Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Anorganische Hohlfasern

Inorganic hollow fibers, useful in separating processes and gas exchange, are prepared by processing a spinning composition prepared by hydrolytic polycondensation.
 
: Ballweg, T.; Wolter, H.; Storch, W.

:
Frontpage ()

DE 2000-10012308 A: 20000314
DE 2000-10012308 A: 20000314
EP 2001-929233 A: 20010307
WO 2001-DE900 A: 20010307
DE 10012308 A1: 20010927
EP 1264018 A1: 20021211
D01F0006
D01F0009
German
Patent, Electronic Publication
Fraunhofer ISC ()

Abstract
Die Erfindung betrifft anorganische Hohlfasern, eine Spinnmasse und ein Verfahren zu deren Herstellung sowie deren Verwendung fuer Fluessigkeitstransporte, fuer den Gasaustausch und in Trennverfahren. Die erfindungsgemaessen Hohlfasern sind dadurch erhaeltlich, dass man eine Spinnmasse nach ueblichen Methoden zu einer Hohlfaser verarbeitet, diese thermisch, strahlungs- oder chemisch induziert haertet und durch Pyrolyse die organischen Bestandteile entfernt. Die Spinnmasse wird erhalten durch hydrolytische Polykondensation von Verbindungen der Formel SiX<a<R'<b<R<(4-a-b)< und M<1<R<o<<3< oder M<2<X<y<R<z< und gegebenenfalls von Verbindungen der Formel X<a<SiR<4-a< oder von cokondensierbaren Verbindungen der Elemente Li, Na, Mg, Ca, Sr, Ba, Zn, Sn oder Pb. Die hydrolytische Polykondensation wird durch Zugabe von Wasser oder Feuchtigkeit durchgefuehrt. Gegebenenfalls werden der Spinnmasse copolymerisierbare oder (poly)addierbare Monomere oder Oligomere, Haertungskatalysatoren, Poren erzeugende Additive oder im Reaktionsmedium loesliche Verbindungen der Elemente Li, Na, Mg, Ca, Sr, Ba, Zn, Sn und Pb zugesetzt.

 

WO 200168961 A UPAB: 20020208 NOVELTY - Inorganic hollow fibers, prepared by processing a spinning composition, prepared by hydrolytic polycondensation optionally in the presence of a solvent and/or a condensation catalyst and optionally by addition of copolymerizable and/or addition polymerizable monomer or oligomer, a catalyst, a pore forming additive and/or soluble compounds of Li, Na, Mg, Ca, Sr, Ba, Zn, Sn or Pb. DETAILED DESCRIPTION - Inorganic hollow fibers (I) are prepared by processing a spinning composition (II) by conventional methods. The hollow fibers are optionally dried and the optionally dried fibers are hardened by polymerization and/or polyaddition by thermal, radiation and/or chemically induced means and the hardened hollow fiber is pyrolyzed to remove the organic components. The spinning composition (II) is prepared by (A) hydrolytic polycondensation of at least one compound of formula (1) and/or derived pre-condensates and at least one, optionally complexed compound of formula (2) and/or (3) or their corresponding pre-condensates and optionally at least one compound of formula (4) and/or corresponding pre-condensates and/or compounds of Li, Na, Mg, Ca, Sr, Ba, Zn, Sn or Pb. The hydrolytic polycondensation is carried out by addition of water or moisture, optionally in the presence of a solvent and/or a condensation catalyst, the molar ratio of the compound of formula (1) to the sum of compounds of formula (2) and (3) is 99:1-1:99. Optionally the spinning composition is prepared by (B) addition of at least one copolymerizable and/or (poly)addition monomers, and/or oligomers, and/or catalyst(s), and/or pore forming additive(s), and/or compounds of Li, Na, Mg, Ca, Sr, Ba, Zn, Sn or Pb which are soluble in the reaction medium. SiXaR'bR(4-a-b) (1) M1R03 (2) M2XyRz (3) XaSiR4-a (4) R = 1-20C alkyl, alkenyl, aryl alkylaryl or arylalkyl, optionally containing oxygen and/or sulfur atoms and/or ester, carbonyl, carboxyl, amide and/or amine groups, R'=1-50C organic group having at least one polymerizable or polyadditive group; X = H, halogen, hydroxy, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR2; R = H, alkyl or aryl; a, b = 1-3; a+b = 2-4; M1 = aluminum or boron; M2 = titanium or zirconium; R0 = halogen, hydroxy, alkoxy or acyloxy; y = 1-4; z = 0-3; and y+z = 4. An INDEPENDENT CLAIM is included for the spinning composition (II) USE - The hollow fibers (I) are useful in separating processes and gas exchange (claimed). ADVANTAGE - The fibers (I) have an improved mechanical stability and high selectivity.

: http://publica.fraunhofer.de/documents/N-44122.html