国家/地区 中国（2）
IPC部 C（2）
IPC大类 C09（2）
IPC小类 C09D（2）
IPC C09D005/08（2）
发明人
公开年 2023（2）
申请年 2022（2） 
专利权人

Heat exchanger pipeline for use in petrochemical industry, has pipeline main body whose outer surface is covered with two layers of silicon carbon nano modified graphene-corrosion coating that are arranged in laminated manner.

HE W, YANG R, GUO H, GUO J, ZHOU H, LU X, DONG Z, LI D, FAN G, SUN Y

Preparing internal spiral polyvinyl chloride drainage pipe, comprises e.g. bending and spiraling steel wire, extruding, injecting into brushing mechanism, carrying out spiral groove processing, forming inner spiral groove, spraying, extruding, painting and performing preliminary drying.

LIU Z