▎ 摘　　要

NOVELTY - Bead method type 2 insulation beads comprises foamed particles containing a carbon-based material and having an average radius of t1 (mm); an adhesive layer having a thickness of t2 (mm) formed by coating a first adhesive foamed on the outer surface of the expanded particles; and a flame-retardant layer coated with a thickness t3 (mm) thicker than t2 (mm), and comprising a second adhesive and a flame retardant foamed on the adhesive layer, where the ratio of t1 and t2+t3 is 1:0.0001-1:0.2, and the average diameter before molding of the bead method type 2 insulating beads is s1 (mm), and the average diameter of the bead method type 2 insulating beads after drying is s2 (mm), and two bead methods with s2 less than or equal to s1+s1x 0.005. USE - The insulation beads are useful for flame-retardant insulation board (claimed). ADVANTAGE - The bead method type 2 insulation beads has improved insulation performance, is economical, and environmentally-friendly. The flame retardant insulation board has increased flame retardancy, and can prevent the flame-retardant layer from peeling off by improving the binding strength between the expanded particles and the flame-retardant layer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a flame-retardant insulation board containing carbon-based material in bead method type 2 insulation beads, comprising a board in which two types of insulation beads are fused to each other by molding and drying the bead method after coating the flame-retardant layer on the expanded particles and a flame retardant layer having a thickness of 0.05-1 mm is coated on the board.