METHOD FOR REMOVING RESIDUAL SOLVENT FROM LAYERS BASED ON CARBON NANOTUBES Russian patent published in 2021 - IPC B01D12/00 B82Y40/00 C01B32/17 C01B32/158 

FIELD: industrial chemistry.

SUBSTANCE: invention relates to a method for removing residual solvent from a layer based on carbon nanotubes obtained by applying dispersions of carbon nanotubes in an organic solvent or a mixture of solvents, one of which is a derivative of γ-lactam, namely N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-octyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, N-butyl-2-pyrrolidone, N-benzyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-dodecyl-pyrrolidone, or a cyclic urea derivative, namely N, N-dimethylpropylene urea, 1,3-dimethyl-2-imidazolidinone, or dimethylformamide, or N,N-dimethylacetamide, or dimethylsulfoxide. The method is characterized in that the layers are washed by keeping them in a washing liquid from at least 0.1 minutes to not more than 10 minutes, and then in water, where the following concentrated carboxylic acids or a mixture thereof are used as the washing liquid: formic acid, acetic acid, propionic acid, lactic acid, acrylic acid, oxalic acid, malonic acid, glutaric acid, or aqueous solutions of these acids or their mixtures with a concentration of not less than 0.5 M, and the holding time in the washing liquid, which is an aqueous solution of these acids or mixtures thereof, is in the range from not less than 3 minutes to not more than 10 minutes.

EFFECT: technical result of the invention is the removal of the solvent from the layers based on carbon nanotubes, providing, in the case of conducting layers, a decrease in electrical resistance by improving the electrical contact between carbon nanotubes.

2 cl, 2 ex, 4 dwg