by the cations lying between them, whereby mostly Na, K, Mg, Al or / and Ca in the natural occurring layered silicates.
- a functionalized layered or framework silicate should be understood to mean layered or framework silicates in which the layer spacings are initially increased by incorporation of molecules by reaction with so-called functionalizing agents.
- 100 angstroms preferably 5 to 50 and in particular 8 to 20 angstroms.
- the layered or framework silicates (before or after the production of the composites according to the invention) are so-called functionalizing
- Hydrophobing agents implemented which are often referred to as onium ions or onium salts.
- the incorporation of organic molecules often also has one
- the cations of the layered or framework silicates are functionalized by organic ones
- Hydrophobing agent replaced, the desired chemical functionalization inside and / or on the surface of the silicate can be determined by the nature of the organic residue.
- the chemical functionalization depends on the type of functionalizing molecule, oligomer or polymer that is to be incorporated into the layered silicate.
- the cations can be exchanged completely or partially. A complete exchange of the cations, metal ions or protons is preferred.
- Amount of exchangeable cations, metal ions or protons is usually in
- IEC Ion exchange capacity
- Suitable organic functionalizing water repellents are derived from oxonium, ammonium, phosphonium and sulfonium ions, which can carry one or more organic radicals.
- Suitable functionalizing hydrophobizing agents are those of the general formula I and / or II:
- R1, R2, R3, R4 independently of one another are hydrogen, a straight-chain branched, saturated or unsaturated hydrocarbon radical having 1 to 40, preferably 1 to 20, carbon atoms.
- Atoms which optionally carry at least one functional group or 2 of the radicals are connected to one another, in particular to form a heterocyclic radical with 5 to 10 carbon atoms.
- Atoms particularly preferably with one and more N atoms
- Y for oxygen, sulfur or carbon
- n for an integer from 1 to 5, preferably 1 to 3 and
- Z stands for an anion
- Suitable functional groups are hydroxyl, nitro, phosphonic or
- Sulfonic acid groups carboxyl and sulfonic acid groups being particularly preferred.
- Sulfonic acid chloride and carboxylic acid chlorides are also particularly preferred.
- Suitable anions Z are derived from proton-providing acids, in particular mineral acids, with halogens such as chlorine, bromine, fluorine, iodine, sulfate, sulfonate, phosphate, phosphonate, phosphite and carboxylate, in particular acetate, being preferred.
- the layered and / or framework silicates used as starting materials are usually in
- the preferred suspending agent is water, optionally in a mixture with alcohols, in particular lower alcohols with 1 to 3
- the solvent is preferred in that it dissolves. This is particularly an aprotic one
- Solvent Other examples of suspending agents are ketones and hydrocarbons.
- Layered silicate usually fails from solution.
- the metal salt formed as a by-product of the ion exchange is preferably water-soluble, so that the hydrophobicized layered silicate as a crystalline solid by e.g. Filtering can be separated.
- the layered or framework silicate before the functionalization is the layered or framework silicate before the functionalization, of course, as a solid.
- the cation exchange takes place by post-treatment of the stretched film in a solution containing the functionalizing substances.
- the cations originally bound to the silicate are removed either using the same solvent or a suitable different solvent in a second step. It is also possible to fix the cations originally bound to the silicate as a solid, in particular as a sparingly soluble salt in and on the silicate surface. This is often the case when the cation originally bound to the silicate is a divalent, trivalent or tetravalent cation, in particular a metal cation. Examples include Ti, Zr, ZrO and TiO 2+ .
- the ion exchange is largely independent of the reaction temperature.
- the temperature is preferably above the crystallization point of the medium in which the functionalizing substances are located and below its boiling point. In aqueous systems, the temperature is between 0 and 100 ° C, preferably between 40 and 80 ° C.
- Alkylammonium ions are preferred as functionalizing agents, especially when a carboxylic acid chloride or sulfonic acid chloride is additionally present as a functional group on the same molecule.
- the alkylammonium ions can be obtained via customary methylation reagents, such as methyl iodide. Suitable ammonium ions are alpha-omega-aminocarboxylic acids, particularly preferred
- N-alkyl-aryl-SO 2 XX C1; Br; J; F
- Aminoalkylarylsulfonic acids N ⁇ A.lkyl-aryl-SO 3 Me + 1 / + 2 / + 3 / + 4
- RR Me metal or H or ZrO 2+ or TiO 2+
- Me metal or H or Zr0 2+ or TiO 2+ and the alpha-omega-alkylaminosulfonic acid halides
- ammonium ions are pyridine and laurylammonium ions.
- the layered silicates After the functionalization, the layered silicates generally have a layer spacing of
- the hydrophobized and functionalized layered silicate is freed of water by drying.
- the layered silicate treated in this way contains one more
- Layered silicate as a suspension in a water-free suspending agent is mixed with the mentioned polymers and processed into a film.
- this can functionalized layered or framework silicate are added to the melt.
- Preference is given to adding unmodified layered or framework silicates to the melt and functionalizing the silicates after stretching. This is particularly preferred if the extrusion temperature is above the destruction temperature of the functionalizing substances.
- a particularly preferred functionalization of the framework and / or layered silicates is carried out with modified dyes or their precursors, especially with triphenylmethane dyes. They have the general formula:
- dyes which are derived from the following basic structure:
- the radicals R can independently of one another be hydrogen, a group having 1 to 40 carbon atoms, preferably a branched or unbranched alkyl, cycloalkyl or an optionally alkylated aryl group which optionally contain one or more fluorine atoms.
- the radicals R can likewise independently of one another correspond to the radicals Rl, R2, R3 or R4 with the functional groups from the above-mentioned general formulas (I) and (II) for functionalizing hydrophobizing agents.
- an aprotic solvent eg tetrahydrofuran, DMAc, NMP
- Layered silicates intercalated The intercalation must be of the type that is ion-conducting
- Group is on the surface of the silicate particle.
- the layered silicate functionalized in this way is added to the polymer solution as described in application DE10024575.7.
- the functionalization of the layered or framework silicates can also be carried out again via a cation exchange in the stretched film. It has proven to be particularly advantageous to use the precursor of the dyes. Only in a subsequent oxidation by an acidic aftertreatment are the actual dyes formed by the elimination of water. In the case of triphenylmethane dyes, it was surprisingly found that a
- Proton conduction is supported in the membranes made from it. It cannot be said with sufficient certainty whether it is even a water-free proton line. If the dyes are not bound to the silicate, ie if they are in free form in a stretched membrane, they are discharged with the water of reaction in the fuel cell after a short time.
- the polymer mixtures containing sulfinate groups from the parent application mentioned above, particularly preferably the thermoplastic functionalized polymers (ionomers), are added to the suspension of the hydrophobized phyllosilicates. This can be done in already dissolved form or the polymers themselves are brought into solution in the suspension.
- the proportion of layered silicates is generally between 1 and 70% by weight. Especially between 2 and 40% by weight and especially between 5 and 15% by weight.
- a further improvement compared to the parent application is the additional mixing of zirconyl chloride (ZrOCl 2 ) into the membrane polymer solution and into the cavities of the layer and / or framework silicates.
- ZrOCl 2 zirconyl chloride
- the aftertreatment of the membrane is carried out in phosphoric acid, sparingly soluble zirconium phosphate precipitates in the immediate vicinity of the silicate grain.
- Zirconium phosphate shows its own proton conductivity during operation of the fuel cell. Proton conductivity functions as intermediate steps via the formation of the hydrogen phosphates and is state of the art.
- the targeted introduction in the immediate vicinity of a water reservoir (silicates) is new.
- the stretched, microporous film containing a particulate component (B) is subjected to one or more post-treatments (C).
- the microporous film contains layered and / or framework silicates. These are now functionalized in one or more steps.
- the functionalized filler especially zeolites and representatives of the Glasgowlith range and bentonites, is the only ion-conducting component, its weight fraction is generally between 5 and 80%, especially between 20 and 70% and especially in the range of 30 to 60% by weight.
- component (A) of the composite membranes according to the invention are defined as follows:
- Polyolefins such as polyethylene, polypropylene, polyisobutylene, polynorbornene,
- Polymethylpentene, poly (l, 4-isoprene), poly (3,4-isoprene), poly (l, 4-butadiene), poly (l, 2-butadiene) styrene (co) polymers such as polystyrene, poly (methylstyrene), Po_y ( ⁇ , ⁇ , ß-trifluorostyrene), poly (pentafluorostyrene) perfluorinated ionomers such as National® or the SC ⁇ Hal precursor from National® (Hal F, Cl, Br, I), Dow® membrane, GoreSelect®- Membrane.
- N-based polymers such as polyvinylcarbazole, polyethyleneimine, poly (2-vinylpyridine), poly (3-vinylpyridine), poly (4-vinylpyridine)
- (Het) aryl main chain polymers such as:
- Polyether ketones such as polyether ketone PEK Victrex®, polyether ether ketone PEEK Victrex®,
- Polyether sulfones such as polysulfone Udel®, polyphenyl sulfone Radel R®,
- Polymer side chain may be present
- Polyphenylene ethers such as B. Poly (2,6-dimet_ ⁇ yloxyphenylene), poly (2,6-diphenyloxyphenylene)
- Phenyloxy-1,4-benzoyl groups can be modified.
- Type A polymers (polymers with cation exchange groups or their non-ionic precursors): Polymer type A includes all polymers that are derived from the above. Main polymer chains (1) and the following cation exchange groups or their nonionic precursors:
- S0 3 H, S0 3 Me; P0 3 H 2 , P0 3 Me 2 or S0 2 X, POX 2 are preferred as functional groups.
- the strongly acidic sulfonic acid groups or their nonionic precursors are particularly preferred as functional groups.
- Aryl main chain polymers are preferred as polymer main chains. Poly (ether ketones) and poly (ether sulfones) are particularly preferred.
- Type B polymers (polymers with N-basic groups and / or anion exchange groups):
- Polymer type A includes all polymers that are derived from the above.
- Main polymer chains (1) exist and the following
- Anion exchange groups or their nonionic precursors (with primary, secondary, tertiary basic
- the main polymer chains are (het) aryl main chain polymers such as poly (ether ketones), poly (ether sulfones) and
- Type C polymers polymers with crosslinking groups such as sulfinate groups and / or unsaturated groups:
- Polymer type C includes all polymers from the 0 g. Main polymer chains (1) and crosslinking groups exist. Networking groups are for example:
- crosslinking reactions (III) and (IV) and (V) are preferred, in particular the crosslinking reaction (III). •
- Type D polymers (polymers with cation exchange groups and anion exchange groups and / or basic N groups and / or crosslinking groups):
- the polymer type (5) includes polymers which can contain the main chains from (1) and can carry various groups : the cation exchange groups listed in (2) or their nonionic precursors and the anion exchange groups listed in (3) or primary, secondary or tertiary N-basic groups and / or the crosslinking groups listed in (4).
- the following combinations are possible: Polymer Dl: polymer with cation exchanger groups or their nonionic precursors and with
- Polymer D2 Polymers with cation exchanger groups or their nonionic precursors and with
- Crosslinking groups polymer D3 polymers with anion exchange groups and / or N-basic groups and with
- Crosslinking groups polymer D4 polymer with cation exchanger groups or their nonionic precursors and with
- Anion exchanger groups and / or N-basic groups and with crosslinking groups The following describes how stretched films that have an inorganic particulate
- Component (B) are treated in such a way that membranes for them
- a meltable stretchable polymer e.g. Polypropylene is composed with an inorganic particulate component (B), preferably a component containing layer and / or framework structures, in particular a layer and / or framework silicate with an average particle size of 5-10 ⁇ .
- B inorganic particulate component
- Composing should be understood to mean that the polymer becomes intimate in the melt with the inorganic component, here the
- Silicate mixed.
- a common method is to mix the components in the
- Twin-screw extruder The result is a composite, here silicate in polypropylene.
- Bentonite montmorillonite is used as a silicate component as an example. However, this does not mean any special restriction to bentonites.
- the film is now stretched as described above using known methods.
- the stretched film now represents a microporous membrane.
- the pore size is dependent on the grain size, elongation properties of the polymer and on the tensile forces that occur during the
- Stretching was applied. As a tight membrane, it is completely unusable. Gases e.g. penetrate almost unhindered.
- An organically modified clay or zeolite is used in the membranes according to the invention.
- Bentonites are clays and montmorillonite is a special bentonite. Montmorillonite is preferred. However, all other substrates into which low-molecular compounds can intercalate can also be used. Montmorillonite is able to bind molecules by intercalation. Montmorillonite is modified so that a strongly basic component protrudes from the particle or is on the particle surface.
- the organic component preferably contains nitrogen. Heterocycles are particularly preferred, and imidazoles and
- Guanidine derivatives This is not meant to be a limitation to these two classes of substances. Any other class of substance that contains a strong terminal base is also possible.
- This organically modified montmorillonite is compounded with the polymer, extruded into a film and then stretched.
- polypropylene up to 70%
- the film has now become a dense proton-conducting membrane and can already be used as such in a fuel cell in this state.
- the membrane is immersed in zirconium oxide chloride solution according to the invention. insoluble
- Zirconium phosphate precipitates at the phase boundary with the membrane and in the membrane itself.
- This membrane is suitable for use in the fuel cell.
- thermoplastics e.g. Polysulfone or Vectra
- the membrane formed from it can be used for the PEM fuel cell.
- the advantage of the method according to the invention is that the film is extruded and is not pulled out of a solvent.
- the above-mentioned process with polymer stretched to form a film, organically modified clay, imidazole, phosphoric acid and subsequent partial precipitation to zirconium phosphate is only one exemplary specific example of the basic invention.
- a second path is created in the film by stretching.
- the first path is the polymeric component (A) from which the film itself is made up.
- the second path is the voids or pores that have been created by the stretching process.
- a path should be understood as a continuous path from one side to the other. A real percolation must be possible so that the path is continuous. That is, water vapor e.g. must be able to penetrate from one side to the other. If the cavity is filled, the properties of the new path depend on the "filling material". If the filling material is ion-conducting, the entire path is ion-conducting. It is important that the path is continuous.
- the film before stretching can be produced by extrusion. However, it is also possible to produce the film from a solvent.
- Extrusion requires the polymer to melt. Most functionalized polymers cannot be extruded without significant disadvantages. If the polymer contains sulfonic acid groups or chemical precursors such as sulfochlorides, the polymer degenerates before it melts. In such cases, production via a solvent-containing process is preferred.
- This film is now stretched and the resulting second path is filled with a proton-conducting substance at a higher temperature (T> 80 ° C).
- This filling can e.g. This enables the microporous membrane to be treated alternately in phosphoric acid and zirconium oxide chloride (ZrOCl). This process can be repeated until no more zirconium phosphate fails in the membrane. Precipitation of zirconium phosphate is only one possibility.
- a polymer e.g. a sulfonated polyether ketone or polysulfone is used.
- the proton line mainly works via the polymeric sulfonic acid swollen in water and over the temperature range above it via the inorganic proton conductor. A smooth transition takes place.
- the concept of the two paths is reduced to an unfinished microporous membrane, which is adapted to the desired application in a second modification step.
- They are two membranes that are put together to form one membrane without disturbing their membrane function.
- Another vivid picture is a textile material that was woven from two yarns of different colors. Where you can choose the yarns in a very wide range. However, one yarn was subsequently inserted into the finished homogeneous fabric.
- component (A) is a meltable polymer without degradation and that particulate component (B) is a layered or framework silicate with an average size of 0.1 to 15 ⁇ m.
- a microporous film is obtained by extrusion of a composite which contains components (A) and (B) with subsequent stretching.
- This microporous film is post-treated in a solution that contains molecules that have at least two functional groups in the same molecule.
- One of the functional groups in the molecule has a positive charge, preferably a positive nitrogen atom.
- the positive nitrogen intercalates into the layer or framework structures of the silicate.
- a cation exchange takes place.
- the acidic silicate also creates a nitrogen cation that intercalates into the silicate.
- the cation exchange on the silicate can take place completely or partially.
- the resulting membrane is already sufficiently sealed for certain membrane applications, such as alkene-alkane separation.
- the remaining functional group not intercalated in the layered or framework silicate can be a preliminary stage of an ion-conducting group.
- an ion-conducting group for example sulfonic acid chlorides, carboxylic acid chloride or phosphonic acid chlorides.
- precursors of cation or anion exchanger groups are mentioned further above.
- these precursors are converted into a group that supports selective permeation. This is e.g. in the case of sulfonic acid halides, hydrolysis takes place in an acidic, neutral or alkaline medium.
- the stretched film is alternately coated with a polyvalent metal salt e.g. Ti4 +, Zr4 +, Ti3 +, Zr3 +, TiO2 +, ZrO2 + and an acid, which can be low or high molecular weight.
- Particularly preferred acids are phosphoric acid and sulfuric acid diluted with water.
- the phosphoric acid has a concentration of 1-85% by weight. A concentration of 20 to 80% by weight is preferred.
- the sulfuric acid has a concentration of 1 to 80% by weight. A concentration of 20 to 50% by weight is preferred.
- the process of picking up a poorly soluble proton conductor in the membrane can be repeated several times.
- any substance can be used as the inorganic component which, when stretched, results in free spaces being formed around this substance (see Fig. 1: Process of cavity formation by stretching). It is also not absolutely necessary that the component must be inorganic. As already mentioned, the only condition is that a free space has formed around the particle after stretching.
- the stretching can be mono or biaxial. Biaxial stretching is preferred. However, monoaxial stretching is also sufficient for use in hollow fibers.
- stretching over the third spatial direction is also possible, i.e. triaxial.
- the composite extruded to the film is held in the plane by means of vacuum nozzles and a plate is placed from above, which can also draw a vacuum through small pores.
- the film is now fixed between two plates. If you now pull the two plates apart, with the vacuum applied, and choose the distance so that the film does not tear but only stretches, you get a film that has been stretched across the thickness.
- the invention is also used in electrodialysis.
- the microporous stretched membrane consists of a cation exchanger and the second path consists of an anion exchanger, optionally with proton leaching, for example described in DE 19836514 AI (Fig. 3; drawings on page 2). If this membrane is held in an electric field, the water dissociates into protons and hydroxyl ions. According to the electric field, the protons migrate via the cation exchange path to the cathode and the hydroxyl ions (OH " ) via the anion exchange path to the anode. In this way, membranes for electrodialysis can be produced very cheaply and easily.
- the paths can also be swapped. Then first an anion exchange membrane or a chemical precursor of the anion exchange group is stretched and the second path is now a cation exchange membrane. The modification of the inorganic component must be chosen accordingly.
- organically modified particles e.g. montmorillonite
- the continuous path is formed by stretching and then filled with the ion conductor.
- Component (B) which contains particulate inorganic layer or scaffold structures, turns a chemical substance of the general formula for hydrophobizing functionalizing agents (I) or (II) that is otherwise movable or volatile under the conditions of use of a membrane over a technically applicable period in the micro-porous film fixed so that it can be used in membrane applications.
- a "raw" membrane can be produced in large existing systems, which are modified in a second step depending on the application.
- membranes for desalination can be produced very inexpensively.
- the basic polymer is e.g. Polypropylene used.
- the inorganic component e.g. Montmorillonite is previously organically modified so that a charged group remains on the surface. This can e.g. done with an alpha-omega aminosulfonic acid. After stretching, the result is a charged microporous membrane. This is suitable for reverse osmosis.
- crosslinking reactions can also be carried out within the pores via terminal crosslinkable groups of the functionalizing agents. This can be covalent and / or ionic crosslinking.
- Another application is the use in alkene-alkane separation.
- Silver nitrate solution is a poorly soluble complex. It has now surprisingly been found that when this complex is located in a membrane, it is capable of reversibly binding alkenes to it.
- Alkane mixtures Water or an aprotic solvent can be used as the solvent for the silver salt Solvents are used.
- Alkenes and olefins permit water-free through such a membrane with a technically applicable flow rate.
- An improvement in the flow numbers is achieved by inserting organically modified montmorillonite with heterocyclic nitrogen on the surface, which has at least one lone pair of electrons, for example a terminal imidazole group. The membrane is carefully stretched and then placed in silver salt solution. Stretching creates channel structures in the membrane that facilitate transport.
- an unmodified polymer e.g. Polypropylene is stretched with organically modified montmorillonite. Montmorillonite again has terminal imidazole or pyridine groups on its surface. After stretching, the microporous membrane is placed in a solution containing silver ions. The membrane is then suitable for the alkene-Akan separation. The membrane is suitable for the separation of low molecular weight substances in which one component of the mixture contains a double bond, which form a reversible complex with silver ions. The separation of low molecular weight olefin / alkane mixtures is particularly preferred. The montmorillonite need not necessarily be modified. Polypropylene is composed with montmorillonite and stretched.
- the porous film is then aftertreated in a solution which contains aromatic nitrogen with at least one lone pair of electrons.
- the solvent can be any suitable solvent or solvent mixture. Water and aprotic solvents are preferred. It is only important that the corresponding nitrogen-containing molecule penetrates into the clay cavities and fills the pores.
- the membrane is post-treated in a solution containing silver or copper ions. Anything that keeps silver or copper ions in solution is suitable as a solvent. Water and aprotic solvents such as DMSO, NMP and THF are particularly preferred. As a result, the nitrogen-silver ion complex or the nitrogen-copper ion complex fails in the membrane. This process can be repeated several times if necessary.
- the membrane is now suitable for water-free alkene-alkane separation.
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Abstract
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Priority Applications (15)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020097020575A KR101005674B1 (ko) | 2001-05-11 | 2002-05-13 | 연신 필름의 변형 |
JP2002589551A JP4154244B2 (ja) | 2001-05-11 | 2002-05-13 | 延伸フィルムの改良 |
DE50210461T DE50210461D1 (de) | 2001-05-11 | 2002-05-13 | Modifikation von verstreckten folien |
US10/477,174 US8079480B2 (en) | 2001-05-11 | 2002-05-13 | Modification of drawn film |
AU2002342310A AU2002342310B2 (en) | 2001-05-11 | 2002-05-13 | Modification of drawn film |
DE10292065T DE10292065D2 (de) | 2001-05-11 | 2002-05-13 | Modifikation von verstreckten Folien |
CA2446881A CA2446881C (en) | 2001-05-11 | 2002-05-13 | Modification of stretched films |
EP02743003A EP1392765B1 (de) | 2001-05-11 | 2002-05-13 | Modifikation von verstreckten folien |
KR10-2003-7014681A KR20040008173A (ko) | 2001-05-11 | 2002-05-13 | 연신 필름의 변형 |
ZA2004/00186A ZA200400186B (en) | 2001-05-11 | 2004-01-12 | Modification of drawn film |
AU2008229666A AU2008229666A1 (en) | 2001-05-11 | 2008-09-28 | Modification of drawn film |
AU2009200145A AU2009200145A1 (en) | 2001-05-11 | 2009-01-09 | Modification of drawn film |
AU2009201729A AU2009201729A1 (en) | 2001-05-11 | 2009-04-30 | Modification of drawn film |
US13/329,112 US9126147B2 (en) | 2001-05-11 | 2011-12-16 | Modification of drawn film |
US14/846,902 US20150376360A1 (en) | 2001-05-11 | 2015-09-07 | Modification of drawn film |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10122814.7 | 2001-05-11 | ||
DE10122814 | 2001-05-11 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US10477174 A-371-Of-International | 2002-05-13 | ||
US10/477,174 A-371-Of-International US8079480B2 (en) | 2001-05-11 | 2002-05-13 | Modification of drawn film |
US13/329,112 Division US9126147B2 (en) | 2001-05-11 | 2011-12-16 | Modification of drawn film |
Publications (1)
Publication Number | Publication Date |
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WO2002092673A1 true WO2002092673A1 (de) | 2002-11-21 |
Family
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PCT/EP2002/005256 WO2002092673A1 (de) | 2001-05-11 | 2002-05-13 | Modifikation von verstreckten folien |
Country Status (12)
Country | Link |
---|---|
US (3) | US8079480B2 (de) |
EP (2) | EP1392765B1 (de) |
JP (2) | JP4154244B2 (de) |
KR (2) | KR20040008173A (de) |
CN (1) | CN1527859A (de) |
AT (1) | ATE366771T1 (de) |
AU (4) | AU2002342310B2 (de) |
CA (1) | CA2446881C (de) |
DE (2) | DE10292065D2 (de) |
ES (1) | ES2292774T3 (de) |
WO (1) | WO2002092673A1 (de) |
ZA (1) | ZA200400186B (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2869032A1 (fr) * | 2004-04-15 | 2005-10-21 | Commissariat Energie Atomique | Procede de preparation de particules d'argile conductrices de protons et materiau comprenant de telles particules |
WO2006097603A1 (fr) * | 2005-03-16 | 2006-09-21 | Institut National Polytechnique De Grenoble | Extrusion d'un polymere thermoplastique portant des groupements ioniques acides |
WO2006097602A1 (fr) * | 2005-03-16 | 2006-09-21 | Institut National Polytechnique De Grenoble | Preparation d'une membrane par extrusion d'un polymere thermoplastique portant des groupements ioniques alcalins. |
KR101123589B1 (ko) * | 2003-11-06 | 2012-03-20 | 테크놀로지안 투트키무스케스쿠스 브이티티 | 다공성 플라스틱 필름의 제조방법 및 플라스틱 필름 |
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- 2002-05-13 AT AT02743003T patent/ATE366771T1/de active
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- 2002-05-13 DE DE10292065T patent/DE10292065D2/de not_active Expired - Lifetime
- 2002-05-13 DE DE50210461T patent/DE50210461D1/de not_active Expired - Lifetime
- 2002-05-13 JP JP2002589551A patent/JP4154244B2/ja not_active Expired - Fee Related
- 2002-05-13 EP EP02743003A patent/EP1392765B1/de not_active Expired - Lifetime
- 2002-05-13 EP EP20070013532 patent/EP1884534A3/de not_active Withdrawn
- 2002-05-13 ES ES02743003T patent/ES2292774T3/es not_active Expired - Lifetime
- 2002-05-13 CN CNA02814015XA patent/CN1527859A/zh active Pending
- 2002-05-13 KR KR10-2003-7014681A patent/KR20040008173A/ko not_active Application Discontinuation
- 2002-05-13 KR KR1020097020575A patent/KR101005674B1/ko active IP Right Grant
- 2002-05-13 CA CA2446881A patent/CA2446881C/en not_active Expired - Fee Related
-
2004
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2007
- 2007-05-21 JP JP2007134592A patent/JP2007262419A/ja active Pending
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2008
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101123589B1 (ko) * | 2003-11-06 | 2012-03-20 | 테크놀로지안 투트키무스케스쿠스 브이티티 | 다공성 플라스틱 필름의 제조방법 및 플라스틱 필름 |
FR2869032A1 (fr) * | 2004-04-15 | 2005-10-21 | Commissariat Energie Atomique | Procede de preparation de particules d'argile conductrices de protons et materiau comprenant de telles particules |
WO2005101552A2 (fr) * | 2004-04-15 | 2005-10-27 | Commissariat A L'energie Atomique | Procede de preparation de particules d'argile conductrices de protons et materiau composite comprenant de telles particules |
WO2005101552A3 (fr) * | 2004-04-15 | 2006-07-13 | Commissariat Energie Atomique | Procede de preparation de particules d'argile conductrices de protons et materiau composite comprenant de telles particules |
JP2007533090A (ja) * | 2004-04-15 | 2007-11-15 | コミツサリア タ レネルジー アトミーク | プロトン伝導性粘土粒子の製造方法及びその粒子を含む複合材料 |
US8562728B2 (en) | 2004-04-15 | 2013-10-22 | Commissariat A L'energie Atomique | Process for preparing proton-conducting clay particles and composite material comprising such particles |
WO2006097603A1 (fr) * | 2005-03-16 | 2006-09-21 | Institut National Polytechnique De Grenoble | Extrusion d'un polymere thermoplastique portant des groupements ioniques acides |
WO2006097602A1 (fr) * | 2005-03-16 | 2006-09-21 | Institut National Polytechnique De Grenoble | Preparation d'une membrane par extrusion d'un polymere thermoplastique portant des groupements ioniques alcalins. |
FR2883292A1 (fr) * | 2005-03-16 | 2006-09-22 | Inst Nat Polytech Grenoble | Extrusion de polymeres ioniques a groupements ioniques acides |
FR2883293A1 (fr) * | 2005-03-16 | 2006-09-22 | Inst Nat Polytech Grenoble | Extrusion de polymeres ioniques a groupements ioniques alcalins |
US7956095B2 (en) | 2005-03-16 | 2011-06-07 | Institut National Polytechnique De Grenoble | Extrusion of a thermoplastic polymer bearing acid ionic groupings |
US7973089B2 (en) | 2005-03-16 | 2011-07-05 | Institut National Polytechnique De Grenoble | Membrane preparation method comprising the extrusion of a thermoplastic polymer bearing alkaline groupings |
Also Published As
Publication number | Publication date |
---|---|
EP1392765A1 (de) | 2004-03-03 |
EP1884534A2 (de) | 2008-02-06 |
DE50210461D1 (de) | 2007-08-23 |
US20150376360A1 (en) | 2015-12-31 |
ES2292774T3 (es) | 2008-03-16 |
EP1392765B1 (de) | 2007-07-11 |
KR20090108672A (ko) | 2009-10-15 |
JP2007262419A (ja) | 2007-10-11 |
DE10292065D2 (de) | 2004-08-05 |
US20120088095A1 (en) | 2012-04-12 |
US8079480B2 (en) | 2011-12-20 |
AU2008229666A1 (en) | 2008-11-06 |
ZA200400186B (en) | 2005-05-25 |
KR20040008173A (ko) | 2004-01-28 |
AU2009201729A1 (en) | 2009-05-21 |
JP2004530020A (ja) | 2004-09-30 |
EP1884534A3 (de) | 2008-03-05 |
CN1527859A (zh) | 2004-09-08 |
AU2002342310B2 (en) | 2008-10-09 |
US9126147B2 (en) | 2015-09-08 |
JP4154244B2 (ja) | 2008-09-24 |
CA2446881A1 (en) | 2002-11-21 |
KR101005674B1 (ko) | 2011-01-05 |
US20040191522A1 (en) | 2004-09-30 |
AU2009200145A1 (en) | 2009-02-12 |
CA2446881C (en) | 2011-08-02 |
ATE366771T1 (de) | 2007-08-15 |
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