US 12,215,211 B2
Multi-stage foam sound-absorbing black body material and preparation method thereof
Zhen Xu, Zhejiang (CN); Xiaoting Liu, Zhejiang (CN); Kai Pang, Zhejiang (CN); and Chao Gao, Zhejiang (CN)
Assigned to ZHEJIANG UNIVERSITY, Hangzhou (CN)
Filed by ZHEJIANG UNIVERSITY, Zhejiang (CN)
Filed on Feb. 28, 2023, as Appl. No. 18/115,753.
Application 18/115,753 is a continuation of application No. PCT/CN2022/086668, filed on Apr. 13, 2022.
Claims priority of application No. 202110398409.3 (CN), filed on Apr. 14, 2021.
Prior Publication US 2023/0203267 A1, Jun. 29, 2023
Int. Cl. C08J 9/40 (2006.01); C08J 9/35 (2006.01)
CPC C08J 9/40 (2013.01) [C08J 9/35 (2013.01); C08J 2205/044 (2013.01); C08J 2375/04 (2013.01); C08J 2379/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A preparation method for a multi-stage foam sound-absorbing black body material, comprising the steps of:
immersing a polymer foam into a graphene oxide dispersion, with graphene oxide of the graphene oxide dispersion filling into an interior of the polymer foam,
drying the polymer foam filled with graphene oxide to obtain a dried foam;
adding the dried foam in a foaming agent solution for foaming, and
drying after foaming to obtain the multi-stage foam sound-absorbing black body material;
wherein the multi-stage foam sound-absorbing black body material comprises a polymer foam skeleton having a pore size of 10 μm or more and a continuous graphene resonant cavity attached thereto, wherein a cavity wall of the graphene resonant cavity is graphene having a thickness of 100 nm or less; and wherein the polymer foam skeleton forms a primary foam structure, and the graphene resonant cavity forms a secondary foam structure.