Method for producing nanosilica plates

A method for producing random form of nanosilicate plates, comprising the steps of:

• (a) preparing amine-terminating epoxy oligomers (AEO) from polyoxyalkylene diamine and diglycidyl ether of bisphenol-A at a molar ratio of (m+1):m, where m=1 to 5, and at a reaction temperature between 25° C. and 150° C., to obtain a polymeric amine exfoliating agent, having a general formula:
• wherein R is an organic group selected from the group consisting of polyoxybutylene groups, polyoxypropylene groups, poly(oxyethylene/oxypropylene) groups, and polyoxyethylene groups;
• (b) adding inorganic acid including hydrochloric acid to said AEO to form an acidified AEO;
• (c) mixing said acidified AEO with a swelled inorganic layered silicate clay so as to exfoliate said silicate clay directly through cationic exchange to form an exfoliated silicate clay;
• and
• (d) mixing an aqueous solution containing a hydroxide or a chloride of alkali metal or alkaline-earth metal, ethanol, water and an organic solvent to said exfoliated silicate clay obtained in step (c) to form a mixture, and then, after mixing, keeping the mixture static to form an upper organic phase and a lower water phase containing nanosilicate plates.