▎ 摘　　要

NOVELTY - A high-concentration nano-color paste comprises color paste, dispersant and polyamide 6 (PA6) fiber in-situ polymerized graphene. The PA6 fiber in-situ polymerized graphene is prepared by (i) dispersing graphene oxide into toluene solvent, adding toluene diisocyanate, heating and reacting in a nitrogen atmosphere to obtain isocyanate-modified graphene, (ii) dispersing the isocyanate-modified graphene into solvent, dripping aminoisophthalic acid and stannous octoate, stirring and reacting in nitrogen atmosphere, reacting, centrifugally separating, and washing the product with acetone to obtain benzoic acid-modified graphene, (iii) ultrasonically mixing benzoic acid-modified graphene and caprolactam, adding aminocaproic acid, carrying out in-situ polymerization in the nitrogen atmosphere, reacting, cooling, adding distilled water to precipitate, filtering solvent, washing the product with distilled water and ethanol, melt-spinning, stretching, and heat-setting USE - High-concentration nano-color paste for in-situ polymerization of polyamide 6 used in textile fiber, clothes, fishing net screen and cable. ADVANTAGE - The nano-color paste enhances the tensile strength and Young's modulus of PA6 fiber. DETAILED DESCRIPTION - A high-concentration nano-color paste comprises color paste, dispersant and polyamide 6 (PA6) fiber in-situ polymerized graphene. The PA6 fiber in-situ polymerized graphene is prepared by (i) dispersing graphene oxide into toluene solvent, adding toluene diisocyanate, heating and reacting in a nitrogen atmosphere to obtain isocyanate-modified graphene, (ii) dispersing the isocyanate-modified graphene into a solvent, dripping aminoisophthalic acid and stannous octoate, stirring and reacting in nitrogen atmosphere, reacting, centrifugally separating, and washing the product with acetone to obtain benzoic acid-modified graphene, (iii) ultrasonically mixing benzoic acid-modified graphene and caprolactam, adding aminocaproic acid, carrying out in-situ polymerization in the nitrogen atmosphere, reacting, cooling, adding distilled water to precipitate, filtering solvent, washing the product with distilled water and ethanol, melt-spinning at 250-260°C, stretching, and heat-setting to obtain PA6 fiber in-situ polymerized graphene, and (iv) adding pigment, dispersant and N,N-dimethyl formamide solvent into a mixing tank, dispersing at high speed for 60-120 minutes, passing through pipeline high-speed cutting device, dispersing, mixing uniformly, entering the sand mill for circular grinding, controlling the grain diameter after grinding to 500-800 nm, homogenizing at 320-400 L/hour in a high-pressure homogenizer at 400-500 bar, processing for 2-5 hours at 40-60°C, melting and blending the obtained color paste and PA6 fiber-grafted graphite in a twin-screw extruder for coloring to obtain PA6-fiber in-situ polymerized graphene colored by the color paste.