The invention provides a hydrophobic modified
isocyanate curing agent and a preparation method and application thereof.The preparation method comprises the steps that 1, polyisocyanate and an organic
tin catalyst are mixed, stirred and heated to 45-55 DEG C, a sealing agent is dropwise added under the
inert atmosphere, after dropwise adding is completed, a reaction is conducted for 3-5 h at the temperature of 45-55 DEG C, and an
isocyanate semi-sealed substance is obtained; (2) mixing hydroxyl polysiloxane,
alkylphenol glycidyl ether and a
solvent, heating to 100-120 DEG C in an
inert atmosphere, adding
triphenylphosphine, heating to 145 DEG C, and reacting for 1-3 hours to obtain a hydrophobic
polyol modifier; and (3) adding the
isocyanate semi-sealing substance into a reaction kettle filled with
inert atmosphere, heating to 40-60 DEG C, dripping the hydrophobic
polyol modifier, heating to 70-85 DEG C after dripping, keeping the temperature for 1-3 hours, dripping a sealing agent, and reacting at 80-85 DEG C for 2 hours to obtain the hydrophobic modified isocyanate curing agent. A simple, convenient and effective way is provided for preparing the hydrophobic
electrophoresis emulsion.