Because of its use, coatings often need to add some fillers, and the particle size, particle size distribution, volume concentration, and dispersibility in the coating system will greatly affect the gloss of the coating film [4]. For example, as long as the filler is added, it will not affect the gloss of the coating film, because if the particle size of the filler is small, it will be deposited inside the coating film, its degree of bareness is small, its impact on roughness is small, and then its glossiness The effect is small; on the contrary, if the particle size is suitable and its degree of exposure is large, it will greatly affect the gloss of the coating. Studies have shown that when the average particle diameter is less than 0.3 μm, the surface roughness of the coating film is basically not affected, and when the average particle diameter is 3 to 5 μm, the surface roughness of the coating film is significantly increased. Besides, the volume concentration is large, and the effective exposed area is increased, which is beneficial to increase the surface roughness of the film and thus reduce the gloss. The better the dispersibility, the smaller the particle size of the filler in the coating system will increase the gloss of the film surface.