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CERAMIC MEMBRANES WITH IMPROVED ADHESION ON PLASMA-TREATED POLYMERIC SUPPORT MATERIAL, AND THEIR PREPARATION AND USE
CERAMIC MEMBRANES WITH IMPROVED ADHESION ON PLASMA-TREATED POLYMERIC SUPPORT MATERIAL, AND THEIR PREPARATION AND USE
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机译:等离子体处理的高分子支撑材料上附着力增强的陶瓷膜及其制备和使用
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摘要
Membrane (I) comprises a polymer fleece, whose inner and outer portion exhibits a ceramic coating (A) containing at least aluminum oxide, titanium dioxide, zirconium oxide, barium titanate and/or silicon dioxide; where: (A) contains at least two fraction of the above oxides; the first ceramic fraction is obtained from sol; the second fraction particle has an average particle size of 200 nm to 5 mu m; and the amount of the first and second fraction is 0.1-50 parts by weight and 5-99 parts by weight, respectively. Membrane (I) comprises a polymer fleece, whose inner and outer portion exhibits a ceramic coating (A) containing at least an aluminum oxide, titanium dioxide, zirconium oxide, barium titanate and/or silicon dioxide; where: (A) contains at least two fraction of the above oxides; the first ceramic fraction is obtained from sol; the second fraction particle has an average particle size of 200 nm to 5 mu m; the first fraction is in the form of a layer on the particles of the second fraction; the amount of the first and second fraction is 0.1-50 parts by weight and 5-99 parts by weight, respectively; (A) further comprises silicon or zirconium containing cross-linker; the silicon of the cross-linker is bonded over oxygen atoms of the oxides of (A); over the organic residue at the surface of the polymer fleece and over at least a carbon chain, a further silicon is bonded; and (A) is pinhole-free. An independent claim is included for the preparation of the membrane comprising applying (A) to the inner and outer portion of the polymer fleece; hardening (A) by uniform heating; subjecting the polymer fleece to plasma treatment, before applying (A); and treating the polymer fleece coated with (A) with UV-radiation; where: (A) before the application is based on a mixture of at least two different adhesive agent, respectively based on an alkylalkoxy silane compound of formula ((R) x-Si(OR) 4 - x) (I); the adhesive agents are selected such that both the adhesive agent exhibits alkyl residue with at least one reactive group as substituent; the polymer surface subjected to the plasma treatment forms a covalent bond in the presence of UV-radiation. R : an organic residue; and x : 1 or 2.
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