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AssigneeLeibniz-Institut Fuer Polymerforschung Dresden E.V.
InventorDieter LEHMANN
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The invention pertains to the fields of chemistry and construction and relates to surface-modified glass fiber for reinforcing concrete, such as those which can be used in textile-reinforced concrete (textile concrete), for example. The object of the present invention is to provide surface-modified glass fibers for reinforcing concrete, which glass fibers are at least substantially protected against an alkaline attack caused by the calcium hydroxides released during the cement reaction and/or dissolution and leaching processes generated thereby. The object is attained with surface-modified glass fibers for reinforcing concrete which are at least partially covered at least with a hydrolysis-stable and alkali-resistant cationic polyelectrolyte and/or hydrolysis-stable and alkali-resistant cationic polyelectrolyte mixture and/or with a hydrolysis-stable and alkali-resistant polyelectrolyte complex and coupled to the glass fiber surface via a (polyelectrolyte) complex formation process by means of ionic bonding, with the hydrolysis-stable and alkali-resistant polyelectrolyte complex A thereby being formed, wherein at least one additional (co)polymer at least partially covers the polyelectrolyte complex A and is coupled with the polyelectrolyte A via ionic and/or covalent bonds.
Surface-modified glass fibers for reinforcing concrete which are at least partially covered at least with a hydrolysis-stable and alkali-resistant cationic polyelectrolyte and/or hydrolysis-stable and alkali-resistant cationic polyelectrolyte mixture and/or with a hydrolysis-stable and alkali-resistant polyelectrolyte complex and coupled to the glass fiber surface via a (polyelectrolyte) complex formation process by means of ionic bonding, with the hydrolysis-stable and alkali-resistant polyelectrolyte complex A thereby being formed, wherein at least one additional (co)polymer at least partially covers the polyelectrolyte complex A and is coupled with the polyelectrolyte A via ionic and/or covalent bonds.
Reinforcing materials for textile concrete with surface-modified glass fibers in which a hydrolysis-stable and alkali-resistant polyelectrolyte complex A is present in an at least partially covering manner on glass fiber surfaces without sizing material and silane, which polyelectrolyte complex comprises functional groups and/or olefinically unsaturated double bonds, and which are present such that they are coupled via chemically covalent bonds with additional (co)polymers after a reaction with functional groups and/or olefinically unsaturated double bonds.
A method for producing surface-modified glass fibers, in which method a hydrolysis-stable and alkali-resistant cationic polyelectrolyte and/or a hydrolysis-stable alkali-resistant cationic polyelectrolyte mixture and/or a hydrolysis-stable and alkali-resistant polyelectrolyte complex with an excess of cationic charges is applied from an aqueous solution at a concentration of maximally 5 wt % to the glass fiber surfaces in an at least partially covering manner during or after the production of glass fibers, wherein hydrolysis-stable and alkali-resistant cationic polyelectrolytes and/or hydrolysis-stable and alkali-resistant cationic polyelectrolyte mixtures with a molecular weight under 50,000 dalton and/or a hydrolysis-stable and alkali-resistant polyelectrolyte complex with an excess of cationic charges are used, and at least one additional (co)polymer is subsequently applied in an at least partially covering manner to the hydrolysis-stable and alkali-resistant polyelectrolyte complex A created on the glass surface.
Dependencies are inferred from the claim text.