▎ 摘　　要

NOVELTY - Preparing functional graphene-polyvinyl chloride cable material with high thermal stability comprises (i) adding 100 pts. wt. 1,4,5,8-naphthalene tetracarboxylic dianhydride, 120-170 pts. wt. phenylglycine methyl ester in N,N-dimethylformamide, introducing nitrogen to discharge air, adding product into potassium hydroxide solution, and obtaining diacetoxynaphthalimide, (ii) adding diacetoxynaphthalimide, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide in toluene solvent, adding 2-aminoethyl methacrylate hydrochloride and obtaining bisacryloyloxyacetamidonaphthalimide, (iii) using mercaptoethylamine to carry out surface modification to graphene oxide to obtain mercapto graphene, adding mercapto graphene and bisacryloyloxyacetamidonaphthalimide in toluene solvent, and (iv) mixing polyvinyl chloride, acryloyloxyacetamido naphthalimide graphene, dicumyl peroxide, plasticizing agent and stabilizing agent, plasticating, and hot-pressing USE - The method is useful for preparing functional graphene-polyvinyl chloride cable material with high thermal stability. ADVANTAGE - The material: chemically modifies rigid naphthalimide rings and polymerizable acryloxy groups on the graphene surface; initiates acryloxy groups on graphene surface are initiated by dicumyl peroxide; enhances the compatibility and interfacial force between graphene and polyvinyl chloride; improves the agglomeration problem of graphene; has better reinforcing effect on polyvinyl chloride cable materials; hinders the movement of polyvinyl chloride molecular chains by rigid naphthalimide chemical crosslinking network between the two blocks; and has improved thermal decomposition temperature, thermal stability and mechanical strength. DETAILED DESCRIPTION - Preparing functional graphene-polyvinyl chloride cable material with high thermal stability comprises (i) adding 100 pts. wt. 1,4,5,8-naphthalene tetracarboxylic dianhydride, 120-170 pts. wt. phenylglycine methyl ester in N,N-dimethylformamide, introducing nitrogen to discharge air, reacting at room temperature for 2-4 hours, heating to 120-140℃ for thermal imidization treatment for 12-24 hours, adding the product into the potassium hydroxide solution, and stirring at 40-60℃ for 3-8 hours to obtain diacetoxynaphthalimide, (ii) adding diacetoxynaphthalimide, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide in toluene solvent, stirring and activating at room temperature for 1-3 hours, adding 2-aminoethyl methacrylate hydrochloride and reacting at 35-60℃ for 6-18 hours to obtain bis acryloyloxy acetamidonaphthalimide, (iii) using mercaptoethylamine to carry out surface modification to graphene oxide to obtain mercapto graphene, adding mercapto graphene and bisacryloyloxyacetamidonaphthalimide in the toluene solvent, uniformly stirring, dripping triethylamine, heating to 60-90℃ and refluxing for 12-24 hours to prepare acryloyloxyacetamido naphthalimide graphene, and (iv) uniformly mixing polyvinyl chloride, acryloyloxyacetamido naphthalimide graphene, 0.03-0.2 pts. wt. dicumyl peroxide, 40-50 pts. wt. plasticizing agent and 2-3 pts. wt. stabilizing agent, placing the material in a double-roller plastic mixer, plasticating at 170-180℃ for 15-30 minutes, placing the material in a flat vulcanizing machine, and hot-pressing at 175-185℃ under a pressure of 10-15 MPa to obtain the finished product.