US 9,120,701 B2 · Composition for advanced hybrid geopolymeric functional materials and a process for the preparation thereof

Abstract

The present invention provides a composition for advanced hybrid geopolymeric functional materials possessing very broad application spectrum ranging from cementitious materials to advanced functional materials having “Inorganic-Organic Hybrid” matrix in contrast to the limited application of conventional geopolymeric materials having “Inorganic matrix” only. The invention further relates to a process for the preparation of these materials. The process obviates the need of external addition of sodium silicate which is one of the costliest and main raw materials in conventional geopolymerisation processes. Interestingly, in the present invention the sodium silicate has been synthesized in situ by designing of conditions for synergistic and simultaneous mechano-chemical reactions among the selected raw materials viz. inorganic and organic wastes under alkaline environment. This results in the formation of “Hybrid inorganic-organic frame work” of sodium silicate, which facilitates uniform dispersion of reacting species, thus resulting in the formation of homogeneous geopolymeric matrix with improved characteristics.

Claims11

Dependent claims

A process for making a hybrid geopolymeric functional material comprising the steps of:

crushing and grinding fly ash containing Si and Al, and crushing and grinding rice husks;
reacting at a temperature of from 24° C. to 200° C.
a) said ground inorganic fly ash containing Si and Al;
b) aqueous sodium hydroxide;
and
c) said ground rice husk;
wherein the ratio of a):b):c) is 0.5 to 1.0:
0.1 to 0.4:
0.1 to 0.2;
said reaction producing insitu sodium silicate, and converting said rice husk organic compounds to lignin, cellulose, or hemicellulose species, or any combination thereof;
reacting said sodium silicate with said inorganic compounds and said rice husk species and forming chemical linkages of said sodium silicate with said fly ash and said rice husk species and producing a hybrid inorganic-organic geopolymer functional material;
and
wherein said reactants are free of rice husk ash.

10 more elements

Dependencies are inferred from the claim text.

Composition for advanced hybrid geopolymeric functional materials and a process for the preparation thereof

Life of this patent

Composition for advanced hybrid geopolymeric functional materials and a process for the preparation thereof

Life of this patent

Abstract

Claims11