▎ 摘　　要

NOVELTY - Preparation of foaming material with gradient hole structure comprises using polymer as substrate, mechanically blending foaming auxiliary agent, lubricant, nucleating agent, crosslinking agent, and foaming agent, and banburying and refining; measuring density of the foaming master slice and calculating the quality of the master slice; microwave heating and foaming; and immediately releasing pressure after the mold is heated and opening the mold in 3 seconds. The raw material of the foam hole foaming mother sheet comprises polymer, foaming auxiliary agent, lubricant, nucleating agent, crosslinking agent, and foaming agent. The small foam hole foaming mother sheet comprises polymer, foaming auxiliary agent, lubricant, nucleating agent, crosslinking agent, and foaming agent. USE - The method is used for preparing foaming material with gradient hole structure. ADVANTAGE - The foaming agent absorbs and releases heat differently during the foaming process, can change the melt strength and viscosity of the corresponding material to make the resistance applied to the bubble growth process different, has high production efficiency, and is suitable for industrial large-scale production. DETAILED DESCRIPTION - Preparation of foaming material with gradient hole structure comprises taking polymer as substrate mechanically blending foaming auxiliary agent with different content, lubricant, nucleating agent, crosslinking agent, and foaming agent, and banburying and refining to prepare foam hole foaming mother sheet and small foam hole foaming mother sheet; measuring the density of the foaming master slice and calculating the quality of the master slice, where mass ratio of the foaming master slice of large bubble hole to small foam hole is 1:1; microwave heating and foaming at 165-175 degrees C for 400-700 seconds; and immediately releasing pressure after the mold is heated and opening the mold in 3 seconds. The raw material of the foam hole foaming mother sheet comprises 1000 pts. wt. polymer, 10-12 pts. wt. foaming auxiliary agent, 10-12 pts. wt. lubricant, 10-200 pts. wt. nucleating agent, 8-10 pts. wt. crosslinking agent, and 30-42 pts. wt. foaming agent. The small foam hole foaming mother sheet comprises 1000 pts. wt. polymer, 10-12 pts. wt. foaming auxiliary agent, 10-12 pts. wt. lubricant, 10-200 pts. wt. nucleating agent, 8-10 pts. wt. crosslinking agent, and 30-55 pts. wt. foaming agent.