国家/地区 中国（3）
IPC部 B（3）
IPC大类 C08（3）
IPC小类 C08G（3）
IPC C08G101/00（3）
发明人
公开年 2021（3）
申请年 2021（2） 
专利权人

Preparing polyurethane prefabricated direct-buried thermal insulation composite pipe, comprises nesting working pipe and fixing in outer protective pipe, forming cavity, and adding polyurethane stock solution for free pressure foaming.

SHI Q, LIANG H

Graphene polyurethane composite sponge material with good air permeability comprises polyol, polyisocyanate, graphene-zeolite composite, porous ceramic particles, opener, silane coupling agent, and foaming agent.

WANG B

High performance polyurethane flame retardant foam comprises a foam base layer, a bulked fiber layer and a silencing foam layer.

WANG X, YOU Z