Patent ID: 7232481

Claim:
A method to produce an anti-swelling mica, the method comprising steps of: a mixing step: mixing powdery mica with an alkaline compound to form a mixture having a weight ratio of the powdery mica to the alkaline compound being 1:1˜1:20; a heating step: heating the mixture at a temperature between 150° C.˜230° C. for lasting 30 minutes to make metal ions out of the alkaline compound to diffuse into the mica homogeneously; a cooling step: using water to reduce temperature of the mixture so as to form an alkaline solution; a first separating step: separating the powdery mica from the alkaline solution to obtain a solid mica; a neutralizing step: neutralizing residual alkaline compound adhering to the solid mica by an acid solution that is diluted by cold water before and then the mica anti-swells after adjusting pH of the solid mica to less than 7.0; and a second separating step: diluting the acid solution again by water and separating the solid mica from diluted acid to obtain a production—anti-swelling mica.