Sheet silicate lamellae with a high aspect ratio
AssigneeBYK-Chemie GmbH
InventorsHussein Kalo, Josef Breu, Matthias Stoeter, Matthias Daab
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Abstract
The present invention relates to sheet silicate lamellae of a 2:1 sheet silicate with a high aspect ratio, to a method for producing these sheet silicate lamellae and to an aqueous dispersion which comprises the sheet silicate lamellae. The present invention further relates to the use of the sheet silicate lamellae of the invention for producing a composite material, and also to a corresponding composite material comprising or obtainable using the sheet silicate lamellae, more particularly for use as a diffusion barrier or as a flame retardant.
Claims10
Sheet silicate lamellae obtained by a method of delaminating a 2:1 sheet silicate, having ordered interstratification, in water, the method comprising:
- preparing the 2:1 sheet silicate having an ordered interstratification by treating a 2:1 sheet silicate (A) with a solvent mixture comprising water, an alkylammonium salt, and a monoalcohol having 1 to 4 carbon atoms,
- wherein the 2:1 sheet silicate (A) has a Lagaly layer charge of 0.56 per formula unit to 0.90 per formula unit and the interlayers at least alternately have sodium cations,
- separating the 2:1 sheet silicate having an ordered interstratification from the solvent mixture,
- delaminating the 2:1 sheet silicate having an ordered interstratification by introducing the separated 2:1 sheet silicate having an ordered interstratification into water to produce an aqueous dispersion comprising sheet silicate lamellae, and
- separating the sheet silicate lamellae from the aqueous dispersion,
- wherein
- the sheet silicate lamellae have an average aspect ratio of at least 10,000.
Dependencies are inferred from the claim text.