PC/PMMA composite material and preparation method thereof

The invention discloses a PC/PMMA composite material and a preparation method thereof. In the PC/PMMA composite material, PP-g-St is used as a compatilizer for blending and extruding the PP-g-St, PCand PMMA to synthesize a PC/PMMA composite material. The composite material includes, in percentage by weight, 50%-90% of PC, 4%-20% of PMMA, 4%-30% of PP-g-St and 2% of an organic silicon light diffusion agent. The preparation method comprises the following steps: step 1, weighing materials in percentage by weight, and uniformly mixing to obtain a PC/PMMA mixed material; 2, feeding the mixed material into a double-screw extruder to be extruded and granulated, thereby producing the PC/PMMA composite material, wherein the double-screw extruder is divided into nine sections, and the temperaturesetting ranges of all the sections are as follows: in the first area, the temperature is 226-230 DEG C; in the second area, the temperature is 236-240 DEG C; in the third area, the temperature is 246-250 DEG C; in the fourth ar