PRODUCTION METHOD OF CARBON NANOTUBE DISPERSION

To provide a production method of a carbon nanotube dispersion, with which a carbon nanotube dispersion with a desired characteristic can be produced with high accuracy.SOLUTION: A production method of a carbon nanotube dispersion includes an oxidation treatment step to heat a liquid to be treated containing an oxidizing agent and carbon nanotubes by using a heater. In the production method of the carbon nanotube dispersion, time to turn off the heater is determined based on a value of a product M*ΔT*tr, in which a mass or volume value of the liquid to be treated is set to be M, a rate of temperature rise of the liquid to be treated from time to turn on the heater to arrival time of temperature of the liquid to be treated to treatment temperature is set to be ΔT, and a treatment time period from arrival time of temperature of the liquid to be treated to treatment temperature to time to turn off of the heater is set to be tr.SELECTED DRAWING: Figure 3 【課題】所望の特性を有するカーボンナノチューブ分散液を精度良く製造し得るカーボンナノチューブ分散液の製造方法を提供する。【解決手段】ヒーターを用いて、酸化剤およびカーボンナノチューブを含む被処理液を加熱する酸化処理工程を含むカーボンナノチューブ分散液の製造方法であって、前記被処理液の質量または体積の値をＭとし、前記ヒーターをオンにした時点から、前記被処理液の温度が処理温度に達した時点までの前記被処理液の昇温速度をΔＴとし、前記被処理液の温度が処理温度に達した時点から、前記ヒーターをオフにする時点までの処理時間をｔｒとしたときの積Ｍ・ΔＴ・ｔｒの値に基づいて、前記ヒーターをオフにする時点を決定する、カーボンナノチューブ分散液の製造方法。【選択図】図３