Example 1

30 parts of (A) an amino-modified silicone (Si-1), 5 parts of (B) the nonionic surfactant (N-4), and 65 parts of ion-exchanged water were stirred well, and then emulsified using a homogenizer, to prepare an aqueous liquid of a carbon fiber precursor treatment agent having a solid concentration of 35% in Example 1.

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