US 5,312,486 AGranted

Water-containing, hardenable foam compositions with inorganic components and process for their preparation

OwnerFrank Meyer, Hans Mehesch +4inventors

InventorsFrank Meyer, Hans Mehesch, Wolfgang Cornely, Martin Fischer, Birgit Riecks, Karlheinz Neuschaffer

Life of this patent

Estimating the term…

Loading patent…

Abstract

Hardenable foam compositions comprising oxygen-releasing foaming agents, a hardener consisting of an alkali silicate solution, a fine particle solid material which reacts with said hardener, namely an oxide mixture consisting of SiO.sub.2 and Al.sub.2 O.sub.3 extracted from a filter dust, an electrofilter ash from high-temperature power plants, and calcinated bauxite or amorphous silica, to which reaction accelerators are added, are improved, firmer, faster hardening foams. Reducing agents, in particular sulphur compounds with a reducing action are preferred. Oxidizing agents or fine particle substances such as soot or color pigments are effective.

Claims5

Dependent claims

An improved pourable, water-containing, hardenable foam composition comprising the conventional ingredients

(a) as a hardener, dissolved SiO.sub.2 in the form of an aqueous solution of alkali metal silicates,
(b) per part by weight of dissolved SiO.sub.2, 0.7 to 2.5 parts by weight of K.sub.2 O or 0.55 to 1.5 parts by weight of NA.sub.2 O,
(c) per part of weight of dissolved SiO.sub.2, 1.3 to 10 parts by weight of at least one solid selected from the group consisting of oxide mixtures containing amorphous SiO.sub.2 and aluminum oxide, vitreous amorphous electrofilter ash, calcined bauxite, and undissolved SiO.sub.2 in the form of amorphous, powdery, dehydrated or water-containing silicic acid,
(d) fillers,
(e) water, and
(f) an oxygen-releasing foaming agent, wherein the improvement resides in that the composition further comprises 0.1 to 9% by weight, based on the total weight of the foam composition, of at least one reaction accelerator selected from the group consisting of
(i) reducing agents selected from the group consisting of alkali metal pyrosulfites, alkali metal dithionites, alkali metal salts of hydroxy-methanesulphinic acid, alkali metal phosphites and alkali metal borohydrides, and
(ii) oxidizing agents selected from the group consisting of alkali metal chromates, alkali metal bichromates, cu(II) salts and Fe(III) salts.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/859,644Filed 23 Mar 1992 · continuation
Priority: DE 374421024 Dec 1987
Granted: 17 May 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

C04B 28/26
Containing alkyl, ammonium or metal silicates; containing silica sols: silicates of the alkali metals
C04B 22/087
Acids or salts thereof: containing chromium in the anion, e.g. chromates
C04B 22/14
Acids or salts thereof: containing sulfur in the anion, e.g. sulfides
C04B 24/16
Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers: sulfur-containing compounds