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

A process for preparing a multi-functional asbestos free thermal insulating material comprising the steps of:

• a. dry grinding of 49.50-45.45% of marble waste powder;
• 49.50-45.45% of Rice husk and 1 to 9.1% of calcium hexametaphosphate in a ball mill or planetary mill for the period of 8 to 10 hours to obtain a grinded powder;
• b. mixing the grinded powder to aqueous solution of 50-80% potassium hydroxide to obtain a reaction mixture;
• c. irradiating the reaction mixture obtained in step (b) in microwave 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 100° C.-110° C. to obtain solid powder of homogenized nano thermal insulating precursor;
• and
• e. treating the homogenized nano thermal insulating precursor of step (d) with supporting matrix selected from the group consisting of inorganic geopolymeric matrix, organo-chemical matrix, putty matrix, cement matrix and phosphatic matrix to obtain a multi-functional asbestos-free thermal insulating material.