A method for forming a surface structure on a synthetic mica is provided to remove shining of the raw material in a product by reducing glossiness of a raw material itself, and prevent darkness or braking of a makeup due to absorption of sebum oil by increasing oil absorptivity of the raw material. A method for forming a surface structure on a synthetic mica comprises the steps of: (1) treating a surface of a synthetic mica with 2 to 6 wt.% of an acid； (2) cooling the acid-treated synthetic mica to a temperature of 30 to 40 deg.C for 30 minutes to 2 hours to form a structure on the surface of the synthetic mica； and (3) performing coating of the structure-formed surface of the synthetic mica by a wet coating, dry coating or vapor phase coating process. The step(1) is conducted by applying an energy range of 500 to 1000 J/ml to the synthetic mica when treating the surface of the synthetic mica with the acid. The step(1) is performing using at least one acid selected from the group consisting of hydrofluoric acid, nitric acid, acetic acid, hydrochloric acid, and phosphoric acid. The step(3) is performed by using at least one coating material selected from the group consisting of methicone, triethoxycaprylylsilane, acrylate/tridecyl acrylate/triethoxysilypropylmethacrylate/dimethiconemethacrylate copolymer, and triethoxysilylethyl polydimethyl siloxyethylhexyl dimethicone.본 발명은 합성 마이카에 표면 구조체를 형성하는 방법에 관한 것으로서, 보다 상세하게는 용매의 농도, 온도 및 반응시간 등을 조절함으로써 원료 자체의 광택을 줄여 제품 내에서의 번들거림을 해소하고, 피지 흡유에 의한 화장의 칙칙함 및 붕괴를 방지하기 위하여 흡유도를 증가시키도록 합성 마이카에 표면 구조체를 형성하는 방법에 관한 것이다.
