Preparation method of water-based aluminum oxide automobile-grade pearlescent material

The invention discloses a preparation method of a water-based aluminum oxide automobile-grade pearlescent material, which comprises the following steps: S1, adding aluminum hydroxide powder and polyethylene glycol into a grinding device, grinding to obtain a mixture A, and drying and calcining the mixture A to obtain transition aluminum oxide; s2, adding transition aluminum oxide, polyethylene glycol and aluminum fluoride into a grinding device, grinding to obtain a mixture B, and drying and calcining the mixture B to obtain flaky aluminum oxide powder; s3, the obtained flaky aluminum oxide powder is subjected to hydrolysis coating through titanium tetrachloride and then calcined, and the pearlescent material is obtained. Flaky aluminum oxide is prepared through a high-temperature solid-phase method and then coated with TiO2 to obtain the water-based aluminum oxide automobile-grade pearlescent material, aluminum hydroxide and transition aluminum oxide are fully ground through a grinding device in the preparat