▎ 摘　　要

NOVELTY - Flame-retardant and environmentally friendly plastic includes a PC plastic base layer (1), a first cubic boron nitride flame-retardant layer (2) arranged on upper surface of the PC plastic base layer, and a second cubic boron nitride flame-retardant layer (3) arranged on lower surface of the PC plastic base layer. The outer surface of the first cubic boron nitride flame-retardant layer is provided with a first phase-change material layer (4) and a second phase-change material layer (5), and the first phase-change material layer is along the first cubic boron nitride flame-retardant layer. The surface is set and formed the first round structure, The second phase change material layer is arranged along the surface of the first cubic boron nitride flame-retardant layer and forms a second round structure embedded in the first round structure. USE - Flame-retardant and environmentally friendly plastic. ADVANTAGE - The flame-retardant and environmentally friendly plastic has high heat dissipation and flame retardant properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a flame-retardant environmentally friendly plastic, which involves: (A) selecting cubic boron nitride, ammonium thiocyanate, neopentyl glycol, potassium fluoride, trimethylolpropane as targets, and PC plastic as the matrix; (B) placing the substrate and target in the vacuum chamber of the magnetron sputtering equipment, and evacuating the vacuum chamber to a background vacuum of 2x 10(-)3pa; (C) bringing in argon with a purity of 99.999% as the working gas, the working pressure of sputtering is 0.2-0.3Pa, and applying negative bias voltage of 50-200V to the substrate; (D) turning on the sputtering cubic boron nitride target material on a surface of the substrate for 10-30 seconds and then stop to obtain the first cubic boron nitride flame-retardant layer; (E) sputtering of the ammonium thiocyanate target material is stopped for 6-12 seconds, and the ammonium thiocyanate is formed to form a first round structure on the surface of the first cubic boron nitride flame-retardant layer; (F) sputtering neopentyl glycol target for 6 to 12 seconds and then stopped, and forming neopentyl glycol on the surface of the first cubic boron nitride flame-retardant layer to form a second round structure that fits with the first round structure; (G) turning on the sputtering cubic boron nitride target material on the other surface of the substrate for 10-30 seconds and then stopping to prepare the second cubic boron nitride flame-retardant layer; (H) sputtering of the potassium fluoride target material is stopped for 6-12 seconds, and the potassium fluoride hydride is formed to form a third round structure on the surface of the second cubic boron nitride flame-retardant layer; (I) sputtering the trimethylolpropane target for 6-12 seconds and then stop; and (J) making trimethylolpropane on the surface of the second cubic boron nitride flame-retardant layer to form a fourth round structure that fits with the third round structure. DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of flame-retardant and environmentally friendly plastic. PC plastic base layer (1) First cubic boron nitride flame-retardant layer (2) Second cubic boron nitride flame-retardant layer (3) First phase-change material layer (4) Second phase-change material layer (5)