Phosphorus-based flame retardant modified carbon nanotube and preparation method and application thereof

The invention discloses a phosphorus-based flame retardant modified carbon nanotube as well as a preparation method and application thereof. The preparation method of the phosphorus flame retardant modified carbon nanotube comprises the following steps: 1) preparing a carboxylated carbon nanotube; (2) preparing a vinylated carbon nano tube; 3) preparing an amino modified phosphorus flame retardant; and 4) dispersing the vinylated carbon nanotube, the amino-modified phosphorus flame retardant and a catalyst in a solvent for reflux reaction, and then separating and purifying the product to obtain the phosphorus flame retardant modified carbon nanotube. The phosphorus-based flame retardant modified carbon nanotube has the advantages of excellent flame retardance, good heat conduction effect, good stability, high mechanical strength and the like, the preparation method is relatively simple, the production cost is relatively low, and the phosphorus-based flame retardant modified carbon nanotube can be used in the