Temperature-resistant potting material for hollow fiber membranes
AssigneeFresenius Medical Care Deutschland GmbH
InventorsMatthias FAUST, Manuel WILHELM
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Abstract
The invention relates to a method for potting hollow fiber membranes in potting compounds of increased temperature resistance, wherein an isocyanate component with inorganic particles and a polyol component are processed into a potting compound and the hollow fiber membranes are tightly encased by the potting compound in at least one potting zone by the hardening of said potting compound.
Claims19
A method for potting hollow fiber membranes comprising the steps:
- (i) providing a plurality of hollow fiber membranes,
- (ii) reacting an isocyanate component containing at least one diisocyanate compound with inorganic particles containing hydroxy groups to form a compound comprising an isocyanate group-containing adduct,
- wherein
- the isocyanate groups of the isocyanate component are present in stoichiometric excess relative to the hydroxy groups of the hydroxy group-containing inorganic particles, and
- wherein
- at least a portion of the hydroxy groups of the hydroxy group-containing inorganic particles reacts with at least a portion of the isocyanate groups of the isocyanate component into urethane bonds,
- (iii) mixing the obtained compound containing the isocyanate group-containing adduct with a polyol component containing at least one diol compound into a potting compound,
- (iv) potting the hollow fiber membranes with the potting compound in at least one potting zone,
- (v) hardening the potting compound in the potting zone into a polyurethane resin.
A hollow fiber membrane filter comprising a plurality of hollow fiber membranes potted in a polyurethane resin in at least one potting zone characterized in that the polyurethane resin comprises at least 0.01% to 2.3% by weight of inorganic particles bonded in the polyurethane resin via urethane bonds relative to the total weight of the polyurethane resin.
An isocyanate group-containing adduct, obtained by reacting at least one isocyanate component containing at least one diisocyanate compound and hydroxy group-containing inorganic particles, wherein at least one portion of the hydroxy groups of the hydroxy group-containing inorganic particles are reacted with at least one portion of the isocyanate groups of the isocyanate component into a urethane bond, and wherein free isocyanate groups are present in the obtained adduct.
Dependencies are inferred from the claim text.