Advanced multi-functional asbestos free thermal insulating material and the process for preparation thereof

Patent metadata

Field	Value
Publication number	US-11414349-B2
Application number	US-202016996572-A
Country	US
Kind code	B2
Filing date	Aug 18, 2020
Priority date	Aug 20, 2019
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

The present invention relates to advanced multi-functional asbestos-free thermal insulating materials utilizing appropriate matrixes comprising nano thermal insulating precursor powder predominantly comprising calcium silicate and calcium magnesium silicate prepared from marble waste powder, rice husk and calcium hexametaphosphate; crushed silica fiberglass and a supporting matrix.

First claim

The invention claimed is:

1. A multi-functional asbestos-free thermal insulating material comprising:
i. nano thermal insulating precursor powder comprising calcium silicate and calcium magnesium silicate prepared from 45.45-49.50% of marble waste powder, 45.45-49.50% of Rice husk and 1 to 9.1% of calcium hexametaphosphate;
ii. crushed silica fiberglass; and
iii. a supporting matrix comprising an inorganic geopolymeric matrix;
wherein the ratio of nano thermal insulating precursor powder, crushed silica fiberglass and the supporting matrix is in the range of 10:3:2.9 to 60:8:75.

2. The multi-functional asbestos-free thermal insulating material as claimed in claim 1 , wherein the geopolymeric matrix comprises of 68.62-68.96% fly ash, 8.82-10.34% potassium hydroxide, 3.45-4.90% potassium silicate and 17.25-17.64% of water.

3. A process for preparing a multi-functional asbestos free thermal insulating tiles, the process comprising:
a. dry grinding of 45.45-49.50% of marble waste powder; 45.45-49.50% of rice husk and 1 to 9.1% of calcium hexametaphosphate in a ball mill or planetary mill for a period of 8 to 10 hours to obtain a grinded powder;
b. mixing the grinded powder to an aqueous solution of 50-80% potassium hydroxide to obtain a reaction mixture;
c. irradiating the reaction mixture obtained in step (b) in a microwave with a power of 200-350 watts for a duration of 10-15 minutes to obtain a precipitate;
d. filtering the precipitate obtained in step (c) and drying it at 1000 C-1100 C to obtain a solid powder of homogenized nano thermal insulating precursor;
e. mixing 62.9-76.75% of the homogenized nano thermal insulating precursor with 13.05-18.25% geopolymeric matrix comprising 68.62-68.96% fly ash, 8.82-10.34% potassium hydroxide and 3.45-4.90% potassium silicate and 17.25-17.64% of water to obtain a mixture;
f. mixing 10.20-18.85% crushed silica fiberglass to the mixture obtained in step (e) to form a material; and
g. compacting the material in the form of tiles of 10 cm×10 cm×8 mm to 10 cm×10 cm×10 mm at a compaction pressure of 100-200 kg/cm 2 and heating the tiles in an electric furnace at a temperature range of 1100−1200° C. for a period of 2 to 3 hours.

Assignees

• Council Scient Ind Res

Inventors

• Verma Sarika
• Sanghi Sunil Kumar
• Khan Mohammed Akram
• Rathore Sanjai Kumar Singh
• Srivastava Avanish Kumar

Classifications

• C04B28/001

  containing unburned clay (polymer binder - clay mixtures used in well cementing C09K8/44) · CPC title

• C04B14/043

  Alkaline-earth metal silicates, e.g. wollastonite · CPC title

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B26/32 Primary

  containing silicon · CPC title