▎ 摘　　要

NOVELTY - The utility model claims a PPR insulating composite tube, comprising an outer layer, an insulating layer and a core layer, the outer layer and the core layer is provided with an insulating layer, the material of the outer layer is made of random copolymer polypropylene PPB insulating layer is doped hollow glass micro-powder PPB core layer of polypropylene random copolymer is irregular copolymer polypropylene PPR doped graphene oxide loading silver. the material of the insulating layer is doped hollow glass micro-powder of irregular copolymer polypropylene PPR, hollow structure in the glass micro hollow structure with excellent heat preservation performance, at the same time, using the hollow micro structure, reduce heat of the internal PPR tubing to external diffusion, a PPR pipe with excellent heat-insulating property.