▎ 摘　　要

NOVELTY - Preparing graphene flameretardant polyethylene tube involves putting the superfine calcium carbonate, drying and carrying out silanization modified treatment to prepare activated modified ultra-fine calcium carbonate powder, and putting the magnesium chloride with ethylene in vermiculite as the template to generate magnesium ion doped graphene. The high-density polyethylene, activated and modified ultra-fine calcium carbonate powder, magnesium ion doped graphene, pentaerythritol stearic acid amine and antioxidant are mixed uniformly and pelletilized to obtain polyethylene master batch. USE - Method for preparing graphene flame-retardant polyethylene tube (claimed). ADVANTAGE - The method enables to prepare graphene flame-retardant polyethylene tube which has effect of isolating air and co-express, and limiting oxygen index of 32-35. DETAILED DESCRIPTION - Preparing graphene flameretardant polyethylene tube involves putting the superfine calcium carbonate, drying and carrying out silanization modified treatment to prepare activated modified ultra-fine calcium carbonate powder, and putting the magnesium chloride with ethylene in vermiculite as the template to generate magnesium ion doped graphene. The high-density polyethylene, activated and modified ultra-fine calcium carbonate powder, magnesium ion doped graphene, pentaerythritol stearic acid amine and antioxidant are mixed uniformly and pelletilized to obtain polyethylene master batch. The polyethylene master batch is passed through pipe molding machine to extrude, and cooled, formed and cut to obtain the graphene flameretardant polyethylene tube.