▎ 摘　　要

NOVELTY - Preparing graphene-modified flame-retardant polyvinyl chloride threading pipe involves mixing an aqueous solution of barium hydroxide and a water dispersion of graphene, and then adding an excess amount under stirring conditions. The zinc sulfate aqueous solution is further stirred for 60-200 minutes, solid-liquid separation, and heated at 130 degrees C for 30 min to obtain a graphene composite flame retardant synergist. The concentration of the aqueous cesium hydroxide solution is 5 to 10 wt.%, and the graphene aqueous dispersion The weight percentage of graphene is 7-15 wt.%. The concentration of the zinc sulfate aqueous solution is 5-10 wt.%. The volume ratio of the aqueous cesium hydroxide solution and the aqueous graphene dispersion is 1-3:1. The coupling silane agent is added to water, stirred at 60-90 degrees C under constant temperature, and then added magnesium hydroxide. USE - Method for preparing graphene-modified flame-retardant polyvinyl chloride threading pipe. ADVANTAGE - The method enables to prepare graphene-modified flame-retardant polyvinyl chloride threading pipe which has good flame retarding effect, high tensile strength and other mechanical properties, and it is an excellent flame-retardant. DETAILED DESCRIPTION - The stirring rate is controlled at 500-1000 revolution per minute, stirred for 60-120 minutes, then dried and ground to a fine powder to obtain surface-treated oxidized hydroxide. The mass ratio of silane coupling agent, water and magnesium hydroxide is 1:5:30. The graphene composite flame retardant synergist of surface treated magnesium hydroxide of 60-90 degrees C is mixed, and then with polyvinyl chloride, heat stabilizers, fillers lubricant mixing, melt blending, extrusion molding, cooling and setting to obtain a graphene-modified flame-retardant polyvinyl chloride threading pipe, where 10-20 pts. wt. graphene composite flame retardant synergist, 5-10 pts. wt. treated magnesium hydroxide, 60-80 pts. wt. polyvinyl chloride, 5-8 pts. wt. heat stabilizer, 10-30 pts. wt. filler and 2-8 pts. wt. lubricant.