Process for producing a mainly inorganic foam, and thus produced mass or moulded part
OwnerGerhard Melcherinventor
Life of this patent
Estimating the term…
Abstract
A mainly inorganic foam is produced by foaming a filler-containing, preferably primary aqueous polyvalent metal phosphate solution having a defined viscosity, then by neutralising and cross-linking most of the secondary phosphoric acid protons by polyvalent cations. As foaming agents preferably carbonates are added that rapidly decompose in the acid metal phosphate solution. Cross-linking is ensured by hardening accelerators adapted to the foaming agent, for example polyvalent metal oxides. Accurately describable foaming characteristics are thus obtained which may be defined, as for a polyurethane foam, as starting time, rising time and setting time.
Claims20
A process for producing an inorganic solid foamed mass which comprises mixing components (A) and (B) to form a foam and allowing said foam to set to form said solid foamed mass, wherein component (A) comprises an aqueous acidic phosphate solution of mainly polyvalent cations and phosphoric acid wherein between 0.8 to 1.75 protons of the phosphoric acid molecule of said phosphate are neutralized by the cations, and which also contains one or more fillers in the form of granules, platelets or powders dispersed therein, and having a viscosity at room temperature in the range of 2,000 mPa.s to 60,000 mPa.s;
- and wherein component (B) comprises an oxide, hydroxide or polyvalent salt of a weak acid as hardener, and a foaming agent, a carbonate which develops a gas under hardening conditions within 5 seconds to 10 minutes and in amount to neutralize the secondary phosphate groups to form a cross-linked structure upon setting for a period of 20 seconds to 10 minutes said cross-linked structure is relatively elastic with respect to a cross-linked foamed structure obtained when the teritary phosphate groups are neutralized.
A premix composition for producing an inorganic solid foamed mass by mixing components (A) and(B) to form a foam and allowing said foam to set to form said solid foam mass, wherein said premix contains components (A) and (B) separate from each other prior to mixing and component (A) comprises an aqueous acidic phosphate solution of mainly polyvalent cations and phosphoric acid wherein between 0.8 to 1.75 protons of the phosphoric acid molecule of said phosphate are neutralized by the cations, and which also contains one or more fillers in the form of granules, platelets or powders dispersed therein, and having a viscosity at room temperature in the range of 2,000 mPa.s to 60,000 mPa.s;
- and wherein component (B) comprises an oxide, hydroxide or polyvalent salt of a weak acid as hardener, and as a foaming agent, a carbonate which develops a gas under hardening conditions within 5 seconds to 10 minutes of mixing and in amount to neutralize the secondary phosphate groups of component (A) to form a cross-linked structure upon setting for a period of 20 seconds to 10 minutes said cross-linked structure is relatively elastic with respect to a cross-linked foamed structure obtained when the tertiary phosphate groups are neutralized.
Dependencies are inferred from the claim text.